DRW: GPU Wrapper: add possibility to swap Texture and TextureFromPool

Ownership is transfered from the pool to the `Texture` and vice versa.
This allows to have history buffers with only 1 persistent texture.

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_texture_pool.cc b/source/blender/draw/intern/draw_texture_pool.cc
index b36cb5c809e..017ecec7be2 100644
--- a/source/blender/draw/intern/draw_texture_pool.cc
+++ b/source/blender/draw/intern/draw_texture_pool.cc
@@ -160,6 +160,19 @@ void DRW_texture_pool_texture_release(DRWTexturePool *pool, GPUTexture *tmp_tex)
   pool->tmp_tex_released.append(tmp_tex);
 }
 
+void DRW_texture_pool_take_texture_ownership(DRWTexturePool *pool, GPUTexture *tex)
+{
+  pool->tmp_tex_acquired.remove_first_occurrence_and_reorder(tex);
+}
+
+void DRW_texture_pool_give_texture_ownership(DRWTexturePool *pool, GPUTexture *tex)
+{
+  BLI_assert(pool->tmp_tex_acquired.first_index_of_try(tex) == -1 &&
+             pool->tmp_tex_released.first_index_of_try(tex) == -1 &&
+             pool->tmp_tex_pruned.first_index_of_try(tex) == -1);
+  pool->tmp_tex_acquired.append(tex);
+}
+
 void DRW_texture_pool_reset(DRWTexturePool *pool)
 {
   pool->last_user_id = -1;