commit 240af98c655a92c11bbf4541c94a4c0f62283bef
author Michael Ludwig <michaelludwig@google.com> Mon Dec 03 16:16:18 2018 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Tue Dec 04 13:31:44 2018 +0000
tree a4f4124894485a1d6dbe333f7f88279382cbe25a
parent 1a9956e76b232236a41203b4a2cdf352ba2bad75

Avoid flat interpolation on ANGLE

Bug: skia:
Change-Id: I12bea94bee9d90b92ed640c5b69853cb47d7f2e8
Reviewed-on: https://skia-review.googlesource.com/c/174066
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>

src/gpu/gl/GrGLCaps.cpp

diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 1f2d8f3..73e1f9d 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -735,9 +735,11 @@
         shaderCaps->fFlatInterpolationSupport =
             ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // This is the value for GLSL ES 3.0.
     }
-    // Flat interpolation appears to be slow on Qualcomm GPUs (tested Adreno 405 and 530).
+    // Flat interpolation appears to be slow on Qualcomm GPUs (tested Adreno 405 and 530). ANGLE
+    // Avoid on ANGLE too, it inserts a geometry shader into the pipeline to implement flat interp.
     shaderCaps->fPreferFlatInterpolation = shaderCaps->fFlatInterpolationSupport &&
-                                           kQualcomm_GrGLVendor != ctxInfo.vendor();
+                                           kQualcomm_GrGLVendor != ctxInfo.vendor() &&
+                                           kANGLE_GrGLDriver != ctxInfo.driver();
     if (kGL_GrGLStandard == standard) {
         shaderCaps->fNoPerspectiveInterpolationSupport =
             ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;