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Differential D4455 Diff 14275 source/blender/draw/intern/draw_instance_data.c

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source/blender/draw/intern/draw_instance_data.c

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/** \file /** \file
* \ingroup draw * \ingroup draw
*/ */
/** /**
* DRW Instance Data Manager * DRW Instance Data Manager
* This is a special memory manager that keeps memory blocks ready to send as vbo data in one continuous allocation. * This is a special memory manager that keeps memory blocks ready to send as vbo data in one continuous allocation.
* This way we avoid feeding gawain each instance data one by one and unnecessary memcpy. * This way we avoid feeding gawain each instance data one by one and unnecessary memcpy.
* Since we loose which memory block was used each DRWShadingGroup we need to redistribute them in the same order/size * Since we loose which memory block was used each #DRWShadingGroup we need to redistribute them in the same order/size
* to avoid to realloc each frame. * to avoid to realloc each frame.
* This is why DRWInstanceDatas are sorted in a list for each different data size. * This is why #DRWInstanceDatas are sorted in a list for each different data size.
**/ */
#include "draw_instance_data.h" #include "draw_instance_data.h"
#include "DRW_engine.h" #include "DRW_engine.h"
#include "DRW_render.h" /* For DRW_shgroup_get_instance_count() */ #include "DRW_render.h" /* For DRW_shgroup_get_instance_count() */
#include "MEM_guardedalloc.h" #include "MEM_guardedalloc.h"
#include "BLI_utildefines.h" #include "BLI_utildefines.h"
#include "BLI_mempool.h" #include "BLI_mempool.h"
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/** /**
* This manager allows to distribute existing batches for instancing * This manager allows to distribute existing batches for instancing
* attributes. This reduce the number of batches creation. * attributes. This reduce the number of batches creation.
* Querying a batch is done with a vertex format. This format should * Querying a batch is done with a vertex format. This format should
* be static so that it's pointer never changes (because we are using * be static so that it's pointer never changes (because we are using
* this pointer as identifier [we don't want to check the full format * this pointer as identifier [we don't want to check the full format
* that would be too slow]). * that would be too slow]).
**/ */
static void instance_batch_free(GPUBatch *batch, void *UNUSED(user_data)) static void instance_batch_free(GPUBatch *batch, void *UNUSED(user_data))
{ {
if (batch->verts[0] == NULL) { if (batch->verts[0] == NULL) {
/** XXX This is a false positive case. /** XXX This is a false positive case.
* The batch has been requested but not init yet * The batch has been requested but not init yet
* and there is a chance that it might become init. * and there is a chance that it might become init.
**/ */
return; return;
} }
/* Free all batches that have the same key before they are reused. */ /* Free all batches that have the same key before they are reused. */
/* TODO: Make it thread safe! Batch freeing can happen from another thread. */ /* TODO: Make it thread safe! Batch freeing can happen from another thread. */
/* XXX we need to iterate over all idatalists unless we make some smart /* XXX we need to iterate over all idatalists unless we make some smart
* data structure to store the locations to update. */ * data structure to store the locations to update. */
for (DRWInstanceDataList *idatalist = g_idatalists.first; idatalist; idatalist = idatalist->next) { for (DRWInstanceDataList *idatalist = g_idatalists.first; idatalist; idatalist = idatalist->next) {
DRWInstancingBuffer *ibuf = idatalist->instancing.ibufs; DRWInstancingBuffer *ibuf = idatalist->instancing.ibufs;
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static void DRW_instance_data_free(DRWInstanceData *idata) static void DRW_instance_data_free(DRWInstanceData *idata)
{ {
BLI_mempool_destroy(idata->mempool); BLI_mempool_destroy(idata->mempool);
} }
/** /**
* Return a pointer to the next instance data space. * Return a pointer to the next instance data space.
**/ */
void *DRW_instance_data_next(DRWInstanceData *idata) void *DRW_instance_data_next(DRWInstanceData *idata)
{ {
return BLI_mempool_alloc(idata->mempool); return BLI_mempool_alloc(idata->mempool);
} }
DRWInstanceData *DRW_instance_data_request(DRWInstanceDataList *idatalist, uint attr_size) DRWInstanceData *DRW_instance_data_request(DRWInstanceDataList *idatalist, uint attr_size)
{ {
BLI_assert(attr_size > 0 && attr_size <= MAX_INSTANCE_DATA_SIZE); BLI_assert(attr_size > 0 && attr_size <= MAX_INSTANCE_DATA_SIZE);
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