Implement a new dedicated weight painting shader.

Move the weight paint drawing to the fragment shader. The shader
uses a texture that uses the U.coba_weight custom color band, or
an internal color band.

In addition to actual weights, the shader has to display two
alert colors: missing vertex group, and zero weight. The zero
weight alert has to be blended with regular weight colors,
so that a single alert vertex surrounded by weighted ones is
still visible.

Reviewers: campbellbarton, fclem

Differential Revision: https://developer.blender.org/D3675

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_common.h b/source/blender/draw/intern/draw_common.h
index 2640451a889..a7de7fdeafa 100644
--- a/source/blender/draw/intern/draw_common.h
+++ b/source/blender/draw/intern/draw_common.h
@@ -57,6 +57,8 @@ typedef struct GlobalsUboStorage {
 	float colorEmpty[4];
 	float colorVertex[4];
 	float colorVertexSelect[4];
+	float colorVertexUnreferenced[4];
+	float colorVertexMissingData[4];
 	float colorEditMeshActive[4];
 	float colorEdgeSelect[4];
 	float colorEdgeSeam[4];