Sculpt Vertex Colors: Initial implementation

Sculpt Vertex Colors is a painting system that runs inside sculpt mode, reusing all its tools and optimizations. This provides much better performance, easier to maintain code and more advanced features (new brush engine, filters, symmetry options, masks and face sets compatibility...). This is also the initial step for future features like vertex painting in Multires and brushes that can sculpt and paint at the same time.

This commit includes:
  - SCULPT_UNDO_COLOR for undo support in sculpt mode
  - SCULPT_UPDATE_COLOR and PBVH flags and rendering
  - Sculpt Color API functions
  - Sculpt capability for sculpt tools (only enabled in the Paint Brush for now)
  - Rendering support in workbench (default to Sculpt Vertex Colors except in Vertex Paint)
  - Conversion operator between MPropCol (Sculpt Vertex Colors) and MLoopCol (Vertex Paint)
  - Remesher reprojection in the Voxel Remehser
  - Paint Brush and Smear Brush with color smoothing in alt-smooth mode
  - Parameters for the new brush engine (density, opacity, flow, wet paint mixing, tip scale) implemented in Sculpt Vertex Colors
  - Color Filter
  - Color picker (uses S shortcut, replaces smooth)
  - Color selector in the top bar

Reviewed By: brecht

Maniphest Tasks: T72866

Differential Revision: https://developer.blender.org/D5975

1 files changed, 14 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_pbvh.h b/source/blender/blenkernel/BKE_pbvh.h
index 8fb6f140822..87875314aec 100644
--- a/source/blender/blenkernel/BKE_pbvh.h
+++ b/source/blender/blenkernel/BKE_pbvh.h
@@ -58,6 +58,10 @@ typedef struct {
   float (*co)[3];
 } PBVHProxyNode;
 
+typedef struct {
+  float (*color)[4];
+} PBVHColorBufferNode;
+
 typedef enum {
   PBVH_Leaf = 1 << 0,
 
@@ -75,6 +79,7 @@ typedef enum {
   PBVH_FullyUnmasked = 1 << 12,
 
   PBVH_UpdateTopology = 1 << 13,
+  PBVH_UpdateColor = 1 << 14,
 } PBVHNodeFlags;
 
 typedef struct PBVHFrustumPlanes {
@@ -252,6 +257,7 @@ bool BKE_pbvh_bmesh_update_topology(PBVH *pbvh,
 
 void BKE_pbvh_node_mark_update(PBVHNode *node);
 void BKE_pbvh_node_mark_update_mask(PBVHNode *node);
+void BKE_pbvh_node_mark_update_color(PBVHNode *node);
 void BKE_pbvh_node_mark_update_visibility(PBVHNode *node);
 void BKE_pbvh_node_mark_rebuild_draw(PBVHNode *node);
 void BKE_pbvh_node_mark_redraw(PBVHNode *node);
@@ -352,6 +358,7 @@ typedef struct PBVHVertexIter {
   struct MVert *mverts;
   int totvert;
   const int *vert_indices;
+  struct MPropCol *vcol;
   float *vmask;
 
   /* bmesh */
@@ -368,6 +375,7 @@ typedef struct PBVHVertexIter {
   short *no;
   float *fno;
   float *mask;
+  float *col;
   bool visible;
 } PBVHVertexIter;
 
@@ -419,7 +427,9 @@ void pbvh_vertex_iter_init(PBVH *pbvh, PBVHNode *node, PBVHVertexIter *vi, int m
           vi.no = vi.mvert->no; \
           vi.index = vi.vert_indices[vi.i]; \
           if (vi.vmask) \
-            vi.mask = &vi.vmask[vi.vert_indices[vi.gx]]; \
+            vi.mask = &vi.vmask[vi.index]; \
+          if (vi.vcol) \
+            vi.col = vi.vcol[vi.index].color; \
         } \
         else { \
           if (!BLI_gsetIterator_done(&vi.bm_unique_verts)) { \
@@ -472,6 +482,9 @@ void BKE_pbvh_parallel_range_settings(struct TaskParallelSettings *settings,
 
 struct MVert *BKE_pbvh_get_verts(const PBVH *pbvh);
 
+PBVHColorBufferNode *BKE_pbvh_node_color_buffer_get(PBVHNode *node);
+void BKE_pbvh_node_color_buffer_free(PBVH *pbvh);
+
 #ifdef __cplusplus
 }
 #endif