GPU: remove 'GPU_SHADER_2D_FLAT_COLOR'

The only real difference between `GPU_SHADER_2D_FLAT_COLOR` and
`GPU_SHADER_3D_FLAT_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_FLAT_COLOR'' and '3D_FLAT_COLOR'
is 'FLAT_COLOR', but the old names still work for backward
compatibility.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/space_graph/graph_draw.c b/source/blender/editors/space_graph/graph_draw.c
index 6ee1e6f021a..659cba0587a 100644
--- a/source/blender/editors/space_graph/graph_draw.c
+++ b/source/blender/editors/space_graph/graph_draw.c
@@ -408,7 +408,7 @@ static void draw_fcurve_handles(SpaceGraph *sipo, FCurve *fcu)
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   uint color = GPU_vertformat_attr_add(
       format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
   if ((sipo->flag & SIPO_BEAUTYDRAW_OFF) == 0) {
     GPU_line_smooth(true);
   }