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.

17 files changed, 645 insertions, 87 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index 88693600653..015fd7c8a14 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -220,6 +220,7 @@ typedef struct SculptSession {
 
 			/* For non-airbrush painting to re-apply from the original (MLoop aligned). */
 			unsigned int *previous_color;
+			unsigned int *previous_accum;
 		} vpaint;
 
 		struct {
diff --git a/source/blender/blenkernel/intern/cdderivedmesh.c b/source/blender/blenkernel/intern/cdderivedmesh.c
index e97de07752e..2ed5cc450a4 100644
--- a/source/blender/blenkernel/intern/cdderivedmesh.c
+++ b/source/blender/blenkernel/intern/cdderivedmesh.c
@@ -752,8 +752,18 @@ static void cdDM_drawMappedFaces(
 		/* avoid buffer problems in following code */
 	}
 	else if (setDrawOptions == NULL) {
+		const bool show_alpha = true;
+		if (show_alpha) {
+			glEnable(GL_BLEND);
+			glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+		}
+
 		/* just draw the entire face array */
 		GPU_buffer_draw_elements(dm->drawObject->triangles, GL_TRIANGLES, 0, tot_tri_elem);
+
+		if (show_alpha) {
+			glDisable(GL_BLEND);
+		}
 	}
 	else {
 		for (mat_index = 0; mat_index < dm->drawObject->totmaterial; mat_index++) {
@@ -1525,8 +1535,8 @@ static void cdDM_buffer_copy_mcol(
 
 	for (i = 0; i < totpoly; i++, mpoly++) {
 		for (j = 0; j < mpoly->totloop; j++) {
-			copy_v3_v3_uchar(&varray[start], &mloopcol[mpoly->loopstart + j].r);
-			start += 3;
+			copy_v4_v4_uchar(&varray[start], &mloopcol[mpoly->loopstart + j].r);
+			start += 4;
 		}
 	}
 }
diff --git a/source/blender/blenkernel/intern/paint.c b/source/blender/blenkernel/intern/paint.c
index 25ea6ad079f..05d53ae4771 100644
--- a/source/blender/blenkernel/intern/paint.c
+++ b/source/blender/blenkernel/intern/paint.c
@@ -466,7 +466,7 @@ bool BKE_paint_select_vert_test(Object *ob)
 	         (ob->type == OB_MESH) &&
 	         (ob->data != NULL) &&
 	         (((Mesh *)ob->data)->editflag & ME_EDIT_PAINT_VERT_SEL) &&
-	         (ob->mode & OB_MODE_WEIGHT_PAINT)
+	         (ob->mode & OB_MODE_WEIGHT_PAINT || ob->mode & OB_MODE_VERTEX_PAINT)
 	         );
 }
 
@@ -680,6 +680,7 @@ void BKE_sculptsession_free_vwpaint_data(struct SculptSession *ss)
 		gmap = &ss->mode.vpaint.gmap;
 
 		MEM_SAFE_FREE(ss->mode.vpaint.previous_color);
+		MEM_SAFE_FREE(ss->mode.vpaint.previous_accum);
 	}
 	else if (ss->mode_type == OB_MODE_WEIGHT_PAINT) {
 		gmap = &ss->mode.wpaint.gmap;
@@ -737,7 +738,10 @@ void BKE_sculptsession_bm_to_me_for_render(Object *object)
 			 */
 			BKE_object_free_derived_caches(object);
 
-			MEM_SAFE_FREE(object->sculpt->pbvh);
+			if (object->sculpt->pbvh) {
+				BKE_pbvh_free(object->sculpt->pbvh);
+				object->sculpt->pbvh = NULL;
+			}
 
 			sculptsession_bm_to_me_update_data_only(object, false);
 
diff --git a/source/blender/blenloader/intern/versioning_270.c b/source/blender/blenloader/intern/versioning_270.c
index 40fed37b1b0..8459e080f99 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -1653,6 +1653,23 @@ void blo_do_versions_270(FileData *fd, Library *UNUSED(lib), Main *main)
 			}
 		}
 
+		{
+			Brush *br;
+			br = (Brush *)BKE_libblock_find_name_ex(main, ID_BR, "Average");
+			if (!br) {
+				br = BKE_brush_add(main, "Average", OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT);
+				br->vertexpaint_tool = PAINT_BLEND_AVERAGE;
+				br->ob_mode = OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT;
+			}
+
+			br = (Brush *)BKE_libblock_find_name_ex(main, ID_BR, "Smear");
+			if (!br) {
+				br = BKE_brush_add(main, "Smear", OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT);
+				br->vertexpaint_tool = PAINT_BLEND_SMEAR;
+				br->ob_mode = OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT;
+			}
+		}
+
 		FOREACH_NODETREE(main, ntree, id) {
 			if (ntree->type == NTREE_COMPOSIT) {
 				do_versions_compositor_render_passes(ntree);
diff --git a/source/blender/editors/include/ED_mesh.h b/source/blender/editors/include/ED_mesh.h
index de798b1fce2..c867df2d01a 100644
--- a/source/blender/editors/include/ED_mesh.h
+++ b/source/blender/editors/include/ED_mesh.h
@@ -282,6 +282,7 @@ bool ED_mesh_uv_texture_remove_active(struct Mesh *me);
 bool ED_mesh_uv_texture_remove_named(struct Mesh *me, const char *name);
 void ED_mesh_uv_loop_reset(struct bContext *C, struct Mesh *me);
 void ED_mesh_uv_loop_reset_ex(struct Mesh *me, const int layernum);
+bool ED_mesh_color_ensure(struct Mesh *me, const char *name);
 int  ED_mesh_color_add(struct Mesh *me, const char *name, const bool active_set);
 bool ED_mesh_color_remove_index(struct Mesh *me, const int n);
 bool ED_mesh_color_remove_active(struct Mesh *me);
diff --git a/source/blender/editors/mesh/mesh_data.c b/source/blender/editors/mesh/mesh_data.c
index 3294490d5b1..737c8ac665d 100644
--- a/source/blender/editors/mesh/mesh_data.c
+++ b/source/blender/editors/mesh/mesh_data.c
@@ -464,6 +464,20 @@ int ED_mesh_color_add(Mesh *me, const char *name, const bool active_set)
 	return layernum;
 }
 
+bool ED_mesh_color_ensure(struct Mesh *me, const char *name)
+{
+	BLI_assert(me->edit_btmesh == NULL);
+
+	if (!me->mloopcol && me->totloop) {
+		CustomData_add_layer_named(&me->ldata, CD_MLOOPCOL, CD_DEFAULT, NULL, me->totloop, name);
+		BKE_mesh_update_customdata_pointers(me, true);
+	}
+
+	DAG_id_tag_update(&me->id, 0);
+
+	return (me->mloopcol != NULL);
+}
+
 bool ED_mesh_color_remove_index(Mesh *me, const int n)
 {
 	CustomData *ldata = GET_CD_DATA(me, ldata);
diff --git a/source/blender/editors/sculpt_paint/CMakeLists.txt b/source/blender/editors/sculpt_paint/CMakeLists.txt
index 46753df4e13..fa669d236b9 100644
--- a/source/blender/editors/sculpt_paint/CMakeLists.txt
+++ b/source/blender/editors/sculpt_paint/CMakeLists.txt
@@ -52,6 +52,7 @@ set(SRC
 	paint_undo.c
 	paint_utils.c
 	paint_vertex.c
+	paint_vertex_color_ops.c
 	paint_vertex_proj.c
 	sculpt.c
 	sculpt_undo.c
diff --git a/source/blender/editors/sculpt_paint/paint_intern.h b/source/blender/editors/sculpt_paint/paint_intern.h
index 0ec7d97a04d..16570b0fdde 100644
--- a/source/blender/editors/sculpt_paint/paint_intern.h
+++ b/source/blender/editors/sculpt_paint/paint_intern.h
@@ -123,6 +123,8 @@ void PAINT_OT_vertex_paint(struct wmOperatorType *ot);
 
 unsigned int vpaint_get_current_col(struct Scene *scene, struct VPaint *vp);
 
+/* paint_vertex_color_ops.c */
+void PAINT_OT_vertex_color_from_weight(struct wmOperatorType *ot);
 
 /* paint_vertex_proj.c */
 struct VertProjHandle;
diff --git a/source/blender/editors/sculpt_paint/paint_ops.c b/source/blender/editors/sculpt_paint/paint_ops.c
index 4ebf14ed0b9..23231b7ccc7 100644
--- a/source/blender/editors/sculpt_paint/paint_ops.c
+++ b/source/blender/editors/sculpt_paint/paint_ops.c
@@ -1349,6 +1349,7 @@ void ED_operatortypes_paint(void)
 	WM_operatortype_append(PAINT_OT_vertex_color_hsv);
 	WM_operatortype_append(PAINT_OT_vertex_color_invert);
 	WM_operatortype_append(PAINT_OT_vertex_color_levels);
+	WM_operatortype_append(PAINT_OT_vertex_color_from_weight);
 
 	/* face-select */
 	WM_operatortype_append(PAINT_OT_face_select_linked);
diff --git a/source/blender/editors/sculpt_paint/paint_vertex.c b/source/blender/editors/sculpt_paint/paint_vertex.c
index a88b834d601..18b71dedc07 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex.c
+++ b/source/blender/editors/sculpt_paint/paint_vertex.c
@@ -83,6 +83,8 @@
 #include "sculpt_intern.h"
 #include "paint_intern.h"  /* own include */
 
+#define EPS_SATURATION 0.0005f
+
 /* Use for 'blur' brush, align with PBVH nodes, created and freed on each update. */
 struct VPaintAverageAccum {
 	uint len;
@@ -256,29 +258,6 @@ static void do_shared_vertexcol(Mesh *me, bool *mlooptag)
 	MEM_freeN(scol);
 }
 
-static bool make_vertexcol(Object *ob)  /* single ob */
-{
-	Mesh *me;
-
-	if (ID_IS_LINKED_DATABLOCK(ob) ||
-	    ((me = BKE_mesh_from_object(ob)) == NULL) ||
-	    (me->totpoly == 0) ||
-	    (me->edit_btmesh))
-	{
-		return false;
-	}
-
-	/* copies from shadedisplist to mcol */
-	if (!me->mloopcol && me->totloop) {
-		CustomData_add_layer(&me->ldata, CD_MLOOPCOL, CD_DEFAULT, NULL, me->totloop);
-		BKE_mesh_update_customdata_pointers(me, true);
-	}
-
-	DAG_id_tag_update(&me->id, 0);
-	
-	return (me->mloopcol != NULL);
-}
-
 /* mirror_vgroup is set to -1 when invalid */
 static int wpaint_mirror_vgroup_ensure(Object *ob, const int vgroup_active)
 {
@@ -342,12 +321,13 @@ bool ED_vpaint_fill(Object *ob, uint paintcol)
 	int i, j;
 
 	if (((me = BKE_mesh_from_object(ob)) == NULL) ||
-	    (me->mloopcol == NULL && (make_vertexcol(ob) == false)))
+	    (ED_mesh_color_ensure(me, NULL) == false))
 	{
 		return false;
 	}
 
 	const bool use_face_sel = (me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
+	const bool use_vert_sel = (me->editflag & ME_EDIT_PAINT_VERT_SEL) != 0;
 
 	mp = me->mpoly;
 	for (i = 0; i < me->totpoly; i++, mp++) {
@@ -356,9 +336,16 @@ bool ED_vpaint_fill(Object *ob, uint paintcol)
 		if (use_face_sel && !(mp->flag & ME_FACE_SEL))
 			continue;
 
-		for (j = 0; j < mp->totloop; j++, lcol++) {
-			*(int *)lcol = paintcol;
-		}
+		j = 0;
+		do {
+			uint vidx = me->mloop[mp->loopstart + j].v;
+			if (!(use_vert_sel && !(me->mvert[vidx].flag & SELECT))) {
+				*(int *)lcol = paintcol;
+			}
+			lcol++;
+			j++;
+		} while (j < mp->totloop);
+
 	}
 	
 	/* remove stale me->mcol, will be added later */
@@ -465,7 +452,7 @@ bool ED_vpaint_smooth(Object *ob)
 	bool *mlooptag;
 
 	if (((me = BKE_mesh_from_object(ob)) == NULL) ||
-	    (me->mloopcol == NULL && (make_vertexcol(ob) == false)))
+	    (ED_mesh_color_ensure(me, NULL) == false))
 	{
 		return false;
 	}
@@ -512,7 +499,7 @@ bool ED_vpaint_color_transform(
 	const MPoly *mp;
 
 	if (((me = BKE_mesh_from_object(ob)) == NULL) ||
-	    (me->mloopcol == NULL && (make_vertexcol(ob) == false)))
+	    (ED_mesh_color_ensure(me, NULL) == false))
 	{
 		return false;
 	}
@@ -612,15 +599,17 @@ BLI_INLINE uint mcol_blend(uint col1, uint col2, int fac)
 	int r1 = cp1[0] * cp1[0];
 	int g1 = cp1[1] * cp1[1];
 	int b1 = cp1[2] * cp1[2];
+	int a1 = cp1[3] * cp1[3];
 
 	int r2 = cp2[0] * cp2[0];
 	int g2 = cp2[1] * cp2[1];
 	int b2 = cp2[2] * cp2[2];
+	int a2 = cp2[3] * cp2[3];
 
 	cp[0] = round_fl_to_uchar(sqrtf(divide_round_i((mfac * r1 + fac * r2), 255)));
 	cp[1] = round_fl_to_uchar(sqrtf(divide_round_i((mfac * g1 + fac * g2), 255)));
 	cp[2] = round_fl_to_uchar(sqrtf(divide_round_i((mfac * b1 + fac * b2), 255)));
-	cp[3] = 255;
+	cp[3] = round_fl_to_uchar(sqrtf(divide_round_i((mfac * a1 + fac * a2), 255)));
 
 	return col;
 }
@@ -645,7 +634,8 @@ BLI_INLINE uint mcol_add(uint col1, uint col2, int fac)
 	cp[1] = (temp > 254) ? 255 : temp;
 	temp = cp1[2] + divide_round_i((fac * cp2[2]), 255);
 	cp[2] = (temp > 254) ? 255 : temp;
-	cp[3] = 255;
+	temp = cp1[3] + divide_round_i((fac * cp2[3]), 255);
+	cp[3] = (temp > 254) ? 255 : temp;
 	
 	return col;
 }
@@ -670,7 +660,8 @@ BLI_INLINE uint mcol_sub(uint col1, uint col2, int fac)
 	cp[1] = (temp < 0) ? 0 : temp;
 	temp = cp1[2] - divide_round_i((fac * cp2[2]), 255);
 	cp[2] = (temp < 0) ? 0 : temp;
-	cp[3] = 255;
+	temp = cp1[3] - divide_round_i((fac * cp2[3]), 255);
+	cp[3] = (temp < 0) ? 0 : temp;
 
 	return col;
 }
@@ -695,7 +686,7 @@ BLI_INLINE uint mcol_mul(uint col1, uint col2, int fac)
 	cp[0] = divide_round_i(mfac * cp1[0] * 255 + fac * cp2[0] * cp1[0], 255 * 255);
 	cp[1] = divide_round_i(mfac * cp1[1] * 255 + fac * cp2[1] * cp1[1], 255 * 255);
 	cp[2] = divide_round_i(mfac * cp1[2] * 255 + fac * cp2[2] * cp1[2], 255 * 255);
-	cp[3] = 255;
+	cp[3] = divide_round_i(mfac * cp1[3] * 255 + fac * cp2[3] * cp1[3], 255 * 255);
 
 	return col;
 }
@@ -728,7 +719,7 @@ BLI_INLINE uint mcol_lighten(uint col1, uint col2, int fac)
 	cp[0] = divide_round_i(mfac * cp1[0] + fac * cp2[0], 255);
 	cp[1] = divide_round_i(mfac * cp1[1] + fac * cp2[1], 255);
 	cp[2] = divide_round_i(mfac * cp1[2] + fac * cp2[2], 255);
-	cp[3] = 255;
+	cp[3] = divide_round_i(mfac * cp1[3] + fac * cp2[3], 255);
 
 	return col;
 }
@@ -761,24 +752,373 @@ BLI_INLINE uint mcol_darken(uint col1, uint col2, int fac)
 	cp[0] = divide_round_i((mfac * cp1[0] + fac * cp2[0]), 255);
 	cp[1] = divide_round_i((mfac * cp1[1] + fac * cp2[1]), 255);
 	cp[2] = divide_round_i((mfac * cp1[2] + fac * cp2[2]), 255);
-	cp[3] = 255;
+	cp[3] = divide_round_i((mfac * cp1[3] + fac * cp2[3]), 255);
+	return col;
+}
+
+BLI_INLINE uint mcol_colordodge(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac,temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	temp = (cp2[0] == 255) ? 255 : min_ii((cp1[0] * 225) / (255 - cp2[0]), 255);
+	cp[0] = (mfac * cp1[0] + temp * fac) / 255;
+	temp = (cp2[1] == 255) ? 255 : min_ii((cp1[1] * 225) / (255 - cp2[1]), 255);
+	cp[1] = (mfac * cp1[1] + temp * fac) / 255;
+	temp = (cp2[2] == 255) ? 255 : min_ii((cp1[2] * 225 )/ (255 - cp2[2]), 255);
+	cp[2] = (mfac * cp1[2] + temp * fac) / 255;
+	temp = (cp2[3] == 255) ? 255 : min_ii((cp1[3] * 225) / (255 - cp2[3]), 255);
+	cp[3] = (mfac * cp1[3] + temp * fac) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_difference(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	temp = abs(cp1[0] - cp2[0]);
+	cp[0] = (mfac * cp1[0] + temp * fac) / 255;
+	temp = abs(cp1[1] - cp2[1]);
+	cp[1] = (mfac * cp1[1] + temp * fac) / 255;
+	temp = abs(cp1[2] - cp2[2]);
+	cp[2] = (mfac * cp1[2] + temp * fac) / 255;
+	temp = abs(cp1[3] - cp2[3]);
+	cp[3] = (mfac * cp1[3] + temp * fac) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_screen(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	temp = max_ii(255 - (((255 - cp1[0]) * (255 - cp2[0])) / 255), 0);
+	cp[0] = (mfac * cp1[0] + temp * fac) / 255;
+	temp = max_ii(255 - (((255 - cp1[1]) * (255 - cp2[1])) / 255), 0);
+	cp[1] = (mfac * cp1[1] + temp * fac) / 255;
+	temp = max_ii(255 - (((255 - cp1[2]) * (255 - cp2[2])) / 255), 0);
+	cp[2] = (mfac * cp1[2] + temp * fac) / 255;
+	temp = max_ii(255 - (((255 - cp1[3]) * (255 - cp2[3])) / 255), 0);
+	cp[3] = (mfac * cp1[3] + temp * fac) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_hardlight(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	int i = 0;
+
+	for (i = 0; i < 4; i++) {
+		if (cp2[i] > 127) {
+			temp = 255 - ((255 - 2 * (cp2[i] - 127)) * (255 - cp1[i]) / 255);
+		}
+		else {
+			temp = (2 * cp2[i] * cp1[i]) >> 8;
+		}
+		cp[i] = min_ii((mfac * cp1[i] + temp * fac) / 255, 255);
+	}
+	return col;
+}
+
+BLI_INLINE uint mcol_overlay(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	int i = 0;
+
+	for (i = 0; i < 4; i++) {
+		if (cp1[i] > 127) {
+			temp = 255 - ((255 - 2 * (cp1[i] - 127)) * (255 - cp2[i]) / 255);
+		}
+		else {
+			temp = (2 * cp2[i] * cp1[i]) >> 8;
+		}
+		cp[i] = min_ii((mfac * cp1[i] + temp * fac) / 255, 255);
+	}
+	return col;
+}
+
+BLI_INLINE uint mcol_softlight(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	int i = 0;
+
+	for (i = 0; i < 4; i++) {
+		if (cp1[i] < 127) {
+			temp = ((2 * ((cp2[i] / 2) + 64)) * cp1[i]) / 255;
+		}
+		else {
+			temp = 255 - (2 * (255 - ((cp2[i] / 2) + 64)) * (255 - cp1[i]) / 255);
+		}
+		cp[i] = (temp * fac + cp1[i] * mfac) / 255;
+	}
+	return col;
+}
+
+BLI_INLINE uint mcol_exclusion(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac, temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	int i = 0;
+
+	for (i = 0; i < 4; i++) {
+		temp = 127 - ((2 * (cp1[i] - 127) * (cp2[i] - 127)) / 255);
+		cp[i] = (temp * fac + cp1[i] * mfac) / 255;
+	}
+	return col;
+}
+
+BLI_INLINE uint mcol_luminosity(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	float h1, s1, v1;
+	float h2, s2, v2;
+	float r, g, b;
+	rgb_to_hsv(cp1[0] / 255.0f, cp1[1] / 255.0f, cp1[2] / 255.0f, &h1, &s1, &v1);
+	rgb_to_hsv(cp2[0] / 255.0f, cp2[1] / 255.0f, cp2[2] / 255.0f, &h2, &s2, &v2);
+
+	v1 = v2;
+
+	hsv_to_rgb(h1, s1, v1, &r, &g, &b);
+
+	cp[0] = ((int)(r * 255.0f) * fac + mfac * cp1[0]) / 255;
+	cp[1] = ((int)(g * 255.0f) * fac + mfac * cp1[1]) / 255;
+	cp[2] = ((int)(b * 255.0f) * fac + mfac * cp1[2]) / 255;
+	cp[3] = ((int)(cp2[3])     * fac + mfac * cp1[3]) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_saturation(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	float h1, s1, v1;
+	float h2, s2, v2;
+	float r, g, b;
+	rgb_to_hsv(cp1[0] / 255.0f, cp1[1] / 255.0f, cp1[2] / 255.0f, &h1, &s1, &v1);
+	rgb_to_hsv(cp2[0] / 255.0f, cp2[1] / 255.0f, cp2[2] / 255.0f, &h2, &s2, &v2);
+
+	if (s1 > EPS_SATURATION) {
+		s1 = s2;
+	}
+
+	hsv_to_rgb(h1, s1, v1, &r, &g, &b);
+
+	cp[0] = ((int)(r * 255.0f) * fac + mfac * cp1[0]) / 255;
+	cp[1] = ((int)(g * 255.0f) * fac + mfac * cp1[1]) / 255;
+	cp[2] = ((int)(b * 255.0f) * fac + mfac * cp1[2]) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_hue(uint col1, uint col2, int fac)
+{
+	uchar *cp1, *cp2, *cp;
+	int mfac;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	mfac = 255 - fac;
+
+	cp1 = (uchar *)&col1;
+	cp2 = (uchar *)&col2;
+	cp = (uchar *)&col;
+
+	float h1, s1, v1;
+	float h2, s2, v2;
+	float r, g, b;
+	rgb_to_hsv(cp1[0] / 255.0f, cp1[1] / 255.0f, cp1[2] / 255.0f, &h1, &s1, &v1);
+	rgb_to_hsv(cp2[0] / 255.0f, cp2[1] / 255.0f, cp2[2] / 255.0f, &h2, &s2, &v2);
+
+	h1 = h2;
+
+	hsv_to_rgb(h1, s1, v1, &r, &g, &b);
+
+	cp[0] = ((int)(r * 255.0f) * fac + mfac * cp1[0]) / 255;
+	cp[1] = ((int)(g * 255.0f) * fac + mfac * cp1[1]) / 255;
+	cp[2] = ((int)(b * 255.0f) * fac + mfac * cp1[2]) / 255;
+	cp[3] = ((int)(cp2[3])     * fac + mfac * cp1[3]) / 255;
+	return col;
+}
+
+BLI_INLINE uint mcol_alpha_add(uint col1, int fac)
+{
+	uchar *cp1, *cp;
+	int temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	cp1 = (uchar *)&col1;
+	cp  = (uchar *)&col;
+
+	temp = cp1[3] + fac;
+	cp[3] = (temp > 254) ? 255 : temp;
+
 	return col;
 }
 
+BLI_INLINE uint mcol_alpha_sub(uint col1, int fac)
+{
+	uchar *cp1, *cp;
+	int temp;
+	uint col = 0;
+
+	if (fac == 0) {
+		return col1;
+	}
+
+	cp1 = (uchar *)&col1;
+	cp  = (uchar *)&col;
+
+	temp = cp1[3] - fac;
+	cp[3] = temp < 0 ? 0 : temp;
+
+	return col;
+}
+
+
 /* wpaint has 'wpaint_blend_tool' */
-static uint vpaint_blend_tool(const int tool, const uint col,
-                                      const uint paintcol, const int alpha_i)
+static uint vpaint_blend_tool(
+        const int tool, const uint col,
+        const uint paintcol, const int alpha_i)
 {
 	switch (tool) {
 		case PAINT_BLEND_MIX:
-		case PAINT_BLEND_BLUR:     return mcol_blend(col, paintcol, alpha_i);
-		case PAINT_BLEND_AVERAGE:  return mcol_blend(col, paintcol, alpha_i);
-		case PAINT_BLEND_SMEAR:    return mcol_blend(col, paintcol, alpha_i);
-		case PAINT_BLEND_ADD:      return mcol_add(col, paintcol, alpha_i);
-		case PAINT_BLEND_SUB:      return mcol_sub(col, paintcol, alpha_i);
-		case PAINT_BLEND_MUL:      return mcol_mul(col, paintcol, alpha_i);
-		case PAINT_BLEND_LIGHTEN:  return mcol_lighten(col, paintcol, alpha_i);
-		case PAINT_BLEND_DARKEN:   return mcol_darken(col, paintcol, alpha_i);
+		case PAINT_BLEND_BLUR:       return mcol_blend(col, paintcol, alpha_i);
+		case PAINT_BLEND_AVERAGE:    return mcol_blend(col, paintcol, alpha_i);
+		case PAINT_BLEND_SMEAR:      return mcol_blend(col, paintcol, alpha_i);
+		case PAINT_BLEND_ADD:        return mcol_add(col, paintcol, alpha_i);
+		case PAINT_BLEND_SUB:        return mcol_sub(col, paintcol, alpha_i);
+		case PAINT_BLEND_MUL:        return mcol_mul(col, paintcol, alpha_i);
+		case PAINT_BLEND_LIGHTEN:    return mcol_lighten(col, paintcol, alpha_i);
+		case PAINT_BLEND_DARKEN:     return mcol_darken(col, paintcol, alpha_i);
+		case PAINT_BLEND_COLORDODGE: return mcol_colordodge(col, paintcol, alpha_i);
+		case PAINT_BLEND_DIFFERENCE: return mcol_difference(col, paintcol, alpha_i);
+		case PAINT_BLEND_SCREEN:     return mcol_screen(col, paintcol, alpha_i);
+		case PAINT_BLEND_HARDLIGHT:  return mcol_hardlight(col, paintcol, alpha_i);
+		case PAINT_BLEND_OVERLAY:    return mcol_overlay(col, paintcol, alpha_i);
+		case PAINT_BLEND_SOFTLIGHT:  return mcol_softlight(col, paintcol, alpha_i);
+		case PAINT_BLEND_EXCLUSION:  return mcol_exclusion(col, paintcol, alpha_i);
+		case PAINT_BLEND_LUMINOCITY: return mcol_luminosity(col, paintcol, alpha_i);
+		case PAINT_BLEND_SATURATION: return mcol_saturation(col, paintcol, alpha_i);
+		case PAINT_BLEND_HUE:        return mcol_hue(col, paintcol, alpha_i);
+		/* non-color */
+		case PAINT_BLEND_ALPHA_SUB:  return mcol_alpha_sub(col, alpha_i);
+		case PAINT_BLEND_ALPHA_ADD:  return mcol_alpha_add(col, alpha_i);
 		default:
 			BLI_assert(0);
 			return 0;
@@ -787,27 +1127,27 @@ static uint vpaint_blend_tool(const int tool, const uint col,
 
 /* wpaint has 'wpaint_blend' */
 static uint vpaint_blend(
-        VPaint *vp, uint col, uint colorig,
-        const uint paintcol, const int alpha_i,
+        VPaint *vp, uint color_curr, uint color_orig,
+        uint color_paint, const int alpha_i,
         /* pre scaled from [0-1] --> [0-255] */
         const int brush_alpha_value_i)
 {
 	Brush *brush = BKE_paint_brush(&vp->paint);
 	const int tool = brush->vertexpaint_tool;
 
-	col = vpaint_blend_tool(tool, col, paintcol, alpha_i);
+	uint color_blend = vpaint_blend_tool(tool, color_curr, color_paint, alpha_i);
 
 	/* if no spray, clip color adding with colorig & orig alpha */
 	if ((vp->flag & VP_SPRAY) == 0) {
-		uint testcol, a;
+		uint color_test, a;
 		char *cp, *ct, *co;
-		
-		testcol = vpaint_blend_tool(tool, colorig, paintcol, brush_alpha_value_i);
-		
-		cp = (char *)&col;
-		ct = (char *)&testcol;
-		co = (char *)&colorig;
-		
+
+		color_test = vpaint_blend_tool(tool, color_orig, color_paint, brush_alpha_value_i);
+
+		cp = (char *)&color_blend;
+		ct = (char *)&color_test;
+		co = (char *)&color_orig;
+
 		for (a = 0; a < 4; a++) {
 			if (ct[a] < co[a]) {
 				if (cp[a] < ct[a]) cp[a] = ct[a];
@@ -820,7 +1160,16 @@ static uint vpaint_blend(
 		}
 	}
 
-	return col;
+	if ((brush->flag & BRUSH_LOCK_ALPHA) &&
+	    !ELEM(tool, PAINT_BLEND_ALPHA_SUB, PAINT_BLEND_ALPHA_ADD))
+	{
+		char *cp, *cc;
+		cp = (char *)&color_blend;
+		cc = (char *)&color_curr;
+		cp[3] = cc[3];
+	}
+
+	return color_blend;
 }
 
 
@@ -1738,12 +2087,15 @@ static void vertex_paint_init_session_data(const ToolSettings *ts, Object *ob)
 {
 	/* Create maps */
 	struct SculptVertexPaintGeomMap *gmap = NULL;
+	const Brush *brush = NULL;
 	if (ob->mode == OB_MODE_VERTEX_PAINT) {
 		gmap = &ob->sculpt->mode.vpaint.gmap;
+		brush = BKE_paint_brush(&ts->vpaint->paint);
 		ob->sculpt->mode_type = OB_MODE_VERTEX_PAINT;
 	}
 	else if (ob->mode == OB_MODE_WEIGHT_PAINT) {
 		gmap = &ob->sculpt->mode.wpaint.gmap;
+		brush = BKE_paint_brush(&ts->wpaint->paint);
 		ob->sculpt->mode_type = OB_MODE_WEIGHT_PAINT;
 	}
 	else {
@@ -1780,6 +2132,16 @@ static void vertex_paint_init_session_data(const ToolSettings *ts, Object *ob)
 		else {
 			MEM_SAFE_FREE(ob->sculpt->mode.vpaint.previous_color);
 		}
+
+		if (brush && brush->flag & BRUSH_ACCUMULATE) {
+			if (ob->sculpt->mode.vpaint.previous_accum == NULL) {
+				ob->sculpt->mode.vpaint.previous_accum =
+				        MEM_callocN(me->totloop * sizeof(uint), "previous_color");
+			}
+		}
+		else {
+			MEM_SAFE_FREE(ob->sculpt->mode.vpaint.previous_accum);
+		}
 	}
 	else if (ob->mode == OB_MODE_WEIGHT_PAINT) {
 		if ((ts->wpaint->flag & VP_SPRAY) == 0) {
@@ -3104,6 +3466,9 @@ static int vpaint_mode_toggle_exec(bContext *C, wmOperator *op)
 		if (me->editflag & ME_EDIT_PAINT_FACE_SEL) {
 			BKE_mesh_flush_select_from_polys(me);
 		}
+		else if (me->editflag & ME_EDIT_PAINT_VERT_SEL) {
+			BKE_mesh_flush_select_from_verts(me);
+		}
 
 		/* If the cache is not released by a cancel or a done, free it now. */
 		if (ob->sculpt->cache) {
@@ -3118,9 +3483,7 @@ static int vpaint_mode_toggle_exec(bContext *C, wmOperator *op)
 	else {
 		ob->mode |= mode_flag;
 
-		if (me->mloopcol == NULL) {
-			make_vertexcol(ob);
-		}
+		ED_mesh_color_ensure(me, NULL);
 
 		if (vp == NULL)
 			vp = scene->toolsettings->vpaint = new_vpaint(0);
@@ -3229,8 +3592,7 @@ static bool vpaint_stroke_test_start(bContext *C, struct wmOperator *op, const f
 	if (me == NULL || me->totpoly == 0)
 		return false;
 	
-	if (me->mloopcol == NULL)
-		make_vertexcol(ob);
+	ED_mesh_color_ensure(me, NULL);
 	if (me->mloopcol == NULL)
 		return false;
 
@@ -3295,8 +3657,7 @@ static void do_vpaint_brush_calc_average_color_cb_ex(
 	StrokeCache *cache = ss->cache;
 	uint *lcol = data->lcol;
 	char *col;
-
-	const bool use_face_sel = (data->me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
+	const bool use_vert_sel = (data->me->editflag & (ME_EDIT_PAINT_FACE_SEL | ME_EDIT_PAINT_VERT_SEL)) != 0;
 
 	struct VPaintAverageAccum *accum = (struct VPaintAverageAccum *)data->custom_data + n;
 	accum->len = 0;
@@ -3315,7 +3676,7 @@ static void do_vpaint_brush_calc_average_color_cb_ex(
 			if (BKE_brush_curve_strength(data->brush, test.dist, cache->radius) > 0.0) {
 				/* If the vertex is selected for painting. */
 				const MVert *mv = &data->me->mvert[v_index];
-				if (!use_face_sel || mv->flag & SELECT) {
+				if (!use_vert_sel || mv->flag & SELECT) {
 					accum->len += gmap->vert_to_loop[v_index].count;
 					/* if a vertex is within the brush region, then add it's color to the blend. */
 					for (int j = 0; j < gmap->vert_to_loop[v_index].count; j++) {
@@ -3367,12 +3728,13 @@ static void do_vpaint_brush_draw_task_cb_ex(
 	Scene *scene = CTX_data_scene(data->C);
 	float brush_size_pressure, brush_alpha_value, brush_alpha_pressure;
 	get_brush_alpha_data(scene, ss, brush, &brush_size_pressure, &brush_alpha_value, &brush_alpha_pressure);
+	const bool use_vert_sel = (data->me->editflag & (ME_EDIT_PAINT_FACE_SEL | ME_EDIT_PAINT_VERT_SEL)) != 0;
 	const bool use_face_sel = (data->me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
 
 	SculptBrushTest test;
 	sculpt_brush_test_init(ss, &test);
 
-	/* For each vertex*/
+	/* For each vertex */
 	PBVHVertexIter vd;
 	BKE_pbvh_vertex_iter_begin(ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE)
 	{
@@ -3386,7 +3748,7 @@ static void do_vpaint_brush_draw_task_cb_ex(
 			const MVert *mv = &data->me->mvert[v_index];
 
 			/* If the vertex is selected for painting. */
-			if (!use_face_sel || mv->flag & SELECT) {
+			if (!use_vert_sel || mv->flag & SELECT) {
 				/* Calc the dot prod. between ray norm on surf and current vert
 				 * (ie splash prevention factor), and only paint front facing verts. */
 				const float view_dot = (vd.no) ? dot_vf3vs3(cache->sculpt_normal_symm, vd.no) : 1.0;
@@ -3416,9 +3778,16 @@ static void do_vpaint_brush_draw_task_cb_ex(
 								}
 								color_orig = ss->mode.vpaint.previous_color[l_index];
 							}
-							const float final_alpha =
+							float final_alpha =
 							        255 * brush_fade * brush_strength * view_dot *
 							        tex_alpha * brush_alpha_pressure * grid_alpha;
+
+							if (brush->flag & BRUSH_ACCUMULATE) {
+								float mask_accum = ss->mode.vpaint.previous_accum[l_index];
+								final_alpha = min_ff(final_alpha + mask_accum, 255.0f);
+								ss->mode.vpaint.previous_accum[l_index] = final_alpha;
+							}
+
 							/* Mix the new color with the original based on final_alpha. */
 							lcol[l_index] = vpaint_blend(
 							        data->vp, lcol[l_index], color_orig, color_final,
@@ -3447,6 +3816,7 @@ static void do_vpaint_brush_blur_task_cb_ex(
 	uint *lcol = data->lcol;
 	float brush_size_pressure, brush_alpha_value, brush_alpha_pressure;
 	get_brush_alpha_data(scene, ss, brush, &brush_size_pressure, &brush_alpha_value, &brush_alpha_pressure);
+	const bool use_vert_sel = (data->me->editflag & (ME_EDIT_PAINT_FACE_SEL | ME_EDIT_PAINT_VERT_SEL)) != 0;
 	const bool use_face_sel = (data->me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
 
 	SculptBrushTest test;
@@ -3459,7 +3829,7 @@ static void do_vpaint_brush_blur_task_cb_ex(
 		/* Test to see if the vertex coordinates are within the spherical brush region. */
 		if (sculpt_brush_test(&test, vd.co)) {
 			/* For grid based pbvh, take the vert whose loop cooresponds to the current grid. 
-			Otherwise, take the current vert. */
+			 * Otherwise, take the current vert. */
 			const int v_index = ccgdm ? data->me->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
 			const float grid_alpha = ccgdm ? 1.0f / vd.gridsize : 1.0f;
 			const MVert *mv = &data->me->mvert[v_index];
@@ -3469,7 +3839,7 @@ static void do_vpaint_brush_blur_task_cb_ex(
 				const float brush_fade = BKE_brush_curve_strength(brush, test.dist, cache->radius);
 
 				/* If the vertex is selected for painting. */
-				if (!use_face_sel || mv->flag & SELECT) {
+				if (!use_vert_sel || mv->flag & SELECT) {
 					/* Get the average poly color */
 					uint color_final = 0;
 					int total_hit_loops = 0;
@@ -3547,6 +3917,7 @@ static void do_vpaint_brush_smear_task_cb_ex(
 	float brush_size_pressure, brush_alpha_value, brush_alpha_pressure;
 	get_brush_alpha_data(scene, ss, brush, &brush_size_pressure, &brush_alpha_value, &brush_alpha_pressure);
 	float brush_dir[3];
+	const bool use_vert_sel = (data->me->editflag & (ME_EDIT_PAINT_FACE_SEL | ME_EDIT_PAINT_VERT_SEL)) != 0;
 	const bool use_face_sel = (data->me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
 
 	sub_v3_v3v3(brush_dir, cache->location, cache->last_location);
@@ -3562,15 +3933,15 @@ static void do_vpaint_brush_smear_task_cb_ex(
 			/* Test to see if the vertex coordinates are within the spherical brush region. */
 			if (sculpt_brush_test(&test, vd.co)) {
 				/* For grid based pbvh, take the vert whose loop cooresponds to the current grid.
-				Otherwise, take the current vert. */
+				 * Otherwise, take the current vert. */
 				const int v_index = ccgdm ? data->me->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
 				const float grid_alpha = ccgdm ? 1.0f / vd.gridsize : 1.0f;
 				const MVert *mv_curr = &data->me->mvert[v_index];
 
 				/* if the vertex is selected for painting. */
-				if (!use_face_sel || mv_curr->flag & SELECT) {
+				if (!use_vert_sel || mv_curr->flag & SELECT) {
 					/* Calc the dot prod. between ray norm on surf and current vert
-					(ie splash prevention factor), and only paint front facing verts. */
+					 * (ie splash prevention factor), and only paint front facing verts. */
 					const float view_dot = (vd.no) ? dot_vf3vs3(cache->sculpt_normal_symm, vd.no) : 1.0;
 					if (view_dot > 0.0f) {
 						const float brush_fade = BKE_brush_curve_strength(brush, test.dist, cache->radius);
diff --git a/source/blender/editors/sculpt_paint/paint_vertex_color_ops.c b/source/blender/editors/sculpt_paint/paint_vertex_color_ops.c
new file mode 100644
index 00000000000..5325d660f91
--- /dev/null
+++ b/source/blender/editors/sculpt_paint/paint_vertex_color_ops.c
@@ -0,0 +1,111 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/sculpt_paint/paint_vertex_color_ops.c
+ *  \ingroup edsculpt
+ */
+
+#include "MEM_guardedalloc.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+#include "DNA_object_types.h"
+
+#include "BKE_context.h"
+#include "BKE_depsgraph.h"
+#include "BKE_mesh.h"
+#include "BKE_deform.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "ED_mesh.h"
+
+#include "paint_intern.h"  /* own include */
+
+
+static int vertex_weight_paint_mode_poll(bContext *C)
+{
+	Object *ob = CTX_data_active_object(C);
+	Mesh *me = BKE_mesh_from_object(ob);
+	return (ob && (ob->mode == OB_MODE_VERTEX_PAINT || ob->mode == OB_MODE_WEIGHT_PAINT)) &&
+	       (me && me->totpoly && me->dvert);
+}
+
+static bool vertex_paint_from_weight(bContext *C)
+{
+	Object *ob = CTX_data_active_object(C);
+	Mesh *me;
+	const MPoly *mp;
+	int vgroup_active;
+
+	if (((me = BKE_mesh_from_object(ob)) == NULL ||
+	    (ED_mesh_color_ensure(me, NULL)) == false))
+	{
+		return false;
+	}
+
+	/* TODO: respect selection. */
+	mp = me->mpoly;
+	vgroup_active = ob->actdef - 1;
+	for (int i = 0; i < me->totpoly; i++, mp++) {
+		MLoopCol *lcol = &me->mloopcol[mp->loopstart];
+		uint j = 0;
+		do{
+			uint vidx = me->mloop[mp->loopstart + j].v;
+			const float weight = defvert_find_weight(&me->dvert[vidx], vgroup_active);
+			const uchar grayscale = weight * 255;
+			lcol->r = grayscale;
+			lcol->b = grayscale;
+			lcol->g = grayscale;
+			lcol++;
+			j++;
+		} while (j < mp->totloop);
+	}
+
+	DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
+	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);
+	return true;
+}
+
+static int vertex_paint_from_weight_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	if (vertex_paint_from_weight(C)) {
+		return OPERATOR_FINISHED;
+	}
+	return OPERATOR_CANCELLED;
+}
+
+void PAINT_OT_vertex_color_from_weight(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Vertex Color from Weight";
+	ot->idname = "PAINT_OT_vertex_color_from_weight";
+	ot->description = "Converts active weight into greyscale vertex colors";
+
+	/* api callback */
+	ot->exec = vertex_paint_from_weight_exec;
+	ot->poll = vertex_weight_paint_mode_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* TODO: invert, alpha */
+}
diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index 850d4631311..3d1c7e94d17 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -192,14 +192,14 @@ typedef struct {
 	bool original;
 } SculptSearchSphereData;
 
-void sculpt_brush_test_init(SculptSession *ss, SculptBrushTest *test);
+void sculpt_brush_test_init(struct SculptSession *ss, SculptBrushTest *test);
 bool sculpt_brush_test(SculptBrushTest *test, const float co[3]);
 bool sculpt_brush_test_sq(SculptBrushTest *test, const float co[3]);
 bool sculpt_brush_test_fast(const SculptBrushTest *test, const float co[3]);
 bool sculpt_brush_test_cube(SculptBrushTest *test, const float co[3], float local[4][4]);
 bool sculpt_search_sphere_cb(PBVHNode *node, void *data_v);
 float tex_strength(
-        SculptSession *ss, struct Brush *br,
+        struct SculptSession *ss, struct Brush *br,
         const float point[3],
         const float len,
         const short vno[3],
diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 73fd77db477..5f01092f5b0 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -8457,8 +8457,8 @@ void draw_object_backbufsel(Scene *scene, View3D *v3d, RegionView3D *rv3d, Objec
 			else {
 				Mesh *me = ob->data;
 				if ((me->editflag & ME_EDIT_PAINT_VERT_SEL) &&
-				    /* currently vertex select only supports weight paint */
-				    (ob->mode & OB_MODE_WEIGHT_PAINT))
+				    /* currently vertex select supports weight paint and vertex paint*/
+				    ((ob->mode & OB_MODE_WEIGHT_PAINT) || (ob->mode & OB_MODE_VERTEX_PAINT)))
 				{
 					bbs_mesh_solid_verts(scene, ob);
 				}
diff --git a/source/blender/editors/space_view3d/view3d_header.c b/source/blender/editors/space_view3d/view3d_header.c
index bf1bdf68619..70caee66b29 100644
--- a/source/blender/editors/space_view3d/view3d_header.c
+++ b/source/blender/editors/space_view3d/view3d_header.c
@@ -350,7 +350,7 @@ void uiTemplateHeader3D(uiLayout *layout, struct bContext *C)
 			PointerRNA meshptr;
 
 			RNA_pointer_create(ob->data, &RNA_Mesh, ob->data, &meshptr);
-			if (ob->mode & (OB_MODE_TEXTURE_PAINT | OB_MODE_VERTEX_PAINT)) {
+			if (ob->mode & (OB_MODE_TEXTURE_PAINT)) {
 				uiItemR(layout, &meshptr, "use_paint_mask", UI_ITEM_R_ICON_ONLY, "", ICON_NONE);
 			}
 			else {
diff --git a/source/blender/gpu/intern/gpu_buffers.c b/source/blender/gpu/intern/gpu_buffers.c
index 73c4d8a6804..e288c74fee6 100644
--- a/source/blender/gpu/intern/gpu_buffers.c
+++ b/source/blender/gpu/intern/gpu_buffers.c
@@ -82,7 +82,7 @@ static const GPUBufferTypeSettings gpu_buffer_type_settings[] = {
     /* normal */
     {GL_ARRAY_BUFFER, 4}, /* we copy 3 shorts per normal but we add a fourth for alignment */
     /* mcol */
-    {GL_ARRAY_BUFFER, 3},
+    {GL_ARRAY_BUFFER, 4},
     /* uv */
     {GL_ARRAY_BUFFER, 2},
     /* uv for texpaint */
@@ -690,7 +690,7 @@ void GPU_color_setup(DerivedMesh *dm, int colType)
 
 	glEnableClientState(GL_COLOR_ARRAY);
 	glBindBuffer(GL_ARRAY_BUFFER, dm->drawObject->colors->id);
-	glColorPointer(3, GL_UNSIGNED_BYTE, 0, 0);
+	glColorPointer(4, GL_UNSIGNED_BYTE, 0, 0);
 
 	GLStates |= GPU_BUFFER_COLOR_STATE;
 }
diff --git a/source/blender/makesdna/DNA_brush_types.h b/source/blender/makesdna/DNA_brush_types.h
index eecfd88606f..67a35d4e207 100644
--- a/source/blender/makesdna/DNA_brush_types.h
+++ b/source/blender/makesdna/DNA_brush_types.h
@@ -318,6 +318,18 @@ enum {
 	PAINT_BLEND_DARKEN = 6,
 	PAINT_BLEND_AVERAGE = 7,
 	PAINT_BLEND_SMEAR = 8,
+	PAINT_BLEND_COLORDODGE = 9,
+	PAINT_BLEND_DIFFERENCE = 10,
+	PAINT_BLEND_SCREEN = 11,
+	PAINT_BLEND_HARDLIGHT = 12,
+	PAINT_BLEND_OVERLAY = 13,
+	PAINT_BLEND_SOFTLIGHT = 14,
+	PAINT_BLEND_EXCLUSION = 15,
+	PAINT_BLEND_LUMINOCITY = 16,
+	PAINT_BLEND_SATURATION = 17,
+	PAINT_BLEND_HUE = 18,
+	PAINT_BLEND_ALPHA_SUB = 19,
+	PAINT_BLEND_ALPHA_ADD = 20,
 };
 
 typedef enum {
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");