Sculpt: Add extra deform types to Slide

This adds extra deform modes to the slide mode of the Topology
Slide/Relax brush (both slide and smear are almost identical).
This is useful to move topology to a specific area to add more localized
details

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D8349

4 files changed, 38 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c
index a85617680d2..355bdfd10fd 100644
--- a/source/blender/blenkernel/intern/brush.c
+++ b/source/blender/blenkernel/intern/brush.c
@@ -1484,6 +1484,7 @@ void BKE_brush_sculpt_reset(Brush *br)
     case SCULPT_TOOL_SLIDE_RELAX:
       br->spacing = 10;
       br->alpha = 1.0f;
+      br->slide_deform_type = BRUSH_SLIDE_DEFORM_DRAG;
       break;
     case SCULPT_TOOL_CLAY:
       br->flag |= BRUSH_SIZE_PRESSURE;
diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index e679c62fdaa..da5d6588dc8 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -3100,11 +3100,23 @@ static void do_topology_slide_task_cb_ex(void *__restrict userdata,
                                                       thread_id);
       float current_disp[3];
       float current_disp_norm[3];
-      float final_disp[3];
-      zero_v3(final_disp);
-      sub_v3_v3v3(current_disp, ss->cache->location, ss->cache->last_location);
+      float final_disp[3] = {0.0f, 0.0f, 0.0f};
+
+      switch (brush->slide_deform_type) {
+        case BRUSH_SLIDE_DEFORM_DRAG:
+          sub_v3_v3v3(current_disp, ss->cache->location, ss->cache->last_location);
+          break;
+        case BRUSH_SLIDE_DEFORM_PINCH:
+          sub_v3_v3v3(current_disp, ss->cache->location, vd.co);
+          break;
+        case BRUSH_SLIDE_DEFORM_EXPAND:
+          sub_v3_v3v3(current_disp, vd.co, ss->cache->location);
+          break;
+      }
+
       normalize_v3_v3(current_disp_norm, current_disp);
       mul_v3_v3fl(current_disp, current_disp_norm, ss->cache->bstrength);
+
       SculptVertexNeighborIter ni;
       SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
         float vertex_disp[3];
diff --git a/source/blender/makesdna/DNA_brush_types.h b/source/blender/makesdna/DNA_brush_types.h
index 76a172d6fda..e2102abb285 100644
--- a/source/blender/makesdna/DNA_brush_types.h
+++ b/source/blender/makesdna/DNA_brush_types.h
@@ -349,6 +349,12 @@ typedef enum eBrushSmearDeformType {
   BRUSH_SMEAR_DEFORM_EXPAND = 2,
 } eBrushSmearDeformType;
 
+typedef enum eBrushSlideDeformType {
+  BRUSH_SLIDE_DEFORM_DRAG = 0,
+  BRUSH_SLIDE_DEFORM_PINCH = 1,
+  BRUSH_SLIDE_DEFORM_EXPAND = 2,
+} eBrushSlideDeformType;
+
 /* Gpencilsettings.Vertex_mode */
 typedef enum eGp_Vertex_Mode {
   /* Affect to Stroke only. */
@@ -494,7 +500,7 @@ typedef struct Brush {
   /** Source for fill tool color gradient application. */
   char gradient_fill_mode;
 
-  char _pad0[5];
+  char _pad0[1];
 
   /** Projection shape (sphere, circle). */
   char falloff_shape;
@@ -578,6 +584,9 @@ typedef struct Brush {
   /* smear */
   int smear_deform_type;
 
+  /* slide/relax */
+  int slide_deform_type;
+
   /* overlay */
   int texture_overlay_alpha;
   int mask_overlay_alpha;
diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index 43f31922292..71922eb86b5 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -2004,6 +2004,13 @@ static void rna_def_brush(BlenderRNA *brna)
       {0, NULL, 0, NULL, NULL},
   };
 
+  static const EnumPropertyItem brush_slide_deform_type_items[] = {
+      {BRUSH_SLIDE_DEFORM_DRAG, "DRAG", 0, "Drag", ""},
+      {BRUSH_SLIDE_DEFORM_PINCH, "PINCH", 0, "Pinch", ""},
+      {BRUSH_SLIDE_DEFORM_EXPAND, "EXPAND", 0, "Expand", ""},
+      {0, NULL, 0, NULL, NULL},
+  };
+
   srna = RNA_def_struct(brna, "Brush", "ID");
   RNA_def_struct_ui_text(
       srna, "Brush", "Brush data-block for storing brush settings for painting and sculpting");
@@ -2129,6 +2136,11 @@ static void rna_def_brush(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Deformation", "Deformation type that is used in the brush");
   RNA_def_property_update(prop, 0, "rna_Brush_update");
 
+  prop = RNA_def_property(srna, "slide_deform_type", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, brush_slide_deform_type_items);
+  RNA_def_property_ui_text(prop, "Deformation", "Deformation type that is used in the brush");
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
   prop = RNA_def_property(srna, "pose_deform_type", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_items(prop, brush_pose_deform_type_items);
   RNA_def_property_ui_text(prop, "Deformation", "Deformation type that is used in the brush");