ogl_beamforming

ui.c (149530B)

---

 /* See LICENSE for license details. */
 /* TODO(rnp):
  * [ ]: bug: draw_view_ruler() needs to use a ray intersection instead of clamping
  * [ ]: bug: plane rotation and offset position only work if plane is Z aligned
  * [ ]: refactor: ui and views need to store current uv coordinates for expected transform
  * [ ]: refactor: there shouldn't need to be if 1d checks all over
  * [ ]: refactor: ui kind of needs to be mostly thrown away
  *      - want all drawing to be immediate mode
  *      - only layout information should be retained
  *        - leaf nodes of layout have a kind associated which
  *          instructs the builder code on how to build the view
  *      - ui items (currently called Variables) are stored in a hash
  *        table and are looked up for state information at frame building time
  *        - removed/recycled when last building frame index is less than drawing frame index
  *      - building:
  *        - loop over tiled layout tree and floating layout tree as is currently done
  *          - this will build current frame ui draw tree
  *        - for each view use a stack structure with grouping, similar to how tables are made
  *          - more general though: sub groups contain a draw axis (x or y)
  *        - each ui item gets looked up in the hash table for previous frame drawing info
  *          - this can then be used to construct a "ui comm" which contains relevant info
  *            about how that ui item is being interacted with
  *      - drawing:
  *        - must be separated into layout constraint solving and rendering
  *        - layout constraint solving handles sizing, clipping, etc.
  *          - this will need multiple passes per subgroup to allow for autosizing
  *          - pay attention to the fixed size points in the hierarchy. fixed size
  *            items are complete once their children are complete.
  *        - rendering simply uses the rect/clipping regions produced by layout
  *          to send draw commands
  * [ ]: bug: resizing live view causes texture to jump around
  * [ ]: bug: group at end of parameter listing
  * [ ]: refactor: ui should be in its own thread and that thread should only be concerned with the ui
  * [ ]: refactor: remove all the excessive measure_texts (cell drawing, hover_interaction in params table)
  * [ ]: refactor: move remaining fragment shader stuff into ui
  * [ ]: refactor: scale table to rect
  * [ ]: scroll bar for views that don't have enough space
  * [ ]: allow views to collapse to just their title bar
  *      - title bar struct with expanded. Check when pushing onto draw stack; if expanded
  *        do normal behaviour else make size title bar size and ignore the splits fraction.
  * [ ]: enforce a minimum region size or allow regions themselves to scroll
  * [ ]: refactor: add_variable_no_link()
  * [ ]: refactor: draw_text_limited should clamp to rect and measure text itself
  * [ ]: draw the ui with a post-order traversal instead of pre-order traversal
  * [ ]: consider V_HOVER_GROUP and use that to implement submenus
  * [ ]: menu's need to support nested groups
  * [ ]: don't redraw on every refresh; instead redraw on mouse movement/event or when a new frame
  *      arrives. For animations the ui can have a list of "timers" which while active will
  *      do a redraw on every refresh until completed.
  * [ ]: show full non-truncated string on hover
  * [ ]: refactor: hovered element type and show hovered element in full even when truncated
  * [ ]: bug: cross-plane view with different dimensions for each plane
  * [ ]: refactor: make table_skip_rows useful
  * [ ]: refactor: better method of grouping variables for views such as FrameView/ComputeStatsView
  */
 
 #include "assets/generated/assets.c"
 
 #define BG_COLOUR              (v4){{0.15f, 0.12f, 0.13f, 1.0f}}
 #define FG_COLOUR              (v4){{0.92f, 0.88f, 0.78f, 1.0f}}
 #define FOCUSED_COLOUR         (v4){{0.86f, 0.28f, 0.21f, 1.0f}}
 #define HOVERED_COLOUR         (v4){{0.11f, 0.50f, 0.59f, 1.0f}}
 #define RULER_COLOUR           (v4){{1.00f, 0.70f, 0.00f, 1.0f}}
 #define BORDER_COLOUR          v4_lerp(FG_COLOUR, BG_COLOUR, 0.85f)
 
 #define FRAME_VIEW_BB_COLOUR          (v4){{0.92f, 0.88f, 0.78f, 1.0f}}
 #define FRAME_VIEW_BB_FRACTION        0.007f
 #define FRAME_VIEW_RENDER_TARGET_SIZE 1024, 1024
 
 #define MENU_PLUS_COLOUR       (v4){{0.33f, 0.42f, 1.00f, 1.00f}}
 #define MENU_CLOSE_COLOUR      FOCUSED_COLOUR
 
 read_only global v4 g_colour_palette[] = {
 	{{0.32f, 0.20f, 0.50f, 1.00f}},
 	{{0.14f, 0.39f, 0.61f, 1.00f}},
 	{{0.61f, 0.14f, 0.25f, 1.00f}},
 	{{0.20f, 0.60f, 0.24f, 1.00f}},
 	{{0.80f, 0.60f, 0.20f, 1.00f}},
 	{{0.15f, 0.51f, 0.74f, 1.00f}},
 };
 
 #define HOVER_SPEED            5.0f
 #define BLINK_SPEED            1.5f
 
 #define TABLE_CELL_PAD_HEIGHT  2.0f
 #define TABLE_CELL_PAD_WIDTH   8.0f
 
 #define RULER_TEXT_PAD         10.0f
 #define RULER_TICK_LENGTH      20.0f
 
 #define UI_SPLIT_HANDLE_THICK  8.0f
 #define UI_REGION_PAD          32.0f
 
 /* TODO(rnp) smooth scroll */
 #define UI_SCROLL_SPEED 12.0f
 
 #define LISTING_LINE_PAD    6.0f
 #define TITLE_BAR_PAD       6.0f
 
 typedef struct v2_sll {
 	struct v2_sll *next;
 	v2             v;
 } v2_sll;
 
 typedef struct {
 	f32 t;
 	f32 scale;
 } UIBlinker;
 
 typedef struct BeamformerUI BeamformerUI;
 typedef struct Variable     Variable;
 
 typedef struct {
 	u8   buf[128];
 	i32  count;
 	i32  cursor;
 	b32  numeric;
 	UIBlinker cursor_blink;
 	Font *font, *hot_font;
 	Variable *container;
 } InputState;
 
 typedef enum {
 	RulerState_None,
 	RulerState_Start,
 	RulerState_Hold,
 } RulerState;
 
 typedef struct {
 	v3 start;
 	v3 end;
 	RulerState state;
 } Ruler;
 
 typedef enum {
 	SB_LATERAL,
 	SB_AXIAL,
 } ScaleBarDirection;
 
 typedef struct {
 	f32    *min_value, *max_value;
 	v2_sll *savepoint_stack;
 	v2      scroll_scale;
 	f32     zoom_starting_coord;
 	ScaleBarDirection direction;
 } ScaleBar;
 
 typedef struct { f32 val, scale; } scaled_f32;
 
 typedef enum {
 	RSD_VERTICAL,
 	RSD_HORIZONTAL,
 } RegionSplitDirection;
 
 typedef struct {
 	Variable *left;
 	Variable *right;
 	f32       fraction;
 	RegionSplitDirection direction;
 } RegionSplit;
 
 #define COMPUTE_STATS_VIEW_LIST \
 	X(Average, "Average") \
 	X(Bar,     "Bar")
 
 #define X(kind, ...) ComputeStatsViewKind_ ##kind,
 typedef enum {COMPUTE_STATS_VIEW_LIST ComputeStatsViewKind_Count} ComputeStatsViewKind;
 #undef X
 
 typedef struct {
 	ComputeShaderStats *compute_shader_stats;
 	Variable           *cycler;
 	ComputeStatsViewKind kind;
 	UIBlinker blink;
 } ComputeStatsView;
 
 typedef struct {
 	b32 *processing;
 	f32 *progress;
 	f32 display_t;
 	f32 display_t_velocity;
 } ComputeProgressBar;
 
 typedef enum {
 	VT_NULL,
 	VT_B32,
 	VT_F32,
 	VT_I32,
 	VT_U32,
 	VT_GROUP,
 	VT_CYCLER,
 	VT_SCALED_F32,
 	VT_BEAMFORMER_VARIABLE,
 	VT_BEAMFORMER_FRAME_VIEW,
 	VT_COMPUTE_STATS_VIEW,
 	VT_COMPUTE_PROGRESS_BAR,
 	VT_LIVE_CONTROLS_VIEW,
 	VT_LIVE_CONTROLS_STRING,
 	VT_SCALE_BAR,
 	VT_UI_BUTTON,
 	VT_UI_MENU,
 	VT_UI_REGION_SPLIT,
 	VT_UI_TEXT_BOX,
 	VT_UI_VIEW,
 	VT_X_PLANE_SHIFT,
 } VariableType;
 
 typedef enum {
 	VariableGroupKind_List,
 	/* NOTE(rnp): special group for vectors with components
 	 * stored in separate memory locations */
 	VariableGroupKind_Vector,
 } VariableGroupKind;
 
 typedef struct {
 	VariableGroupKind kind;
 	b32       expanded;
 	Variable *first;
 	Variable *last;
 	Variable *container;
 } VariableGroup;
 
 typedef enum {
 	UIViewFlag_CustomText = 1 << 0,
 	UIViewFlag_Floating   = 1 << 1,
 } UIViewFlags;
 
 typedef struct {
 	Variable *child;
 	Variable *close;
 	Variable *menu;
 	Rect      rect;
 	UIViewFlags flags;
 } UIView;
 
 /* X(id, text) */
 #define FRAME_VIEW_BUTTONS \
 	X(FV_COPY_HORIZONTAL, "Copy Horizontal") \
 	X(FV_COPY_VERTICAL,   "Copy Vertical")
 
 #define GLOBAL_MENU_BUTTONS \
 	X(GM_OPEN_VIEW_RIGHT,   "Open View Right") \
 	X(GM_OPEN_VIEW_BELOW,   "Open View Below")
 
 #define X(id, text) UI_BID_ ##id,
 typedef enum {
 	UI_BID_VIEW_CLOSE,
 	GLOBAL_MENU_BUTTONS
 	FRAME_VIEW_BUTTONS
 } UIButtonID;
 #undef X
 
 typedef struct {
 	s8  *labels;
 	u32 *state;
 	u32  cycle_length;
 } VariableCycler;
 
 typedef struct {
 	s8  suffix;
 	f32 display_scale;
 	f32 scroll_scale;
 	v2  limits;
 	f32 *store;
 } BeamformerVariable;
 
 typedef struct {
 	v3 start_point;
 	v3 end_point;
 } XPlaneShift;
 
 typedef enum {
 	V_INPUT          = 1 << 0,
 	V_TEXT           = 1 << 1,
 	V_RADIO_BUTTON   = 1 << 2,
 	V_EXTRA_ACTION   = 1 << 3,
 	V_HIDES_CURSOR   = 1 << 4,
 	V_LIVE_CONTROL   = 1 << 28,
 	V_CAUSES_COMPUTE = 1 << 29,
 	V_UPDATE_VIEW    = 1 << 30,
 } VariableFlags;
 
 struct Variable {
 	s8 name;
 	union {
 		void               *generic;
 		BeamformerVariable  beamformer_variable;
 		ComputeProgressBar  compute_progress_bar;
 		ComputeStatsView    compute_stats_view;
 		RegionSplit         region_split;
 		ScaleBar            scale_bar;
 		UIButtonID          button;
 		UIView              view;
 		VariableCycler      cycler;
 		VariableGroup       group;
 		XPlaneShift         x_plane_shift;
 		scaled_f32          scaled_real32;
 		b32                 bool32;
 		i32                 signed32;
 		u32                 unsigned32;
 		f32                 real32;
 	};
 	Variable *next;
 	Variable *parent;
 	VariableFlags flags;
 	VariableType  type;
 
 	f32 hover_t;
 	f32 name_width;
 };
 
 #define BEAMFORMER_FRAME_VIEW_KIND_LIST \
 	X(Latest,   "Latest")     \
 	X(3DXPlane, "3D X-Plane") \
 	X(Copy,     "Copy")       \
 
 typedef enum {
 	#define X(kind, ...) BeamformerFrameViewKind_##kind,
 	BEAMFORMER_FRAME_VIEW_KIND_LIST
 	#undef X
 	BeamformerFrameViewKind_Count,
 } BeamformerFrameViewKind;
 
 typedef struct BeamformerFrameView BeamformerFrameView;
 struct BeamformerFrameView {
 	BeamformerFrameViewKind kind;
 	b32 dirty;
 	BeamformerFrameView *prev, *next;
 
 	// NOTE(rnp): for FrameViewKindCopy
 	GPUBuffer copy_buffer;
 
 	GPUImage colour_image;
 	// NOTE(rnp): temporary, on w32 we must hold onto this when importing vulkan data to OpenGL
 	OSHandle export_handle;
 	u32      memory_object;
 	u32      texture;
 
 	/* NOTE(rnp): any pointers to variables are added to the menu and will
 	 * be put onto the freelist if the view is closed. */
 
 	Variable *kind_cycler;
 	Variable *log_scale;
 	Variable threshold;
 	Variable dynamic_range;
 	Variable gamma;
 
 	union {
 		/* BeamformerFrameViewKind_Latest/BeamformerFrameViewKind_Copy */
 		struct {
 			Variable lateral_scale_bar;
 			Variable axial_scale_bar;
 			Variable *lateral_scale_bar_active;
 			Variable *axial_scale_bar_active;
 			/* NOTE(rnp): selects which plane to use */
 			Variable *cycler;
 			u32 cycler_state;
 
 			Ruler ruler;
 
 			v3 min_coordinate;
 			v3 max_coordinate;
 
 			BeamformerFrame frame;
 		};
 
 		/* BeamformerFrameViewKind_3DXPlane */
 		struct {
 			Variable x_plane_shifts[2];
 			Variable *demo;
 			f32 rotation;
 			v3  hit_test_point;
 		};
 	};
 };
 
 typedef struct BeamformerLiveControlsView BeamformerLiveControlsView;
 struct BeamformerLiveControlsView {
 	Variable transmit_power;
 	Variable tgc_control_points[countof(((BeamformerLiveImagingParameters *)0)->tgc_control_points)];
 	Variable save_button;
 	Variable stop_button;
 	Variable save_text;
 	UIBlinker save_button_blink;
 	u32      hot_field_flag;
 	u32      active_field_flag;
 };
 
 typedef enum {
 	InteractionKind_None,
 	InteractionKind_Nop,
 	InteractionKind_Auto,
 	InteractionKind_Button,
 	InteractionKind_Drag,
 	InteractionKind_Menu,
 	InteractionKind_Ruler,
 	InteractionKind_Scroll,
 	InteractionKind_Set,
 	InteractionKind_Text,
 } InteractionKind;
 
 typedef struct {
 	InteractionKind kind;
 	union {
 		void     *generic;
 		Variable *var;
 	};
 	Rect rect;
 } Interaction;
 
 #define auto_interaction(r, v) (Interaction){.kind = InteractionKind_Auto, .var = v, .rect = r}
 
 struct BeamformerUI {
 	Arena arena;
 
 	Font font;
 	Font small_font;
 
 	v2   last_mouse;
 
 	Variable *regions;
 	Variable *variable_freelist;
 
 	Variable floating_widget_sentinal;
 
 	BeamformerFrameView *view_first;
 	BeamformerFrameView *view_last;
 	BeamformerFrameView *view_freelist;
 
 	Interaction interaction;
 	Interaction hot_interaction;
 	Interaction next_interaction;
 
 	InputState  text_input_state;
 
 	VulkanHandle    pipelines[BeamformerShaderKind_RenderCount];
 
 	OSHandle        render_semaphores_export[2];
 	VulkanHandle    render_semaphores[2];
 	u32             render_semaphores_gl[2];
 
 	GPUImage        render_3d_image;
 	GPUImage        render_3d_depth_image;
 	RenderModel     unit_cube_model;
 
 	v2_sll *scale_bar_savepoint_freelist;
 
 	BeamformerFrame latest_plane[BeamformerViewPlaneTag_Count + 1];
 	b32             latest_plane_valid[BeamformerViewPlaneTag_Count + 1];
 
 	BeamformerUIParameters params;
 	b32                    flush_params;
 	u32 selected_parameter_block;
 
 	v2  min_coordinate;
 	v2  max_coordinate;
 	f32 off_axis_position;
 	f32 beamform_plane;
 
 	BeamformerSharedMemory * shared_memory;
 	BeamformerCtx *          beamformer_context;
 };
 
 typedef enum {
 	TF_NONE     = 0,
 	TF_ROTATED  = 1 << 0,
 	TF_LIMITED  = 1 << 1,
 	TF_OUTLINED = 1 << 2,
 } TextFlags;
 
 typedef enum {
 	TextAlignment_Center,
 	TextAlignment_Left,
 	TextAlignment_Right,
 } TextAlignment;
 
 typedef struct {
 	Font  *font;
 	Rect  limits;
 	v4    colour;
 	v4    outline_colour;
 	f32   outline_thick;
 	f32   rotation;
 	TextAlignment align;
 	TextFlags     flags;
 } TextSpec;
 
 typedef enum {
 	TRK_CELLS,
 	TRK_TABLE,
 } TableRowKind;
 
 typedef enum {
 	TableCellKind_None,
 	TableCellKind_Variable,
 	TableCellKind_VariableGroup,
 } TableCellKind;
 
 typedef struct {
 	s8 text;
 	union {
 		i64       integer;
 		Variable *var;
 		void     *generic;
 	};
 	TableCellKind kind;
 	f32 width;
 } TableCell;
 
 typedef struct {
 	void         *data;
 	TableRowKind  kind;
 } TableRow;
 
 typedef struct Table {
 	TableRow *data;
 	da_count  count;
 	da_count  capacity;
 
 	/* NOTE(rnp): counted by columns */
 	TextAlignment *alignment;
 	f32           *widths;
 
 	v4  border_colour;
 	f32 column_border_thick;
 	f32 row_border_thick;
 	v2  size;
 	v2  cell_pad;
 
 	/* NOTE(rnp): row count including nested tables */
 	i32 rows;
 	i32 columns;
 
 	struct Table *parent;
 } Table;
 
 typedef struct {
 	Table *table;
 	i32    row_index;
 } TableStackFrame;
 
 typedef struct {
 	TableStackFrame *data;
 	da_count         count;
 	da_count         capacity;
 } TableStack;
 
 typedef enum {
 	TIK_ROWS,
 	TIK_CELLS,
 } TableIteratorKind;
 
 typedef struct {
 	TableStack      stack;
 	TableStackFrame frame;
 
 	TableRow *row;
 	i16       column;
 	i16       sub_table_depth;
 
 	TableIteratorKind kind;
 
 	f32           start_x;
 	TextAlignment alignment;
 	Rect          cell_rect;
 } TableIterator;
 
 function Vector2
 rl_v2(v2 a)
 {
 	Vector2 result = {a.x, a.y};
 	return result;
 }
 
 function Rectangle
 rl_rect(Rect a)
 {
 	Rectangle result = {a.pos.x, a.pos.y, a.size.w, a.size.h};
 	return result;
 }
 
 function BeamformerViewPlaneTag
 ui_plane_layout_from_normal(v3 normal)
 {
 	BeamformerViewPlaneTag result = BeamformerViewPlaneTag_Arbitrary;
 	b32 has_x = !f32_equal(normal.x, 0.0f);
 	b32 has_y = !f32_equal(normal.y, 0.0f);
 	b32 has_z = !f32_equal(normal.z, 0.0f);
 	if ((has_x + has_y + has_z) == 1) {
 		if (has_x) result = BeamformerViewPlaneTag_YZ;
 		if (has_y) result = BeamformerViewPlaneTag_XZ;
 		if (has_z) result = BeamformerViewPlaneTag_XY;
 		assert(result != BeamformerViewPlaneTag_Arbitrary);
 	}
 	return result;
 }
 
 function f32
 ui_blinker_update(UIBlinker *b, f32 scale)
 {
 	b->t += b->scale * dt_for_frame;
 	if (b->t >= 1.0f) b->scale = -scale;
 	if (b->t <= 0.0f) b->scale =  scale;
 	f32 result = b->t;
 	return result;
 }
 
 function v2
 measure_glyph(Font font, u32 glyph)
 {
 	assert(glyph >= 0x20);
 	v2 result = {.y = (f32)font.baseSize};
 	/* NOTE: assumes font glyphs are ordered ASCII */
 	result.x = (f32)font.glyphs[glyph - 0x20].advanceX;
 	if (result.x == 0)
 		result.x = (font.recs[glyph - 0x20].width + (f32)font.glyphs[glyph - 0x20].offsetX);
 	return result;
 }
 
 function v2
 measure_text(Font font, s8 text)
 {
 	v2 result = {.y = (f32)font.baseSize};
 	for (iz i = 0; i < text.len; i++)
 		result.x += measure_glyph(font, text.data[i]).x;
 	return result;
 }
 
 function s8
 clamp_text_to_width(Font font, s8 text, f32 limit)
 {
 	s8  result = text;
 	f32 width  = 0;
 	for (iz i = 0; i < text.len; i++) {
 		f32 next = measure_glyph(font, text.data[i]).w;
 		if (width + next > limit) {
 			result.len = i;
 			break;
 		}
 		width += next;
 	}
 	return result;
 }
 
 function v2
 align_text_in_rect(s8 text, Rect r, Font font)
 {
 	v2 size   = measure_text(font, text);
 	v2 pos    = v2_add(r.pos, v2_scale(v2_sub(r.size, size), 0.5));
 	v2 result = clamp_v2_rect(pos, r);
 	return result;
 }
 
 function Texture
 make_raylib_texture(BeamformerFrameView *v)
 {
 	Texture result;
 	result.id      = v->texture;
 	result.width   = v->colour_image.width;
 	result.height  = v->colour_image.height;
 	result.mipmaps = v->colour_image.mip_map_levels;
 	result.format  = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
 	return result;
 }
 
 function void
 stream_append_variable(Stream *s, Variable *var)
 {
 	switch (var->type) {
 	case VT_UI_BUTTON:
 	case VT_GROUP:{ stream_append_s8(s, var->name); }break;
 	case VT_F32:{   stream_append_f64(s, var->real32, 100); }break;
 	case VT_B32:{   stream_append_s8(s, var->bool32 ? s8("True") : s8("False")); }break;
 	case VT_SCALED_F32:{ stream_append_f64(s, var->scaled_real32.val, 100); }break;
 	case VT_BEAMFORMER_VARIABLE:{
 		BeamformerVariable *bv = &var->beamformer_variable;
 		stream_append_f64(s, *bv->store * bv->display_scale, 100);
 	}break;
 	case VT_CYCLER:{
 		u32 index = *var->cycler.state;
 		if (var->cycler.labels) stream_append_s8(s, var->cycler.labels[index]);
 		else                    stream_append_u64(s, index);
 	}break;
 	case VT_LIVE_CONTROLS_STRING:{
 		BeamformerLiveImagingParameters *lip = var->generic;
 		stream_append_s8(s, (s8){.data = (u8 *)lip->save_name_tag, .len = lip->save_name_tag_length});
 		if (lip->save_name_tag_length <= 0) stream_append_s8(s, s8("Tag..."));
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function void
 stream_append_variable_group(Stream *s, Variable *var)
 {
 	switch (var->type) {
 	case VT_GROUP:{
 		switch (var->group.kind) {
 		case VariableGroupKind_Vector:{
 			Variable *v = var->group.first;
 			stream_append_s8(s, s8("{"));
 			while (v) {
 				stream_append_variable(s, v);
 				v = v->next;
 				if (v) stream_append_s8(s, s8(", "));
 			}
 			stream_append_s8(s, s8("}"));
 		}break;
 		InvalidDefaultCase;
 		}
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function s8
 push_acquisition_kind(Stream *s, BeamformerAcquisitionKind kind, u32 transmit_count)
 {
 	s8 name             = beamformer_acquisition_kind_strings[kind];
 	b32 fixed_transmits = beamformer_acquisition_kind_has_fixed_transmits[kind];
 	if (kind >= BeamformerAcquisitionKind_Count || kind < 0) {
 		fixed_transmits = 0;
 		name            = s8("Invalid");
 	}
 
 	stream_append_s8(s, name);
 	if (!fixed_transmits) {
 		stream_append_byte(s, '-');
 		stream_append_u64(s, transmit_count);
 	}
 
 	return stream_to_s8(s);
 }
 
 function s8
 push_custom_view_title(Stream *s, Variable *var)
 {
 	switch (var->type) {
 	case VT_COMPUTE_STATS_VIEW:{
 		stream_append_s8(s, s8("Compute Stats: "));
 		stream_append_variable(s, var->compute_stats_view.cycler);
 	}break;
 	case VT_COMPUTE_PROGRESS_BAR:{
 		stream_append_s8(s, s8("Compute Progress: "));
 		stream_append_f64(s, 100 * *var->compute_progress_bar.progress, 100);
 		stream_append_byte(s, '%');
 	} break;
 	case VT_BEAMFORMER_FRAME_VIEW:{
 		BeamformerFrameView *bv = var->generic;
 		stream_append_s8(s, s8("Frame View"));
 		switch (bv->kind) {
 		case BeamformerFrameViewKind_Copy:{ stream_append_s8(s, s8(": Copy [")); }break;
 		case BeamformerFrameViewKind_Latest:{
 			#define X(plane, id, pretty) s8_comp(": " pretty " ["),
 			read_only local_persist s8 labels[BeamformerViewPlaneTag_Count + 1] = {
 				BEAMFORMER_VIEW_PLANE_TAG_LIST
 				s8_comp(": Live [")
 			};
 			#undef X
 			stream_append_s8(s, labels[*bv->cycler->cycler.state % (BeamformerViewPlaneTag_Count + 1)]);
 		}break;
 		case BeamformerFrameViewKind_3DXPlane:{ stream_append_s8(s, s8(": 3D X-Plane")); }break;
 		InvalidDefaultCase;
 		}
 		if (bv->kind != BeamformerFrameViewKind_3DXPlane) {
 			stream_append_hex_u64(s, bv->frame.id);
 			stream_append_byte(s, ']');
 		}
 	}break;
 	InvalidDefaultCase;
 	}
 	return stream_to_s8(s);
 }
 
 #define table_new(a, init, ...) table_new_(a, init, arg_list(TextAlignment, ##__VA_ARGS__))
 function Table *
 table_new_(Arena *a, i32 initial_capacity, TextAlignment *alignment, i32 columns)
 {
 	Table *result = push_struct(a, Table);
 	da_reserve(a, result, initial_capacity);
 	result->columns   = columns;
 	result->alignment = push_array(a, TextAlignment, columns);
 	result->widths    = push_array(a, f32, columns);
 	result->cell_pad  = (v2){{TABLE_CELL_PAD_WIDTH, TABLE_CELL_PAD_HEIGHT}};
 	mem_copy(result->alignment, alignment, sizeof(*alignment) * (u32)columns);
 	return result;
 }
 
 function i32
 table_skip_rows(Table *t, f32 draw_height, f32 text_height)
 {
 	i32 max_rows = (i32)(draw_height / (text_height + t->cell_pad.h));
 	i32 result   = t->rows - MIN(t->rows, max_rows);
 	return result;
 }
 
 function TableIterator *
 table_iterator_new(Table *table, TableIteratorKind kind, Arena *a, i32 starting_row, v2 at, Font *font)
 {
 	TableIterator *result    = push_struct(a, TableIterator);
 	result->kind             = kind;
 	result->frame.table      = table;
 	result->frame.row_index  = starting_row;
 	result->start_x          = at.x;
 	result->cell_rect.size.h = (f32)font->baseSize;
 	result->cell_rect.pos    = v2_add(at, v2_scale(table->cell_pad, 0.5f));
 	result->cell_rect.pos.y += (f32)(starting_row - 1) * (result->cell_rect.size.h + table->cell_pad.h + table->row_border_thick);
 	da_reserve(a, &result->stack, 4);
 	return result;
 }
 
 function void *
 table_iterator_next(TableIterator *it, Arena *a)
 {
 	void *result = 0;
 
 	if (!it->row || it->kind == TIK_ROWS) {
 		for (;;) {
 			TableRow *row = it->frame.table->data + it->frame.row_index++;
 			if (it->frame.row_index <= it->frame.table->count) {
 				if (row->kind == TRK_TABLE) {
 					*da_push(a, &it->stack) = it->frame;
 					it->frame = (TableStackFrame){.table = row->data};
 					it->sub_table_depth++;
 				} else {
 					result = row;
 					break;
 				}
 			} else if (it->stack.count) {
 				it->frame = it->stack.data[--it->stack.count];
 				it->sub_table_depth--;
 			} else {
 				break;
 			}
 		}
 		Table *t   = it->frame.table;
 		it->row    = result;
 		it->column = 0;
 		it->cell_rect.pos.x  = it->start_x + t->cell_pad.w / 2 +
 		                       it->cell_rect.size.h * it->sub_table_depth;
 		it->cell_rect.pos.y += it->cell_rect.size.h + t->row_border_thick + t->cell_pad.h;
 	}
 
 	if (it->row && it->kind == TIK_CELLS) {
 		Table *t   = it->frame.table;
 		i32 column = it->column++;
 		it->cell_rect.pos.x  += column > 0 ? it->cell_rect.size.w + t->cell_pad.w : 0;
 		it->cell_rect.size.w  = t->widths[column];
 		it->alignment         = t->alignment[column];
 		result                = (TableCell *)it->row->data + column;
 
 		if (it->column == t->columns)
 			it->row = 0;
 	}
 
 	return result;
 }
 
 function f32
 table_width(Table *t)
 {
 	f32 result = 0;
 	i32 valid  = 0;
 	for (i32 i = 0; i < t->columns; i++) {
 		result += t->widths[i];
 		if (t->widths[i] > 0) valid++;
 	}
 	result += t->cell_pad.w * (f32)valid;
 	result += MAX(0, ((f32)valid - 1)) * t->column_border_thick;
 	return result;
 }
 
 function v2
 table_extent(Table *t, Arena arena, Font *font)
 {
 	TableIterator *it = table_iterator_new(t, TIK_ROWS, &arena, 0, (v2){0}, font);
 	for (TableRow *row = table_iterator_next(it, &arena);
 	     row;
 	     row = table_iterator_next(it, &arena))
 	{
 		for (i32 i = 0; i < it->frame.table->columns; i++) {
 			TableCell *cell = (TableCell *)row->data + i;
 			if (!cell->text.len && cell->var && cell->var->flags & V_RADIO_BUTTON) {
 				cell->width = (f32)font->baseSize;
 			} else {
 				cell->width = measure_text(*font, cell->text).w;
 			}
 			it->frame.table->widths[i] = MAX(cell->width, it->frame.table->widths[i]);
 		}
 	}
 
 	t->size = (v2){.x = table_width(t), .y = it->cell_rect.pos.y - t->cell_pad.h / 2};
 	v2 result = t->size;
 	return result;
 }
 
 function v2
 table_cell_align(TableCell *cell, TextAlignment align, Rect r)
 {
 	v2 result = r.pos;
 	if (r.size.w >= cell->width) {
 		switch (align) {
 		case TextAlignment_Left:{}break;
 		case TextAlignment_Right:{  result.x += (r.size.w - cell->width);     }break;
 		case TextAlignment_Center:{ result.x += (r.size.w - cell->width) / 2; }break;
 		}
 	}
 	return result;
 }
 
 function TableCell
 table_variable_cell(Arena *a, Variable *var)
 {
 	TableCell result = {.var = var, .kind = TableCellKind_Variable};
 	if ((var->flags & V_RADIO_BUTTON) == 0) {
 		Stream text = arena_stream(*a);
 		stream_append_variable(&text, var);
 		result.text = arena_stream_commit(a, &text);
 	}
 	return result;
 }
 
 function TableRow *
 table_push_row(Table *t, Arena *a, TableRowKind kind)
 {
 	TableRow *result = da_push(a, t);
 	if (kind == TRK_CELLS) {
 		result->data = push_array(a, TableCell, t->columns);
 		/* NOTE(rnp): do not increase rows for an empty subtable */
 		t->rows++;
 	}
 	result->kind = kind;
 	return result;
 }
 
 function TableRow *
 table_push_parameter_row(Table *t, Arena *a, s8 label, Variable *var, s8 suffix)
 {
 	assert(t->columns >= 3);
 	TableRow *result = table_push_row(t, a, TRK_CELLS);
 	TableCell *cells = result->data;
 
 	cells[0].text  = label;
 	cells[1]       = table_variable_cell(a, var);
 	cells[2].text  = suffix;
 
 	return result;
 }
 
 #define table_begin_subtable(t, a, ...) table_begin_subtable_(t, a, arg_list(TextAlignment, ##__VA_ARGS__))
 function Table *
 table_begin_subtable_(Table *table, Arena *a, TextAlignment *alignment, i32 columns)
 {
 	TableRow *row = table_push_row(table, a, TRK_TABLE);
 	Table *result = row->data = table_new_(a, 0, alignment, columns);
 	result->parent = table;
 	return result;
 }
 
 function Table *
 table_end_subtable(Table *table)
 {
 	Table *result = table->parent ? table->parent : table;
 	return result;
 }
 
 function void
 resize_frame_view(BeamformerFrameView *view, uv2 dim)
 {
 	if ValidHandle(view->export_handle) os_release_handle(view->export_handle);
 
 	glDeleteMemoryObjectsEXT(1, &view->memory_object);
 	glCreateMemoryObjectsEXT(1, &view->memory_object);
 
 	glDeleteTextures(1, &view->texture);
 	glCreateTextures(GL_TEXTURE_2D, 1, &view->texture);
 
 	/* TODO(rnp): add some ID for the specific view here */
 	s8 label = s8("Frame View Texture");
 	vk_image_allocate(&view->colour_image, dim.w, dim.h, 1, 1, VulkanImageUsage_Colour,
 	                  VulkanUsageFlag_ImageSampling, &view->export_handle, label);
 
 	glMemoryObjectParameterivEXT(view->memory_object, GL_DEDICATED_MEMORY_OBJECT_EXT, (GLint []){1});
 
 	if (OS_WINDOWS) {
 		glImportMemoryWin32HandleEXT(view->memory_object, view->colour_image.memory_size,
 		                             GL_HANDLE_TYPE_OPAQUE_WIN32_EXT, (void *)view->export_handle.value[0]);
 		// NOTE(rnp): w32 does not transfer ownership from handle back to driver
 	} else {
 		glImportMemoryFdEXT(view->memory_object, view->colour_image.memory_size,
 		                    GL_HANDLE_TYPE_OPAQUE_FD_EXT, view->export_handle.value[0]);
 		view->export_handle.value[0] = OSInvalidHandleValue;
 	}
 
 	glTextureStorageMem2DEXT(view->texture, view->colour_image.mip_map_levels, GL_RGBA8,
 	                         view->colour_image.width, view->colour_image.height,
 	                         view->memory_object, 0);
 
 	/* NOTE(rnp): work around raylib's janky texture sampling */
 	v4 border_colour = {{0, 0, 0, 1}};
 	if (view->kind != BeamformerFrameViewKind_Copy) border_colour = (v4){0};
 	glTextureParameteri(view->texture, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
 	glTextureParameteri(view->texture, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
 	glTextureParameterfv(view->texture, GL_TEXTURE_BORDER_COLOR, border_colour.E);
 	/* TODO(rnp): better choice when depth component is included */
 	glTextureParameteri(view->texture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 	glTextureParameteri(view->texture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 
 	glObjectLabel(GL_TEXTURE, view->texture, (i32)label.len, (char *)label.data);
 }
 
 function void
 ui_beamformer_frame_view_release_subresources(BeamformerUI *ui, BeamformerFrameView *bv, BeamformerFrameViewKind kind)
 {
 	if (kind == BeamformerFrameViewKind_Copy)
 		vk_buffer_release(&bv->copy_buffer);
 
 	if (kind != BeamformerFrameViewKind_3DXPlane) {
 		if (bv->axial_scale_bar.scale_bar.savepoint_stack)
 			SLLPushFreelist(bv->axial_scale_bar.scale_bar.savepoint_stack, ui->scale_bar_savepoint_freelist);
 		if (bv->lateral_scale_bar.scale_bar.savepoint_stack)
 			SLLPushFreelist(bv->lateral_scale_bar.scale_bar.savepoint_stack, ui->scale_bar_savepoint_freelist);
 	}
 }
 
 function void
 ui_variable_free(BeamformerUI *ui, Variable *var)
 {
 	if (var) {
 		var->parent = 0;
 		while (var) {
 			if (var->type == VT_GROUP) {
 				var = var->group.first;
 			} else {
 				if (var->type == VT_BEAMFORMER_FRAME_VIEW) {
 					/* TODO(rnp): instead there should be a way of linking these up */
 					BeamformerFrameView *bv = var->generic;
 					ui_beamformer_frame_view_release_subresources(ui, bv, bv->kind);
 					DLLRemove(0, ui->view_first, ui->view_last, bv, next, prev);
 					SLLPushFreelist(bv, ui->view_freelist);
 				}
 
 				Variable *dead = var;
 				if (var->next) {
 					var = var->next;
 				} else {
 					var = var->parent;
 					/* NOTE(rnp): when we assign parent here we have already
 					 * released the children. Assign type so we don't loop */
 					if (var) var->type = VT_NULL;
 				}
 				SLLPushFreelist(dead, ui->variable_freelist);
 			}
 		}
 	}
 }
 
 function void
 ui_variable_free_group_items(BeamformerUI *ui, Variable *group)
 {
 	assert(group->type == VT_GROUP);
 	/* NOTE(rnp): prevent traversal back to us */
 	group->group.last->parent = 0;
 	ui_variable_free(ui, group->group.first);
 	group->group.first = group->group.last = 0;
 }
 
 function void
 ui_view_free(BeamformerUI *ui, Variable *view)
 {
 	assert(view->type == VT_UI_VIEW);
 	ui_variable_free(ui, view->view.child);
 	ui_variable_free(ui, view->view.close);
 	ui_variable_free(ui, view->view.menu);
 	ui_variable_free(ui, view);
 }
 
 function Variable *
 fill_variable(Variable *var, Variable *group, s8 name, u32 flags, VariableType type, Font font)
 {
 	var->flags      = flags;
 	var->type       = type;
 	var->name       = name;
 	var->parent     = group;
 	var->name_width = measure_text(font, name).x;
 
 	if (group && group->type == VT_GROUP) {
 		if (group->group.last) group->group.last = group->group.last->next = var;
 		else                   group->group.last = group->group.first      = var;
 	}
 
 	return var;
 }
 
 function Variable *
 add_variable(BeamformerUI *ui, Variable *group, Arena *arena, s8 name, u32 flags,
              VariableType type, Font font)
 {
 	Variable *result = SLLPopFreelist(ui->variable_freelist);
 	if (!result) result = push_struct_no_zero(arena, Variable);
 	zero_struct(result);
 	return fill_variable(result, group, name, flags, type, font);
 }
 
 function Variable *
 add_variable_group(BeamformerUI *ui, Variable *group, Arena *arena, s8 name, VariableGroupKind kind, Font font)
 {
 	Variable *result   = add_variable(ui, group, arena, name, V_INPUT, VT_GROUP, font);
 	result->group.kind = kind;
 	return result;
 }
 
 function Variable *
 end_variable_group(Variable *group)
 {
 	assert(group->type == VT_GROUP);
 	return group->parent;
 }
 
 function void
 fill_variable_cycler(Variable *cycler, u32 *store, s8 *labels, u32 cycle_count)
 {
 	cycler->cycler.cycle_length = cycle_count;
 	cycler->cycler.state        = store;
 	cycler->cycler.labels       = labels;
 }
 
 function Variable *
 add_variable_cycler(BeamformerUI *ui, Variable *group, Arena *arena, u32 flags, Font font, s8 name,
                     u32 *store, s8 *labels, u32 cycle_count)
 {
 	Variable *result = add_variable(ui, group, arena, name, V_INPUT|flags, VT_CYCLER, font);
 	fill_variable_cycler(result, store, labels, cycle_count);
 	return result;
 }
 
 function Variable *
 add_button(BeamformerUI *ui, Variable *group, Arena *arena, s8 name, UIButtonID id,
            u32 flags, Font font)
 {
 	Variable *result = add_variable(ui, group, arena, name, V_INPUT|flags, VT_UI_BUTTON, font);
 	result->button   = id;
 	return result;
 }
 
 function Variable *
 add_ui_split(BeamformerUI *ui, Variable *parent, Arena *arena, s8 name, f32 fraction,
              RegionSplitDirection direction, Font font)
 {
 	Variable *result = add_variable(ui, parent, arena, name, V_HIDES_CURSOR, VT_UI_REGION_SPLIT, font);
 	result->region_split.direction = direction;
 	result->region_split.fraction  = fraction;
 	return result;
 }
 
 function Variable *
 add_global_menu_to_group(BeamformerUI *ui, Arena *arena, Variable *group)
 {
 	#define X(id, text) add_button(ui, group, arena, s8(text), UI_BID_ ##id, 0, ui->small_font);
 	GLOBAL_MENU_BUTTONS
 	#undef X
 	return group;
 }
 
 function Variable *
 add_global_menu(BeamformerUI *ui, Arena *arena, Variable *parent)
 {
 	Variable *result = add_variable_group(ui, 0, arena, s8(""), VariableGroupKind_List, ui->small_font);
 	result->parent = parent;
 	return add_global_menu_to_group(ui, arena, result);
 }
 
 function Variable *
 add_ui_view(BeamformerUI *ui, Variable *parent, Arena *arena, s8 name, u32 view_flags, b32 menu, b32 closable)
 {
 	Variable *result = add_variable(ui, parent, arena, name, 0, VT_UI_VIEW, ui->small_font);
 	UIView   *view   = &result->view;
 	view->flags      = view_flags;
 	if (menu) view->menu = add_global_menu(ui, arena, result);
 	if (closable) {
 		view->close = add_button(ui, 0, arena, s8(""), UI_BID_VIEW_CLOSE, 0, ui->small_font);
 		/* NOTE(rnp): we do this explicitly so that close doesn't end up in the view group */
 		view->close->parent = result;
 	}
 	return result;
 }
 
 function Variable *
 add_floating_view(BeamformerUI *ui, Arena *arena, VariableType type, v2 at, Variable *child, b32 closable)
 {
 	Variable *result = add_ui_view(ui, 0, arena, s8(""), UIViewFlag_Floating, 0, closable);
 	result->type          = type;
 	result->view.rect.pos = at;
 	result->view.child    = child;
 
 	result->parent = &ui->floating_widget_sentinal;
 	result->next   = ui->floating_widget_sentinal.next;
 	result->next->parent = result;
 	ui->floating_widget_sentinal.next = result;
 	return result;
 }
 
 function void
 fill_beamformer_variable(Variable *var, s8 suffix, f32 *store, v2 limits, f32 display_scale, f32 scroll_scale)
 {
 	BeamformerVariable *bv = &var->beamformer_variable;
 	bv->suffix        = suffix;
 	bv->store         = store;
 	bv->display_scale = display_scale;
 	bv->scroll_scale  = scroll_scale;
 	bv->limits        = limits;
 }
 
 function void
 add_beamformer_variable(BeamformerUI *ui, Variable *group, Arena *arena, s8 name, s8 suffix, f32 *store,
                         v2 limits, f32 display_scale, f32 scroll_scale, u32 flags, Font font)
 {
 	Variable *var = add_variable(ui, group, arena, name, flags, VT_BEAMFORMER_VARIABLE, font);
 	fill_beamformer_variable(var, suffix, store, limits, display_scale, scroll_scale);
 }
 
 function Variable *
 add_beamformer_parameters_view(Variable *parent, BeamformerCtx *ctx)
 {
 	BeamformerUI *ui           = ctx->ui;
 	BeamformerUIParameters *bp = &ui->params;
 
 	v2 v2_inf = {.x = -F32_INFINITY, .y = F32_INFINITY};
 
 	/* TODO(rnp): this can be closable once we have a way of opening new views */
 	Variable *result = add_ui_view(ui, parent, &ui->arena, s8("Parameters"), 0, 1, 0);
 	Variable *group  = result->view.child = add_variable(ui, result, &ui->arena, s8(""), 0,
 	                                                     VT_GROUP, ui->font);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("Sampling Frequency:"), s8("[MHz]"),
 	                        &bp->sampling_frequency, (v2){0}, 1e-6f, 0, 0, ui->font);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("Demodulation Frequency:"), s8("[MHz]"),
 	                        &bp->demodulation_frequency, (v2){.y = 100e6f}, 1e-6f, 0, 0, ui->font);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("Speed of Sound:"), s8("[m/s]"),
 	                        &bp->speed_of_sound, (v2){.y = 1e6f}, 1.0f, 10.0f,
 	                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 	group = add_variable_group(ui, group, &ui->arena, s8("Lateral Extent:"),
 	                           VariableGroupKind_Vector, ui->font);
 	{
 		add_beamformer_variable(ui, group, &ui->arena, s8("Min:"), s8("[mm]"),
 		                        &ui->min_coordinate.x, v2_inf, 1e3f, 0.5e-3f,
 		                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 		add_beamformer_variable(ui, group, &ui->arena, s8("Max:"), s8("[mm]"),
 		                        &ui->max_coordinate.x, v2_inf, 1e3f, 0.5e-3f,
 		                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 	}
 	group = end_variable_group(group);
 
 	group = add_variable_group(ui, group, &ui->arena, s8("Axial Extent:"),
 	                           VariableGroupKind_Vector, ui->font);
 	{
 		add_beamformer_variable(ui, group, &ui->arena, s8("Min:"), s8("[mm]"),
 		                        &ui->min_coordinate.y, v2_inf, 1e3f, 0.5e-3f,
 		                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 		add_beamformer_variable(ui, group, &ui->arena, s8("Max:"), s8("[mm]"),
 		                        &ui->max_coordinate.y, v2_inf, 1e3f, 0.5e-3f,
 		                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 	}
 	group = end_variable_group(group);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("Off Axis Position:"), s8("[mm]"),
 	                        &ui->off_axis_position, v2_inf, 1e3f, 0.5e-3f,
 	                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("Beamform Plane:"), s8(""),
 	                        &ui->beamform_plane, (v2){{0, 1.0f}}, 1.0f, 0.025f,
 	                        V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 	add_beamformer_variable(ui, group, &ui->arena, s8("F#:"), s8(""), &bp->f_number, (v2){.y = 1e3f},
 	                        1, 0.1f, V_INPUT|V_TEXT|V_CAUSES_COMPUTE, ui->font);
 
 	add_variable_cycler(ui, group, &ui->arena, V_CAUSES_COMPUTE, ui->font, s8("Interpolation:"),
 	                    &bp->interpolation_mode, beamformer_interpolation_mode_strings,
 	                    countof(beamformer_interpolation_mode_strings));
 
 	read_only local_persist s8 true_false_labels[] = {s8_comp("False"), s8_comp("True")};
 	add_variable_cycler(ui, group, &ui->arena, V_CAUSES_COMPUTE, ui->font, s8("Coherency Weighting:"),
 	                    &bp->coherency_weighting, true_false_labels, countof(true_false_labels));
 
 	return result;
 }
 
 function void
 ui_beamformer_frame_view_convert(BeamformerUI *ui, Arena *arena, Variable *view, Variable *menu,
                                  BeamformerFrameViewKind kind, BeamformerFrameView *old, b32 log_scale)
 {
 	assert(menu->group.first == menu->group.last && menu->group.first == 0);
 	assert(view->type == VT_BEAMFORMER_FRAME_VIEW);
 
 	BeamformerFrameView *bv = view->generic;
 	bv->kind  = kind;
 	bv->dirty = 1;
 
 	fill_variable(&bv->dynamic_range, view, s8("Dynamic Range:"), V_INPUT|V_TEXT|V_UPDATE_VIEW,
 	              VT_F32, ui->small_font);
 	fill_variable(&bv->threshold, view, s8("Threshold:"), V_INPUT|V_TEXT|V_UPDATE_VIEW,
 	              VT_F32, ui->small_font);
 	fill_variable(&bv->gamma, view, s8("Gamma:"), V_INPUT|V_TEXT|V_UPDATE_VIEW,
 	              VT_SCALED_F32, ui->small_font);
 
 	bv->dynamic_range.real32      = old? old->dynamic_range.real32      : 50.0f;
 	bv->threshold.real32          = old? old->threshold.real32          : 55.0f;
 	bv->gamma.scaled_real32.val   = old? old->gamma.scaled_real32.val   : 1.0f;
 	bv->gamma.scaled_real32.scale = old? old->gamma.scaled_real32.scale : 0.05f;
 	bv->min_coordinate = old ? m4_mul_v4(old->frame.voxel_transform, (v4){{0.0f, 0.0f, 0.0f, 1.0f}}).xyz
 	                         : (v3){0};
 	bv->max_coordinate = old ? m4_mul_v4(old->frame.voxel_transform, (v4){{1.0f, 1.0f, 1.0f, 1.0f}}).xyz
 	                         : (v3){0};
 
 	#define X(_t, pretty) s8_comp(pretty),
 	read_only local_persist s8 kind_labels[] = {BEAMFORMER_FRAME_VIEW_KIND_LIST};
 	#undef X
 	bv->kind_cycler = add_variable_cycler(ui, menu, arena, V_EXTRA_ACTION, ui->small_font,
 	                                      s8("Kind:"), (u32 *)&bv->kind, kind_labels, countof(kind_labels));
 
 	/* TODO(rnp): this is quite dumb. what we actually want is to render directly
 	 * into the view region with the appropriate size for that region (scissor) */
 	resize_frame_view(bv, (uv2){{FRAME_VIEW_RENDER_TARGET_SIZE}});
 
 	switch (kind) {
 	case BeamformerFrameViewKind_3DXPlane:{
 		view->flags |= V_HIDES_CURSOR;
 		glTextureParameteri(bv->texture, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 		glTextureParameteri(bv->texture, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 		fill_variable(bv->x_plane_shifts + 0, view, s8("XZ Shift"), V_INPUT|V_HIDES_CURSOR,
 		              VT_X_PLANE_SHIFT, ui->small_font);
 		fill_variable(bv->x_plane_shifts + 1, view, s8("YZ Shift"), V_INPUT|V_HIDES_CURSOR,
 		              VT_X_PLANE_SHIFT, ui->small_font);
 		bv->demo = add_variable(ui, menu, arena, s8("Demo Mode"), V_INPUT|V_RADIO_BUTTON, VT_B32, ui->small_font);
 	}break;
 	default:{
 		view->flags &= ~(u32)V_HIDES_CURSOR;
 		fill_variable(&bv->lateral_scale_bar, view, s8(""), V_INPUT, VT_SCALE_BAR, ui->small_font);
 		fill_variable(&bv->axial_scale_bar,   view, s8(""), V_INPUT, VT_SCALE_BAR, ui->small_font);
 		ScaleBar *lateral            = &bv->lateral_scale_bar.scale_bar;
 		ScaleBar *axial              = &bv->axial_scale_bar.scale_bar;
 		lateral->direction           = SB_LATERAL;
 		axial->direction             = SB_AXIAL;
 		lateral->scroll_scale        = (v2){{-0.5e-3f, 0.5e-3f}};
 		axial->scroll_scale          = (v2){{ 0,       1.0e-3f}};
 		lateral->zoom_starting_coord = F32_INFINITY;
 		axial->zoom_starting_coord   = F32_INFINITY;
 
 		b32 copy = kind == BeamformerFrameViewKind_Copy;
 		v3 N = (v3){.y = 1.0f};
 		if (old) N = cross(old->frame.voxel_transform.c[0].xyz, old->frame.voxel_transform.c[1].xyz);
 
 		BeamformerViewPlaneTag plane = ui_plane_layout_from_normal(v3_normalize(N));
 		switch (plane) {
 		case BeamformerViewPlaneTag_XY:{
 			lateral->min_value = copy ? &bv->min_coordinate.x : &ui->min_coordinate.x;
 			lateral->max_value = copy ? &bv->max_coordinate.x : &ui->max_coordinate.x;
 			axial->min_value   = copy ? &bv->min_coordinate.y : &ui->min_coordinate.y;
 			axial->max_value   = copy ? &bv->max_coordinate.y : &ui->max_coordinate.y;
 		}break;
 
 		case BeamformerViewPlaneTag_XZ:{
 			lateral->min_value = copy ? &bv->min_coordinate.x : &ui->min_coordinate.x;
 			lateral->max_value = copy ? &bv->max_coordinate.x : &ui->max_coordinate.x;
 			axial->min_value   = copy ? &bv->min_coordinate.z : &ui->min_coordinate.y;
 			axial->max_value   = copy ? &bv->max_coordinate.z : &ui->max_coordinate.y;
 		}break;
 
 		case BeamformerViewPlaneTag_YZ:{
 			lateral->min_value = copy ? &bv->min_coordinate.y : &ui->min_coordinate.x;
 			lateral->max_value = copy ? &bv->max_coordinate.y : &ui->max_coordinate.x;
 			axial->min_value   = copy ? &bv->min_coordinate.z : &ui->min_coordinate.y;
 			axial->max_value   = copy ? &bv->max_coordinate.z : &ui->max_coordinate.y;
 		}break;
 
 		default:{
 			lateral->min_value = copy ? &bv->min_coordinate.x : &ui->min_coordinate.x;
 			lateral->max_value = copy ? &bv->max_coordinate.x : &ui->max_coordinate.x;
 			axial->min_value   = copy ? &bv->min_coordinate.z : &ui->min_coordinate.y;
 			axial->max_value   = copy ? &bv->max_coordinate.z : &ui->max_coordinate.y;
 		}break;
 		}
 
 		#define X(id, text) add_button(ui, menu, arena, s8(text), UI_BID_ ##id, 0, ui->small_font);
 		FRAME_VIEW_BUTTONS
 		#undef X
 
 		bv->axial_scale_bar_active   = add_variable(ui, menu, arena, s8("Axial Scale Bar"),
 		                                            V_INPUT|V_RADIO_BUTTON, VT_B32, ui->small_font);
 		bv->lateral_scale_bar_active = add_variable(ui, menu, arena, s8("Lateral Scale Bar"),
 		                                            V_INPUT|V_RADIO_BUTTON, VT_B32, ui->small_font);
 
 		if (kind == BeamformerFrameViewKind_Latest) {
 			bv->axial_scale_bar_active->bool32   = 1;
 			bv->lateral_scale_bar_active->bool32 = 1;
 			bv->axial_scale_bar.flags   |= V_CAUSES_COMPUTE;
 			bv->lateral_scale_bar.flags |= V_CAUSES_COMPUTE;
 		}
 	}break;
 	}
 
 	bv->log_scale = add_variable(ui, menu, arena, s8("Log Scale"),
 	                             V_INPUT|V_UPDATE_VIEW|V_RADIO_BUTTON, VT_B32, ui->small_font);
 	bv->log_scale->bool32 = log_scale;
 
 	switch (kind) {
 	case BeamformerFrameViewKind_Latest:{
 		#define X(_type, _id, pretty) s8_comp(pretty),
 		read_only local_persist s8 labels[] = {BEAMFORMER_VIEW_PLANE_TAG_LIST s8_comp("Any")};
 		#undef X
 		bv->cycler = add_variable_cycler(ui, menu, arena, 0, ui->small_font, s8("Live:"),
 		                                 &bv->cycler_state, labels, countof(labels));
 		bv->cycler_state = BeamformerViewPlaneTag_Count;
 	}break;
 	default:{}break;
 	}
 
 	add_global_menu_to_group(ui, arena, menu);
 }
 
 function BeamformerFrameView *
 ui_beamformer_frame_view_new(BeamformerUI *ui, Arena *arena)
 {
 	BeamformerFrameView *result = SLLPopFreelist(ui->view_freelist);
 	if (!result) result = push_struct_no_zero(arena, typeof(*result));
 	zero_struct(result);
 	result->export_handle.value[0] = OSInvalidHandleValue;
 	DLLInsertLast(0, ui->view_first, ui->view_last, result, next, prev);
 	return result;
 }
 
 function Variable *
 add_beamformer_frame_view(BeamformerUI *ui, Variable *parent, Arena *arena,
                           BeamformerFrameViewKind kind, b32 closable, BeamformerFrameView *old)
 {
 	/* TODO(rnp): this can be always closable once we have a way of opening new views */
 	Variable *result = add_ui_view(ui, parent, arena, s8(""), UIViewFlag_CustomText, 1, closable);
 	Variable *var = result->view.child = add_variable(ui, result, arena, s8(""), 0,
 	                                                  VT_BEAMFORMER_FRAME_VIEW, ui->small_font);
 	Variable *menu = result->view.menu = add_variable_group(ui, 0, arena, s8(""),
 	                                                        VariableGroupKind_List, ui->small_font);
 	menu->parent = result;
 	var->generic = ui_beamformer_frame_view_new(ui, arena);
 	ui_beamformer_frame_view_convert(ui, arena, var, menu, kind, old, old? old->log_scale->bool32 : 0);
 	return result;
 }
 
 function Variable *
 add_compute_progress_bar(Variable *parent, BeamformerCtx *ctx)
 {
 	BeamformerUI *ui = ctx->ui;
 	/* TODO(rnp): this can be closable once we have a way of opening new views */
 	Variable *result = add_ui_view(ui, parent, &ui->arena, s8(""), UIViewFlag_CustomText, 1, 0);
 	result->view.child = add_variable(ui, result, &ui->arena, s8(""), 0,
 	                                  VT_COMPUTE_PROGRESS_BAR, ui->small_font);
 	ComputeProgressBar *bar = &result->view.child->compute_progress_bar;
 	bar->progress   = &ctx->compute_context.processing_progress;
 	bar->processing = &ctx->compute_context.processing_compute;
 
 	return result;
 }
 
 function Variable *
 add_compute_stats_view(BeamformerUI *ui, Variable *parent, Arena *arena, BeamformerCtx *ctx)
 {
 	/* TODO(rnp): this can be closable once we have a way of opening new views */
 	Variable *result   = add_ui_view(ui, parent, arena, s8(""), UIViewFlag_CustomText, 0, 0);
 	result->view.child = add_variable(ui, result, &ui->arena, s8(""), 0,
 	                                  VT_COMPUTE_STATS_VIEW, ui->small_font);
 
 	Variable *menu = result->view.menu = add_variable_group(ui, 0, arena, s8(""),
 	                                                        VariableGroupKind_List, ui->small_font);
 	menu->parent = result;
 
 	#define X(_k, label) s8_comp(label),
 	read_only local_persist s8 labels[] = {COMPUTE_STATS_VIEW_LIST};
 	#undef X
 
 	ComputeStatsView *csv = &result->view.child->compute_stats_view;
 	csv->compute_shader_stats = ctx->compute_shader_stats;
 	csv->cycler = add_variable_cycler(ui, menu, arena, 0, ui->small_font, s8("Stats View:"),
 	                                  (u32 *)&csv->kind, labels, countof(labels));
 	add_global_menu_to_group(ui, arena, menu);
 	return result;
 }
 
 function Variable *
 add_live_controls_view(BeamformerUI *ui, Variable *parent, Arena *arena)
 {
 	BeamformerLiveImagingParameters *lip = &ui->shared_memory->live_imaging_parameters;
 	/* TODO(rnp): this can be closable once we have a way of opening new views */
 	Variable *result = add_ui_view(ui, parent, &ui->arena, s8("Live Controls"), 0, 1, 0);
 	result->view.child = add_variable(ui, result, &ui->arena, s8(""), 0,
 	                                  VT_LIVE_CONTROLS_VIEW, ui->small_font);
 	Variable *view = result->view.child;
 	BeamformerLiveControlsView *lv = view->generic = push_struct(arena, typeof(*lv));
 
 	fill_variable(&lv->transmit_power, view, s8(""), V_INPUT|V_LIVE_CONTROL,
 	              VT_BEAMFORMER_VARIABLE, ui->small_font);
 	fill_beamformer_variable(&lv->transmit_power, s8(""), &lip->transmit_power, (v2){{0, 1.0f}}, 100.0f, 0.05f);
 
 	for (u32 i = 0; i < countof(lv->tgc_control_points); i++) {
 		Variable *v = lv->tgc_control_points + i;
 		fill_variable(v, view, s8(""), V_INPUT|V_LIVE_CONTROL, VT_BEAMFORMER_VARIABLE, ui->small_font);
 		fill_beamformer_variable(v, s8(""), lip->tgc_control_points + i, (v2){{0, 1.0f}}, 0, 0.05f);
 	}
 
 	fill_variable(&lv->stop_button, view, s8("Stop Imaging"), V_INPUT|V_LIVE_CONTROL,
 	              VT_B32, ui->small_font);
 
 	read_only local_persist s8 save_labels[] = {s8_comp("Save Data"), s8_comp("Saving...")};
 	fill_variable(&lv->save_button, view, s8("Save Data"), V_INPUT|V_LIVE_CONTROL,
 	              VT_CYCLER, ui->small_font);
 	fill_variable_cycler(&lv->save_button, &lip->save_active, save_labels, countof(save_labels));
 
 	fill_variable(&lv->save_text, view, s8(""), V_INPUT|V_TEXT|V_LIVE_CONTROL,
 	              VT_LIVE_CONTROLS_STRING, ui->small_font);
 	lv->save_text.generic = lip;
 
 	return result;
 }
 
 function Variable *
 ui_split_region(BeamformerUI *ui, Variable *region, Variable *split_side, RegionSplitDirection direction)
 {
 	Variable *result = add_ui_split(ui, region, &ui->arena, s8(""), 0.5, direction, ui->small_font);
 	if (split_side == region->region_split.left) {
 		region->region_split.left  = result;
 	} else {
 		region->region_split.right = result;
 	}
 	split_side->parent = result;
 	result->region_split.left = split_side;
 	return result;
 }
 
 function void
 ui_add_live_frame_view(BeamformerUI *ui, Variable *view, RegionSplitDirection direction,
                        BeamformerFrameViewKind kind)
 {
 	Variable *region = view->parent;
 	assert(region->type == VT_UI_REGION_SPLIT);
 	assert(view->type   == VT_UI_VIEW);
 	Variable *new_region = ui_split_region(ui, region, view, direction);
 	new_region->region_split.right = add_beamformer_frame_view(ui, new_region, &ui->arena, kind, 1, 0);
 }
 
 function void
 ui_beamformer_frame_view_copy_frame(BeamformerUI *ui, BeamformerFrameView *new, BeamformerFrameView *old)
 {
 	mem_copy(&new->frame, &old->frame, sizeof(old->frame));
 
 	iv3 points     = new->frame.points;
 	i64 frame_size = points.x * points.y * points.z * beamformer_data_kind_byte_size[new->frame.data_kind];
 
 	Stream sb = arena_stream(ui->arena);
 	stream_append_s8(&sb, s8("Frame Copy ["));
 	stream_append_hex_u64(&sb, new->frame.id);
 	stream_append_s8(&sb, s8("]"));
 	stream_append_byte(&sb, 0);
 
 	GPUBufferAllocateInfo allocate_info = {
 		.size  = frame_size,
 		.flags = VulkanUsageFlag_TransferDestination,
 		.label = stream_to_s8(&sb),
 	};
 	vk_buffer_allocate(&new->copy_buffer, &allocate_info);
 
 	GPUBuffer *backlog = ui->beamformer_context->compute_context.backlog.buffer;
 	VulkanHandle cmd = vk_command_begin(VulkanTimeline_Compute);
 	vk_command_wait_timeline(cmd, VulkanTimeline_Compute, old->frame.timeline_valid_value);
 	vk_command_copy_buffer(cmd, &new->copy_buffer, backlog, old->frame.buffer_offset, frame_size);
 	new->frame.timeline_valid_value = vk_command_end(cmd, (VulkanHandle){0}, (VulkanHandle){0});
 }
 
 function void
 ui_copy_frame(BeamformerUI *ui, Variable *view, RegionSplitDirection direction)
 {
 	Variable *region = view->parent;
 	assert(region->type == VT_UI_REGION_SPLIT);
 	assert(view->type   == VT_UI_VIEW);
 
 	BeamformerFrameView *old = view->view.child->generic;
 	Variable *new_region = ui_split_region(ui, region, view, direction);
 	new_region->region_split.right = add_beamformer_frame_view(ui, new_region, &ui->arena,
 	                                                           BeamformerFrameViewKind_Copy, 1, old);
 
 	BeamformerFrameView *bv = new_region->region_split.right->view.child->generic;
 	ui_beamformer_frame_view_copy_frame(ui, bv, old);
 }
 
 function v3
 beamformer_frame_view_plane_size(BeamformerUI *ui, BeamformerFrameView *view)
 {
 	assert(view->kind == BeamformerFrameViewKind_3DXPlane);
 	v3 result = {0};
 	result.xy = v2_sub(ui->max_coordinate, ui->min_coordinate);
 	result.x  = Max(1e-3f, result.x);
 	result.y  = Max(1e-3f, result.y);
 	result.z  = Max(1e-3f, result.z);
 	return result;
 }
 
 function f32
 x_plane_rotation_for_view_plane(BeamformerFrameView *view, BeamformerViewPlaneTag tag)
 {
 	f32 result = view->rotation;
 	if (tag == BeamformerViewPlaneTag_YZ)
 		result += 0.25f;
 	return result;
 }
 
 function v2
 normalized_p_in_rect(Rect r, v2 p, b32 invert_y)
 {
 	v2 result = v2_div(v2_scale(v2_sub(p, r.pos), 2.0f), r.size);
 	if (invert_y) result = (v2){{result.x - 1.0f, 1.0f - result.y}};
 	else          result = v2_sub(result, (v2){{1.0f, 1.0f}});
 	return result;
 }
 
 function v3
 x_plane_position(BeamformerUI *ui)
 {
 	f32 y_min = ui->min_coordinate.y;
 	f32 y_max = ui->max_coordinate.y;
 	v3 result = {.y = y_min + (y_max - y_min) / 2};
 	return result;
 }
 
 function v3
 offset_x_plane_position(BeamformerUI *ui, BeamformerFrameView *view, BeamformerViewPlaneTag tag)
 {
 	BeamformerLiveImagingParameters *li = &ui->shared_memory->live_imaging_parameters;
 	m4 x_rotation = m4_rotation_about_y(x_plane_rotation_for_view_plane(view, tag));
 	v3 Z = x_rotation.c[2].xyz;
 	v3 offset = v3_scale(Z, li->image_plane_offsets[tag]);
 	v3 result = v3_add(x_plane_position(ui), offset);
 	return result;
 }
 
 function v3
 camera_for_x_plane_view(BeamformerUI *ui, BeamformerFrameView *view)
 {
 	v3 size   = beamformer_frame_view_plane_size(ui, view);
 	v3 target = x_plane_position(ui);
 	f32 dist  = v2_magnitude(XY(size));
 	v3 result = v3_add(target, (v3){{dist, -0.5f * size.y * tan_f32(50.0f * PI / 180.0f), dist}});
 	return result;
 }
 
 function m4
 view_matrix_for_x_plane_view(BeamformerUI *ui, BeamformerFrameView *view, v3 camera)
 {
 	assert(view->kind == BeamformerFrameViewKind_3DXPlane);
 	m4 result = camera_look_at(camera, x_plane_position(ui));
 	return result;
 }
 
 function m4
 projection_matrix_for_x_plane_view(BeamformerFrameView *view)
 {
 	assert(view->kind == BeamformerFrameViewKind_3DXPlane);
 	f32 aspect = (f32)view->colour_image.width / (f32)view->colour_image.height;
 	m4 result = perspective_projection(10e-3f, 500e-3f, 45.0f * PI / 180.0f, aspect);
 	return result;
 }
 
 function ray
 ray_for_x_plane_view(BeamformerUI *ui, BeamformerFrameView *view, v2 uv)
 {
 	assert(view->kind == BeamformerFrameViewKind_3DXPlane);
 	ray result  = {.origin = camera_for_x_plane_view(ui, view)};
 	v4 ray_clip = {{uv.x, uv.y, -1.0f, 1.0f}};
 
 	/* TODO(rnp): combine these so we only do one matrix inversion */
 	m4 proj_m   = projection_matrix_for_x_plane_view(view);
 	m4 view_m   = view_matrix_for_x_plane_view(ui, view, result.origin);
 	m4 proj_inv = m4_inverse(proj_m);
 	m4 view_inv = m4_inverse(view_m);
 
 	v4 ray_eye  = {.z = -1};
 	ray_eye.x   = v4_dot(m4_row(proj_inv, 0), ray_clip);
 	ray_eye.y   = v4_dot(m4_row(proj_inv, 1), ray_clip);
 	result.direction = v3_normalize(m4_mul_v4(view_inv, ray_eye).xyz);
 
 	return result;
 }
 
 function BeamformerViewPlaneTag
 view_plane_tag_from_x_plane_shift(BeamformerFrameView *view, Variable *x_plane_shift)
 {
 	assert(BETWEEN(x_plane_shift, view->x_plane_shifts + 0, view->x_plane_shifts + 1));
 	BeamformerViewPlaneTag result = BeamformerViewPlaneTag_XZ;
 	if (x_plane_shift == view->x_plane_shifts + 1)
 		result = BeamformerViewPlaneTag_YZ;
 	return result;
 }
 
 function void
 render_single_xplane(BeamformerUI *ui, BeamformerFrameView *view, Variable *x_plane_shift,
                      f32 rotation_turns, v3 translate, BeamformerViewPlaneTag tag,
                      VulkanHandle command, BeamformerRenderBeamformedPushConstants *pc)
 {
 	GPUBuffer *beamformed_buffer = ui->beamformer_context->compute_context.backlog.buffer;
 	pc->input_data = 0;
 	if (ui->latest_plane_valid[tag]) {
 		BeamformerFrame *f = ui->latest_plane + tag;
 		pc->input_data   = beamformed_buffer->gpu_pointer + f->buffer_offset;
 		pc->input_size_x = f->points.x;
 		pc->input_size_y = f->points.y;
 		pc->input_size_z = f->points.z;
 		pc->data_kind    = f->data_kind;
 		vk_command_wait_timeline(command, VulkanTimeline_Compute, f->timeline_valid_value);
 	}
 
 	v3 camera = camera_for_x_plane_view(ui, view);
 	v3 scale  = beamformer_frame_view_plane_size(ui, view);
 
 	m4 model_transform = y_aligned_volume_transform(scale, translate, rotation_turns);
 	m4 view_m          = view_matrix_for_x_plane_view(ui, view, camera);
 	m4 projection      = projection_matrix_for_x_plane_view(view);
 
 	//pc->mvp_matrix          = m4_mul(m4_mul(model_transform, view_m), projection);
 	pc->mvp_matrix            = m4_mul(projection, m4_mul(view_m, model_transform));
 	pc->bounding_box_colour   = v4_lerp(FG_COLOUR, HOVERED_COLOUR, x_plane_shift->hover_t);
 	pc->bounding_box_fraction = FRAME_VIEW_BB_FRACTION;
 
 	vk_command_push_constants(command, 0, sizeof(*pc), pc);
 	vk_command_draw(command, &ui->unit_cube_model.model);
 
 	XPlaneShift *xp = &x_plane_shift->x_plane_shift;
 	v3 xp_delta = v3_sub(xp->end_point, xp->start_point);
 	if (!f32_equal(v3_magnitude(xp_delta), 0)) {
 		m4 x_rotation = m4_rotation_about_y(rotation_turns);
 		v3 Z = x_rotation.c[2].xyz;
 		v3 f = v3_scale(Z, v3_dot(Z, v3_sub(xp->end_point, xp->start_point)));
 
 		/* TODO(rnp): there is no reason to compute the rotation matrix again */
 		model_transform = y_aligned_volume_transform(scale, v3_add(f, translate), rotation_turns);
 
 		pc->mvp_matrix            = m4_mul(projection, m4_mul(view_m, model_transform));
 		pc->bounding_box_colour   = HOVERED_COLOUR;
 		pc->bounding_box_fraction = 1.0f;
 		pc->input_data            = 0;
 
 		vk_command_push_constants(command, 0, sizeof(*pc), pc);
 		vk_command_draw(command, &ui->unit_cube_model.model);
 	}
 }
 
 function void
 render_3D_xplane(BeamformerUI *ui, BeamformerFrameView *view, VulkanHandle command, BeamformerRenderBeamformedPushConstants *pc)
 {
 	if (view->demo->bool32) {
 		view->rotation += dt_for_frame * 0.125f;
 		if (view->rotation > 1.0f) view->rotation -= 1.0f;
 	}
 
 	v3 model_translate = offset_x_plane_position(ui, view, BeamformerViewPlaneTag_XZ);
 	render_single_xplane(ui, view, view->x_plane_shifts + 0,
 	                     x_plane_rotation_for_view_plane(view, BeamformerViewPlaneTag_XZ),
 	                     model_translate, BeamformerViewPlaneTag_XZ, command, pc);
 	model_translate = offset_x_plane_position(ui, view, BeamformerViewPlaneTag_YZ);
 	model_translate.y -= 0.0001f;
 	render_single_xplane(ui, view, view->x_plane_shifts + 1,
 	                     x_plane_rotation_for_view_plane(view, BeamformerViewPlaneTag_YZ),
 	                     model_translate, BeamformerViewPlaneTag_YZ, command, pc);
 }
 
 function void
 render_2D_plane(BeamformerUI *ui, BeamformerFrameView *view, VulkanHandle command, BeamformerRenderBeamformedPushConstants *pc)
 {
 	m4 view_m     = m4_identity();
 	m4 model      = m4_scale((v3){{2.0f, 2.0f, 0.0f}});
 	m4 projection = orthographic_projection(0, 1, 1, 1);
 
 	GPUBuffer *beamformed_buffer = ui->beamformer_context->compute_context.backlog.buffer;
 	pc->mvp_matrix   = m4_mul(m4_mul(model, view_m), projection);
 	pc->input_data   = beamformed_buffer->gpu_pointer + view->frame.buffer_offset,
 	pc->input_size_x = view->frame.points.x,
 	pc->input_size_y = view->frame.points.y,
 	pc->input_size_z = view->frame.points.z,
 	pc->data_kind    = view->frame.data_kind,
 
 	vk_command_wait_timeline(command, VulkanTimeline_Compute, view->frame.timeline_valid_value);
 	vk_command_push_constants(command, 0, sizeof(*pc), pc);
 	vk_command_draw(command, &ui->unit_cube_model.model);
 }
 
 function b32
 frame_view_ready_to_present(BeamformerUI *ui, BeamformerFrameView *view)
 {
 	b32 result = view->colour_image.width > 0 || view->colour_image.height > 0;
 	return result;
 }
 
 function b32
 view_update(BeamformerUI *ui, BeamformerFrameView *view)
 {
 	if (view->kind == BeamformerFrameViewKind_Latest) {
 		u32 index = *view->cycler->cycler.state;
 		view->dirty |= view->frame.timeline_valid_value != ui->latest_plane[index].timeline_valid_value;
 		mem_copy(&view->frame, ui->latest_plane + index, sizeof(view->frame));
 		if (view->dirty) {
 			view->min_coordinate = m4_mul_v4(view->frame.voxel_transform, (v4){{0.0f, 0.0f, 0.0f, 1.0f}}).xyz;
 			view->max_coordinate = m4_mul_v4(view->frame.voxel_transform, (v4){{1.0f, 1.0f, 1.0f, 1.0f}}).xyz;
 		}
 	}
 
 	/* TODO(rnp): x-z or y-z */
 	// TODO(rnp): how to track this now? use pipeline handle value?
 	view->dirty |= ui->beamformer_context->render_shader_updated;
 	view->dirty |= view->kind == BeamformerFrameViewKind_3DXPlane;
 
 	b32 result = view->dirty;
 	return result;
 }
 
 function void
 update_frame_views(BeamformerUI *ui, Rect window)
 {
 	for (BeamformerFrameView *view = ui->view_first; view; view = view->next) {
 		if (view_update(ui, view)) {
 			BeamformerRenderBeamformedPushConstants pc = {
 				.bounding_box_colour = FRAME_VIEW_BB_COLOUR,
 				.db_cutoff           = view->log_scale->bool32 ? view->dynamic_range.real32 : 0,
 				.threshold           = view->threshold.real32,
 				.gamma               = view->gamma.scaled_real32.val,
 				.positions           = ui->unit_cube_model.model.gpu_pointer,
 				.normals             = ui->unit_cube_model.model.gpu_pointer + ui->unit_cube_model.normals_offset,
 			};
 
 			//start_renderdoc_capture();
 
 			glSignalSemaphoreEXT(ui->render_semaphores_gl[0], 0, 0, 1, &view->texture, (GLenum []){GL_NONE});
 
 			VulkanHandle cmd = vk_command_begin(VulkanTimeline_Graphics);
 			vk_command_bind_pipeline(cmd, ui->pipelines[BeamformerShaderKind_RenderBeamformed - BeamformerShaderKind_RenderFirst]);
 			vk_command_begin_rendering(cmd, &ui->render_3d_image, &ui->render_3d_depth_image, &view->colour_image);
 			vk_command_viewport(cmd, view->colour_image.width, view->colour_image.height, 0, 0, 0.0f, 1.0f);
 			vk_command_scissor(cmd, view->colour_image.width, view->colour_image.height, 0, 0);
 			if (view->kind == BeamformerFrameViewKind_3DXPlane) {
 				render_3D_xplane(ui, view, cmd, &pc);
 			} else {
 				render_2D_plane(ui, view, cmd, &pc);
 			}
 			vk_command_end_rendering(cmd);
 			vk_command_end(cmd, ui->render_semaphores[0], ui->render_semaphores[1]);
 
 			glWaitSemaphoreEXT(ui->render_semaphores_gl[1], 0, 0, 1, &view->texture, (GLenum[]){GL_LAYOUT_COLOR_ATTACHMENT_EXT});
 
 			//end_renderdoc_capture();
 
 			view->dirty = 0;
 		}
 	}
 }
 
 function Color
 colour_from_normalized(v4 rgba)
 {
 	Color result = {.r = (u8)(rgba.r * 255.0f), .g = (u8)(rgba.g * 255.0f),
 	                .b = (u8)(rgba.b * 255.0f), .a = (u8)(rgba.a * 255.0f)};
 	return result;
 }
 
 function Color
 fade(Color a, f32 visibility)
 {
 	a.a = (u8)((f32)a.a * visibility);
 	return a;
 }
 
 function v2
 draw_text_base(Font font, s8 text, v2 pos, Color colour)
 {
 	v2 off = v2_floor(pos);
 	f32 glyph_pad = (f32)font.glyphPadding;
 	for (iz i = 0; i < text.len; i++) {
 		/* NOTE: assumes font glyphs are ordered ASCII */
 		i32 idx = text.data[i] - 0x20;
 		Rectangle dst = {
 			off.x + (f32)font.glyphs[idx].offsetX - glyph_pad,
 			off.y + (f32)font.glyphs[idx].offsetY - glyph_pad,
 			font.recs[idx].width  + 2.0f * glyph_pad,
 			font.recs[idx].height + 2.0f * glyph_pad
 		};
 		Rectangle src = {
 			font.recs[idx].x - glyph_pad,
 			font.recs[idx].y - glyph_pad,
 			font.recs[idx].width  + 2.0f * glyph_pad,
 			font.recs[idx].height + 2.0f * glyph_pad
 		};
 		DrawTexturePro(font.texture, src, dst, (Vector2){0}, 0, colour);
 
 		off.x += (f32)font.glyphs[idx].advanceX;
 		if (font.glyphs[idx].advanceX == 0)
 			off.x += font.recs[idx].width;
 	}
 	v2 result = {{off.x - pos.x, (f32)font.baseSize}};
 	return result;
 }
 
 /* NOTE(rnp): expensive but of the available options in raylib this gives the best results */
 function v2
 draw_outlined_text(s8 text, v2 pos, TextSpec *ts)
 {
 	f32 ow = ts->outline_thick;
 	Color outline = colour_from_normalized(ts->outline_colour);
 	Color colour  = colour_from_normalized(ts->colour);
 	draw_text_base(*ts->font, text, v2_sub(pos, (v2){{ ow,  ow}}), outline);
 	draw_text_base(*ts->font, text, v2_sub(pos, (v2){{ ow, -ow}}), outline);
 	draw_text_base(*ts->font, text, v2_sub(pos, (v2){{-ow,  ow}}), outline);
 	draw_text_base(*ts->font, text, v2_sub(pos, (v2){{-ow, -ow}}), outline);
 
 	v2 result = draw_text_base(*ts->font, text, pos, colour);
 
 	return result;
 }
 
 function v2
 draw_text(s8 text, v2 pos, TextSpec *ts)
 {
 	if (ts->flags & TF_ROTATED) {
 		rlPushMatrix();
 		rlTranslatef(pos.x, pos.y, 0);
 		rlRotatef(ts->rotation, 0, 0, 1);
 		pos = (v2){0};
 	}
 
 	v2 result   = measure_text(*ts->font, text);
 	/* TODO(rnp): the size of this should be stored for each font */
 	s8 ellipsis = s8("...");
 	b32 clamped = ts->flags & TF_LIMITED && result.w > ts->limits.size.w;
 	if (clamped) {
 		f32 ellipsis_width = measure_text(*ts->font, ellipsis).x;
 		if (ellipsis_width < ts->limits.size.w) {
 			text = clamp_text_to_width(*ts->font, text, ts->limits.size.w - ellipsis_width);
 		} else {
 			text.len     = 0;
 			ellipsis.len = 0;
 		}
 	}
 
 	Color colour = colour_from_normalized(ts->colour);
 	if (ts->flags & TF_OUTLINED) result.x = draw_outlined_text(text, pos, ts).x;
 	else                         result.x = draw_text_base(*ts->font, text, pos, colour).x;
 
 	if (clamped) {
 		pos.x += result.x;
 		if (ts->flags & TF_OUTLINED) result.x += draw_outlined_text(ellipsis, pos, ts).x;
 		else                         result.x += draw_text_base(*ts->font, ellipsis, pos,
 		                                                        colour).x;
 	}
 
 	if (ts->flags & TF_ROTATED) rlPopMatrix();
 
 	return result;
 }
 
 function Rect
 extend_rect_centered(Rect r, v2 delta)
 {
 	r.size.w += delta.x;
 	r.size.h += delta.y;
 	r.pos.x  -= delta.x / 2;
 	r.pos.y  -= delta.y / 2;
 	return r;
 }
 
 function Rect
 shrink_rect_centered(Rect r, v2 delta)
 {
 	delta.x   = MIN(delta.x, r.size.w);
 	delta.y   = MIN(delta.y, r.size.h);
 	r.size.w -= delta.x;
 	r.size.h -= delta.y;
 	r.pos.x  += delta.x / 2;
 	r.pos.y  += delta.y / 2;
 	return r;
 }
 
 function Rect
 scale_rect_centered(Rect r, v2 scale)
 {
 	Rect or   = r;
 	r.size.w *= scale.x;
 	r.size.h *= scale.y;
 	r.pos.x  += (or.size.w - r.size.w) / 2;
 	r.pos.y  += (or.size.h - r.size.h) / 2;
 	return r;
 }
 
 function b32
 interactions_equal(Interaction a, Interaction b)
 {
 	b32 result = (a.kind == b.kind) && (a.generic == b.generic);
 	return result;
 }
 
 function b32
 interaction_is_sticky(Interaction a)
 {
 	b32 result = a.kind == InteractionKind_Text || a.kind == InteractionKind_Ruler;
 	return result;
 }
 
 function b32
 interaction_is_hot(BeamformerUI *ui, Interaction a)
 {
 	b32 result = interactions_equal(ui->hot_interaction, a);
 	return result;
 }
 
 function b32
 point_in_rect(v2 p, Rect r)
 {
 	v2  end    = v2_add(r.pos, r.size);
 	b32 result = Between(p.x, r.pos.x, end.x) & Between(p.y, r.pos.y, end.y);
 	return result;
 }
 
 function v2
 rect_uv(v2 p, Rect r)
 {
 	v2 result = v2_div(v2_sub(p, r.pos), r.size);
 	return result;
 }
 
 function v3
 world_point_from_plane_uv(m4 world, v2 uv)
 {
 	v3 U   = world.c[0].xyz;
 	v3 V   = world.c[1].xyz;
 	v3 min = world.c[3].xyz;
 	v3 result =  v3_add(v3_add(v3_scale(U, uv.x), v3_scale(V, uv.y)), min);
 	return result;
 }
 
 function v2
 screen_point_to_world_2d(v2 p, v2 screen_min, v2 screen_max, v2 world_min, v2 world_max)
 {
 	v2 pixels_to_m = v2_div(v2_sub(world_max, world_min), v2_sub(screen_max, screen_min));
 	v2 result      = v2_add(v2_mul(v2_sub(p, screen_min), pixels_to_m), world_min);
 	return result;
 }
 
 function v2
 world_point_to_screen_2d(v2 p, v2 world_min, v2 world_max, v2 screen_min, v2 screen_max)
 {
 	v2 m_to_pixels = v2_div(v2_sub(screen_max, screen_min), v2_sub(world_max, world_min));
 	v2 result      = v2_add(v2_mul(v2_sub(p, world_min), m_to_pixels), screen_min);
 	return result;
 }
 
 function b32
 hover_interaction(BeamformerUI *ui, v2 mouse, Interaction interaction)
 {
 	Variable *var = interaction.var;
 	b32 result = point_in_rect(mouse, interaction.rect);
 	if (result) ui->next_interaction = interaction;
 	if (interaction_is_hot(ui, interaction)) var->hover_t += HOVER_SPEED * dt_for_frame;
 	else                                     var->hover_t -= HOVER_SPEED * dt_for_frame;
 	var->hover_t = CLAMP01(var->hover_t);
 	return result;
 }
 
 function void
 draw_close_button(BeamformerUI *ui, Variable *close, v2 mouse, Rect r, v2 x_scale)
 {
 	assert(close->type == VT_UI_BUTTON);
 	hover_interaction(ui, mouse, auto_interaction(r, close));
 
 	Color colour = colour_from_normalized(v4_lerp(MENU_CLOSE_COLOUR, FG_COLOUR, close->hover_t));
 	r = scale_rect_centered(r, x_scale);
 	DrawLineEx(rl_v2(r.pos), rl_v2(v2_add(r.pos, r.size)), 4, colour);
 	DrawLineEx(rl_v2(v2_add(r.pos, (v2){.x = r.size.w})),
 	           rl_v2(v2_add(r.pos, (v2){.y = r.size.h})), 4, colour);
 }
 
 function Rect
 draw_title_bar(BeamformerUI *ui, Arena arena, Variable *ui_view, Rect r, v2 mouse)
 {
 	assert(ui_view->type == VT_UI_VIEW);
 	UIView *view = &ui_view->view;
 
 	s8 title = ui_view->name;
 	if (view->flags & UIViewFlag_CustomText) {
 		Stream buf = arena_stream(arena);
 		push_custom_view_title(&buf, ui_view->view.child);
 		title = arena_stream_commit(&arena, &buf);
 	}
 
 	Rect result, title_rect;
 	cut_rect_vertical(r, (f32)ui->small_font.baseSize + TITLE_BAR_PAD, &title_rect, &result);
 	cut_rect_vertical(result, LISTING_LINE_PAD, 0, &result);
 
 	DrawRectangleRec(rl_rect(title_rect), BLACK);
 
 	title_rect = shrink_rect_centered(title_rect, (v2){.x = 1.5f * TITLE_BAR_PAD});
 	DrawRectangleRounded(rl_rect(title_rect), 0.5f, 0, fade(colour_from_normalized(BG_COLOUR), 0.55f));
 	title_rect = shrink_rect_centered(title_rect, (v2){.x = 3.0f * TITLE_BAR_PAD});
 
 	if (view->close) {
 		Rect close;
 		cut_rect_horizontal(title_rect, title_rect.size.w - title_rect.size.h, &title_rect, &close);
 		draw_close_button(ui, view->close, mouse, close, (v2){{0.4f, 0.4f}});
 	}
 
 	if (view->menu) {
 		Rect menu;
 		cut_rect_horizontal(title_rect, title_rect.size.w - title_rect.size.h, &title_rect, &menu);
 		Interaction interaction = {.kind = InteractionKind_Menu, .var = view->menu, .rect = menu};
 		hover_interaction(ui, mouse, interaction);
 
 		Color colour = colour_from_normalized(v4_lerp(MENU_PLUS_COLOUR, FG_COLOUR, view->menu->hover_t));
 		menu = shrink_rect_centered(menu, (v2){{14.0f, 14.0f}});
 		DrawLineEx(rl_v2(v2_add(menu.pos, (v2){.x = menu.size.w / 2})),
 		           rl_v2(v2_add(menu.pos, (v2){.x = menu.size.w / 2, .y = menu.size.h})), 4, colour);
 		DrawLineEx(rl_v2(v2_add(menu.pos, (v2){.y = menu.size.h / 2})),
 		           rl_v2(v2_add(menu.pos, (v2){.x = menu.size.w, .y = menu.size.h / 2})), 4, colour);
 	}
 
 	v2 title_pos = title_rect.pos;
 	title_pos.y += 0.5f * TITLE_BAR_PAD;
 	TextSpec text_spec = {.font = &ui->small_font, .flags = TF_LIMITED, .colour = FG_COLOUR,
 	                      .limits.size = title_rect.size};
 	draw_text(title, title_pos, &text_spec);
 
 	return result;
 }
 
 /* TODO(rnp): once this has more callers decide if it would be better for this to take
  * an orientation rather than force CCW/right-handed */
 function void
 draw_ruler(BeamformerUI *ui, Arena arena, v2 start_point, v2 end_point,
            f32 start_value, f32 end_value, f32 *markers, u32 marker_count,
            u32 segments, s8 suffix, v4 marker_colour, v4 txt_colour)
 {
 	b32 draw_plus = SIGN(start_value) != SIGN(end_value);
 
 	end_point    = v2_sub(end_point, start_point);
 	f32 rotation = atan2_f32(end_point.y, end_point.x) * 180 / PI;
 
 	rlPushMatrix();
 	rlTranslatef(start_point.x, start_point.y, 0);
 	rlRotatef(rotation, 0, 0, 1);
 
 	f32 inc       = v2_magnitude(end_point) / (f32)segments;
 	f32 value_inc = (end_value - start_value) / (f32)segments;
 	f32 value     = start_value;
 
 	Stream buf = arena_stream(arena);
 	v2 sp = {0}, ep = {.y = RULER_TICK_LENGTH};
 	v2 tp = {{(f32)ui->small_font.baseSize / 2.0f, ep.y + RULER_TEXT_PAD}};
 	TextSpec text_spec = {.font = &ui->small_font, .rotation = 90.0f, .colour = txt_colour, .flags = TF_ROTATED};
 	Color rl_txt_colour = colour_from_normalized(txt_colour);
 
 	for (u32 j = 0; j <= segments; j++) {
 		DrawLineEx(rl_v2(sp), rl_v2(ep), 3, rl_txt_colour);
 
 		stream_reset(&buf, 0);
 		if (draw_plus && value > 0) stream_append_byte(&buf, '+');
 		stream_append_f64(&buf, value, Abs(value_inc) < 1 ? 100 : 10);
 		stream_append_s8(&buf, suffix);
 		draw_text(stream_to_s8(&buf), tp, &text_spec);
 
 		value += value_inc;
 		sp.x  += inc;
 		ep.x  += inc;
 		tp.x  += inc;
 	}
 
 	Color rl_marker_colour = colour_from_normalized(marker_colour);
 	ep.y += RULER_TICK_LENGTH;
 	for (u32 i = 0; i < marker_count; i++) {
 		if (markers[i] < F32_INFINITY) {
 			ep.x  = sp.x = markers[i];
 			DrawLineEx(rl_v2(sp), rl_v2(ep), 3, rl_marker_colour);
 			DrawCircleV(rl_v2(ep), 3, rl_marker_colour);
 		}
 	}
 
 	rlPopMatrix();
 }
 
 function void
 do_scale_bar(BeamformerUI *ui, Arena arena, Variable *scale_bar, v2 mouse, Rect draw_rect,
              f32 start_value, f32 end_value, s8 suffix)
 {
 	assert(scale_bar->type == VT_SCALE_BAR);
 	ScaleBar *sb = &scale_bar->scale_bar;
 
 	v2 txt_s = measure_text(ui->small_font, s8("-288.8 mm"));
 
 	Rect tick_rect = draw_rect;
 	v2   start_pos = tick_rect.pos;
 	v2   end_pos   = tick_rect.pos;
 	v2   relative_mouse = v2_sub(mouse, tick_rect.pos);
 
 	f32  markers[2];
 	u32  marker_count = 1;
 
 	v2 world_zoom_point  = {{sb->zoom_starting_coord, sb->zoom_starting_coord}};
 	v2 screen_zoom_point = world_point_to_screen_2d(world_zoom_point,
 	                                                (v2){{*sb->min_value, *sb->min_value}},
 	                                                (v2){{*sb->max_value, *sb->max_value}},
 	                                                (v2){0}, tick_rect.size);
 	u32  tick_count;
 	if (sb->direction == SB_AXIAL) {
 		tick_rect.size.x  = RULER_TEXT_PAD + RULER_TICK_LENGTH + txt_s.x;
 		tick_count        = (u32)(tick_rect.size.y / (1.5f * (f32)ui->small_font.baseSize));
 		start_pos.y      += tick_rect.size.y;
 		markers[0]        = tick_rect.size.y - screen_zoom_point.y;
 		markers[1]        = tick_rect.size.y - relative_mouse.y;
 	} else {
 		tick_rect.size.y  = RULER_TEXT_PAD + RULER_TICK_LENGTH + txt_s.x;
 		tick_count        = (u32)(tick_rect.size.x / (1.5f * (f32)ui->small_font.baseSize));
 		end_pos.x        += tick_rect.size.x;
 		markers[0]        = screen_zoom_point.x;
 		markers[1]        = relative_mouse.x;
 	}
 
 	if (hover_interaction(ui, mouse, auto_interaction(tick_rect, scale_bar)))
 		marker_count = 2;
 
 	draw_ruler(ui, arena, start_pos, end_pos, start_value, end_value, markers, marker_count,
 	           tick_count, suffix, RULER_COLOUR, v4_lerp(FG_COLOUR, HOVERED_COLOUR, scale_bar->hover_t));
 }
 
 function v2
 draw_radio_button(BeamformerUI *ui, Variable *var, v2 at, v2 mouse, v4 base_colour, f32 size)
 {
 	assert(var->type == VT_B32);
 	b32 value = var->bool32;
 
 	v2 result = (v2){.x = size, .y = size};
 	Rect hover_rect   = {.pos = at, .size = result};
 	hover_rect.pos.y += 1;
 	hover_interaction(ui, mouse, auto_interaction(hover_rect, var));
 
 	hover_rect = shrink_rect_centered(hover_rect, (v2){{8.0f, 8.0f}});
 	Rect inner = shrink_rect_centered(hover_rect, (v2){{4.0f, 4.0f}});
 	v4 fill = v4_lerp(value? base_colour : (v4){0}, HOVERED_COLOUR, var->hover_t);
 	DrawRectangleRoundedLinesEx(rl_rect(hover_rect), 0.2f, 0, 2, colour_from_normalized(base_colour));
 	DrawRectangleRec(rl_rect(inner), colour_from_normalized(fill));
 
 	return result;
 }
 
 function f32
 draw_variable_slider(BeamformerUI *ui, Variable *var, Rect r, f32 fill, v4 fill_colour, v2 mouse)
 {
 	f32  border_thick    = 3.0f;
 	f32  bar_height_frac = 0.8f;
 	v2   bar_size        = {{6.0f, bar_height_frac * r.size.y}};
 
 	Rect inner  = shrink_rect_centered(r, (v2){{2.0f * border_thick, // NOTE(rnp): raylib jank
 	                                            MAX(0, 2.0f * (r.size.y - bar_size.y))}});
 	Rect filled = inner;
 	filled.size.w *= fill;
 
 	Rect bar;
 	bar.pos  = v2_add(r.pos, (v2){{fill * (r.size.w - bar_size.w), (1 - bar_height_frac) * 0.5f * r.size.y}});
 	bar.size = bar_size;
 	v4 bar_colour = v4_lerp(FG_COLOUR, FOCUSED_COLOUR, var->hover_t);
 
 	hover_interaction(ui, mouse, auto_interaction(inner, var));
 
 	DrawRectangleRec(rl_rect(filled), colour_from_normalized(fill_colour));
 	DrawRectangleRoundedLinesEx(rl_rect(inner), 0.2f, 0, border_thick, BLACK);
 	DrawRectangleRounded(rl_rect(bar), 0.6f, 1, colour_from_normalized(bar_colour));
 
 	return r.size.y;
 }
 
 function v2
 draw_fancy_button(BeamformerUI *ui, Variable *var, s8 label, Rect r, v4 border_colour, v2 mouse, TextSpec ts)
 {
 	assert((f32)ts.font->baseSize <= r.size.h * 0.8f);
 	f32 pad = 0.1f * r.size.h;
 
 	v2   shadow_off   = {{2.5f, 3.0f}};
 	f32  border_thick = 3.0f;
 	v2   border_size  = v2_add((v2){{pad + 2.0f * border_thick, pad}}, shadow_off);
 
 	Rect border = shrink_rect_centered(r,      border_size);
 	Rect inner  = shrink_rect_centered(border, (v2){{pad, pad}});
 
 	ts.limits.size = inner.size;
 	hover_interaction(ui, mouse, auto_interaction(inner, var));
 
 	border.pos = v2_add(border.pos, shadow_off);
 
 	DrawRectangleRoundedLinesEx(rl_rect(border), 0.6f, 0, border_thick, fade(BLACK, 0.8f));
 	border.pos = v2_sub(border.pos, shadow_off);
 	DrawRectangleRounded(rl_rect(border), 0.6f, 1, colour_from_normalized(BG_COLOUR));
 	DrawRectangleRoundedLinesEx(rl_rect(border), 0.6f, 0, border_thick, colour_from_normalized(border_colour));
 
 	/* TODO(rnp): teach draw_text() about alignment */
 	v2 at = align_text_in_rect(label, inner, *ts.font);
 	at = v2_add(at, (v2){{3.0f, 3.0f}});
 	v4 base_colour = ts.colour;
 	ts.colour = (v4){{0, 0, 0, 0.8f}};
 	draw_text(label, at, &ts);
 
 	at = v2_sub(at, (v2){{3.0f, 3.0f}});
 	ts.colour = v4_lerp(base_colour, HOVERED_COLOUR, var->hover_t);
 	draw_text(label, at, &ts);
 
 	v2 result = v2_add(r.size, border_size);
 	return result;
 }
 
 function v2
 draw_variable(BeamformerUI *ui, Arena arena, Variable *var, v2 at, v2 mouse, v4 base_colour, TextSpec text_spec)
 {
 	v2 result;
 	if (var->flags & V_RADIO_BUTTON) {
 		result = draw_radio_button(ui, var, at, mouse, base_colour, (f32)text_spec.font->baseSize);
 	} else {
 		Stream buf = arena_stream(arena);
 		stream_append_variable(&buf, var);
 		s8 text = arena_stream_commit(&arena, &buf);
 		result = measure_text(*text_spec.font, text);
 
 		if (var->flags & V_INPUT) {
 			Rect text_rect = {.pos = at, .size = result};
 			text_rect = extend_rect_centered(text_rect, (v2){.x = 8});
 			if (hover_interaction(ui, mouse, auto_interaction(text_rect, var)) && (var->flags & V_TEXT))
 				ui->text_input_state.hot_font = text_spec.font;
 			text_spec.colour = v4_lerp(base_colour, HOVERED_COLOUR, var->hover_t);
 		}
 
 		draw_text(text, at, &text_spec);
 	}
 	return result;
 }
 
 function void
 draw_table_cell(BeamformerUI *ui, Arena arena, TableCell *cell, Rect cell_rect,
                 TextAlignment alignment, TextSpec ts, v2 mouse)
 {
 	f32 x_off  = cell_rect.pos.x;
 	v2 cell_at = table_cell_align(cell, alignment, cell_rect);
 	ts.limits.size.w -= (cell_at.x - x_off);
 	cell_rect.size.w  = MIN(ts.limits.size.w, cell_rect.size.w);
 
 	/* TODO(rnp): push truncated text for hovering */
 	switch (cell->kind) {
 	case TableCellKind_None:{ draw_text(cell->text, cell_at, &ts); }break;
 	case TableCellKind_Variable:{
 		if (cell->var->flags & V_INPUT) {
 			draw_variable(ui, arena, cell->var, cell_at, mouse, ts.colour, ts);
 		} else if (cell->text.len) {
 			draw_text(cell->text, cell_at, &ts);
 		}
 	}break;
 	case TableCellKind_VariableGroup:{
 		Variable *v = cell->var->group.first;
 		f32 dw = draw_text(s8("{"), cell_at, &ts).x;
 		while (v) {
 			cell_at.x        += dw;
 			ts.limits.size.w -= dw;
 			dw = draw_variable(ui, arena, v, cell_at, mouse, ts.colour, ts).x;
 
 			v = v->next;
 			if (v) {
 				cell_at.x        += dw;
 				ts.limits.size.w -= dw;
 				dw = draw_text(s8(", "), cell_at, &ts).x;
 			}
 		}
 		cell_at.x        += dw;
 		ts.limits.size.w -= dw;
 		draw_text(s8("}"), cell_at, &ts);
 	}break;
 	}
 }
 
 function void
 draw_table_borders(Table *t, Rect r, f32 line_height)
 {
 	if (t->column_border_thick > 0) {
 		v2 start  = {.x = r.pos.x, .y = r.pos.y + t->cell_pad.h / 2};
 		v2 end    = start;
 		end.y    += t->size.y - t->cell_pad.y;
 		for (i32 i = 0; i < t->columns - 1; i++) {
 			f32 dx = t->widths[i] + t->cell_pad.w + t->column_border_thick;
 			start.x += dx;
 			end.x   += dx;
 			if (t->widths[i + 1] > 0)
 				DrawLineEx(rl_v2(start), rl_v2(end), t->column_border_thick, fade(BLACK, 0.8f));
 		}
 	}
 
 	if (t->row_border_thick > 0) {
 		v2 start  = {.x = r.pos.x + t->cell_pad.w / 2, .y = r.pos.y};
 		v2 end    = start;
 		end.x    += t->size.x - t->cell_pad.x;
 		for (i32 i = 0; i < t->rows - 1; i++) {
 			f32 dy   = line_height + t->cell_pad.y + t->row_border_thick;
 			start.y += dy;
 			end.y   += dy;
 			DrawLineEx(rl_v2(start), rl_v2(end), t->row_border_thick, fade(BLACK, 0.8f));
 		}
 	}
 }
 
 function v2
 draw_table(BeamformerUI *ui, Arena arena, Table *table, Rect draw_rect, TextSpec ts, v2 mouse, b32 skip_rows)
 {
 	ts.flags |= TF_LIMITED;
 
 	v2 result         = {.x = table_width(table)};
 	i32 row_index     = skip_rows? table_skip_rows(table, draw_rect.size.h, (f32)ts.font->baseSize) : 0;
 	TableIterator *it = table_iterator_new(table, TIK_CELLS, &arena, row_index, draw_rect.pos, ts.font);
 	for (TableCell *cell = table_iterator_next(it, &arena);
 	     cell;
 	     cell = table_iterator_next(it, &arena))
 	{
 		ts.limits.size.w = draw_rect.size.w - (it->cell_rect.pos.x - it->start_x);
 		draw_table_cell(ui, arena, cell, it->cell_rect, it->alignment, ts, mouse);
 	}
 	draw_table_borders(table, draw_rect, (f32)ts.font->baseSize);
 	result.y = it->cell_rect.pos.y - draw_rect.pos.y - table->cell_pad.h / 2.0f;
 	return result;
 }
 
 function void
 draw_view_ruler(BeamformerFrameView *view, Arena a, Rect view_rect, TextSpec ts)
 {
 	v2 vr_max_p = v2_add(view_rect.pos, view_rect.size);
 
 	v3 U   = view->frame.voxel_transform.c[0].xyz;
 	v3 V   = view->frame.voxel_transform.c[1].xyz;
 	v3 min = view->frame.voxel_transform.c[3].xyz;
 
 	v2 start_uv = plane_uv(v3_sub(view->ruler.start, min), U, V);
 	v2 end_uv   = plane_uv(v3_sub(view->ruler.end,   min), U, V);
 
 	v2 start_p  = v2_add(view_rect.pos, v2_mul(start_uv, view_rect.size));
 	v2 end_p    = v2_add(view_rect.pos, v2_mul(end_uv,   view_rect.size));
 
 	b32 start_in_bounds = point_in_rect(start_p, view_rect);
 	b32 end_in_bounds   = point_in_rect(end_p,   view_rect);
 
 	// TODO(rnp): this should be a ray intersection not a clamp
 	start_p = clamp_v2_rect(start_p, view_rect);
 	end_p   = clamp_v2_rect(end_p, view_rect);
 
 	Color rl_colour = colour_from_normalized(ts.colour);
 	DrawLineEx(rl_v2(end_p), rl_v2(start_p), 2, rl_colour);
 	if (start_in_bounds) DrawCircleV(rl_v2(start_p), 3, rl_colour);
 	if (end_in_bounds)   DrawCircleV(rl_v2(end_p),   3, rl_colour);
 
 	Stream buf = arena_stream(a);
 	stream_append_f64(&buf, 1e3 * v3_magnitude(v3_sub(view->ruler.end, view->ruler.start)), 100);
 	stream_append_s8(&buf, s8(" mm"));
 
 	v2 txt_p = start_p;
 	v2 txt_s = measure_text(*ts.font, stream_to_s8(&buf));
 	v2 pixel_delta = v2_sub(start_p, end_p);
 	if (pixel_delta.y < 0) txt_p.y -= txt_s.y;
 	if (pixel_delta.x < 0) txt_p.x -= txt_s.x;
 	if (txt_p.x < view_rect.pos.x) txt_p.x = view_rect.pos.x;
 	if (txt_p.x + txt_s.x > vr_max_p.x) txt_p.x -= (txt_p.x + txt_s.x) - vr_max_p.x;
 
 	draw_text(stream_to_s8(&buf), txt_p, &ts);
 }
 
 function v2
 draw_frame_view_controls(BeamformerUI *ui, Arena arena, BeamformerFrameView *view, Rect vr, v2 mouse)
 {
 	TextSpec text_spec = {.font = &ui->small_font, .flags = TF_LIMITED|TF_OUTLINED,
 	                      .colour = RULER_COLOUR, .outline_thick = 1, .outline_colour.a = 1,
 	                      .limits.size.x = vr.size.w};
 
 	Table *table = table_new(&arena, 3, TextAlignment_Left, TextAlignment_Left, TextAlignment_Left);
 	table_push_parameter_row(table, &arena, view->gamma.name,     &view->gamma,     s8(""));
 	table_push_parameter_row(table, &arena, view->threshold.name, &view->threshold, s8(""));
 	if (view->log_scale->bool32)
 		table_push_parameter_row(table, &arena, view->dynamic_range.name, &view->dynamic_range, s8("[dB]"));
 
 	Rect table_rect = vr;
 	f32 height      = table_extent(table, arena, text_spec.font).y;
 	height          = MIN(height, vr.size.h);
 	table_rect.pos.w  += 8;
 	table_rect.pos.y  += vr.size.h - height - 8;
 	table_rect.size.h  = height;
 	table_rect.size.w  = vr.size.w - 16;
 
 	return draw_table(ui, arena, table, table_rect, text_spec, mouse, 0);
 }
 
 function void
 draw_3D_xplane_frame_view(BeamformerUI *ui, Arena arena, Variable *var, Rect display_rect, v2 mouse)
 {
 	assert(var->type == VT_BEAMFORMER_FRAME_VIEW);
 	BeamformerFrameView *view  = var->generic;
 
 	f32 aspect = (f32)view->colour_image.width / (f32)view->colour_image.height;
 	Rect vr = display_rect;
 	if (aspect > 1.0f) vr.size.w = vr.size.h;
 	else               vr.size.h = vr.size.w;
 
 	if (vr.size.w > display_rect.size.w) {
 		vr.size.w -= (vr.size.w - display_rect.size.w);
 		vr.size.h  = vr.size.w / aspect;
 	} else if (vr.size.h > display_rect.size.h) {
 		vr.size.h -= (vr.size.h - display_rect.size.h);
 		vr.size.w  = vr.size.h * aspect;
 	}
 	vr.pos = v2_add(vr.pos, v2_scale(v2_sub(display_rect.size, vr.size), 0.5));
 
 	i32 id = -1;
 	if (hover_interaction(ui, mouse, auto_interaction(vr, var))) {
 		ray mouse_ray  = ray_for_x_plane_view(ui, view, normalized_p_in_rect(vr, mouse, 0));
 		v3  x_size     = v3_scale(beamformer_frame_view_plane_size(ui, view), 0.5f);
 
 		f32 rotation   = x_plane_rotation_for_view_plane(view, BeamformerViewPlaneTag_XZ);
 		m4  x_rotation = m4_rotation_about_y(rotation);
 		v3  x_position = offset_x_plane_position(ui, view, BeamformerViewPlaneTag_XZ);
 
 		f32 test[2] = {0};
 		test[0] = obb_raycast(x_rotation, x_size, x_position, mouse_ray);
 
 		x_position = offset_x_plane_position(ui, view, BeamformerViewPlaneTag_YZ);
 		rotation   = x_plane_rotation_for_view_plane(view, BeamformerViewPlaneTag_YZ);
 		x_rotation = m4_rotation_about_y(rotation);
 		test[1] = obb_raycast(x_rotation, x_size, x_position, mouse_ray);
 
 		if (test[0] >= 0 && test[1] >= 0) id = test[1] < test[0]? 1 : 0;
 		else if (test[0] >= 0) id = 0;
 		else if (test[1] >= 0) id = 1;
 
 		if (id != -1) {
 			view->hit_test_point = v3_add(mouse_ray.origin, v3_scale(mouse_ray.direction, test[id]));
 		}
 	}
 
 	for (i32 i = 0; i < countof(view->x_plane_shifts); i++) {
 		Variable *it = view->x_plane_shifts + i;
 		Interaction interaction = auto_interaction(vr, it);
 		if (id == i) ui->next_interaction = interaction;
 		if (interaction_is_hot(ui, interaction)) it->hover_t += HOVER_SPEED * dt_for_frame;
 		else                                     it->hover_t -= HOVER_SPEED * dt_for_frame;
 		it->hover_t = CLAMP01(it->hover_t);
 	}
 
 	Rectangle  tex_r  = {0, 0, (f32)view->colour_image.width, (f32)view->colour_image.height};
 	NPatchInfo tex_np = {tex_r, 0, 0, 0, 0, NPATCH_NINE_PATCH};
 	DrawTextureNPatch(make_raylib_texture(view), tex_np, rl_rect(vr), (Vector2){0}, 0, WHITE);
 
 	draw_frame_view_controls(ui, arena, view, vr, mouse);
 }
 
 function void
 draw_beamformer_frame_view(BeamformerUI *ui, Arena a, Variable *var, Rect display_rect, v2 mouse)
 {
 	assert(var->type == VT_BEAMFORMER_FRAME_VIEW);
 	BeamformerFrameView *view  = var->generic;
 	BeamformerFrame     *frame = &view->frame;
 
 	b32 is_1d = iv3_dimension(frame->points) == 1;
 
 	f32 txt_w = measure_text(ui->small_font, s8("-288.8 mm")).w;
 	f32 scale_bar_size = 1.2f * txt_w + RULER_TICK_LENGTH;
 
 	v3 U = frame->voxel_transform.c[0].xyz;
 	v3 V = frame->voxel_transform.c[1].xyz;
 
 	v2 min_uv = plane_uv(view->min_coordinate, U, V);
 	v2 max_uv = plane_uv(view->max_coordinate, U, V);
 
 	v2 output_dim;
 	output_dim.x = v3_magnitude(U);
 	output_dim.y = v3_magnitude(V);
 
 	// NOTE(rnp): may be different from UV if recompute in progress or Copy View
 	v2 requested_dim;
 	requested_dim.x = v3_magnitude(v3_sub(v3_scale(U, max_uv.x), v3_scale(U, min_uv.x)));
 	requested_dim.y = v3_magnitude(v3_sub(v3_scale(V, max_uv.y), v3_scale(V, min_uv.y)));
 
 	f32 aspect = is_1d ? 1.0f : output_dim.w / output_dim.h;
 
 	Rect vr = display_rect;
 	v2 scale_bar_area = {0};
 	if (view->axial_scale_bar_active->bool32) {
 		vr.pos.y         += 0.5f * (f32)ui->small_font.baseSize;
 		scale_bar_area.x += scale_bar_size;
 		scale_bar_area.y += (f32)ui->small_font.baseSize;
 	}
 
 	if (view->lateral_scale_bar_active->bool32) {
 		vr.pos.x         += 0.5f * (f32)ui->small_font.baseSize;
 		scale_bar_area.x += (f32)ui->small_font.baseSize;
 		scale_bar_area.y += scale_bar_size;
 	}
 
 	vr.size = v2_sub(vr.size, scale_bar_area);
 	if (aspect > 1) vr.size.h = vr.size.w / aspect;
 	else            vr.size.w = vr.size.h * aspect;
 
 	v2 occupied = v2_add(vr.size, scale_bar_area);
 	if (occupied.w > display_rect.size.w) {
 		vr.size.w -= (occupied.w - display_rect.size.w);
 		vr.size.h  = vr.size.w / aspect;
 	} else if (occupied.h > display_rect.size.h) {
 		vr.size.h -= (occupied.h - display_rect.size.h);
 		vr.size.w  = vr.size.h * aspect;
 	}
 	occupied = v2_add(vr.size, scale_bar_area);
 	vr.pos   = v2_add(vr.pos, v2_scale(v2_sub(display_rect.size, occupied), 0.5));
 
 	Rectangle tex_r;
 	if (is_1d) {
 		tex_r  = (Rectangle){0, 0, view->colour_image.width, -view->colour_image.height};
 	} else {
 		v2 pixels_per_meter = {
 			.w = (f32)view->colour_image.width  / output_dim.w,
 			.h = (f32)view->colour_image.height / output_dim.h,
 		};
 
 		/* NOTE(rnp): math to resize the texture without stretching when the view changes
 		 * but the texture hasn't been (or cannot be) rebeamformed */
 		v2 texture_points  = v2_mul(pixels_per_meter, requested_dim);
 		v2 texture_start   = {
 			.x = pixels_per_meter.x * 0.5f * (output_dim.x - requested_dim.x),
 			.y = pixels_per_meter.y * (output_dim.y - requested_dim.y),
 		};
 
 		tex_r = (Rectangle){texture_start.x, texture_start.y, texture_points.x, texture_points.y};
 	}
 
 	NPatchInfo tex_np = { tex_r, 0, 0, 0, 0, NPATCH_NINE_PATCH };
 	DrawTextureNPatch(make_raylib_texture(view), tex_np, rl_rect(vr), (Vector2){0}, 0, WHITE);
 
 	v2 start_pos  = vr.pos;
 	start_pos.y  += vr.size.y;
 
 	if (vr.size.w > 0 && view->lateral_scale_bar_active->bool32) {
 		do_scale_bar(ui, a, &view->lateral_scale_bar, mouse,
 		             (Rect){.pos = start_pos, .size = vr.size},
 		             *view->lateral_scale_bar.scale_bar.min_value * 1e3f,
 		             *view->lateral_scale_bar.scale_bar.max_value * 1e3f, s8(" mm"));
 	}
 
 	start_pos    = vr.pos;
 	start_pos.x += vr.size.x;
 
 	if (vr.size.h > 0 && view->axial_scale_bar_active->bool32) {
 		if (is_1d) {
 			v2 end_pos = start_pos;
 			u32 tick_count  = (u32)(vr.size.y / (1.5f * (f32)ui->small_font.baseSize));
 			start_pos.y    += vr.size.y;
 			draw_ruler(ui, a, start_pos, end_pos, 0.0f, 1.0f, 0, 0, tick_count, s8(""), RULER_COLOUR, FG_COLOUR);
 		} else {
 			do_scale_bar(ui, a, &view->axial_scale_bar, mouse, (Rect){.pos = start_pos, .size = vr.size},
 			             *view->axial_scale_bar.scale_bar.max_value * 1e3f,
 			             *view->axial_scale_bar.scale_bar.min_value * 1e3f, s8(" mm"));
 		}
 	}
 
 	TextSpec text_spec = {.font = &ui->small_font, .flags = TF_LIMITED|TF_OUTLINED,
 	                      .colour = RULER_COLOUR, .outline_thick = 1, .outline_colour.a = 1,
 	                      .limits.size.x = vr.size.w};
 
 	f32 draw_table_width = vr.size.w;
 	/* NOTE: avoid hover_t modification */
 	Interaction viewer = auto_interaction(vr, var);
 	if (point_in_rect(mouse, viewer.rect)) {
 		ui->next_interaction = viewer;
 
 		v2 world = screen_point_to_world_2d(mouse, vr.pos, v2_add(vr.pos, vr.size),
 		                                    XZ(view->min_coordinate),
 		                                    XZ(view->max_coordinate));
 		world = v2_scale(world, 1e3f);
 
 		if (is_1d) world.y = ((vr.pos.y + vr.size.y) - mouse.y) / vr.size.y;
 
 		Stream buf = arena_stream(a);
 		stream_append_s8(&buf, s8("{"));
 		stream_append_f64(&buf, world.x, 100);
 		if (is_1d) stream_append_s8(&buf, s8(" mm"));
 		stream_append_s8(&buf, s8(", "));
 		stream_append_f64(&buf, world.y, 100);
 		stream_append_s8(&buf, s8("}"));
 
 		text_spec.limits.size.w -= 4.0f;
 		v2 txt_s = measure_text(*text_spec.font, stream_to_s8(&buf));
 		v2 txt_p = {
 			.x = vr.pos.x + vr.size.w - txt_s.w - 4.0f,
 			.y = vr.pos.y + vr.size.h - txt_s.h - 4.0f,
 		};
 		txt_p.x = Max(vr.pos.x, txt_p.x);
 		draw_table_width -= draw_text(stream_to_s8(&buf), txt_p, &text_spec).w;
 		text_spec.limits.size.w += 4.0f;
 	}
 
 	{
 		Stream buf = arena_stream(a);
 		s8 shader  = push_acquisition_kind(&buf, frame->acquisition_kind, frame->compound_count);
 		text_spec.font = &ui->font;
 		text_spec.limits.size.w -= 16;
 		v2 txt_s  = measure_text(*text_spec.font, shader);
 		v2 txt_p  = {
 			.x = vr.pos.x + vr.size.w - txt_s.w - 16,
 			.y = vr.pos.y + 4,
 		};
 		txt_p.x = Max(vr.pos.x, txt_p.x);
 		draw_text(stream_to_s8(&buf), txt_p, &text_spec);
 		text_spec.font = &ui->small_font;
 		text_spec.limits.size.w += 16;
 	}
 
 	if (view->ruler.state != RulerState_None) draw_view_ruler(view, a, vr, text_spec);
 
 	vr.size.w = draw_table_width;
 	draw_frame_view_controls(ui, a, view, vr, mouse);
 }
 
 function v2
 draw_compute_progress_bar(BeamformerUI *ui, ComputeProgressBar *state, Rect r)
 {
 	if (*state->processing) state->display_t_velocity += 65.0f * dt_for_frame;
 	else                    state->display_t_velocity -= 45.0f * dt_for_frame;
 
 	state->display_t_velocity = CLAMP(state->display_t_velocity, -10.0f, 10.0f);
 	state->display_t += state->display_t_velocity * dt_for_frame;
 	state->display_t  = CLAMP01(state->display_t);
 
 	if (state->display_t > (1.0f / 255.0f)) {
 		Rect outline = {.pos = r.pos, .size = {{r.size.w, (f32)ui->font.baseSize}}};
 		outline      = scale_rect_centered(outline, (v2){{0.96f, 0.7f}});
 		Rect filled  = outline;
 		filled.size.w *= *state->progress;
 		DrawRectangleRounded(rl_rect(filled), 2.0f, 0, fade(colour_from_normalized(HOVERED_COLOUR), state->display_t));
 		DrawRectangleRoundedLinesEx(rl_rect(outline), 2.0f, 0, 3, fade(BLACK, state->display_t));
 	}
 
 	v2 result = {{r.size.w, (f32)ui->font.baseSize}};
 	return result;
 }
 
 function s8
 push_compute_time(Arena *arena, s8 prefix, f32 time)
 {
 	Stream sb = arena_stream(*arena);
 	stream_append_s8(&sb, prefix);
 	stream_append_f64_e(&sb, time);
 	return arena_stream_commit(arena, &sb);
 }
 
 function v2
 draw_compute_stats_bar_view(BeamformerUI *ui, Arena arena, ComputeShaderStats *stats,
                             f32 compute_time_sum, TextSpec ts, Rect r, v2 mouse)
 {
 	read_only local_persist s8 frame_labels[] = {s8_comp("0:"), s8_comp("-1:"), s8_comp("-2:"), s8_comp("-3:")};
 	f32 total_times[countof(frame_labels)] = {0};
 
 	u32 stages = stats->table.shader_count;
 	Table *table = table_new(&arena, countof(frame_labels), TextAlignment_Right, TextAlignment_Left);
 	for (u32 i = 0; i < countof(frame_labels); i++) {
 		TableCell *cells = table_push_row(table, &arena, TRK_CELLS)->data;
 		cells[0].text = frame_labels[i];
 		u32 frame_index = (stats->latest_frame_index - i - 1) % countof(stats->table.times);
 		for (u32 j = 0; j < stages; j++)
 			total_times[i] += stats->table.times[frame_index][j];
 	}
 
 	v2 result = table_extent(table, arena, ts.font);
 
 	f32 remaining_width = r.size.w - result.w - table->cell_pad.w;
 	f32 average_width   = 0.8f * remaining_width;
 
 	s8 mouse_text = s8("");
 	v2 text_pos;
 
 	u32 row_index = 0;
 	TableIterator *it = table_iterator_new(table, TIK_ROWS, &arena, 0, r.pos, ts.font);
 	for (TableRow *row = table_iterator_next(it, &arena);
 	     row;
 	     row = table_iterator_next(it, &arena))
 	{
 		Rect cr   = it->cell_rect;
 		cr.size.w = table->widths[0];
 		ts.limits.size.w = cr.size.w;
 		draw_table_cell(ui, arena, (TableCell *)row->data, cr, table->alignment[0], ts, mouse);
 
 		u32 frame_index = (stats->latest_frame_index - row_index - 1) % countof(stats->table.times);
 		f32 total_width = average_width * total_times[row_index] / compute_time_sum;
 		Rect rect;
 		rect.pos  = v2_add(cr.pos, (v2){{cr.size.w + table->cell_pad.w , cr.size.h * 0.15f}});
 		rect.size = (v2){.y = 0.7f * cr.size.h};
 		for (u32 i = 0; i < stages; i++) {
 			rect.size.w = total_width * stats->table.times[frame_index][i] / total_times[row_index];
 			Color color = colour_from_normalized(g_colour_palette[i % countof(g_colour_palette)]);
 			DrawRectangleRec(rl_rect(rect), color);
 			if (point_in_rect(mouse, rect)) {
 				text_pos   = v2_add(rect.pos, (v2){.x = table->cell_pad.w});
 				s8 name    = push_s8_from_parts(&arena, s8(""), beamformer_shader_names[stats->table.shader_ids[i]], s8(": "));
 				mouse_text = push_compute_time(&arena, name, stats->table.times[frame_index][i]);
 			}
 			rect.pos.x += rect.size.w;
 		}
 		row_index++;
 	}
 
 	v2 start = v2_add(r.pos, (v2){.x = table->widths[0] + average_width + table->cell_pad.w});
 	v2 end   = v2_add(start, (v2){.y = result.y});
 	DrawLineEx(rl_v2(start), rl_v2(end), 4, colour_from_normalized(FG_COLOUR));
 
 	if (mouse_text.len) {
 		ts.font = &ui->small_font;
 		ts.flags &= ~(u32)TF_LIMITED;
 		ts.flags |=  (u32)TF_OUTLINED;
 		ts.outline_colour = (v4){.a = 1};
 		ts.outline_thick  = 1;
 		draw_text(mouse_text, text_pos, &ts);
 	}
 
 	return result;
 }
 
 function void
 push_table_time_row(Table *table, Arena *arena, s8 label, f32 time)
 {
 	assert(table->columns == 3);
 	TableCell *cells = table_push_row(table, arena, TRK_CELLS)->data;
 	cells[0].text = push_s8_from_parts(arena, s8(""), label, s8(":"));
 	cells[1].text = push_compute_time(arena, s8(""), time);
 	cells[2].text = s8("[s]");
 }
 
 function void
 push_table_time_row_with_fps(Table *table, Arena *arena, s8 label, f32 time)
 {
 	assert(table->columns == 3);
 	TableCell *cells = table_push_row(table, arena, TRK_CELLS)->data;
 
 	Stream sb = arena_stream(*arena);
 	stream_append_f64_e(&sb, time);
 	stream_append_s8(&sb, s8(" ("));
 	stream_append_f64(&sb, time > 0 ? 1.0f / time : 0, 100);
 	stream_append_s8(&sb, s8(")"));
 
 	cells[0].text = label;
 	cells[1].text = arena_stream_commit(arena, &sb);
 	cells[2].text = s8("[s] (FPS)");
 }
 
 function void
 push_table_memory_size_row(Table *table, Arena *arena, s8 label, u64 memory_size)
 {
 		TableCell *cells = table_push_row(table, arena, TRK_CELLS)->data;
 		Stream sb = arena_stream(*arena);
 		stream_append_u64(&sb, memory_size);
 		cells[0].text = label;
 		cells[1].text = arena_stream_commit(arena, &sb);
 		cells[2].text = s8("[B/F]");
 }
 
 function v2
 draw_compute_stats_view(BeamformerUI *ui, Arena arena, Variable *view, Rect r, v2 mouse)
 {
 	assert(view->type == VT_COMPUTE_STATS_VIEW);
 
 	read_only local_persist BeamformerComputePlan dummy_plan = {0};
 	u32 selected_plan = ui->selected_parameter_block % BeamformerMaxParameterBlocks;
 	BeamformerComputePlan *cp = ui->beamformer_context->compute_context.compute_plans[selected_plan];
 	if (!cp) cp = &dummy_plan;
 
 	ComputeStatsView   *csv   = &view->compute_stats_view;
 	ComputeShaderStats *stats = csv->compute_shader_stats;
 	f32 compute_time_sum = 0;
 	u32 stages           = stats->table.shader_count;
 	TextSpec text_spec   = {.font = &ui->font, .colour = FG_COLOUR, .flags = TF_LIMITED};
 
 	ui_blinker_update(&csv->blink, BLINK_SPEED);
 
 	for (u32 index = 0; index < stages; index++)
 		compute_time_sum += stats->average_times[index];
 
 	v2 result = {0};
 
 	Table *table = table_new(&arena, 2, TextAlignment_Left, TextAlignment_Left, TextAlignment_Left);
 	switch (csv->kind) {
 	case ComputeStatsViewKind_Average:{
 		da_reserve(&arena, table, stages);
 		for (u32 i = 0; i < stages; i++) {
 			push_table_time_row(table, &arena, beamformer_shader_names[stats->table.shader_ids[i]],
 			                    stats->average_times[i]);
 		}
 	}break;
 	case ComputeStatsViewKind_Bar:{
 		result = draw_compute_stats_bar_view(ui, arena, stats, compute_time_sum, text_spec, r, mouse);
 		r.pos = v2_add(r.pos, (v2){.y = result.y});
 	}break;
 	InvalidDefaultCase;
 	}
 
 	u32 rf_size = ui->beamformer_context->compute_context.rf_buffer.active_rf_size;
 	push_table_time_row_with_fps(table, &arena, s8("Compute Total:"),   compute_time_sum);
 	push_table_time_row_with_fps(table, &arena, s8("RF Upload Delta:"), stats->rf_time_delta_average);
 	push_table_memory_size_row(table, &arena, s8("Input RF Size:"), rf_size);
 	if (rf_size != cp->rf_size)
 		push_table_memory_size_row(table, &arena, s8("DAS RF Size:"), cp->rf_size);
 
 	result = v2_add(result, table_extent(table, arena, text_spec.font));
 
 	u32 row_index = 0;
 	TableIterator *it = table_iterator_new(table, TIK_ROWS, &arena, 0, r.pos, text_spec.font);
 	for (TableRow *row = table_iterator_next(it, &arena);
 	     row;
 	     row = table_iterator_next(it, &arena), row_index++)
 	{
 		Table *t = it->frame.table;
 		Rect cell_rect = it->cell_rect;
 		for (i32 column = 0; column < t->columns; column++) {
 			TableCell *cell = (TableCell *)it->row->data + column;
 			cell_rect.size.w = t->widths[column];
 			text_spec.limits.size.w = r.size.w - (cell_rect.pos.x - it->start_x);
 
 			if (column == 0 && row_index < stages &&
 			    vk_pipeline_valid(cp->vulkan_pipelines[row_index]) == 0 &&
 			    stats->table.shader_ids[row_index] != BeamformerShaderKind_Hilbert)
 			{
 				text_spec.colour = v4_lerp(FG_COLOUR, FOCUSED_COLOUR, ease_in_out_quartic(csv->blink.t));
 			} else {
 				text_spec.colour = FG_COLOUR;
 			}
 
 			draw_table_cell(ui, arena, cell, cell_rect, t->alignment[column], text_spec, mouse);
 
 			cell_rect.pos.x += cell_rect.size.w + t->cell_pad.w;
 		}
 	}
 
 	return result;
 }
 
 function v2
 draw_live_controls_view(BeamformerUI *ui, Variable *var, Rect r, v2 mouse, Arena arena)
 {
 	BeamformerLiveImagingParameters *lip = &ui->shared_memory->live_imaging_parameters;
 	BeamformerLiveControlsView      *lv  = var->generic;
 
 	TextSpec text_spec = {.font = &ui->font, .colour = FG_COLOUR, .flags = TF_LIMITED};
 
 	v2 slider_size = {{MIN(140.0f, r.size.w), (f32)ui->font.baseSize}};
 	v2 button_size = {{MIN(r.size.w, slider_size.x + (f32)ui->font.baseSize), (f32)ui->font.baseSize * 1.5f}};
 
 	f32 text_off   = r.pos.x + 0.5f * MAX(0, (r.size.w - slider_size.w - (f32)ui->font.baseSize));
 	f32 slider_off = r.pos.x + 0.5f * (r.size.w - slider_size.w);
 	f32 button_off = r.pos.x + 0.5f * (r.size.w - button_size.w);
 
 	text_spec.limits.size.w = r.size.w - (text_off - r.pos.x);
 
 	v2 at = {{text_off, r.pos.y}};
 
 	v4 hsv_power_slider = {{0.35f * ease_in_out_cubic(1.0f - lip->transmit_power), 0.65f, 0.65f, 1}};
 	at.y += draw_text(s8("Power:"), at, &text_spec).y;
 	at.x  = slider_off;
 	at.y += draw_variable_slider(ui, &lv->transmit_power, (Rect){.pos = at, .size = slider_size},
 	                             lip->transmit_power, hsv_to_rgb(hsv_power_slider), mouse);
 
 	at.x  = text_off;
 	at.y += draw_text(s8("TGC:"), at, &text_spec).y;
 	at.x  = slider_off;
 	for (u32 i = 0; i < countof(lip->tgc_control_points); i++) {
 		Variable *v = lv->tgc_control_points + i;
 		at.y += draw_variable_slider(ui, v, (Rect){.pos = at, .size = slider_size},
 		                             lip->tgc_control_points[i], g_colour_palette[1], mouse);
 
 		if (interaction_is_hot(ui, auto_interaction(r, v)))
 			lv->hot_field_flag = BeamformerLiveImagingDirtyFlags_TGCControlPoints;
 	}
 
 	at.x  = button_off;
 	at.y += (f32)ui->font.baseSize * 0.5f;
 	at.y += draw_fancy_button(ui, &lv->stop_button, lv->stop_button.name,
 	                          (Rect){.pos = at, .size = button_size},
 	                          BORDER_COLOUR, mouse, text_spec).y;
 
 	if (lip->save_enabled) {
 		b32 active = lip->save_active;
 		s8  label  = lv->save_button.cycler.labels[active % lv->save_button.cycler.cycle_length];
 
 		f32 save_t = ui_blinker_update(&lv->save_button_blink, BLINK_SPEED);
 		v4 border_colour = BORDER_COLOUR;
 		if (active) border_colour = v4_lerp(BORDER_COLOUR, FOCUSED_COLOUR, ease_in_out_cubic(save_t));
 
 		at.x  = text_off;
 		at.y += draw_text(s8("File Tag:"), at, &text_spec).y;
 		at.x += (f32)text_spec.font->baseSize / 2;
 		text_spec.limits.size.w -= (f32)text_spec.font->baseSize;
 
 		v4 save_text_colour = FG_COLOUR;
 		if (lip->save_name_tag_length <= 0)
 			save_text_colour.a = 0.6f;
 		at.y += draw_variable(ui, arena, &lv->save_text, at, mouse, save_text_colour, text_spec).y;
 		text_spec.limits.size.w += (f32)text_spec.font->baseSize;
 
 		at.x  = button_off;
 		at.y += (f32)ui->font.baseSize * 0.25f;
 		at.y += draw_fancy_button(ui, &lv->save_button, label, (Rect){.pos = at, .size = button_size},
 		                          border_colour, mouse, text_spec).y;
 
 		if (interaction_is_hot(ui, auto_interaction(r, &lv->save_text)))
 			lv->hot_field_flag = BeamformerLiveImagingDirtyFlags_SaveNameTag;
 		if (interaction_is_hot(ui, auto_interaction(r, &lv->save_button)))
 			lv->hot_field_flag = BeamformerLiveImagingDirtyFlags_SaveData;
 	}
 
 	if (interaction_is_hot(ui, auto_interaction(r, &lv->transmit_power)))
 		lv->hot_field_flag = BeamformerLiveImagingDirtyFlags_TransmitPower;
 	if (interaction_is_hot(ui, auto_interaction(r, &lv->stop_button)))
 		lv->hot_field_flag = BeamformerLiveImagingDirtyFlags_StopImaging;
 
 	v2 result = {{r.size.w, at.y - r.pos.y}};
 	return result;
 }
 
 struct variable_iterator { Variable *current; };
 function i32
 variable_iterator_next(struct variable_iterator *it)
 {
 	i32 result = 0;
 
 	if (it->current->type == VT_GROUP && it->current->group.expanded) {
 		it->current = it->current->group.first;
 		result++;
 	} else {
 		while (it->current) {
 			if (it->current->next) {
 				it->current = it->current->next;
 				break;
 			}
 			it->current = it->current->parent;
 			result--;
 		}
 	}
 
 	return result;
 }
 
 function v2
 draw_ui_view_menu(BeamformerUI *ui, Variable *group, Arena arena, Rect r, v2 mouse, TextSpec text_spec)
 {
 	assert(group->type == VT_GROUP);
 	Table *table = table_new(&arena, 0, TextAlignment_Left, TextAlignment_Right);
 	table->row_border_thick = 2.0f;
 	table->cell_pad         = (v2){{16.0f, 8.0f}};
 
 	i32 nesting = 0;
 	for (struct variable_iterator it = {group->group.first};
 	     it.current;
 	     nesting = variable_iterator_next(&it))
 	{
 		(void)nesting;
 		assert(nesting == 0);
 		Variable *var = it.current;
 		TableCell *cells = table_push_row(table, &arena, TRK_CELLS)->data;
 		switch (var->type) {
 		case VT_B32:
 		case VT_CYCLER:
 		{
 			cells[0] = (TableCell){.text = var->name};
 			cells[1] = table_variable_cell(&arena, var);
 		}break;
 		case VT_UI_BUTTON:{
 			cells[0] = (TableCell){.text = var->name, .kind = TableCellKind_Variable, .var = var};
 		}break;
 		InvalidDefaultCase;
 		}
 	}
 
 	r.size = table_extent(table, arena, text_spec.font);
 	return draw_table(ui, arena, table, r, text_spec, mouse, 0);
 }
 
 function v2
 draw_ui_view_listing(BeamformerUI *ui, Variable *group, Arena arena, Rect r, v2 mouse, TextSpec text_spec)
 {
 	assert(group->type == VT_GROUP);
 	Table *table = table_new(&arena, 0, TextAlignment_Left, TextAlignment_Left, TextAlignment_Right);
 
 	i32 nesting = 0;
 	for (struct variable_iterator it = {group->group.first};
 	     it.current;
 	     nesting = variable_iterator_next(&it))
 	{
 		while (nesting > 0) {
 			table = table_begin_subtable(table, &arena, TextAlignment_Left,
 			                             TextAlignment_Center, TextAlignment_Right);
 			nesting--;
 		}
 		while (nesting < 0) { table = table_end_subtable(table); nesting++; }
 
 		Variable *var = it.current;
 		switch (var->type) {
 		case VT_CYCLER:
 		case VT_BEAMFORMER_VARIABLE:
 		{
 			s8 suffix = s8("");
 			if (var->type == VT_BEAMFORMER_VARIABLE)
 				suffix = var->beamformer_variable.suffix;
 			table_push_parameter_row(table, &arena, var->name, var, suffix);
 		}break;
 		case VT_GROUP:{
 			VariableGroup *g = &var->group;
 
 			TableCell *cells = table_push_row(table, &arena, TRK_CELLS)->data;
 			cells[0] = (TableCell){.text = var->name, .kind = TableCellKind_Variable, .var = var};
 
 			if (!g->expanded) {
 				Stream sb = arena_stream(arena);
 				stream_append_variable_group(&sb, var);
 				cells[1].kind = TableCellKind_VariableGroup;
 				cells[1].text = arena_stream_commit(&arena, &sb);
 				cells[1].var  = var;
 
 				Variable *v = g->first;
 				assert(!v || v->type == VT_BEAMFORMER_VARIABLE);
 				/* NOTE(rnp): assume the suffix is the same for all elements */
 				if (v) cells[2].text = v->beamformer_variable.suffix;
 			}
 		}break;
 		InvalidDefaultCase;
 		}
 	}
 
 	v2 result = table_extent(table, arena, text_spec.font);
 	draw_table(ui, arena, table, r, text_spec, mouse, 0);
 	return result;
 }
 
 function Rect
 draw_ui_view_container(BeamformerUI *ui, Variable *var, v2 mouse, Rect bounds)
 {
 	UIView *fw = &var->view;
 	Rect result = fw->rect;
 	if (fw->rect.size.x > 0 && fw->rect.size.y > 0) {
 		f32 line_height = (f32)ui->small_font.baseSize;
 
 		f32 pad = MAX(line_height + 5.0f, UI_REGION_PAD);
 		if (fw->rect.pos.y < pad)
 			fw->rect.pos.y += pad - fw->rect.pos.y;
 		result = fw->rect;
 
 		f32 delta_x = (result.pos.x + result.size.x) - (bounds.size.x + bounds.pos.x);
 		if (delta_x > 0) {
 			result.pos.x -= delta_x;
 			result.pos.x  = MAX(0, result.pos.x);
 		}
 
 		Rect container = result;
 		if (fw->close) {
 			container.pos.y  -= 5 + line_height;
 			container.size.y += 2 + line_height;
 			Rect handle = {container.pos, (v2){.x = container.size.w, .y = 2 + line_height}};
 			Rect close;
 			hover_interaction(ui, mouse, auto_interaction(container, var));
 			cut_rect_horizontal(handle, handle.size.w - handle.size.h - 6, 0, &close);
 			close.size.w = close.size.h;
 			DrawRectangleRounded(rl_rect(handle), 0.1f, 0, colour_from_normalized(BG_COLOUR));
 			DrawRectangleRoundedLinesEx(rl_rect(handle), 0.2f, 0, 2, BLACK);
 			draw_close_button(ui, fw->close, mouse, close, (v2){{0.45f, 0.45f}});
 		} else {
 			hover_interaction(ui, mouse, auto_interaction(container, var));
 		}
 		f32 roundness = 12.0f / fw->rect.size.y;
 		DrawRectangleRounded(rl_rect(result), roundness / 2.0f, 0, colour_from_normalized(BG_COLOUR));
 		DrawRectangleRoundedLinesEx(rl_rect(result), roundness, 0, 2, BLACK);
 	}
 	return result;
 }
 
 function void
 draw_ui_view(BeamformerUI *ui, Variable *ui_view, Rect r, v2 mouse, TextSpec text_spec)
 {
 	assert(ui_view->type == VT_UI_VIEW || ui_view->type == VT_UI_MENU || ui_view->type == VT_UI_TEXT_BOX);
 
 	UIView *view = &ui_view->view;
 
 	if (view->flags & UIViewFlag_Floating) {
 		r = draw_ui_view_container(ui, ui_view, mouse, r);
 	} else {
 		if (view->rect.size.h - r.size.h < view->rect.pos.h)
 			view->rect.pos.h = view->rect.size.h - r.size.h;
 
 		if (view->rect.size.h - r.size.h < 0)
 			view->rect.pos.h = 0;
 
 		r.pos.y -= view->rect.pos.h;
 	}
 
 	v2 size = {0};
 
 	Variable *var = view->child;
 	switch (var->type) {
 	case VT_GROUP:{
 		if (ui_view->type == VT_UI_MENU)
 			size = draw_ui_view_menu(ui, var, ui->arena, r, mouse, text_spec);
 		else {
 			size = draw_ui_view_listing(ui, var, ui->arena, r, mouse, text_spec);
 		}
 	}break;
 	case VT_BEAMFORMER_FRAME_VIEW: {
 		BeamformerFrameView *bv = var->generic;
 		if (frame_view_ready_to_present(ui, bv)) {
 			if (bv->kind == BeamformerFrameViewKind_3DXPlane)
 				draw_3D_xplane_frame_view(ui, ui->arena, var, r, mouse);
 			else
 				draw_beamformer_frame_view(ui, ui->arena, var, r, mouse);
 		}
 	} break;
 	case VT_COMPUTE_PROGRESS_BAR: {
 		size = draw_compute_progress_bar(ui, &var->compute_progress_bar, r);
 	} break;
 	case VT_COMPUTE_STATS_VIEW:{ size = draw_compute_stats_view(ui, ui->arena, var, r, mouse); }break;
 	case VT_LIVE_CONTROLS_VIEW:{
 		if (view->rect.size.h - r.size.h < 0)
 			r.pos.y += 0.5f * (r.size.h - view->rect.size.h);
 		if (ui->shared_memory->live_imaging_parameters.active)
 			size = draw_live_controls_view(ui, var, r, mouse, ui->arena);
 	}break;
 	InvalidDefaultCase;
 	}
 
 	view->rect.size = size;
 }
 
 function void
 draw_layout_variable(BeamformerUI *ui, Variable *var, Rect draw_rect, v2 mouse)
 {
 	if (var->type != VT_UI_REGION_SPLIT) {
 		v2 shrink = {.x = UI_REGION_PAD, .y = UI_REGION_PAD};
 		draw_rect = shrink_rect_centered(draw_rect, shrink);
 		draw_rect.size = v2_floor(draw_rect.size);
 		BeginScissorMode((i32)draw_rect.pos.x, (i32)draw_rect.pos.y, (i32)draw_rect.size.w, (i32)draw_rect.size.h);
 		draw_rect = draw_title_bar(ui, ui->arena, var, draw_rect, mouse);
 		EndScissorMode();
 	}
 
 	/* TODO(rnp): post order traversal of the ui tree will remove the need for this */
 	if (!CheckCollisionPointRec(rl_v2(mouse), rl_rect(draw_rect)))
 		mouse = (v2){.x = F32_INFINITY, .y = F32_INFINITY};
 
 	draw_rect.size = v2_floor(draw_rect.size);
 	BeginScissorMode((i32)draw_rect.pos.x, (i32)draw_rect.pos.y, (i32)draw_rect.size.w, (i32)draw_rect.size.h);
 	switch (var->type) {
 	case VT_UI_VIEW: {
 		hover_interaction(ui, mouse, auto_interaction(draw_rect, var));
 		TextSpec text_spec = {.font = &ui->font, .colour = FG_COLOUR, .flags = TF_LIMITED};
 		draw_ui_view(ui, var, draw_rect, mouse, text_spec);
 	} break;
 	case VT_UI_REGION_SPLIT: {
 		RegionSplit *rs = &var->region_split;
 
 		Rect split = {0}, hover = {0};
 		switch (rs->direction) {
 		case RSD_VERTICAL: {
 			split_rect_vertical(draw_rect, rs->fraction, 0, &split);
 			split.pos.x  += UI_REGION_PAD;
 			split.pos.y  -= UI_SPLIT_HANDLE_THICK / 2;
 			split.size.h  = UI_SPLIT_HANDLE_THICK;
 			split.size.w -= 2 * UI_REGION_PAD;
 			hover = extend_rect_centered(split, (v2){.y = 0.75f * UI_REGION_PAD});
 		} break;
 		case RSD_HORIZONTAL: {
 			split_rect_horizontal(draw_rect, rs->fraction, 0, &split);
 			split.pos.x  -= UI_SPLIT_HANDLE_THICK / 2;
 			split.pos.y  += UI_REGION_PAD;
 			split.size.w  = UI_SPLIT_HANDLE_THICK;
 			split.size.h -= 2 * UI_REGION_PAD;
 			hover = extend_rect_centered(split, (v2){.x = 0.75f * UI_REGION_PAD});
 		} break;
 		}
 
 		Interaction drag = {.kind = InteractionKind_Drag, .rect = hover, .var = var};
 		hover_interaction(ui, mouse, drag);
 
 		v4 colour = HOVERED_COLOUR;
 		colour.a  = var->hover_t;
 		DrawRectangleRounded(rl_rect(split), 0.6f, 0, colour_from_normalized(colour));
 	} break;
 	InvalidDefaultCase;
 	}
 	EndScissorMode();
 }
 
 function void
 draw_ui_regions(BeamformerUI *ui, Rect window, v2 mouse)
 {
 	struct region_frame {
 		Variable *var;
 		Rect      rect;
 	} init[16];
 
 	struct {
 		struct region_frame *data;
 		da_count             count;
 		da_count             capacity;
 	} stack = {init, 0, countof(init)};
 
 	TempArena arena_savepoint = begin_temp_arena(&ui->arena);
 
 	*da_push(&ui->arena, &stack) = (struct region_frame){ui->regions, window};
 	while (stack.count) {
 		struct region_frame *top = stack.data + --stack.count;
 		Rect rect = top->rect;
 		draw_layout_variable(ui, top->var, rect, mouse);
 
 		if (top->var->type == VT_UI_REGION_SPLIT) {
 			Rect first, second;
 			RegionSplit *rs = &top->var->region_split;
 			switch (rs->direction) {
 			case RSD_VERTICAL: {
 				split_rect_vertical(rect, rs->fraction, &first, &second);
 			} break;
 			case RSD_HORIZONTAL: {
 				split_rect_horizontal(rect, rs->fraction, &first, &second);
 			} break;
 			}
 
 			*da_push(&ui->arena, &stack) = (struct region_frame){rs->right, second};
 			*da_push(&ui->arena, &stack) = (struct region_frame){rs->left,  first};
 		}
 	}
 
 	end_temp_arena(arena_savepoint);
 }
 
 function void
 draw_floating_widgets(BeamformerUI *ui, Rect window_rect, v2 mouse)
 {
 	TextSpec text_spec = {.font = &ui->small_font, .colour = FG_COLOUR};
 	window_rect = shrink_rect_centered(window_rect, (v2){{UI_REGION_PAD, UI_REGION_PAD}});
 	for (Variable *var = ui->floating_widget_sentinal.parent;
 	     var != &ui->floating_widget_sentinal;
 	     var = var->parent)
 	{
 		if (var->type == VT_UI_TEXT_BOX) {
 			UIView *fw = &var->view;
 			InputState *is = &ui->text_input_state;
 
 			draw_ui_view_container(ui, var, mouse, fw->rect);
 
 			f32 cursor_width = (is->cursor == is->count) ? 0.55f * (f32)is->font->baseSize : 4.0f;
 			s8 text      = {.len = is->count, .data = is->buf};
 			v2 text_size = measure_text(*is->font, text);
 
 			f32 text_pad = 4.0f;
 			f32 desired_width = text_pad + text_size.w + cursor_width;
 			fw->rect.size = (v2){{MAX(desired_width, fw->rect.size.w), text_size.h + text_pad}};
 
 			v2 text_position   = {{fw->rect.pos.x + text_pad / 2, fw->rect.pos.y + text_pad / 2}};
 			f32 cursor_offset  = measure_text(*is->font, (s8){is->cursor, text.data}).w;
 			cursor_offset     += text_position.x;
 
 			Rect cursor;
 			cursor.pos  = (v2){{cursor_offset, text_position.y}};
 			cursor.size = (v2){{cursor_width,  text_size.h}};
 
 			v4 cursor_colour = FOCUSED_COLOUR;
 			cursor_colour.a  = ease_in_out_cubic(is->cursor_blink.t);
 			v4 text_colour   = v4_lerp(FG_COLOUR, HOVERED_COLOUR, fw->child->hover_t);
 
 			TextSpec input_text_spec = {.font = is->font, .colour = text_colour};
 			draw_text(text, text_position, &input_text_spec);
 			DrawRectanglePro(rl_rect(cursor), (Vector2){0}, 0, colour_from_normalized(cursor_colour));
 		} else {
 			draw_ui_view(ui, var, window_rect, mouse, text_spec);
 		}
 	}
 }
 
 function void
 scroll_interaction(Variable *var, f32 delta)
 {
 	switch (var->type) {
 	case VT_B32:{ var->bool32  = !var->bool32; }break;
 	case VT_F32:{ var->real32 += delta;        }break;
 	case VT_I32:{ var->signed32 += (i32)delta; }break;
 	case VT_SCALED_F32:{ var->scaled_real32.val += delta * var->scaled_real32.scale; }break;
 	case VT_BEAMFORMER_FRAME_VIEW:{
 		BeamformerFrameView *bv = var->generic;
 		bv->threshold.real32 += delta;
 		bv->dirty = 1;
 	} break;
 	case VT_BEAMFORMER_VARIABLE:{
 		BeamformerVariable *bv = &var->beamformer_variable;
 		f32 value  = *bv->store + delta * bv->scroll_scale;
 		*bv->store = Clamp(value, bv->limits.x, bv->limits.y);
 	}break;
 	case VT_CYCLER:{
 		u32 new_state = *var->cycler.state += delta;
 		*var->cycler.state = new_state % var->cycler.cycle_length;
 	}break;
 	case VT_UI_VIEW:{
 		var->view.rect.pos.h += UI_SCROLL_SPEED * delta;
 		var->view.rect.pos.h  = MAX(0, var->view.rect.pos.h);
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function void
 begin_text_input(InputState *is, Rect r, Variable *container, v2 mouse)
 {
 	assert(container->type == VT_UI_TEXT_BOX);
 	Font *font = is->font = is->hot_font;
 	Stream s = {.cap = countof(is->buf), .data = is->buf};
 	stream_append_variable(&s, container->view.child);
 	is->count = s.widx;
 	is->container = container;
 
 	is->numeric = container->view.child->type != VT_LIVE_CONTROLS_STRING;
 	if (container->view.child->type == VT_LIVE_CONTROLS_STRING) {
 		BeamformerLiveImagingParameters *lip = container->view.child->generic;
 		if (lip->save_name_tag_length <= 0)
 			is->count = 0;
 	}
 
 	/* NOTE: extra offset to help with putting a cursor at idx 0 */
 	f32 text_half_char_width = 10.0f;
 	f32 hover_p = CLAMP01((mouse.x - r.pos.x) / r.size.w);
 	i32 i;
 	f32 x_off = text_half_char_width, x_bounds = r.size.w * hover_p;
 	for (i = 0; i < is->count && x_off < x_bounds; i++) {
 		/* NOTE: assumes font glyphs are ordered ASCII */
 		i32 idx  = is->buf[i] - 0x20;
 		x_off   += (f32)font->glyphs[idx].advanceX;
 		if (font->glyphs[idx].advanceX == 0)
 			x_off += font->recs[idx].width;
 	}
 	is->cursor = i;
 }
 
 function void
 end_text_input(InputState *is, Variable *var)
 {
 	f32 value = 0;
 	if (is->numeric) {
 		NumberConversion number = number_from_s8((s8){.len = is->count, .data = is->buf});
 		value = number.F64;
 	}
 
 	switch (var->type) {
 	case VT_SCALED_F32:{ var->scaled_real32.val = value; }break;
 	case VT_F32:{        var->real32            = value; }break;
 	case VT_BEAMFORMER_VARIABLE:{
 		BeamformerVariable *bv = &var->beamformer_variable;
 		*bv->store = CLAMP(value / bv->display_scale, bv->limits.x, bv->limits.y);
 		var->hover_t = 0;
 	}break;
 	case VT_LIVE_CONTROLS_STRING:{
 		BeamformerLiveImagingParameters *lip = var->generic;
 		mem_copy(lip->save_name_tag, is->buf, (uz)is->count % countof(lip->save_name_tag));
 		lip->save_name_tag_length = is->count % countof(lip->save_name_tag);
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function b32
 update_text_input(InputState *is, Variable *var)
 {
 	assert(is->cursor != -1);
 
 	ui_blinker_update(&is->cursor_blink, BLINK_SPEED);
 
 	var->hover_t -= 2 * HOVER_SPEED * dt_for_frame;
 	var->hover_t  = CLAMP01(var->hover_t);
 
 	/* NOTE: handle multiple input keys on a single frame */
 	for (i32 key = GetCharPressed();
 	     is->count < countof(is->buf) && key > 0;
 	     key = GetCharPressed())
 	{
 		b32 allow_key = !is->numeric || (BETWEEN(key, '0', '9') || (key == '.') ||
 		                 (key == '-' && is->cursor == 0));
 		if (allow_key) {
 			memory_move(is->buf + is->cursor + 1,
 			            is->buf + is->cursor,
 			            (uz)(is->count - is->cursor));
 			is->buf[is->cursor++] = (u8)key;
 			is->count++;
 		}
 	}
 
 	is->cursor -= (IsKeyPressed(KEY_LEFT)  || IsKeyPressedRepeat(KEY_LEFT))  && is->cursor > 0;
 	is->cursor += (IsKeyPressed(KEY_RIGHT) || IsKeyPressedRepeat(KEY_RIGHT)) && is->cursor < is->count;
 
 	if ((IsKeyPressed(KEY_BACKSPACE) || IsKeyPressedRepeat(KEY_BACKSPACE)) && is->cursor > 0) {
 		is->cursor--;
 		if (is->cursor < countof(is->buf) - 1) {
 			memory_move(is->buf + is->cursor,
 			            is->buf + is->cursor + 1,
 			            (uz)(is->count - is->cursor - 1));
 		}
 		is->count--;
 	}
 
 	if ((IsKeyPressed(KEY_DELETE) || IsKeyPressedRepeat(KEY_DELETE)) && is->cursor < is->count) {
 		memory_move(is->buf + is->cursor,
 		            is->buf + is->cursor + 1,
 		            (uz)(is->count - is->cursor - 1));
 		is->count--;
 	}
 
 	b32 result = IsKeyPressed(KEY_ENTER);
 	return result;
 }
 
 function void
 scale_bar_interaction(BeamformerUI *ui, ScaleBar *sb, v2 mouse)
 {
 	Interaction *it = &ui->interaction;
 	b32 mouse_left_pressed  = IsMouseButtonPressed(MOUSE_BUTTON_LEFT);
 	b32 mouse_right_pressed = IsMouseButtonPressed(MOUSE_BUTTON_RIGHT);
 	f32 mouse_wheel         = GetMouseWheelMoveV().y;
 
 	if (mouse_left_pressed) {
 		v2 world_mouse = screen_point_to_world_2d(mouse, it->rect.pos,
 		                                          v2_add(it->rect.pos, it->rect.size),
 		                                          (v2){{*sb->min_value, *sb->min_value}},
 		                                          (v2){{*sb->max_value, *sb->max_value}});
 		f32 new_coord = F32_INFINITY;
 		switch (sb->direction) {
 		case SB_LATERAL: new_coord = world_mouse.x; break;
 		case SB_AXIAL:   new_coord = world_mouse.y; break;
 		}
 		if (sb->zoom_starting_coord == F32_INFINITY) {
 			sb->zoom_starting_coord = new_coord;
 		} else {
 			f32 min = sb->zoom_starting_coord;
 			f32 max = new_coord;
 			if (min > max) swap(min, max);
 
 			v2_sll *savepoint = SLLPopFreelist(ui->scale_bar_savepoint_freelist);
 			if (!savepoint) savepoint = push_struct(&ui->arena, v2_sll);
 
 			savepoint->v.x = *sb->min_value;
 			savepoint->v.y = *sb->max_value;
 			SLLPush(savepoint, sb->savepoint_stack);
 
 			*sb->min_value = min;
 			*sb->max_value = max;
 
 			sb->zoom_starting_coord = F32_INFINITY;
 		}
 	}
 
 	if (mouse_right_pressed) {
 		v2_sll *savepoint = sb->savepoint_stack;
 		if (savepoint) {
 			*sb->min_value      = savepoint->v.x;
 			*sb->max_value      = savepoint->v.y;
 			sb->savepoint_stack = savepoint->next;
 			SLLPushFreelist(savepoint, ui->scale_bar_savepoint_freelist);
 		}
 		sb->zoom_starting_coord = F32_INFINITY;
 	}
 
 	if (mouse_wheel != 0) {
 		*sb->min_value += mouse_wheel * sb->scroll_scale.x;
 		*sb->max_value += mouse_wheel * sb->scroll_scale.y;
 	}
 }
 
 function void
 ui_widget_bring_to_front(Variable *sentinal, Variable *widget)
 {
 	/* TODO(rnp): clean up the linkage so this can be a macro */
 	widget->parent->next = widget->next;
 	widget->next->parent = widget->parent;
 
 	widget->parent = sentinal;
 	widget->next   = sentinal->next;
 	widget->next->parent = widget;
 	sentinal->next = widget;
 }
 
 function void
 ui_view_close(BeamformerUI *ui, Variable *view)
 {
 	switch (view->type) {
 	case VT_UI_MENU:
 	case VT_UI_TEXT_BOX:
 	{
 		UIView *fw = &view->view;
 		if (view->type == VT_UI_MENU) {
 			assert(fw->child->type == VT_GROUP);
 			fw->child->group.expanded  = 0;
 			fw->child->group.container = 0;
 		} else {
 			end_text_input(&ui->text_input_state, fw->child);
 		}
 		view->parent->next = view->next;
 		view->next->parent = view->parent;
 		if (fw->close) SLLPushFreelist(fw->close, ui->variable_freelist);
 		SLLPushFreelist(view, ui->variable_freelist);
 	}break;
 	case VT_UI_VIEW:{
 		assert(view->parent->type == VT_UI_REGION_SPLIT);
 		Variable *region = view->parent;
 
 		Variable *parent    = region->parent;
 		Variable *remaining = region->region_split.left;
 		if (remaining == view) remaining = region->region_split.right;
 
 		ui_view_free(ui, view);
 
 		assert(parent->type == VT_UI_REGION_SPLIT);
 		if (parent->region_split.left == region) {
 			parent->region_split.left  = remaining;
 		} else {
 			parent->region_split.right = remaining;
 		}
 		remaining->parent = parent;
 
 		SLLPushFreelist(region, ui->variable_freelist);
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function void
 ui_button_interaction(BeamformerUI *ui, Variable *button)
 {
 	assert(button->type == VT_UI_BUTTON);
 	switch (button->button) {
 	case UI_BID_VIEW_CLOSE:{ ui_view_close(ui, button->parent); }break;
 	case UI_BID_FV_COPY_HORIZONTAL:{
 		ui_copy_frame(ui, button->parent->parent, RSD_HORIZONTAL);
 	}break;
 	case UI_BID_FV_COPY_VERTICAL:{
 		ui_copy_frame(ui, button->parent->parent, RSD_VERTICAL);
 	}break;
 	case UI_BID_GM_OPEN_VIEW_RIGHT:{
 		ui_add_live_frame_view(ui, button->parent->parent, RSD_HORIZONTAL, BeamformerFrameViewKind_Latest);
 	}break;
 	case UI_BID_GM_OPEN_VIEW_BELOW:{
 		ui_add_live_frame_view(ui, button->parent->parent, RSD_VERTICAL, BeamformerFrameViewKind_Latest);
 	}break;
 	}
 }
 
 function void
 ui_begin_interact(BeamformerUI *ui, v2 mouse, b32 scroll)
 {
 	Interaction hot = ui->hot_interaction;
 	if (hot.kind != InteractionKind_None) {
 		if (hot.kind == InteractionKind_Auto) {
 			switch (hot.var->type) {
 			case VT_NULL:{ hot.kind = InteractionKind_Nop; }break;
 			case VT_B32:{ hot.kind  = InteractionKind_Set; }break;
 			case VT_SCALE_BAR:{ hot.kind = InteractionKind_Set; }break;
 			case VT_UI_BUTTON:{ hot.kind = InteractionKind_Button; }break;
 			case VT_GROUP:{ hot.kind = InteractionKind_Set; }break;
 			case VT_UI_TEXT_BOX:
 			case VT_UI_MENU:
 			{
 				if (hot.var->type == VT_UI_MENU) {
 					hot.kind = InteractionKind_Drag;
 				} else {
 					hot.kind = InteractionKind_Text;
 					begin_text_input(&ui->text_input_state, hot.rect, hot.var, mouse);
 				}
 				ui_widget_bring_to_front(&ui->floating_widget_sentinal, hot.var);
 
 				// TODO(rnp): hack. this won't be needed with a proper immediate mode UI
 				if (ui->interaction.kind == InteractionKind_Text)
 					hot.var = hot.var->view.child;
 			}break;
 			case VT_UI_VIEW:{
 				if (scroll) hot.kind = InteractionKind_Scroll;
 				else        hot.kind = InteractionKind_Nop;
 			}break;
 			case VT_X_PLANE_SHIFT:{
 				assert(hot.var->parent && hot.var->parent->type == VT_BEAMFORMER_FRAME_VIEW);
 				BeamformerFrameView *bv = hot.var->parent->generic;
 				if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) {
 					XPlaneShift *xp = &hot.var->x_plane_shift;
 					xp->start_point = xp->end_point = bv->hit_test_point;
 					hot.kind = InteractionKind_Drag;
 				} else {
 					if (scroll) {
 						hot.kind = InteractionKind_Scroll;
 						hot.var  = &bv->threshold;
 					} else {
 						hot.kind = InteractionKind_Nop;
 					}
 				}
 			}break;
 			case VT_BEAMFORMER_FRAME_VIEW:{
 				if (scroll) {
 					hot.kind = InteractionKind_Scroll;
 				} else {
 					BeamformerFrameView *bv = hot.var->generic;
 					switch (bv->kind) {
 					case BeamformerFrameViewKind_3DXPlane:{ hot.kind = InteractionKind_Drag; }break;
 					default:{
 						hot.kind = InteractionKind_Nop;
 						switch (++bv->ruler.state) {
 						case RulerState_Start:{
 							hot.kind = InteractionKind_Ruler;
 							bv->ruler.start = world_point_from_plane_uv(bv->frame.voxel_transform,
 							                                            rect_uv(mouse, hot.rect));
 						}break;
 						case RulerState_Hold:{}break;
 						default:{ bv->ruler.state = RulerState_None; }break;
 						}
 					}break;
 					}
 				}
 			}break;
 			case VT_CYCLER:{
 				if (scroll) hot.kind = InteractionKind_Scroll;
 				else        hot.kind = InteractionKind_Set;
 			}break;
 			case VT_BEAMFORMER_VARIABLE:
 			case VT_LIVE_CONTROLS_STRING:
 			case VT_F32:
 			case VT_SCALED_F32:
 			{
 				if (scroll) {
 					hot.kind = InteractionKind_Scroll;
 				} else if (hot.var->flags & V_TEXT) {
 					hot.kind = InteractionKind_Text;
 					Variable *w = add_floating_view(ui, &ui->arena, VT_UI_TEXT_BOX,
 					                                hot.rect.pos, hot.var, 0);
 					w->view.rect = hot.rect;
 					begin_text_input(&ui->text_input_state, hot.rect, w, mouse);
 				} else {
 					hot.kind = InteractionKind_Drag;
 				}
 			}break;
 			InvalidDefaultCase;
 			}
 		}
 
 		ui->interaction = hot;
 
 		if (ui->interaction.var->flags & V_LIVE_CONTROL) {
 			assert(ui->interaction.var->parent->type == VT_LIVE_CONTROLS_VIEW);
 			BeamformerLiveControlsView *lv = ui->interaction.var->parent->generic;
 			lv->active_field_flag = lv->hot_field_flag;
 		}
 
 		if (ui->interaction.var->flags & V_HIDES_CURSOR) {
 			HideCursor();
 			DisableCursor();
 			/* wtf raylib */
 			SetMousePosition((i32)mouse.x, (i32)mouse.y);
 		}
 	} else {
 		ui->interaction.kind = InteractionKind_Nop;
 	}
 }
 
 function u32
 ui_cycler_delta_for_frame(void)
 {
 	u32 result = (u32)GetMouseWheelMoveV().y;
 	if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))  result += 1;
 	if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT)) result -= 1;
 	return result;
 }
 
 function void
 ui_extra_actions(BeamformerUI *ui, Variable *var)
 {
 	switch (var->type) {
 	case VT_CYCLER:{
 		assert(var->parent && var->parent->parent && var->parent->parent->type == VT_UI_VIEW);
 		Variable *view_var = var->parent->parent;
 		UIView   *view     = &view_var->view;
 		switch (view->child->type) {
 		case VT_BEAMFORMER_FRAME_VIEW:{
 			u32 delta = ui_cycler_delta_for_frame();
 			BeamformerFrameView *old = view->child->generic;
 			view->child->generic = ui_beamformer_frame_view_new(ui, &ui->arena);
 			BeamformerFrameViewKind last_kind = ((u32)old->kind - delta) % BeamformerFrameViewKind_Count;
 
 			/* NOTE(rnp): log_scale gets released below before its needed */
 			b32 log_scale = old->log_scale->bool32;
 			ui_variable_free_group_items(ui, view->menu);
 
 			ui_beamformer_frame_view_release_subresources(ui, old, last_kind);
 			ui_beamformer_frame_view_convert(ui, &ui->arena, view->child, view->menu, old->kind, old, log_scale);
 
 			DLLRemove(0, old->next, old->prev, old, next, prev);
 			SLLPushFreelist(old, ui->view_freelist);
 		}break;
 		InvalidDefaultCase;
 		}
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function void
 ui_live_control_update(BeamformerUI *ui, Variable *controls)
 {
 	assert(controls->type == VT_LIVE_CONTROLS_VIEW);
 	BeamformerLiveControlsView *lv = controls->generic;
 	atomic_or_u32(&ui->shared_memory->live_imaging_dirty_flags, lv->active_field_flag);
 }
 
 function void
 ui_end_interact(BeamformerUI *ui, v2 mouse)
 {
 	Interaction *it = &ui->interaction;
 	Variable *parent = it->var->parent;
 	u32 flags = it->var->flags;
 
 	switch (it->kind) {
 	case InteractionKind_Nop:{}break;
 	case InteractionKind_Drag:{
 		switch (it->var->type) {
 		case VT_X_PLANE_SHIFT:{
 			assert(parent && parent->type == VT_BEAMFORMER_FRAME_VIEW);
 			XPlaneShift *xp = &it->var->x_plane_shift;
 			BeamformerFrameView *view = parent->generic;
 			BeamformerViewPlaneTag plane = view_plane_tag_from_x_plane_shift(view, it->var);
 			f32 rotation  = x_plane_rotation_for_view_plane(view, plane);
 			m4 x_rotation = m4_rotation_about_y(rotation);
 			v3 Z = x_rotation.c[2].xyz;
 			f32 delta = v3_dot(Z, v3_sub(xp->end_point, xp->start_point));
 			xp->start_point = xp->end_point;
 
 			BeamformerSharedMemory *          sm = ui->shared_memory;
 			BeamformerLiveImagingParameters * li = &sm->live_imaging_parameters;
 			li->image_plane_offsets[plane] += delta;
 			atomic_or_u32(&sm->live_imaging_dirty_flags, BeamformerLiveImagingDirtyFlags_ImagePlaneOffsets);
 		}break;
 		default:{}break;
 		}
 	}break;
 	case InteractionKind_Set:{
 		switch (it->var->type) {
 		case VT_B32:{ it->var->bool32 = !it->var->bool32; }break;
 		case VT_GROUP:{ it->var->group.expanded = !it->var->group.expanded; }break;
 		case VT_SCALE_BAR:{ scale_bar_interaction(ui, &it->var->scale_bar, mouse); }break;
 		case VT_CYCLER:{
 			*it->var->cycler.state += ui_cycler_delta_for_frame();
 			*it->var->cycler.state %= it->var->cycler.cycle_length;
 		}break;
 		InvalidDefaultCase;
 		}
 	}break;
 	case InteractionKind_Menu:{
 		assert(it->var->type == VT_GROUP);
 		VariableGroup *g = &it->var->group;
 		if (g->container) {
 			ui_widget_bring_to_front(&ui->floating_widget_sentinal, g->container);
 		} else {
 			g->container = add_floating_view(ui, &ui->arena, VT_UI_MENU, mouse, it->var, 1);
 		}
 	}break;
 	case InteractionKind_Ruler:{
 		assert(it->var->type == VT_BEAMFORMER_FRAME_VIEW);
 		((BeamformerFrameView *)it->var->generic)->ruler.state = RulerState_None;
 	}break;
 	case InteractionKind_Button:{ ui_button_interaction(ui, it->var); }break;
 	case InteractionKind_Scroll:{ scroll_interaction(it->var, GetMouseWheelMoveV().y); }break;
 	case InteractionKind_Text:{ ui_view_close(ui, ui->text_input_state.container); }break;
 	InvalidDefaultCase;
 	}
 
 	if (flags & V_CAUSES_COMPUTE)
 		ui->flush_params = 1;
 
 	if (flags & V_UPDATE_VIEW) {
 		BeamformerFrameView *frame = parent->generic;
 		/* TODO(rnp): more straight forward way of achieving this */
 		if (parent->type != VT_BEAMFORMER_FRAME_VIEW) {
 			assert(parent->parent->type == VT_UI_VIEW);
 			assert(parent->parent->view.child->type == VT_BEAMFORMER_FRAME_VIEW);
 			frame = parent->parent->view.child->generic;
 		}
 		frame->dirty = 1;
 	}
 
 	if (flags & V_LIVE_CONTROL)
 		ui_live_control_update(ui, it->var->parent);
 
 	if (flags & V_HIDES_CURSOR)
 		EnableCursor();
 
 	if (flags & V_EXTRA_ACTION)
 		ui_extra_actions(ui, it->var);
 
 	ui->interaction = (Interaction){.kind = InteractionKind_None};
 }
 
 function void
 ui_sticky_interaction_check_end(BeamformerUI *ui, v2 mouse)
 {
 	Interaction *it = &ui->interaction;
 	switch (it->kind) {
 	case InteractionKind_Ruler:{
 		if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT) || !point_in_rect(mouse, it->rect))
 			ui_end_interact(ui, mouse);
 	}break;
 	case InteractionKind_Text:{
 		Interaction text_box = auto_interaction({0}, ui->text_input_state.container);
 		if (!interactions_equal(text_box, ui->hot_interaction))
 			ui_end_interact(ui, mouse);
 	}break;
 	InvalidDefaultCase;
 	}
 }
 
 function void
 ui_interact(BeamformerUI *ui, BeamformerInput *input, Rect window_rect)
 {
 	v2 input_mouse = {{input->mouse_x, input->mouse_y}};
 	Interaction *it = &ui->interaction;
 	if (it->kind == InteractionKind_None || interaction_is_sticky(*it)) {
 		ui->hot_interaction = ui->next_interaction;
 
 		b32 mouse_left_pressed  = IsMouseButtonPressed(MOUSE_BUTTON_LEFT);
 		b32 mouse_right_pressed = IsMouseButtonPressed(MOUSE_BUTTON_RIGHT);
 		b32 wheel_moved         = GetMouseWheelMoveV().y != 0;
 		if (mouse_right_pressed || mouse_left_pressed || wheel_moved) {
 			if (it->kind != InteractionKind_None)
 				ui_sticky_interaction_check_end(ui, input_mouse);
 			ui_begin_interact(ui, input_mouse, wheel_moved);
 		}
 	}
 
 	switch (it->kind) {
 	case InteractionKind_Nop:{ it->kind = InteractionKind_None; }break;
 	case InteractionKind_None:{}break;
 	case InteractionKind_Text:{
 		if (update_text_input(&ui->text_input_state, it->var))
 			ui_end_interact(ui, input_mouse);
 	}break;
 	case InteractionKind_Ruler:{
 		assert(it->var->type == VT_BEAMFORMER_FRAME_VIEW);
 		BeamformerFrameView *bv = it->var->generic;
 		v2 mouse = clamp_v2_rect(input_mouse, it->rect);
 		bv->ruler.end = world_point_from_plane_uv(bv->frame.voxel_transform, rect_uv(mouse, it->rect));
 	}break;
 	case InteractionKind_Drag:{
 		if (!IsMouseButtonDown(MOUSE_BUTTON_LEFT) && !IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) {
 			ui_end_interact(ui, input_mouse);
 		} else {
 			v2 ws     = window_rect.size;
 			v2 dMouse = v2_sub(input_mouse, ui->last_mouse);
 
 			switch (it->var->type) {
 			case VT_BEAMFORMER_VARIABLE:{
 				BeamformerVariable *bv = &it->var->beamformer_variable;
 				/* TODO(rnp): vertical sliders? */
 				f32 mouse_frac = CLAMP01((input_mouse.x - it->rect.pos.x) / it->rect.size.w);
 				*bv->store     = bv->limits.x + mouse_frac * (bv->limits.y - bv->limits.x);
 			}break;
 			case VT_X_PLANE_SHIFT:{
 				assert(it->var->parent && it->var->parent->type == VT_BEAMFORMER_FRAME_VIEW);
 				v2 mouse = clamp_v2_rect(input_mouse, it->rect);
 				XPlaneShift *xp = &it->var->x_plane_shift;
 				ray mouse_ray = ray_for_x_plane_view(ui, it->var->parent->generic,
 				                                     normalized_p_in_rect(it->rect, mouse, 0));
 				/* NOTE(rnp): project start point onto ray */
 				v3 s = v3_sub(xp->start_point, mouse_ray.origin);
 				v3 r = v3_sub(mouse_ray.direction, mouse_ray.origin);
 				f32 scale     = v3_dot(s, r) / v3_magnitude_squared(r);
 				xp->end_point = v3_add(mouse_ray.origin, v3_scale(r, scale));
 			}break;
 			case VT_BEAMFORMER_FRAME_VIEW:{
 				BeamformerFrameView *bv = it->var->generic;
 				switch (bv->kind) {
 				case BeamformerFrameViewKind_3DXPlane:{
 					bv->rotation -= dMouse.x / ws.w;
 					if (bv->rotation > 1.0f) bv->rotation -= 1.0f;
 					if (bv->rotation < 0.0f) bv->rotation += 1.0f;
 				}break;
 				InvalidDefaultCase;
 				}
 			}break;
 			case VT_UI_MENU:{
 				v2 *pos = &ui->interaction.var->view.rect.pos;
 				*pos = clamp_v2_rect(v2_add(*pos, dMouse), window_rect);
 			}break;
 			case VT_UI_REGION_SPLIT:{
 				f32 min_fraction = 0;
 				dMouse = v2_mul(dMouse, (v2){{1.0f / ws.w, 1.0f / ws.h}});
 				RegionSplit *rs = &ui->interaction.var->region_split;
 				switch (rs->direction) {
 				case RSD_VERTICAL: {
 					min_fraction  = (UI_SPLIT_HANDLE_THICK + 0.5f * UI_REGION_PAD) / ws.h;
 					rs->fraction += dMouse.y;
 				} break;
 				case RSD_HORIZONTAL: {
 					min_fraction  = (UI_SPLIT_HANDLE_THICK + 0.5f * UI_REGION_PAD) / ws.w;
 					rs->fraction += dMouse.x;
 				} break;
 				}
 				rs->fraction = CLAMP(rs->fraction, min_fraction, 1 - min_fraction);
 			}break;
 			default:{}break;
 			}
 			if (it->var->flags & V_LIVE_CONTROL)
 				ui_live_control_update(ui, it->var->parent);
 		}
 	} break;
 	default:{ ui_end_interact(ui, input_mouse); }break;
 	}
 
 	ui->next_interaction = (Interaction){.kind = InteractionKind_None};
 }
 
 /* NOTE(rnp): this only exists to make asan less annoying. do not waste
  * people's time by freeing, closing, etc... */
 DEBUG_EXPORT BEAMFORMER_DEBUG_UI_DEINIT_FN(beamformer_debug_ui_deinit)
 {
 #if ASAN_ACTIVE
 	BeamformerUI *ui = ctx->ui;
 	UnloadFont(ui->font);
 	UnloadFont(ui->small_font);
 	CloseWindow();
 #endif
 }
 
 function void
 ui_init(BeamformerCtx *ctx, Arena store)
 {
 	BeamformerUI *ui = ctx->ui;
 	if (!ui) {
 		ui = ctx->ui = push_struct(&store, typeof(*ui));
 		ui->arena = store;
 		ui->shared_memory   = ctx->shared_memory;
 		ui->beamformer_context = ctx;
 
 		/* TODO(rnp): better font, this one is jank at small sizes */
 		ui->font       = LoadFontFromMemory(".ttf", beamformer_base_font, sizeof(beamformer_base_font), 28, 0, 0);
 		ui->small_font = LoadFontFromMemory(".ttf", beamformer_base_font, sizeof(beamformer_base_font), 20, 0, 0);
 
 		ui->floating_widget_sentinal.parent = &ui->floating_widget_sentinal;
 		ui->floating_widget_sentinal.next   = &ui->floating_widget_sentinal;
 
 		Variable *split = ui->regions = add_ui_split(ui, 0, &ui->arena, s8("UI Root"), 0.36f,
 		                                             RSD_HORIZONTAL, ui->font);
 		split->region_split.left = add_ui_split(ui, split, &ui->arena, s8(""), 0.475f,
 		                                        RSD_VERTICAL, ui->font);
 
 		split = split->region_split.right = add_ui_split(ui, split, &ui->arena, s8(""), 0.70f,
 		                                                 RSD_HORIZONTAL, ui->font);
 		{
 			split->region_split.left  = add_beamformer_frame_view(ui, split, &ui->arena,
 			                                                      BeamformerFrameViewKind_Latest, 0, 0);
 			split->region_split.right = add_live_controls_view(ui, split, &ui->arena);
 		}
 		split = split->parent;
 
 		split = split->region_split.left;
 		split->region_split.left  = add_beamformer_parameters_view(split, ctx);
 		split->region_split.right = add_ui_split(ui, split, &ui->arena, s8(""), 0.22f,
 		                                         RSD_VERTICAL, ui->font);
 		split = split->region_split.right;
 
 		split->region_split.left  = add_compute_progress_bar(split, ctx);
 		split->region_split.right = add_compute_stats_view(ui, split, &ui->arena, ctx);
 
 		u32 samples = vk_gpu_info()->max_msaa_samples;
 		vk_image_allocate(&ui->render_3d_image,       FRAME_VIEW_RENDER_TARGET_SIZE, 1, samples, VulkanImageUsage_Colour,       0, 0, s8("Render Target Colour"));
 		vk_image_allocate(&ui->render_3d_depth_image, FRAME_VIEW_RENDER_TARGET_SIZE, 1, samples, VulkanImageUsage_DepthStencil, 0, 0, s8("Render Target Depth"));
 
 		glGenSemaphoresEXT(countof(ui->render_semaphores_gl), ui->render_semaphores_gl);
 		for EachElement(ui->render_semaphores, it)
 			ui->render_semaphores[it] = vk_create_semaphore(ui->render_semaphores_export + it);
 
 		if (OS_WINDOWS) {
 			glImportSemaphoreWin32HandleEXT(ui->render_semaphores_gl[0], GL_HANDLE_TYPE_OPAQUE_WIN32_EXT, (void *)ui->render_semaphores_export[0].value[0]);
 			glImportSemaphoreWin32HandleEXT(ui->render_semaphores_gl[1], GL_HANDLE_TYPE_OPAQUE_WIN32_EXT, (void *)ui->render_semaphores_export[1].value[0]);
 		} else {
 			glImportSemaphoreFdEXT(ui->render_semaphores_gl[0], GL_HANDLE_TYPE_OPAQUE_FD_EXT, ui->render_semaphores_export[0].value[0]);
 			glImportSemaphoreFdEXT(ui->render_semaphores_gl[1], GL_HANDLE_TYPE_OPAQUE_FD_EXT, ui->render_semaphores_export[1].value[0]);
 			ui->render_semaphores_export[0].value[0] = OSInvalidHandleValue;
 			ui->render_semaphores_export[1].value[0] = OSInvalidHandleValue;
 		}
 
 		if (!BakeShaders)
 		{
 			for EachElement(beamformer_reloadable_render_shader_info_indices, it) {
 				i32 index = beamformer_reloadable_render_shader_info_indices[it];
 				for (u32 i = 0; i < 2; i++) {
 					BeamformerFileReloadContext *frc = push_struct(&ui->arena, typeof(*frc));
 					frc->kind                   = BeamformerFileReloadKind_RenderShader;
 					frc->shader_reload.shader   = beamformer_reloadable_shader_kinds[index];
 					frc->shader_reload.pipeline = ui->pipelines + it;
 
 					Arena scratch = ui->arena;
 					s8 file = push_s8_from_parts(&scratch, os_path_separator(), s8("shaders"),
 					                             beamformer_reloadable_shader_files[index][i]);
 
 					os_add_file_watch((char *)file.data, file.len, frc);
 				}
 			}
 		}
 
 		f32 unit_cube_vertices[] = {
 			 0.5f,  0.5f, -0.5f, 0.0f,
 			 0.5f,  0.5f, -0.5f, 0.0f,
 			 0.5f,  0.5f, -0.5f, 0.0f,
 			 0.5f, -0.5f, -0.5f, 0.0f,
 			 0.5f, -0.5f, -0.5f, 0.0f,
 			 0.5f, -0.5f, -0.5f, 0.0f,
 			 0.5f,  0.5f,  0.5f, 0.0f,
 			 0.5f,  0.5f,  0.5f, 0.0f,
 			 0.5f,  0.5f,  0.5f, 0.0f,
 			 0.5f, -0.5f,  0.5f, 0.0f,
 			 0.5f, -0.5f,  0.5f, 0.0f,
 			 0.5f, -0.5f,  0.5f, 0.0f,
 			-0.5f,  0.5f, -0.5f, 0.0f,
 			-0.5f,  0.5f, -0.5f, 0.0f,
 			-0.5f,  0.5f, -0.5f, 0.0f,
 			-0.5f, -0.5f, -0.5f, 0.0f,
 			-0.5f, -0.5f, -0.5f, 0.0f,
 			-0.5f, -0.5f, -0.5f, 0.0f,
 			-0.5f,  0.5f,  0.5f, 0.0f,
 			-0.5f,  0.5f,  0.5f, 0.0f,
 			-0.5f,  0.5f,  0.5f, 0.0f,
 			-0.5f, -0.5f,  0.5f, 0.0f,
 			-0.5f, -0.5f,  0.5f, 0.0f,
 			-0.5f, -0.5f,  0.5f, 0.0f,
 		};
 		f32 unit_cube_normals[] = {
 			 0.0f,  0.0f, -1.0f, 0.0f,
 			 0.0f,  1.0f,  0.0f, 0.0f,
 			 1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f, -1.0f, 0.0f,
 			 0.0f, -1.0f,  0.0f, 0.0f,
 			 1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f,  1.0f, 0.0f,
 			 0.0f,  1.0f,  0.0f, 0.0f,
 			 1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f,  1.0f, 0.0f,
 			 0.0f, -1.0f,  0.0f, 0.0f,
 			 1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f, -1.0f, 0.0f,
 			 0.0f,  1.0f,  0.0f, 0.0f,
 			-1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f, -1.0f, 0.0f,
 			 0.0f, -1.0f,  0.0f, 0.0f,
 			-1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f,  1.0f, 0.0f,
 			 0.0f,  1.0f,  0.0f, 0.0f,
 			-1.0f,  0.0f,  0.0f, 0.0f,
 			 0.0f,  0.0f,  1.0f, 0.0f,
 			 0.0f, -1.0f,  0.0f, 0.0f,
 			-1.0f,  0.0f,  0.0f, 0.0f,
 		};
 		u16 unit_cube_indices[] = {
 			1,  13, 19,
 			1,  19, 7,
 			9,  6,  18,
 			9,  18, 21,
 			23, 20, 14,
 			23, 14, 17,
 			16, 4,  10,
 			16, 10, 22,
 			5,  2,  8,
 			5,  8,  11,
 			15, 12, 0,
 			15, 0,  3
 		};
 
 		static_assert(countof(unit_cube_normals) == countof(unit_cube_vertices), "");
 
 		RenderModel *rm = &ui->unit_cube_model;
 		rm->vertex_count   = countof(unit_cube_vertices) / 4;
 		rm->normals_offset = round_up_to(sizeof(unit_cube_vertices), 16);
 
 		u64 model_size = 2 * round_up_to(sizeof(unit_cube_vertices), 16);
 		vk_render_model_allocate(&rm->model, unit_cube_indices, countof(unit_cube_indices), model_size, s8("unit_cube_model"));
 		vk_render_model_range_upload(&rm->model, unit_cube_vertices, 0,                  sizeof(unit_cube_vertices), 0);
 		vk_render_model_range_upload(&rm->model, unit_cube_normals,  rm->normals_offset, sizeof(unit_cube_normals),  0);
 
 		/* NOTE(rnp): shrink variable size once this fires */
 		assert((uz)(ui->arena.beg - (u8 *)ui) < KB(64));
 	}
 
 	for EachElement(beamformer_reloadable_render_shader_info_indices, it) {
 		i32 index = beamformer_reloadable_render_shader_info_indices[it];
 		BeamformerShaderKind shader = beamformer_reloadable_shader_kinds[index];
 		beamformer_reload_render_pipeline(ui->pipelines + it, shader, ui->arena);
 	}
 }
 
 function void
 validate_ui_parameters(BeamformerUI *ui)
 {
 	if (ui->min_coordinate.x > ui->max_coordinate.x)
 		swap(ui->min_coordinate.x, ui->max_coordinate.x);
 	if (ui->min_coordinate.y > ui->max_coordinate.y)
 		swap(ui->min_coordinate.y, ui->max_coordinate.y);
 }
 
 function void
 draw_ui(BeamformerCtx *ctx, BeamformerInput *input, BeamformerFrame *frame_to_draw, BeamformerViewPlaneTag frame_plane)
 {
 	BeamformerUI *ui = ctx->ui;
 
 	if (frame_to_draw) {
 		mem_copy(ui->latest_plane + BeamformerViewPlaneTag_Count, frame_to_draw, sizeof(*frame_to_draw));
 		mem_copy(ui->latest_plane + frame_plane,                  frame_to_draw, sizeof(*frame_to_draw));
 		ui->latest_plane_valid[BeamformerViewPlaneTag_Count] = 1;
 		ui->latest_plane_valid[frame_plane]                  = 1;
 	} else {
 		ui->latest_plane_valid[BeamformerViewPlaneTag_Count] = 0;
 		ui->latest_plane_valid[frame_plane]                  = 0;
 	}
 
 	asan_poison_region(ui->arena.beg, ui->arena.end - ui->arena.beg);
 
 	u32 selected_block = ui->selected_parameter_block % BeamformerMaxParameterBlocks;
 	u32 selected_mask  = 1 << selected_block;
 	if (ctx->ui_dirty_parameter_blocks & selected_mask) {
 		BeamformerParameterBlock *pb = beamformer_parameter_block_lock(ui->shared_memory, selected_block, 0);
 		if (pb) {
 			ui->flush_params = 0;
 
 			m4 das_transform;
 			mem_copy(&ui->params, &pb->parameters_ui, sizeof(ui->params));
 			mem_copy(das_transform.E, pb->parameters.das_voxel_transform.E, sizeof(das_transform));
 
 			atomic_and_u32(&ctx->ui_dirty_parameter_blocks, ~selected_mask);
 			beamformer_parameter_block_unlock(ui->shared_memory, selected_block);
 
 			BeamformerComputePlan *cp = ui->beamformer_context->compute_context.compute_plans[selected_block];
 			m4 identity = m4_identity();
 			b32 recompute = !m4_equal(identity, cp->ui_voxel_transform);
 			mem_copy(cp->ui_voxel_transform.E, identity.E, sizeof(identity));
 
 			if (recompute) {
 				mark_parameter_block_region_dirty(ui->shared_memory, selected_block,
 				                                  BeamformerParameterBlockRegion_Parameters);
 				beamformer_queue_compute(ctx, frame_to_draw, selected_block);
 			}
 
 			v3 U = v3_normalize(das_transform.c[0].xyz);
 			v3 V = v3_normalize(das_transform.c[1].xyz);
 			v3 N = cross(V, U);
 
 			ui->off_axis_position = v3_dot(N, das_transform.c[3].xyz);
 			ui->beamform_plane    = 0;
 
 			v3 min_coordinate = m4_mul_v3(das_transform, (v3){{0.0f, 0.0f, 0.0f}});
 			v3 max_coordinate = m4_mul_v3(das_transform, (v3){{1.0f, 1.0f, 1.0f}});
 
 			ui->min_coordinate.x = v3_dot(U, min_coordinate);
 			ui->min_coordinate.y = v3_dot(V, min_coordinate);
 
 			ui->max_coordinate.x = v3_dot(U, max_coordinate);
 			ui->max_coordinate.y = v3_dot(V, max_coordinate);
 		}
 	}
 
 	/* NOTE: process interactions first because the user interacted with
 	 * the ui that was presented last frame */
 	Rect window_rect = {.size = {{(f32)ctx->window_size.w, (f32)ctx->window_size.h}}};
 	ui_interact(ui, input, window_rect);
 
 	if (ui->flush_params) {
 		validate_ui_parameters(ui);
 		if (ctx->latest_frame) {
 			BeamformerParameterBlock *pb = beamformer_parameter_block_lock(ui->shared_memory, selected_block, 0);
 			if (pb) {
 				ui->flush_params = 0;
 
 				iv3 points    = ctx->latest_frame->points;
 				i32 dimension = iv3_dimension(points);
 
 				// TODO(rnp): this is immediate mode code that should be in the ui building code
 				m4 new_transform = m4_identity();
 				switch (dimension) {
 				case 1:{}break;
 
 				case 2:{
 					v3 U = v3_normalize(pb->parameters.das_voxel_transform.c[0].xyz);
 					v3 V = v3_normalize(pb->parameters.das_voxel_transform.c[1].xyz);
 					v3 N = cross(V, U);
 
 					new_transform = das_transform_2d_with_normal(N, ui->min_coordinate, ui->max_coordinate, 0);
 
 					v3 rotation_axis = cross(v3_normalize(new_transform.c[0].xyz), N);
 
 					m4 R = m4_rotation_about_axis(rotation_axis, ui->beamform_plane);
 					m4 T = m4_translation(v3_scale(m4_mul_v3(R, N), ui->off_axis_position));
 
 					new_transform = m4_mul(m4_mul(T, m4_mul(R, new_transform)),
 					                       m4_inverse(pb->parameters.das_voxel_transform));
 				}break;
 
 				case 3:{}break;
 				}
 
 				// TODO(rnp): super janky code because of the retained mode parameters list.
 				// when this code is run in the correct place we can just decide inline
 				b32 recompute = !memory_equal(&pb->parameters_ui, &ui->params, sizeof(ui->params));
 				BeamformerComputePlan *cp = ui->beamformer_context->compute_context.compute_plans[selected_block];
 				if (cp) {
 					recompute |= !m4_equal(new_transform, cp->ui_voxel_transform);
 					mem_copy(cp->ui_voxel_transform.E, new_transform.E, sizeof(new_transform));
 				}
 
 				mem_copy(&pb->parameters_ui, &ui->params, sizeof(ui->params));
 
 				mark_parameter_block_region_dirty(ui->shared_memory, selected_block,
 				                                  BeamformerParameterBlockRegion_Parameters);
 				beamformer_parameter_block_unlock(ui->shared_memory, selected_block);
 
 				if (recompute)
 					beamformer_queue_compute(ctx, frame_to_draw, selected_block);
 			}
 		}
 	}
 
 	/* NOTE(rnp): can't render to a different framebuffer in the middle of BeginDrawing()... */
 	update_frame_views(ui, window_rect);
 
 	BeginDrawing();
 		v2 mouse = {{input->mouse_x, input->mouse_y}};
 		glClearNamedFramebufferfv(0, GL_COLOR, 0, BG_COLOUR.E);
 		glClearNamedFramebufferfv(0, GL_DEPTH, 0, (f32 []){1});
 
 		draw_ui_regions(ui, window_rect, mouse);
 		draw_floating_widgets(ui, window_rect, mouse);
 	EndDrawing();
 
 	ui->last_mouse = (v2){{input->mouse_x, input->mouse_y}};
 }