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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* 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;
};
DRWTexturePool *DRW_texture_pool_create(void)
{
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;
}
/**
* Try to find a texture corresponding to params into the texture pool.
* If no texture was found, create one and add it to the 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;
}
/* Resets the user bits for each texture in the pool and delete unused ones. */
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);
}
}
}
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