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, 78 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index b4703ab9aa2..43f31922292 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -2283,6 +2283,84 @@ static void rna_def_brush(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Tip Scale X", "Scale of the brush tip in the X axis");
   RNA_def_property_update(prop, 0, "rna_Brush_update");
 
+  prop = RNA_def_property(srna, "use_hardness_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_HARDNESS_PRESSURE);
+  RNA_def_property_ui_icon(prop, ICON_STYLUS_PRESSURE, 0);
+  RNA_def_property_ui_text(prop, "Use Pressure for Hardness", "Use pressure to modulate hardness");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "invert_hardness_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_HARDNESS_PRESSURE_INVERT);
+  RNA_def_property_ui_icon(prop, ICON_ARROW_LEFTRIGHT, 0);
+  RNA_def_property_ui_text(
+      prop, "Invert Pressure for Hardness", "Invert the modulation of pressure in hardness");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "use_flow_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_FLOW_PRESSURE);
+  RNA_def_property_ui_icon(prop, ICON_STYLUS_PRESSURE, 0);
+  RNA_def_property_ui_text(prop, "Use Pressure for Flow", "Use pressure to modulate flow");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "invert_flow_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_FLOW_PRESSURE_INVERT);
+  RNA_def_property_ui_icon(prop, ICON_ARROW_LEFTRIGHT, 0);
+  RNA_def_property_ui_text(
+      prop, "Invert Pressure for Flow", "Invert the modulation of pressure in flow");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "use_wet_mix_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_WET_MIX_PRESSURE);
+  RNA_def_property_ui_icon(prop, ICON_STYLUS_PRESSURE, 0);
+  RNA_def_property_ui_text(prop, "Use Pressure for Wet Mix", "Use pressure to modulate wet mix");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "invert_wet_mix_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_WET_MIX_PRESSURE_INVERT);
+  RNA_def_property_ui_icon(prop, ICON_ARROW_LEFTRIGHT, 0);
+  RNA_def_property_ui_text(
+      prop, "Invert Pressure for Wet Mix", "Invert the modulation of pressure in wet mix");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "use_wet_persistence_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_WET_PERSISTENCE_PRESSURE);
+  RNA_def_property_ui_icon(prop, ICON_STYLUS_PRESSURE, 0);
+  RNA_def_property_ui_text(
+      prop, "Use Pressure for Wet Persistence", "Use pressure to modulate wet persistence");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "invert_wet_persistence_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(
+      prop, NULL, "paint_flags", BRUSH_PAINT_WET_PERSISTENCE_PRESSURE_INVERT);
+  RNA_def_property_ui_icon(prop, ICON_ARROW_LEFTRIGHT, 0);
+  RNA_def_property_ui_text(prop,
+                           "Invert Pressure for Wet Persistence",
+                           "Invert the modulation of pressure in wet persistence");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "use_density_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_DENSITY_PRESSURE);
+  RNA_def_property_ui_icon(prop, ICON_STYLUS_PRESSURE, 0);
+  RNA_def_property_ui_text(prop, "Use Pressure for Density", "Use pressure to modulate density");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
+  prop = RNA_def_property(srna, "invert_density_pressure", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "paint_flags", BRUSH_PAINT_DENSITY_PRESSURE_INVERT);
+  RNA_def_property_ui_icon(prop, ICON_ARROW_LEFTRIGHT, 0);
+  RNA_def_property_ui_text(
+      prop, "Invert Pressure for Density", "Invert the modulation of pressure in density");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
   prop = RNA_def_property(srna, "dash_ratio", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "dash_ratio");
   RNA_def_property_range(prop, 0.0f, 1.0f);