Disable advance blend equations.

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 251 matching lines @@
         fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
         // supported on GL 1.4 and higher or by extension
         fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
                                   ctxInfo.hasExtension("GL_EXT_stencil_wrap");
     } else {
         // ES 2 has two sided stencil and stencil wrap
         fTwoSidedStencilSupport = true;
         fStencilWrapOpsSupport = true;
     }
 
+// Disabling advanced blend until we can resolve various bugs
+#if 0
     if (kIntel_GrGLVendor != ctxInfo.vendor()) {
         if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced_coherent") ||
             ctxInfo.hasExtension("GL_NV_blend_equation_advanced_coherent")) {
             fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
         } else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced") ||
                    ctxInfo.hasExtension("GL_NV_blend_equation_advanced")) {
             fBlendEquationSupport = kAdvanced_BlendEquationSupport;
         } else {
             fBlendEquationSupport = kBasic_BlendEquationSupport;
         }
     } else {
         // On Intel platforms, KHR_blend_equation_advanced is not conformant.
         fBlendEquationSupport = kBasic_BlendEquationSupport;
     }
-
+#endif
     if (kGL_GrGLStandard == standard) {
         fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
                                             // extension includes glMapBuffer.
         if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_map_buffer_range")) {
             fMapBufferFlags |= kSubset_MapFlag;
             fMapBufferType = kMapBufferRange_MapBufferType;
         } else {
             fMapBufferType = kMapBuffer_MapBufferType;
         }
     } else {
@@ skipping 850 matching lines @@
     if (fGeometryShaderSupport) {
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             fFloatPrecisions[kGeometry_GrShaderType][p] = fFloatPrecisions[kVertex_GrShaderType][p];
         }
     }
 }