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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. */
/** \file
* \ingroup draw
*/
#include "BKE_global.h"
#include "BLI_vector.hh"
#include "draw_texture_pool.h"
using namespace blender;
struct DRWTexturePoolHandle {
uint64_t users_bits;
GPUTexture *texture;
};
struct DRWTexturePool {
Vector<void *, 16> users;
Vector<DRWTexturePoolHandle> handles;
/* Cache last result to avoid linear search each time. */
int last_user_id = -1;
Vector<GPUTexture *> tmp_tex_pruned;
Vector<GPUTexture *> tmp_tex_released;
Vector<GPUTexture *> tmp_tex_acquired;
};
DRWTexturePool *DRW_texture_pool_create()
{
return new DRWTexturePool();
}
void DRW_texture_pool_free(DRWTexturePool *pool)
{
/* Resetting the pool twice will effectively free all textures. */
DRW_texture_pool_reset(pool);
DRW_texture_pool_reset(pool);
delete pool;
}
GPUTexture *DRW_texture_pool_query(
DRWTexturePool *pool, int width, int height, eGPUTextureFormat format, void *user)
{
int user_id = pool->last_user_id;
/* Try cached value. */
if (user_id != -1) {
if (pool->users[user_id] != user) {
user_id = -1;
}
}
/* Try to find inside previous users. */
if (user_id == -1) {
user_id = pool->users.first_index_of_try(user);
}
/* No chance, needs to add it to the user list. */
if (user_id == -1) {
user_id = pool->users.size();
pool->users.append(user);
/* If there is more than 63 users, better refactor this system. */
BLI_assert(user_id < 64);
}
pool->last_user_id = user_id;
uint64_t user_bit = 1llu << user_id;
for (DRWTexturePoolHandle &handle : pool->handles) {
/* Skip if the user is already using this texture. */
if (user_bit & handle.users_bits) {
continue;
}
/* If everything matches reuse the texture. */
if ((GPU_texture_format(handle.texture) == format) &&
(GPU_texture_width(handle.texture) == width) &&
(GPU_texture_height(handle.texture) == height)) {
handle.users_bits |= user_bit;
return handle.texture;
}
}
char name[16] = "DRW_tex_pool";
if (G.debug & G_DEBUG_GPU) {
int texture_id = pool->handles.size();
SNPRINTF(name, "DRW_tex_pool_%d", texture_id);
}
DRWTexturePoolHandle handle;
handle.users_bits = user_bit;
handle.texture = GPU_texture_create_2d(name, width, height, 1, format, nullptr);
pool->handles.append(handle);
/* Doing filtering for depth does not make sense when not doing shadow mapping,
* and enabling texture filtering on integer texture make them unreadable. */
bool do_filter = !GPU_texture_depth(handle.texture) && !GPU_texture_integer(handle.texture);
GPU_texture_filter_mode(handle.texture, do_filter);
return handle.texture;
}
GPUTexture *DRW_texture_pool_texture_acquire(DRWTexturePool *pool,
int width,
int height,
eGPUTextureFormat format)
{
GPUTexture *tmp_tex = nullptr;
int64_t found_index = 0;
auto texture_match = [&](GPUTexture *tex) -> bool {
/* TODO(@fclem): We could reuse texture using texture views if the formats are compatible. */
return (GPU_texture_format(tex) == format) && (GPU_texture_width(tex) == width) &&
(GPU_texture_height(tex) == height);
};
/* Search released texture first. */
for (auto i : pool->tmp_tex_released.index_range()) {
if (texture_match(pool->tmp_tex_released[i])) {
tmp_tex = pool->tmp_tex_released[i];
found_index = i;
break;
}
}
if (tmp_tex) {
pool->tmp_tex_released.remove_and_reorder(found_index);
}
else {
/* Then search pruned texture. */
for (auto i : pool->tmp_tex_pruned.index_range()) {
if (texture_match(pool->tmp_tex_pruned[i])) {
tmp_tex = pool->tmp_tex_pruned[i];
found_index = i;
break;
}
}
if (tmp_tex) {
pool->tmp_tex_pruned.remove_and_reorder(found_index);
}
}
if (!tmp_tex) {
/* Create a new texture in last resort. */
char name[16] = "DRW_tex_pool";
if (G.debug & G_DEBUG_GPU) {
int texture_id = pool->handles.size();
SNPRINTF(name, "DRW_tex_pool_%d", texture_id);
}
tmp_tex = GPU_texture_create_2d(name, width, height, 1, format, nullptr);
}
pool->tmp_tex_acquired.append(tmp_tex);
return tmp_tex;
}
void DRW_texture_pool_texture_release(DRWTexturePool *pool, GPUTexture *tmp_tex)
{
pool->tmp_tex_acquired.remove_first_occurrence_and_reorder(tmp_tex);
pool->tmp_tex_released.append(tmp_tex);
}
void DRW_texture_pool_reset(DRWTexturePool *pool)
{
pool->last_user_id = -1;
for (auto it = pool->handles.rbegin(); it != pool->handles.rend(); ++it) {
DRWTexturePoolHandle &handle = *it;
if (handle.users_bits == 0) {
if (handle.texture) {
GPU_texture_free(handle.texture);
handle.texture = nullptr;
}
}
else {
handle.users_bits = 0;
}
}
/* Reverse iteration to make sure we only reorder with known good handles. */
for (int i = pool->handles.size() - 1; i >= 0; i--) {
if (!pool->handles[i].texture) {
pool->handles.remove_and_reorder(i);
}
}
BLI_assert(pool->tmp_tex_acquired.is_empty());
for (GPUTexture *tmp_tex : pool->tmp_tex_pruned) {
GPU_texture_free(tmp_tex);
}
pool->tmp_tex_pruned = pool->tmp_tex_released;
pool->tmp_tex_released.clear();
}
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