softpipe: Fix rgb_dst_factor == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE.

We must multiply the factor against the destination, not the source.

NOTE: Candidate for the stable branches.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

diff --git a/src/gallium/drivers/softpipe/sp_quad_blend.c b/src/gallium/drivers/softpipe/sp_quad_blend.c
index aba6730da050b3bcdd3771fcccfa96bbafe7de83..b85431d5be9ff8250e0fd3c8b4f78e2738ba4355 100644 (file)
--- a/src/gallium/drivers/softpipe/sp_quad_blend.c
+++ b/src/gallium/drivers/softpipe/sp_quad_blend.c
@@ -568,9 +568,9 @@ blend_quad(struct quad_stage *qs,
          float diff[4], temp[4];
          VEC4_SUB(diff, one, blend_dest[3]);
          VEC4_MIN(temp, alpha, diff);
-         VEC4_MUL(blend_dest[0], quadColor[0], temp); /* R */
-         VEC4_MUL(blend_dest[1], quadColor[1], temp); /* G */
-         VEC4_MUL(blend_dest[2], quadColor[2], temp); /* B */
+         VEC4_MUL(blend_dest[0], blend_dest[0], temp); /* R */
+         VEC4_MUL(blend_dest[1], blend_dest[1], temp); /* G */
+         VEC4_MUL(blend_dest[2], blend_dest[2], temp); /* B */
       }
       break;
    case PIPE_BLENDFACTOR_CONST_COLOR: