Improve GLSL integer support

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 261 matching lines @@
 
     // Enable supported shader-related caps
     if (kGL_GrGLStandard == standard) {
         glslCaps->fDualSourceBlendingSupport = (ctxInfo.version() >= GR_GL_VER(3, 3) ||
             ctxInfo.hasExtension("GL_ARB_blend_func_extended")) &&
             GrGLSLSupportsNamedFragmentShaderOutputs(ctxInfo.glslGeneration());
         glslCaps->fShaderDerivativeSupport = true;
         // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
         glslCaps->fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3, 2) &&
             ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
+        glslCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
+            ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
     }
     else {
         glslCaps->fDualSourceBlendingSupport = ctxInfo.hasExtension("GL_EXT_blend_func_extended");
 
         glslCaps->fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
             ctxInfo.hasExtension("GL_OES_standard_derivatives");
+
+        glslCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
+            ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
     }
 
     if (ctxInfo.hasExtension("GL_EXT_shader_pixel_local_storage")) {
         #define GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT 0x8F63
         GR_GL_GetIntegerv(gli, GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT, 
                           &glslCaps->fPixelLocalStorageSize);
         glslCaps->fPLSPathRenderingSupport = glslCaps->fFBFetchSupport;
     }
     else {
         glslCaps->fPixelLocalStorageSize = 0;
@@ skipping 1361 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) {}