Workbench: Support Active Vertex Color

Currently it is not possible to view the vertex colors of an object. To
optimize the workflow, workbench will need to support Vertex Colors.

The Vertex Colors is a new option in `shading->color_type`. When objects
do not have vertex color, the objects will be rendered with the
`V3D_SHADING_OBJECT_COLOR`.

In order to support vertex colors in workbench the current texture/solid
shading structure is migrated to a primary shaders and fallback shaders.

Fix: T57000

Reviewers: brecht, fclem

Differential Revision: https://developer.blender.org/D4694

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_buffers.h b/source/blender/gpu/GPU_buffers.h
index 895887c2588..20047174bb1 100644
--- a/source/blender/gpu/GPU_buffers.h
+++ b/source/blender/gpu/GPU_buffers.h
@@ -35,6 +35,7 @@ struct MLoop;
 struct MLoopTri;
 struct MPoly;
 struct MVert;
+struct MLoopCol;
 struct PBVH;
 
 /* Buffers for drawing from PBVH grids. */
@@ -57,6 +58,7 @@ GPU_PBVH_Buffers *GPU_pbvh_bmesh_buffers_build(bool smooth_shading);
 
 enum {
   GPU_PBVH_BUFFERS_SHOW_MASK = (1 << 1),
+  GPU_PBVH_BUFFERS_SHOW_VCOL = (1 << 1),
 };
 
 void GPU_pbvh_mesh_buffers_update(GPU_PBVH_Buffers *buffers,
@@ -64,6 +66,7 @@ void GPU_pbvh_mesh_buffers_update(GPU_PBVH_Buffers *buffers,
                                   const int *vert_indices,
                                   int totvert,
                                   const float *vmask,
+                                  const struct MLoopCol *vcol,
                                   const int (*face_vert_indices)[3],
                                   const int update_flags);