Use noperspective interpolation for 2D draws

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 576 matching lines @@
             glslCaps->fFBFetchNeedsCustomOutput = false;
             glslCaps->fFBFetchSupport = true;
             glslCaps->fFBFetchColorName = "gl_LastFragColorARM";
             glslCaps->fFBFetchExtensionString = "GL_ARM_shader_framebuffer_fetch";
         }
         glslCaps->fUsesPrecisionModifiers = true;
     }
 
     glslCaps->fBindlessTextureSupport = ctxInfo.hasExtension("GL_NV_bindless_texture");
 
+    if (kGL_GrGLStandard == standard) {
+        glslCaps->fFlatInterpolationSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
+    } else {
+        glslCaps->fFlatInterpolationSupport =
+            ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // This is the value for GLSL ES 3.0.
+    }
+
+    if (kGL_GrGLStandard == standard) {
+        glslCaps->fNoPerspectiveInterpolationSupport =
+            ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
+    } else {
+        if (ctxInfo.hasExtension("GL_NV_shader_noperspective_interpolation")) {
+            glslCaps->fNoPerspectiveInterpolationSupport = true;
+            glslCaps->fNoPerspectiveInterpolationExtensionString =
+                "GL_NV_shader_noperspective_interpolation";
+        }
+    }
+
     // Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
     glslCaps->fDropsTileOnZeroDivide = kQualcomm_GrGLVendor == ctxInfo.vendor();
 
     // On the NexusS and GalaxyNexus, the use of 'any' causes the compilation error "Calls to any
     // function that may require a gradient calculation inside a conditional block may return
     // undefined results". This appears to be an issue with the 'any' call since even the simple
     // "result=black; if (any()) result=white;" code fails to compile. This issue comes into play
     // from our GrTextureDomain processor.
     glslCaps->fCanUseAnyFunctionInShader = kImagination_GrGLVendor != ctxInfo.vendor();
 
@@ skipping 1057 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}