Sculpt: Support pen pressure modulation in Paint Brush properties

This allows to use pen pressure modulation in hardness, wet mix, wet
persistence, flow and density, as well as inverting the modulation (more
pressure, less density...). With this, it is possible to create brushes
that mix paint or apply a new color based on the pressure.

Reviewed By: sergey, campbellbarton

Differential Revision: https://developer.blender.org/D8267

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index 17c7e9e86c0..f834ab7b179 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -827,6 +827,15 @@ typedef struct StrokeCache {
   bool original;
   float anchored_location[3];
 
+  /* Paint Brush. */
+  struct {
+    float hardness;
+    float flow;
+    float wet_mix;
+    float wet_persistence;
+    float density;
+  } paint_brush;
+
   /* Pose brush */
   struct SculptPoseIKChain *pose_ik_chain;