Cleanup: GPU: Move towards an explicit Blend state

This make use of the GLStateStack functions for:
- `GPU_blend()`
- `GPU_blend_set_func()`
- `GPU_blend_set_func_separate()`

The goal is to unify them using an explicit state setting.
This will remove the need to use obscure blend functions

1 files changed, 2 insertions, 6 deletions

diff --git a/source/blender/editors/sculpt_paint/paint_cursor.c b/source/blender/editors/sculpt_paint/paint_cursor.c
index 63b4516b1cc..0c5e4ea9538 100644
--- a/source/blender/editors/sculpt_paint/paint_cursor.c
+++ b/source/blender/editors/sculpt_paint/paint_cursor.c
@@ -634,8 +634,8 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
     uint texCoord = GPU_vertformat_attr_add(format, "texCoord", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
     /* Premultiplied alpha blending. */
-    GPU_blend_set_func(GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
     GPU_blend(true);
+    GPU_blend_set_func(GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
 
     immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
 
@@ -670,8 +670,6 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
 
     GPU_texture_unbind(texture);
 
-    GPU_blend_set_func(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA);
-
     if (ELEM(mtex->brush_map_mode, MTEX_MAP_MODE_STENCIL, MTEX_MAP_MODE_VIEW)) {
       GPU_matrix_pop();
     }
@@ -729,8 +727,8 @@ static bool paint_draw_cursor_overlay(
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
     uint texCoord = GPU_vertformat_attr_add(format, "texCoord", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    GPU_blend_set_func(GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
     GPU_blend(true);
+    GPU_blend_set_func(GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
 
     immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
 
@@ -757,8 +755,6 @@ static bool paint_draw_cursor_overlay(
 
     immUnbindProgram();
 
-    GPU_blend_set_func(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA);
-
     if (do_pop) {
       GPU_matrix_pop();
     }