fix for fix, own fix for [#31368] didnt work right, now move shadeless & wire paint drawing into draw_mesh_paint().

source/blender/editors/space_view3d/drawmesh.c

@@ -926,14 +926,14 @@ static int tex_mat_set_face_editmesh_cb(void *userData, int index)
 	return !BM_elem_flag_test(efa, BM_ELEM_HIDDEN);
 }
 
-void draw_mesh_textured(Scene *scene, View3D *v3d, RegionView3D *rv3d, Object *ob, DerivedMesh *dm, int draw_flags)
+void draw_mesh_textured(Scene *scene, View3D *v3d, RegionView3D *rv3d, Object *ob, DerivedMesh *dm, const int draw_flags)
 {
 	if ((!BKE_scene_use_new_shading_nodes(scene)) || (draw_flags & DRAW_MODIFIERS_PREVIEW)) {
 		draw_mesh_textured_old(scene, v3d, rv3d, ob, dm, draw_flags);
 		return;
 	}
 	else if (ob->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT)) {
-		draw_mesh_paint(rv3d, ob, dm, draw_flags);
+		draw_mesh_paint(v3d, rv3d, ob, dm, draw_flags);
 		return;
 	}
 
@@ -1002,16 +1002,19 @@ void draw_mesh_textured(Scene *scene, View3D *v3d, RegionView3D *rv3d, Object *o
 
 /* Vertex Paint and Weight Paint */
 
-void draw_mesh_paint(RegionView3D *rv3d, Object *ob, DerivedMesh *dm, int draw_flags)
+void draw_mesh_paint(View3D *v3d, RegionView3D *rv3d, Object *ob, DerivedMesh *dm, int draw_flags)
 {
 	DMSetDrawOptions facemask = NULL;
 	Mesh *me = ob->data;
+	const short do_light = (v3d->drawtype >= OB_SOLID);
 
 	/* hide faces in face select mode */
 	if (draw_flags & DRAW_FACE_SELECT)
 		facemask = wpaint__setSolidDrawOptions_facemask;
 
 	if (ob && ob->mode & OB_MODE_WEIGHT_PAINT) {
+
+		if (do_light) {
 			/* enforce default material settings */
 			GPU_enable_material(0, NULL);
 		
@@ -1025,15 +1028,18 @@ void draw_mesh_paint(RegionView3D *rv3d, Object *ob, DerivedMesh *dm, int draw_f
 			glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
 			glEnable(GL_LIGHTING);
 			glEnable(GL_COLOR_MATERIAL);
+		}
 
 		dm->drawMappedFaces(dm, facemask, GPU_enable_material, NULL, me,
 		                    DM_DRAW_USE_COLORS | DM_DRAW_ALWAYS_SMOOTH);
 
+		if (do_light) {
 			glDisable(GL_COLOR_MATERIAL);
 			glDisable(GL_LIGHTING);
 
 			GPU_disable_material();
 		}
+	}
 	else if (ob->mode & OB_MODE_VERTEX_PAINT) {
 		if (me->mloopcol) {
 			dm->drawMappedFaces(dm, facemask, GPU_enable_material, NULL, me,
@@ -1047,7 +1053,28 @@ void draw_mesh_paint(RegionView3D *rv3d, Object *ob, DerivedMesh *dm, int draw_f
 	}
 
 	/* draw face selection on top */
-	if (draw_flags & DRAW_FACE_SELECT)
+	if (draw_flags & DRAW_FACE_SELECT) {
 		draw_mesh_face_select(rv3d, me, dm);
+	}
+	else if ((do_light == FALSE) || (ob->dtx & OB_DRAWWIRE)) {
+
+		/* weight paint in solid mode, special case. focus on making the weights clear
+		 * rather than the shading, this is also forced in wire view */
+
+		bglPolygonOffset(rv3d->dist, 1.0);
+		glDepthMask(0); // disable write in zbuffer, selected edge wires show better
+
+		glEnable(GL_BLEND);
+		glColor4ub(255, 255, 255, 96);
+		glEnable(GL_LINE_STIPPLE);
+		glLineStipple(1, 0xAAAA);
+
+		dm->drawEdges(dm, 1, 1);
+
+		bglPolygonOffset(rv3d->dist, 0.0);
+		glDepthMask(1);
+		glDisable(GL_LINE_STIPPLE);
+		glDisable(GL_BLEND);
+	}
 }
 

source/blender/editors/space_view3d/drawobject.c

@@ -3367,34 +3367,7 @@ static void draw_mesh_fancy(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D
 		}
 	}
 	else if (dt == OB_SOLID) {
-		if (is_obact && ob->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT)) {
+		if (draw_flags & DRAW_MODIFIERS_PREVIEW) {
-			/* weight paint in solid mode, special case. focus on making the weights clear
-			 * rather than the shading, this is also forced in wire view */
-			GPU_enable_material(0, NULL);
-			dm->drawMappedFaces(dm, NULL, GPU_enable_material, NULL, me->mpoly,
-			                    DM_DRAW_USE_COLORS | DM_DRAW_ALWAYS_SMOOTH);
-
-			bglPolygonOffset(rv3d->dist, 1.0);
-			glDepthMask(0); // disable write in zbuffer, selected edge wires show better
-
-			glEnable(GL_BLEND);
-			glColor4ub(255, 255, 255, 96);
-			glEnable(GL_LINE_STIPPLE);
-			glLineStipple(1, 0xAAAA);
-
-			dm->drawEdges(dm, 1, 1);
-
-			bglPolygonOffset(rv3d->dist, 0.0);
-			glDepthMask(1);
-			glDisable(GL_LINE_STIPPLE);
-			glDisable(GL_BLEND);
-
-			GPU_disable_material();
-			
-			/* since we already draw wire as wp guide, don't draw over the top */
-			draw_wire = OBDRAW_WIRE_OFF;
-		}
-		else if (draw_flags & DRAW_MODIFIERS_PREVIEW) {
 			/* for object selection draws no shade */
 			if (flag & (DRAW_PICKING | DRAW_CONSTCOLOR)) {
 				dm->drawFacesSolid(dm, NULL, 0, GPU_enable_material);
@@ -3485,7 +3458,10 @@ static void draw_mesh_fancy(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D
 		}
 	}
 	else if (dt == OB_PAINT) {
-		draw_mesh_paint(rv3d, ob, dm, draw_flags);
+		draw_mesh_paint(v3d, rv3d, ob, dm, draw_flags);
+
+		/* since we already draw wire as wp guide, don't draw over the top */
+		draw_wire = OBDRAW_WIRE_OFF;
 	}
 	
 	/* set default draw color back for wire or for draw-extra later on */

source/blender/editors/space_view3d/view3d_intern.h

@@ -131,8 +131,10 @@ void view3d_cached_text_draw_end(View3D * v3d, ARegion * ar, int depth_write, fl
 int draw_armature(Scene *scene, View3D *v3d, ARegion *ar, Base *base, int dt, int flag, const short is_outline);
 
 /* drawmesh.c */
-void draw_mesh_textured(Scene *scene, View3D *v3d, RegionView3D *rv3d, struct Object *ob, struct DerivedMesh *dm, int faceselect);
+void draw_mesh_textured(Scene *scene, View3D *v3d, RegionView3D *rv3d,
-void draw_mesh_paint(RegionView3D *rv3d, struct Object *ob, struct DerivedMesh *dm, int faceselect);
+                        struct Object *ob, struct DerivedMesh *dm, const int draw_flags);
+void draw_mesh_paint(View3D *v3d, RegionView3D *rv3d,
+                     struct Object *ob, struct DerivedMesh *dm, const int draw_flags);
 
 /* view3d_draw.c */
 void view3d_main_area_draw(const struct bContext *C, struct ARegion *ar);