Disable SkImage multitexturing for AMD GPUs.

Change-Id: Icc68b09acfadf9e1f6e8ec582d2d6b7f1d00aebe
Reviewed-on: https://skia-review.googlesource.com/78403
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index d0436a43f2..e40b56ff2e 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -373,6 +373,11 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
                         std::numeric_limits<size_t>::max();
             }
             break;
+        case kATI_GrGLVendor:
+            // So far no AMD GPU shows a performance difference. A tie goes to disabling
+            // multitexturing for simplicity's sake.
+            fShaderCaps->fDisableImageMultitexturingDstRectAreaThreshold = 0;
+            break;
         default:
             break;
     }