Vertex Paint: Alpha Support

GSOC 2017 by Darshan Kadu, see: D2859.

This is a partial merge of some of the features from
the soc-2017-vertex_paint branch.

- Alpha painting & drawing.
- 10 new color blending modes.
- Support for vertex select in vertex paint mode.

1 files changed, 16 insertions, 3 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index 7b3636f1615..fe8e1bb7e6e 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -94,8 +94,21 @@ EnumPropertyItem rna_enum_brush_vertex_tool_items[] = {
 	{PAINT_BLEND_BLUR, "BLUR", ICON_BRUSH_BLUR, "Blur", "Blur the color with surrounding values"},
 	{PAINT_BLEND_LIGHTEN, "LIGHTEN", ICON_BRUSH_LIGHTEN, "Lighten", "Use lighten blending mode while painting"},
 	{PAINT_BLEND_DARKEN, "DARKEN", ICON_BRUSH_DARKEN, "Darken", "Use darken blending mode while painting"},
-	{PAINT_BLEND_AVERAGE, "AVERAGE", ICON_BRUSH_BLUR, "Average", "Use average blending mode while painting" },
-	{PAINT_BLEND_SMEAR, "SMEAR", ICON_BRUSH_BLUR, "Smear", "Use smear blending mode while painting" },
+	{PAINT_BLEND_AVERAGE, "AVERAGE", ICON_BRUSH_BLUR, "Average", "Use average blending mode while painting"},
+	{PAINT_BLEND_SMEAR, "SMEAR", ICON_BRUSH_BLUR, "Smear", "Use smear blending mode while painting"},
+	{PAINT_BLEND_COLORDODGE, "COLORDODGE", ICON_BRUSH_BLUR, "Color Dodge", "Use color dodge blending mode while painting" },
+	{PAINT_BLEND_DIFFERENCE, "DIFFERENCE", ICON_BRUSH_BLUR, "Difference", "Use difference blending mode while painting"},
+	{PAINT_BLEND_SCREEN, "SCREEN", ICON_BRUSH_BLUR, "Screen", "Use screen blending mode while painting"},
+	{PAINT_BLEND_HARDLIGHT, "HARDLIGHT", ICON_BRUSH_BLUR, "Hardlight", "Use hardlight blending mode while painting"},
+	{PAINT_BLEND_OVERLAY, "OVERLAY", ICON_BRUSH_BLUR, "Overlay", "Use overlay blending mode while painting"},
+	{PAINT_BLEND_SOFTLIGHT, "SOFTLIGHT", ICON_BRUSH_BLUR, "Softlight", "Use softlight blending mode while painting"},
+	{PAINT_BLEND_EXCLUSION, "EXCLUSION", ICON_BRUSH_BLUR, "Exclusion", "Use exclusion blending mode while painting"},
+	{PAINT_BLEND_LUMINOCITY, "LUMINOCITY", ICON_BRUSH_BLUR, "Luminocity", "Use luminocity blending mode while painting"},
+	{PAINT_BLEND_SATURATION, "SATURATION", ICON_BRUSH_BLUR, "Saturation", "Use saturation blending mode while painting"},
+	{PAINT_BLEND_HUE, "HUE", ICON_BRUSH_BLUR, "Hue", "Use hue blending mode while painting"},
+	{PAINT_BLEND_ALPHA_SUB, "ERASE_ALPHA", 0, "Erase Alpha", "Erase alpha while painting"},
+	{PAINT_BLEND_ALPHA_ADD, "ADD_ALPHA", 0, "Add Alpha", "Add alpha while painting"},
+
 	{0, NULL, 0, NULL, NULL}
 };
 	
@@ -1250,7 +1263,7 @@ static void rna_def_brush(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Restore Mesh", "Allow a single dot to be carefully positioned");
 	RNA_def_property_update(prop, 0, "rna_Brush_update");
 
-	/* only for projection paint, TODO, other paint modes */
+	/* only for projection paint & vertex paint, TODO, other paint modes */
 	prop = RNA_def_property(srna, "use_alpha", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", BRUSH_LOCK_ALPHA);
 	RNA_def_property_ui_text(prop, "Alpha", "When this is disabled, lock alpha while painting");