ogl_beamforming

ogl_beamformer_lib.c (20771B)

---

 /* See LICENSE for license details. */
 #include "../compiler.h"
 
 #include "../util.h"
 #include "../beamformer_parameters.h"
 #include "ogl_beamformer_lib_base.h"
 
 #if OS_LINUX
 #include "../os_linux.c"
 #elif OS_WINDOWS
 #include "../os_win32.c"
 
 W32(iptr) OpenFileMappingA(u32, b32, c8 *);
 
 #else
 #error Unsupported Platform
 #endif
 
 #include "../beamformer_shared_memory.c"
 
 global struct {
 	SharedMemoryRegion      shared_memory;
 	BeamformerSharedMemory *bp;
 	i32                     timeout_ms;
 	BeamformerLibErrorKind  last_error;
 } g_beamformer_library_context;
 
 #if OS_LINUX
 
 function b32
 os_reserve_region_locks(iptr os_context, u32 count)
 {
 	b32 result = count <= BeamformerMaxParameterBlockSlots;
 	return result;
 }
 
 function SharedMemoryRegion
 os_open_shared_memory_area(char *name)
 {
 	SharedMemoryRegion result = {0};
 	i32 fd = shm_open(name, O_RDWR, S_IRUSR|S_IWUSR);
 	if (fd > 0) {
 		void *new = mmap(0, BEAMFORMER_SHARED_MEMORY_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
 		if (new != MAP_FAILED) result.region = new;
 		close(fd);
 	}
 	return result;
 }
 
 #elif OS_WINDOWS
 
 function b32
 os_reserve_region_locks(iptr os_context, u32 count)
 {
 	local_persist iptr semaphores[BeamformerSharedMemoryLockKind_Count + BeamformerMaxParameterBlockSlots];
 	w32_shared_memory_context *ctx = (typeof(ctx))os_context;
 
 	b32 result = count <= BeamformerMaxParameterBlockSlots;
 	if (result) {
 		count += BeamformerSharedMemoryLockKind_Count;
 		if (count > ctx->reserved_count) {
 			u8 buffer[1024];
 			Stream sb = {.data = buffer, .cap = countof(buffer)};
 			stream_append_s8(&sb, s8(OS_SHARED_MEMORY_NAME "_lock_"));
 
 			for (u32 i = ctx->reserved_count; i < count; i++) {
 				Stream lb = sb;
 				stream_append_u64(&lb, i);
 				stream_append_byte(&lb, 0);
 				semaphores[i]  = CreateSemaphoreA(0, 1, 1, (c8 *)lb.data);
 				result        &= semaphores[i] != INVALID_FILE;
 			}
 
 			if (result) {
 				ctx->semaphores     = semaphores;
 				ctx->reserved_count = count;
 			}
 		} else if (count < ctx->reserved_count) {
 			for (u32 i = ctx->reserved_count; i >= count;)
 				CloseHandle(semaphores[--i]);
 			ctx->reserved_count = count;
 		}
 	}
 	return result;
 }
 
 function SharedMemoryRegion
 os_open_shared_memory_area(char *name)
 {
 	local_persist w32_shared_memory_context ctx = {0};
 	SharedMemoryRegion result = {0};
 	iptr h = OpenFileMappingA(FILE_MAP_ALL_ACCESS, 0, name);
 	if (h != INVALID_FILE) {
 		void *new = MapViewOfFile(h, FILE_MAP_ALL_ACCESS, 0, 0, BEAMFORMER_SHARED_MEMORY_SIZE);
 		if (new && os_reserve_region_locks((iptr)&ctx, 1)) {
 			result.region     = new;
 			result.os_context = (iptr)&ctx;
 		}
 		CloseHandle(h);
 	}
 	return result;
 }
 
 #endif
 
 function b32
 lib_error_check(b32 condition, BeamformerLibErrorKind error_kind)
 {
 	b32 result = condition;
 	if (!result) g_beamformer_library_context.last_error = error_kind;
 	return result;
 }
 
 function b32
 check_shared_memory(void)
 {
 	if (!g_beamformer_library_context.shared_memory.region) {
 		g_beamformer_library_context.shared_memory = os_open_shared_memory_area(OS_SHARED_MEMORY_NAME);
 		if (lib_error_check(g_beamformer_library_context.shared_memory.region != 0, BF_LIB_ERR_KIND_SHARED_MEMORY)) {
 			u32 version = ((BeamformerSharedMemory *)g_beamformer_library_context.shared_memory.region)->version;
 			if (lib_error_check(version == BEAMFORMER_SHARED_MEMORY_VERSION, BF_LIB_ERR_KIND_VERSION_MISMATCH))
 				g_beamformer_library_context.bp = g_beamformer_library_context.shared_memory.region;
 		}
 	}
 
 	b32 result = 0;
 	if (g_beamformer_library_context.bp)
 		result = lib_error_check(!g_beamformer_library_context.bp->invalid, BF_LIB_ERR_KIND_INVALID_ACCESS);
 	return result;
 }
 
 function b32
 valid_parameter_block(u32 block)
 {
 	b32 result = check_shared_memory();
 	if (result) {
 		result = lib_error_check(block < g_beamformer_library_context.bp->reserved_parameter_blocks,
 		                         BF_LIB_ERR_KIND_PARAMETER_BLOCK_UNALLOCATED);
 	}
 	return result;
 }
 
 function BeamformWork *
 try_push_work_queue(void)
 {
 	BeamformWork *result = beamform_work_queue_push(&g_beamformer_library_context.bp->external_work_queue);
 	lib_error_check(result != 0, BF_LIB_ERR_KIND_WORK_QUEUE_FULL);
 	return result;
 }
 
 function b32
 lib_try_lock(i32 lock, i32 timeout_ms)
 {
 	b32 result = os_shared_memory_region_lock(&g_beamformer_library_context.shared_memory,
 	                                          g_beamformer_library_context.bp->locks,
 	                                          lock, (u32)timeout_ms);
 	lib_error_check(result, BF_LIB_ERR_KIND_SYNC_VARIABLE);
 	return result;
 }
 
 function void
 lib_release_lock(i32 lock)
 {
 	os_shared_memory_region_unlock(&g_beamformer_library_context.shared_memory,
 	                               g_beamformer_library_context.bp->locks, (i32)lock);
 }
 
 u32
 beamformer_get_api_version(void)
 {
 	return BEAMFORMER_SHARED_MEMORY_VERSION;
 }
 
 const char *
 beamformer_error_string(BeamformerLibErrorKind kind)
 {
 	#define X(type, num, string) string,
 	local_persist const char *error_string_table[] = {BEAMFORMER_LIB_ERRORS "invalid error kind"};
 	#undef X
 	return error_string_table[MIN(kind, countof(error_string_table) - 1)];
 }
 
 BeamformerLibErrorKind
 beamformer_get_last_error(void)
 {
 	return g_beamformer_library_context.last_error;
 }
 
 const char *
 beamformer_get_last_error_string(void)
 {
 	return beamformer_error_string(beamformer_get_last_error());
 }
 
 b32
 beamformer_set_global_timeout(i32 timeout_ms)
 {
 	b32 result = lib_error_check(timeout_ms >= -1, BF_LIB_ERR_KIND_INVALID_TIMEOUT);
 	if (result) g_beamformer_library_context.timeout_ms = timeout_ms;
 	return result;
 }
 
 b32
 beamformer_reserve_parameter_blocks(uint32_t count)
 {
 	b32 result = 0;
 	if (check_shared_memory() &&
 	    lib_error_check(os_reserve_region_locks(g_beamformer_library_context.shared_memory.os_context, count),
 	                    BF_LIB_ERR_KIND_PARAMETER_BLOCK_OVERFLOW))
 	{
 		u32 old_count = g_beamformer_library_context.bp->reserved_parameter_blocks;
 		g_beamformer_library_context.bp->reserved_parameter_blocks = count;
 		for (u32 i = old_count; i < count; i++)
 			zero_struct(beamformer_parameter_block(g_beamformer_library_context.bp, i));
 		result = 1;
 	}
 	return result;
 }
 
 function b32
 validate_pipeline(i32 *shaders, u32 shader_count, BeamformerDataKind data_kind)
 {
 	b32 result = 1;
 	if (lib_error_check(shader_count <= BeamformerMaxComputeShaderStages,
 	                    BF_LIB_ERR_KIND_COMPUTE_STAGE_OVERFLOW))
 	{
 		for (u32 i = 0; i < shader_count; i++)
 			result &= BETWEEN(shaders[i], 0, BeamformerShaderKind_ComputeCount);
 		if (!result) {
 			g_beamformer_library_context.last_error = BF_LIB_ERR_KIND_INVALID_COMPUTE_STAGE;
 		} else if (shaders[0] != BeamformerShaderKind_Demodulate &&
 		           shaders[0] != BeamformerShaderKind_Decode)
 		{
 			g_beamformer_library_context.last_error = BF_LIB_ERR_KIND_INVALID_START_SHADER;
 			result = 0;
 		} else if (shaders[0] == BeamformerShaderKind_Demodulate &&
 		           !(data_kind == BeamformerDataKind_Int16 || data_kind == BeamformerDataKind_Float32))
 		{
 			g_beamformer_library_context.last_error = BF_LIB_ERR_KIND_INVALID_DEMOD_DATA_KIND;
 			result = 0;
 		}
 	}
 	return result;
 }
 
 function b32
 parameter_block_region_upload_explicit(void *data, u32 size, u32 block, BeamformerParameterBlockRegions region_id,
                                        u32 block_offset, i32 timeout_ms)
 {
 	i32 lock   = BeamformerSharedMemoryLockKind_Count + (i32)block;
 	b32 result = valid_parameter_block(block) && lib_try_lock(lock, timeout_ms);
 	if (result) {
 		mem_copy((u8 *)beamformer_parameter_block(g_beamformer_library_context.bp, block) + block_offset,
 		         data, size);
 		mark_parameter_block_region_dirty(g_beamformer_library_context.bp, block, region_id);
 		lib_release_lock(lock);
 	}
 	return result;
 }
 
 
 function b32
 parameter_block_region_upload(void *data, u32 size, u32 block,
                               BeamformerParameterBlockRegions region_id, i32 timeout_ms)
 {
 	assert(region_id < BeamformerParameterBlockRegion_Count);
 	b32 result = parameter_block_region_upload_explicit(data, size, block, region_id,
 	                                                    BeamformerParameterBlockRegionOffsets[region_id],
 	                                                    timeout_ms);
 	return result;
 }
 
 b32
 beamformer_set_pipeline_stage_parameters_at(u32 stage_index, i32 parameter, u32 block)
 {
 	u32 offset  = BeamformerParameterBlockRegionOffsets[BeamformerParameterBlockRegion_ComputePipeline];
 	offset     += offsetof(BeamformerComputePipeline, parameters);
 	offset     += (stage_index % BeamformerMaxComputeShaderStages) * sizeof(BeamformerShaderParameters);
 	b32 result  = parameter_block_region_upload_explicit(&parameter, sizeof(BeamformerShaderParameters), block,
 	                                                     BeamformerParameterBlockRegion_ComputePipeline, offset,
 	                                                     g_beamformer_library_context.timeout_ms);
 	return result;
 }
 
 b32
 beamformer_set_pipeline_stage_parameters(u32 stage_index, i32 parameter)
 {
 	b32 result = beamformer_set_pipeline_stage_parameters_at(stage_index, parameter, 0);
 	return result;
 }
 
 b32
 beamformer_push_pipeline_at(i32 *shaders, u32 shader_count, BeamformerDataKind data_kind, u32 block)
 {
 	b32 result = 0;
 	if (validate_pipeline(shaders, shader_count, data_kind)) {
 		i32 lock = BeamformerSharedMemoryLockKind_Count + (i32)block;
 		if (valid_parameter_block(block) && lib_try_lock(lock, g_beamformer_library_context.timeout_ms)) {
 			BeamformerParameterBlock *b = beamformer_parameter_block(g_beamformer_library_context.bp, block);
 			mem_copy(&b->pipeline.shaders, shaders, shader_count * sizeof(*shaders));
 			mark_parameter_block_region_dirty(g_beamformer_library_context.bp, block,
 			                                  BeamformerParameterBlockRegion_ComputePipeline);
 			b->pipeline.shader_count = shader_count;
 			b->pipeline.data_kind    = data_kind;
 			lib_release_lock(lock);
 			result = 1;
 		}
 	}
 	return result;
 }
 
 b32
 beamformer_push_pipeline(i32 *shaders, u32 shader_count, BeamformerDataKind data_kind)
 {
 	b32 result = beamformer_push_pipeline_at(shaders, shader_count, data_kind, 0);
 	return result;
 }
 
 function b32
 beamformer_create_filter_base(BeamformerFilterKind kind, BeamformerFilterParameters params, u8 filter_slot, u8 parameter_block)
 {
 	b32 result = 0;
 	if (check_shared_memory()) {
 		BeamformWork *work = try_push_work_queue();
 		if (work) {
 			BeamformerCreateFilterContext *ctx = &work->create_filter_context;
 			work->kind = BeamformerWorkKind_CreateFilter;
 			ctx->kind            = kind;
 			ctx->parameters      = params;
 			ctx->filter_slot     = filter_slot     % BeamformerFilterSlots;
 			ctx->parameter_block = parameter_block % BeamformerMaxParameterBlockSlots;
 			beamform_work_queue_push_commit(&g_beamformer_library_context.bp->external_work_queue);
 			result = 1;
 		}
 	}
 	return result;
 }
 
 b32
 beamformer_create_filter(BeamformerFilterKind kind, f32 *filter_parameters, u32 filter_parameter_count,
                          f32 sampling_frequency, b32 complex, u8 filter_slot, u8 parameter_block)
 {
 	b32 result = 0;
 	if (lib_error_check(kind >= 0 && kind < BeamformerFilterKind_Count, BF_LIB_ERR_KIND_INVALID_FILTER_KIND)) {
 		BeamformerFilterParameters fp = {.sampling_frequency = sampling_frequency, .complex = complex != 0};
 		#define X(kind, ...) sizeof(fp.kind),
 		read_only local_persist u32 kind_sizes[] = {BEAMFORMER_FILTER_KIND_LIST(,)};
 		#undef X
 		if (lib_error_check(kind_sizes[kind] == sizeof(f32) * filter_parameter_count,
 		                    BF_LIB_ERR_KIND_INVALID_FILTER_PARAM_COUNT))
 		{
 			/* NOTE(rnp): any filter kind struct works as base offset of union */
 			mem_copy(&fp.Kaiser, filter_parameters, kind_sizes[kind]);
 			result = beamformer_create_filter_base(kind, fp, filter_slot, parameter_block);
 		}
 	}
 	return result;
 }
 
 function b32
 beamformer_flush_commands(i32 timeout_ms)
 {
 	b32 result = lib_try_lock(BeamformerSharedMemoryLockKind_DispatchCompute, timeout_ms);
 	return result;
 }
 
 function b32
 beamformer_compute_indirect(BeamformerViewPlaneTag tag, u32 block)
 {
 	b32 result = 0;
 	if (check_shared_memory() &&
 	    lib_error_check(tag   < BeamformerViewPlaneTag_Count, BF_LIB_ERR_KIND_INVALID_IMAGE_PLANE) &&
 	    lib_error_check(block < g_beamformer_library_context.bp->reserved_parameter_blocks,
 	                    BF_LIB_ERR_KIND_PARAMETER_BLOCK_UNALLOCATED))
 	{
 		BeamformWork *work = try_push_work_queue();
 		if (work) {
 			work->kind = BeamformerWorkKind_ComputeIndirect;
 			work->compute_indirect_context.view_plane      = tag;
 			work->compute_indirect_context.parameter_block = block;
 			beamform_work_queue_push_commit(&g_beamformer_library_context.bp->external_work_queue);
 			beamformer_flush_commands(0);
 			result = 1;
 		}
 	}
 	return result;
 }
 
 b32
 beamformer_start_compute(void)
 {
 	b32 result = beamformer_compute_indirect(0, 0);
 	return result;
 }
 
 b32
 beamformer_wait_for_compute_dispatch(i32 timeout_ms)
 {
 	b32 result = beamformer_flush_commands(timeout_ms);
 	/* NOTE(rnp): if you are calling this function you are probably about
 	 * to start some other work and it might be better to not do this... */
 	if (result) lib_release_lock(BeamformerSharedMemoryLockKind_DispatchCompute);
 	return result;
 }
 
 #define BEAMFORMER_UPLOAD_FNS \
 	X(channel_mapping, i16, 1, ChannelMapping) \
 	X(sparse_elements, i16, 1, SparseElements) \
 	X(focal_vectors,   f32, 2, FocalVectors)
 
 #define X(name, dtype, elements, region_name) \
 b32 beamformer_push_##name ##_at(dtype *data, u32 count, u32 block) { \
 	b32 result = 0; \
 	if (lib_error_check(count <= countof(((BeamformerParameterBlock *)0)->name), BF_LIB_ERR_KIND_BUFFER_OVERFLOW)) { \
 		result = parameter_block_region_upload(data, count * elements * sizeof(dtype), block, \
 		                                       BeamformerParameterBlockRegion_##region_name,  \
 		                                       g_beamformer_library_context.timeout_ms);      \
 	} \
 	return result; \
 }
 BEAMFORMER_UPLOAD_FNS
 #undef X
 
 #define X(name, dtype, ...) \
 b32 beamformer_push_##name (dtype *data, u32 count) { \
 	b32 result = beamformer_push_##name ##_at(data, count, 0); \
 	return result; \
 }
 BEAMFORMER_UPLOAD_FNS
 #undef X
 
 function b32
 beamformer_push_data_base(void *data, u32 data_size, i32 timeout_ms)
 {
 	b32 result = 0;
 	if (check_shared_memory()) {
 		Arena scratch = beamformer_shared_memory_scratch_arena(g_beamformer_library_context.bp);
 		if (lib_error_check(data_size <= arena_capacity(&scratch, u8), BF_LIB_ERR_KIND_BUFFER_OVERFLOW)) {
 			if (lib_try_lock(BeamformerSharedMemoryLockKind_UploadRF, timeout_ms)) {
 				if (lib_try_lock(BeamformerSharedMemoryLockKind_ScratchSpace, 0)) {
 					mem_copy(scratch.beg, data, data_size);
 					/* TODO(rnp): need a better way to communicate this */
 					g_beamformer_library_context.bp->scratch_rf_size = data_size;
 					lib_release_lock(BeamformerSharedMemoryLockKind_ScratchSpace);
 					result = 1;
 				}
 			}
 		}
 	}
 	return result;
 }
 
 b32
 beamformer_push_data(void *data, u32 data_size)
 {
 	return beamformer_push_data_base(data, data_size, g_beamformer_library_context.timeout_ms);
 }
 
 b32
 beamformer_push_data_with_compute(void *data, u32 data_size, u32 image_plane_tag, u32 parameter_slot)
 {
 	b32 result = beamformer_push_data_base(data, data_size, g_beamformer_library_context.timeout_ms);
 	if (result) result = beamformer_compute_indirect(image_plane_tag, parameter_slot);
 	return result;
 }
 
 b32
 beamformer_push_parameters_at(BeamformerParameters *bp, u32 block)
 {
 	b32 result = parameter_block_region_upload(bp, sizeof(*bp), block,
 	                                           BeamformerParameterBlockRegion_Parameters,
 	                                           g_beamformer_library_context.timeout_ms);
 	return result;
 }
 
 b32
 beamformer_push_parameters(BeamformerParameters *bp)
 {
 	b32 result = beamformer_push_parameters_at(bp, 0);
 	return result;
 }
 
 b32
 beamformer_push_parameters_ui(BeamformerUIParameters *bp)
 {
 	b32 result = parameter_block_region_upload_explicit(bp, sizeof(*bp), 0, BeamformerParameterBlockRegion_Parameters,
 	                                                    offsetof(BeamformerParameterBlock, parameters_ui),
 	                                                    g_beamformer_library_context.timeout_ms);
 	return result;
 }
 
 b32
 beamformer_push_parameters_head(BeamformerParametersHead *bp)
 {
 	b32 result = parameter_block_region_upload_explicit(bp, sizeof(*bp), 0, BeamformerParameterBlockRegion_Parameters,
 	                                                    offsetof(BeamformerParameterBlock, parameters_head),
 	                                                    g_beamformer_library_context.timeout_ms);
 	return result;
 }
 
 function b32
 beamformer_export_buffer(BeamformerExportContext export_context)
 {
 	BeamformWork *work = try_push_work_queue();
 	b32 result = work && lib_try_lock(BeamformerSharedMemoryLockKind_ExportSync, 0);
 	if (result) {
 		work->export_context = export_context;
 		work->kind = BeamformerWorkKind_ExportBuffer;
 		work->lock = BeamformerSharedMemoryLockKind_ScratchSpace;
 		beamform_work_queue_push_commit(&g_beamformer_library_context.bp->external_work_queue);
 	}
 	return result;
 }
 
 function b32
 beamformer_read_output(void *out, iz size, i32 timeout_ms)
 {
 	b32 result = 0;
 	if (lib_try_lock(BeamformerSharedMemoryLockKind_ExportSync, timeout_ms)) {
 		if (lib_try_lock(BeamformerSharedMemoryLockKind_ScratchSpace, 0)) {
 			Arena scratch = beamformer_shared_memory_scratch_arena(g_beamformer_library_context.bp);
 			mem_copy(out, scratch.beg, (uz)size);
 			lib_release_lock(BeamformerSharedMemoryLockKind_ScratchSpace);
 			result = 1;
 		}
 		lib_release_lock(BeamformerSharedMemoryLockKind_ExportSync);
 	}
 	return result;
 }
 
 b32
 beamform_data_synchronized(void *data, u32 data_size, i32 output_points[3], f32 *out_data, i32 timeout_ms)
 {
 	b32 result = 0;
 	if (check_shared_memory()) {
 		output_points[0] = MAX(1, output_points[0]);
 		output_points[1] = MAX(1, output_points[1]);
 		output_points[2] = MAX(1, output_points[2]);
 
 		BeamformerParameterBlock *b = beamformer_parameter_block(g_beamformer_library_context.bp, 0);
 		b->parameters.output_points[0] = output_points[0];
 		b->parameters.output_points[1] = output_points[1];
 		b->parameters.output_points[2] = output_points[2];
 
 		iz output_size = output_points[0] * output_points[1] * output_points[2] * (i32)sizeof(f32) * 2;
 
 		Arena scratch = beamformer_shared_memory_scratch_arena(g_beamformer_library_context.bp);
 		if (lib_error_check(output_size <= arena_capacity(&scratch, u8), BF_LIB_ERR_KIND_EXPORT_SPACE_OVERFLOW)
 		    && beamformer_push_data_with_compute(data, data_size, 0, 0))
 		{
 			BeamformerExportContext export;
 			export.kind = BeamformerExportKind_BeamformedData;
 			export.size = (u32)output_size;
 			if (beamformer_export_buffer(export)) {
 				/* NOTE(rnp): if this fails it just means that the work from push_data hasn't
 				 * started yet. This is here to catch the other case where the work started
 				 * and finished before we finished queuing the export work item */
 				beamformer_flush_commands(0);
 
 				result = beamformer_read_output(out_data, output_size, timeout_ms);
 			}
 		}
 	}
 	return result;
 }
 
 b32
 beamformer_compute_timings(BeamformerComputeStatsTable *output, i32 timeout_ms)
 {
 	static_assert(sizeof(*output) <= BEAMFORMER_SHARED_MEMORY_MAX_SCRATCH_SIZE,
 	              "timing table size exceeds scratch space");
 
 	b32 result = 0;
 	if (check_shared_memory()) {
 		Arena scratch = beamformer_shared_memory_scratch_arena(g_beamformer_library_context.bp);
 		if (lib_error_check(arena_capacity(&scratch, u8) <= (iz)sizeof(*output), BF_LIB_ERR_KIND_EXPORT_SPACE_OVERFLOW)) {
 			BeamformerExportContext export;
 			export.kind = BeamformerExportKind_Stats;
 			export.size = sizeof(*output);
 			if (beamformer_export_buffer(export) && beamformer_flush_commands(0))
 				result = beamformer_read_output(output, sizeof(*output), timeout_ms);
 		}
 	}
 	return result;
 }
 
 i32
 beamformer_live_parameters_get_dirty_flag(void)
 {
 	i32 result = -1;
 	if (check_shared_memory()) {
 		u32 flag = ctz_u32(g_beamformer_library_context.bp->live_imaging_dirty_flags);
 		if (flag != 32) {
 			atomic_and_u32(&g_beamformer_library_context.bp->live_imaging_dirty_flags, ~(1 << flag));
 			result = (i32)flag;
 		}
 	}
 	return result;
 }
 
 BeamformerLiveImagingParameters *
 beamformer_get_live_parameters(void)
 {
 	BeamformerLiveImagingParameters *result = 0;
 	if (check_shared_memory()) result = &g_beamformer_library_context.bp->live_imaging_parameters;
 	return result;
 }
 
 b32
 beamformer_set_live_parameters(BeamformerLiveImagingParameters *new)
 {
 	b32 result = 0;
 	if (check_shared_memory()) {
 		mem_copy(&g_beamformer_library_context.bp->live_imaging_parameters, new, sizeof(*new));
 		memory_write_barrier();
 		result = 1;
 	}
 	return result;
 }