GPU: refactor clipped drawing from DRW into GPU

Needed to fix T61196, supporting clipped back-buffer in the 3D view
which is done outside the draw module.

It was also inconvenient having DRW_shader_* versions of GPU_shader_*
API calls.

- Clipping distances are now supported as a shader configuration
  for builtin shaders.
- Add shader config argument when accessing builtin shaders.
- Move GPU_shader_create_from_arrays() from DRW to GPU.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/draw/engines/external/external_engine.c b/source/blender/draw/engines/external/external_engine.c
index d7e290917aa..d4930889449 100644
--- a/source/blender/draw/engines/external/external_engine.c
+++ b/source/blender/draw/engines/external/external_engine.c
@@ -91,7 +91,7 @@ static void external_engine_init(void *UNUSED(vedata))
 {
 	/* Depth prepass */
 	if (!e_data.depth_sh) {
-		e_data.depth_sh = DRW_shader_create_3D_depth_only(DRW_SHADER_SLOT_DEFAULT);
+		e_data.depth_sh = DRW_shader_create_3D_depth_only(GPU_SHADER_CFG_DEFAULT);
 	}
 }