1 files changed, 28 insertions, 9 deletions

diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c
index 888426735c5..2f666bf5922 100644
--- a/source/blender/blenkernel/intern/brush.c
+++ b/source/blender/blenkernel/intern/brush.c
@@ -525,21 +525,16 @@ float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
 		float radius = 1.0f; /* Quite warnings */
 		float co[3];
 
-		if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW ||
-		    mtex->brush_map_mode == MTEX_MAP_MODE_RANDOM)
-		{
+		if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW) {
 			/* keep coordinates relative to mouse */
 
 			rotation += ups->brush_rotation;
 
-			point_2d[0] -= ups->tex_mouse[0];
-			point_2d[1] -= ups->tex_mouse[1];
+			x = point_2d[0] - ups->tex_mouse[0];
+			y = point_2d[1] - ups->tex_mouse[1];
 
 			/* use pressure adjusted size for fixed mode */
 			radius = ups->pixel_radius;
-
-			x = point_2d[0];
-			y = point_2d[1];
 		}
 		else if (mtex->brush_map_mode == MTEX_MAP_MODE_TILED) {
 			/* leave the coordinates relative to the screen */
@@ -550,6 +545,14 @@ float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
 			x = point_2d[0];
 			y = point_2d[1];
 		}
+		else if (mtex->brush_map_mode == MTEX_MAP_MODE_RANDOM) {
+			rotation += ups->brush_rotation;
+			/* these contain a random coordinate */
+			x = point_2d[0] - ups->tex_mouse[0];
+			y = point_2d[1] - ups->tex_mouse[1];
+
+			radius = ups->pixel_radius;
+		}
 
 		x /= radius;
 		y /= radius;
@@ -661,6 +664,14 @@ float BKE_brush_sample_tex_2D(const Scene *scene, Brush *brush, const float xy[2
 			rotation += ups->brush_rotation;
 			radius = ups->pixel_radius;
 		}
+		else if (mtex->brush_map_mode == MTEX_MAP_MODE_RANDOM) {
+			rotation += ups->brush_rotation;
+			/* these contain a random coordinate */
+			x -= ups->tex_mouse[0];
+			y -= ups->tex_mouse[1];
+
+			radius = ups->pixel_radius;
+		}
 
 		x /= radius;
 		y /= radius;
@@ -981,6 +992,14 @@ void BKE_brush_jitter_pos(const Scene *scene, Brush *brush, const float pos[2],
 	}
 }
 
+void BKE_brush_randomize_texture_coordinates(UnifiedPaintSettings *ups)
+{
+	/* we multiply with brush radius as an optimization for the brush
+	 * texture sampling functions */
+	ups->tex_mouse[0] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
+	ups->tex_mouse[1] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
+}
+
 /* Uses the brush curve control to find a strength value between 0 and 1 */
 float BKE_brush_curve_strength_clamp(Brush *br, float p, const float len)
 {
@@ -1021,7 +1040,7 @@ unsigned int *BKE_brush_gen_texture_cache(Brush *br, int half_side)
 
 		texcache = MEM_callocN(sizeof(int) * side * side, "Brush texture cache");
 
-		/*do normalized cannonical view coords for texture*/
+		/* do normalized cannonical view coords for texture */
 		for (y = -1.0, iy = 0; iy < side; iy++, y += step) {
 			for (x = -1.0, ix = 0; ix < side; ix++, x += step) {
 				co[0] = x;