From: Eric Anholt <eric@anholt.net>
Date: Tue, 21 Oct 2014 14:46:48 +0000 (+0100)
Subject: vc4: Fix SRC_ALPHA_SATURATE blending.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ef280c95f2623357452f5ca8e65367b7ac30699f;p=mesa.git

vc4: Fix SRC_ALPHA_SATURATE blending.

Fixes glean blendFunc.
---

diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index 7a2a9756a59..c6d9fb31603 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -1308,9 +1308,17 @@ vc4_blend_channel(struct vc4_compile *c,
         case PIPE_BLENDFACTOR_DST_COLOR:
                 return qir_FMUL(c, val, dst[channel]);
         case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
-                return qir_FMIN(c, src[3], qir_FSUB(c,
-                                                    qir_uniform_f(c, 1.0),
-                                                    dst[3]));
+                if (channel != 3) {
+                        return qir_FMUL(c,
+                                        val,
+                                        qir_FMIN(c,
+                                                 src[3],
+                                                 qir_FSUB(c,
+                                                          qir_uniform_f(c, 1.0),
+                                                          dst[3])));
+                } else {
+                        return val;
+                }
         case PIPE_BLENDFACTOR_CONST_COLOR:
                 return qir_FMUL(c, val,
                                 get_temp_for_uniform(c,