GPU: remove 'GPU_SHADER_2D_SMOOTH_COLOR'

The only real difference between `GPU_SHADER_2D_SMOOTH_COLOR` and
`GPU_SHADER_3D_SMOOTH_COLOR` is that in the vertex shader the 2D
version uses `vec4(pos, 0.0, 1.0)` and the 3D version uses
`vec4(pos, 1.0)`.

But VBOs with 2D attributes work perfectly in shaders that use 3D
attributes. Components not specified are filled with components from
`vec4(0.0, 0.0, 0.0, 1.0)`.

So there is no real benefit to having two different shader versions.

This will simplify porting shaders to python as it will not be
necessary to use a 3D and a 2D version of the shaders.

In python the new name for '2D_SMOOTH_COLOR' and '3D_SMOOTH_COLOR'
is 'SMOOTH_COLOR', but the old names still work for backward
compatibility.

10 files changed, 7 insertions, 52 deletions

diff --git a/source/blender/editors/interface/interface_draw.c b/source/blender/editors/interface/interface_draw.c
index 4dae8222b14..02325920e6d 100644
--- a/source/blender/editors/interface/interface_draw.c
+++ b/source/blender/editors/interface/interface_draw.c
@@ -205,7 +205,7 @@ void ui_draw_but_TAB_outline(const rcti *rect,
     mul_v2_fl(vec[a], rad);
   }
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
   immBeginAtMost(GPU_PRIM_LINE_STRIP, 25);
 
   immAttr3ubv(col, highlight);
@@ -1242,7 +1242,7 @@ void ui_draw_but_COLORBAND(uiBut *but, const uiWidgetColors *UNUSED(wcol), const
   format = immVertexFormat();
   pos_id = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   col_id = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   /* layer: color ramp */
   GPU_blend(GPU_BLEND_ALPHA);
@@ -2288,7 +2288,7 @@ void UI_draw_box_shadow(const rctf *rect, uchar alpha)
   uint color = GPU_vertformat_attr_add(
       format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRIS, 54);
 
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index f49863cf306..53b1967d668 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -2930,7 +2930,7 @@ static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint color = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRI_FAN, tot + 2);
   immAttr3fv(color, rgb_center);
@@ -3061,7 +3061,7 @@ void ui_draw_gradient(const rcti *rect,
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRIS, steps * 3 * 6);
 
@@ -5155,7 +5155,7 @@ static void draw_disk_shaded(float start,
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   if (shaded) {
     col = GPU_vertformat_attr_add(format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
-    immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
   }
   else {
     immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt
index d1b0e227506..2eceeedf845 100644
--- a/source/blender/gpu/CMakeLists.txt
+++ b/source/blender/gpu/CMakeLists.txt
@@ -274,8 +274,6 @@ set(GLSL_SRC
   shaders/gpu_shader_2D_nodelink_vert.glsl
   shaders/gpu_shader_2D_line_dashed_uniform_color_vert.glsl
   shaders/gpu_shader_2D_line_dashed_frag.glsl
-  shaders/gpu_shader_2D_smooth_color_vert.glsl
-  shaders/gpu_shader_2D_smooth_color_frag.glsl
   shaders/gpu_shader_2D_image_vert.glsl
   shaders/gpu_shader_2D_image_rect_vert.glsl
   shaders/gpu_shader_2D_image_multi_rect_vert.glsl
@@ -588,7 +586,6 @@ set(SRC_SHADER_CREATE_INFOS
   shaders/infos/gpu_shader_2D_point_uniform_size_uniform_color_aa_info.hh
   shaders/infos/gpu_shader_2D_point_uniform_size_uniform_color_outline_aa_info.hh
   shaders/infos/gpu_shader_2D_point_varying_size_varying_color_info.hh
-  shaders/infos/gpu_shader_2D_smooth_color_info.hh
   shaders/infos/gpu_shader_2D_widget_info.hh
   shaders/infos/gpu_shader_3D_depth_only_info.hh
   shaders/infos/gpu_shader_3D_flat_color_info.hh
diff --git a/source/blender/gpu/GPU_shader.h b/source/blender/gpu/GPU_shader.h
index 0f3a494fc3f..d694fcf4da1 100644
--- a/source/blender/gpu/GPU_shader.h
+++ b/source/blender/gpu/GPU_shader.h
@@ -212,7 +212,6 @@ typedef enum eGPUBuiltinShader {
    * \param color: in vec4
    * \param pos: in vec2
    */
-  GPU_SHADER_2D_SMOOTH_COLOR,
   GPU_SHADER_2D_IMAGE_COLOR,
   GPU_SHADER_2D_IMAGE_DESATURATE_COLOR,
   GPU_SHADER_2D_IMAGE_RECT_COLOR,
diff --git a/source/blender/gpu/intern/gpu_immediate.cc b/source/blender/gpu/intern/gpu_immediate.cc
index 8574e886cd0..3b4accf9cc5 100644
--- a/source/blender/gpu/intern/gpu_immediate.cc
+++ b/source/blender/gpu/intern/gpu_immediate.cc
@@ -137,7 +137,6 @@ static void wide_line_workaround_start(GPUPrimType prim_type)
     case GPU_SHADER_3D_FLAT_COLOR:
       polyline_sh = GPU_SHADER_3D_POLYLINE_FLAT_COLOR;
       break;
-    case GPU_SHADER_2D_SMOOTH_COLOR:
     case GPU_SHADER_3D_SMOOTH_COLOR:
       polyline_sh = GPU_SHADER_3D_POLYLINE_SMOOTH_COLOR;
       break;
diff --git a/source/blender/gpu/intern/gpu_shader_builtin.c b/source/blender/gpu/intern/gpu_shader_builtin.c
index 8afe3e04dc9..d255084609e 100644
--- a/source/blender/gpu/intern/gpu_shader_builtin.c
+++ b/source/blender/gpu/intern/gpu_shader_builtin.c
@@ -26,8 +26,6 @@ extern char datatoc_gpu_shader_2D_area_borders_vert_glsl[];
 extern char datatoc_gpu_shader_2D_area_borders_frag_glsl[];
 extern char datatoc_gpu_shader_2D_vert_glsl[];
 extern char datatoc_gpu_shader_2D_smooth_color_uniform_alpha_vert_glsl[];
-extern char datatoc_gpu_shader_2D_smooth_color_vert_glsl[];
-extern char datatoc_gpu_shader_2D_smooth_color_frag_glsl[];
 extern char datatoc_gpu_shader_2D_image_vert_glsl[];
 extern char datatoc_gpu_shader_2D_image_rect_vert_glsl[];
 extern char datatoc_gpu_shader_2D_image_multi_rect_vert_glsl[];
@@ -155,11 +153,6 @@ static const GPUShaderStages builtin_shader_stages[GPU_SHADER_BUILTIN_LEN] = {
             .create_info = "gpu_shader_2D_diag_stripes",
         },
 
-    [GPU_SHADER_2D_SMOOTH_COLOR] =
-        {
-            .name = "GPU_SHADER_2D_SMOOTH_COLOR",
-            .create_info = "gpu_shader_2D_smooth_color",
-        },
     [GPU_SHADER_2D_IMAGE_OVERLAYS_MERGE] =
         {
             .name = "GPU_SHADER_2D_IMAGE_OVERLAYS_MERGE",
diff --git a/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_frag.glsl b/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_frag.glsl
deleted file mode 100644
index 8690ba0767a..00000000000
--- a/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_frag.glsl
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma BLENDER_REQUIRE(gpu_shader_colorspace_lib.glsl)
-
-void main()
-{
-  fragColor = finalColor;
-  fragColor = blender_srgb_to_framebuffer_space(fragColor);
-}
diff --git a/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl b/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl
deleted file mode 100644
index cf948bb2533..00000000000
--- a/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl
+++ /dev/null
@@ -1,6 +0,0 @@
-
-void main()
-{
-  gl_Position = ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);
-  finalColor = color;
-}
diff --git a/source/blender/gpu/shaders/infos/gpu_shader_2D_smooth_color_info.hh b/source/blender/gpu/shaders/infos/gpu_shader_2D_smooth_color_info.hh
deleted file mode 100644
index d6edeef0dfb..00000000000
--- a/source/blender/gpu/shaders/infos/gpu_shader_2D_smooth_color_info.hh
+++ /dev/null
@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright 2022 Blender Foundation. All rights reserved. */
-
-/** \file
- * \ingroup gpu
- */
-
-#include "gpu_interface_info.hh"
-#include "gpu_shader_create_info.hh"
-
-GPU_SHADER_CREATE_INFO(gpu_shader_2D_smooth_color)
-    .vertex_in(0, Type::VEC2, "pos")
-    .vertex_in(1, Type::VEC4, "color")
-    .vertex_out(smooth_color_iface)
-    .fragment_out(0, Type::VEC4, "fragColor")
-    .push_constant(Type::MAT4, "ModelViewProjectionMatrix")
-    .vertex_source("gpu_shader_2D_smooth_color_vert.glsl")
-    .fragment_source("gpu_shader_2D_smooth_color_frag.glsl")
-    .additional_info("gpu_srgb_to_framebuffer_space")
-    .do_static_compilation(true);
diff --git a/source/blender/windowmanager/intern/wm_gesture.c b/source/blender/windowmanager/intern/wm_gesture.c
index c4710260e54..7eec522690c 100644
--- a/source/blender/windowmanager/intern/wm_gesture.c
+++ b/source/blender/windowmanager/intern/wm_gesture.c
@@ -122,7 +122,7 @@ static void wm_gesture_draw_line_active_side(rcti *rect, const bool flip)
   uint shdr_col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
 
   GPU_blend(GPU_BLEND_ALPHA);
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   const float gradient_length = 150.0f * U.pixelsize;
   float line_dir[2];