GPU: Simplify select shaders.

The shaders are: `GPU_SHADER_3D_FLAT_SELECT_ID` and `GPU_SHADER_3D_UNIFORM_SELECT_ID`.
This commit allows the drawing of the mesh select ids to be done on a 32UI format texture.
This simplifies the shader that previously acted on the backbuffer and had to do an uint to rgba conversion.

Differential Revision: https://developer.blender.org/D4350

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/draw/DRW_engine.h b/source/blender/draw/DRW_engine.h
index e261de3c900..68d4ef04f95 100644
--- a/source/blender/draw/DRW_engine.h
+++ b/source/blender/draw/DRW_engine.h
@@ -123,6 +123,10 @@ void DRW_draw_depth_loop(
         struct Depsgraph *depsgraph,
         struct ARegion *ar, struct View3D *v3d);
 
+void DRW_framebuffer_select_id_setup(struct ARegion *ar, const bool clear);
+void DRW_framebuffer_select_id_release(struct ARegion *ar);
+void DRW_framebuffer_select_id_read(const struct rcti *rect, uint *r_buf);
+
 /* grease pencil render */
 bool DRW_render_check_grease_pencil(struct Depsgraph *depsgraph);
 void DRW_render_gpencil(struct RenderEngine *engine, struct Depsgraph *depsgraph);