Mesa (master): swr: [rasterizer jitter] don' t bother quantizing unused channels

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: b53a33feef2595fc71fadafa5857d5482514a724
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b53a33feef2595fc71fadafa5857d5482514a724

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Sat Nov 12 13:17:27 2016 -0500

swr: [rasterizer jitter] don't bother quantizing unused channels

In a BGR10X2 or BGR5X1 situation, there's no need to try to quantize the
X channel - the default will have the proper quantization required.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Reviewed-by: Bruce Cherniak <bruce.cherniak at intel.com>

---

 src/gallium/drivers/swr/rasterizer/jitter/blend_jit.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/swr/rasterizer/jitter/blend_jit.cpp b/src/gallium/drivers/swr/rasterizer/jitter/blend_jit.cpp
index b5b21c0..ad809c4 100644
--- a/src/gallium/drivers/swr/rasterizer/jitter/blend_jit.cpp
+++ b/src/gallium/drivers/swr/rasterizer/jitter/blend_jit.cpp
@@ -220,7 +220,7 @@ struct BlendJit : public Builder
         const SWR_FORMAT_INFO& info = GetFormatInfo(format);
         for (uint32_t c = 0; c < info.numComps; ++c)
         {
-            if (info.bpc[c] <= QUANTIZE_THRESHOLD)
+            if (info.bpc[c] <= QUANTIZE_THRESHOLD && info.type[c] != SWR_TYPE_UNUSED)
             {
                 uint32_t swizComp = info.swizzle[c];
                 float factor = (float)((1 << info.bpc[c]) - 1);