Support GLSL es 3.00

src/gpu/gl/GrGLSL.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSL.h"
 #include "GrGLShaderVar.h"
 #include "SkString.h"
@@ skipping 11 matching lines @@
                 *generation = k150_GrGLSLGeneration;
             } else if (ver >= GR_GLSL_VER(1,40)) {
                 *generation = k140_GrGLSLGeneration;
             } else if (ver >= GR_GLSL_VER(1,30)) {
                 *generation = k130_GrGLSLGeneration;
             } else {
                 *generation = k110_GrGLSLGeneration;
             }
             return true;
         case kGLES_GrGLStandard:
             // version 1.00 of ES GLSL based on ver 1.20 of desktop GLSL

[bsalomon, 2014/10/16 01:41:35]

This comment should probably go

             SkASSERT(ver >= GR_GL_VER(1,00));
-            *generation = k110_GrGLSLGeneration;
+            if (ver >= GR_GLSL_VER(3,1)) {
+                *generation = k310_GrGLSLGeneration;
+            }
+            else if (ver >= GR_GLSL_VER(3,0)) {
+                *generation = k300_GrGLSLGeneration;
+            } else {
+                *generation = k110_GrGLSLGeneration;
+            }
             return true;
         default:
             SkFAIL("Unknown GL Standard");
             return false;
     }
 }
 
 const char* GrGetGLSLVersionDecl(const GrGLContextInfo& info) {
     switch (info.glslGeneration()) {
         case k110_GrGLSLGeneration:
@@ skipping 11 matching lines @@
         case k140_GrGLSLGeneration:
             SkASSERT(kGL_GrGLStandard == info.standard());
             return "#version 140\n";
         case k150_GrGLSLGeneration:
             SkASSERT(kGL_GrGLStandard == info.standard());
             if (info.caps()->isCoreProfile()) {
                 return "#version 150\n";
             } else {
                 return "#version 150 compatibility\n";
             }
+        case k300_GrGLSLGeneration:

[bsalomon, 2014/10/16 01:41:35]

I think we should make this work with desktop as well since most of us often
work on windows/linux/mac machines.

+            SkASSERT(kGLES_GrGLStandard == info.standard());
+            return "#version 300 es\n";
+        case k310_GrGLSLGeneration:
+            SkASSERT(kGLES_GrGLStandard == info.standard());
+            return "#version 310 es\n";
         default:
             SkFAIL("Unknown GL version.");
             return ""; // suppress warning
     }
 }
 
 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor) {
     if (mulFactor.isOnes()) {
         *outAppend = SkString();
     }
 
     if (mulFactor.isZeros()) {
         outAppend->appendf("%s = vec4(0);", vec4VarName);
     } else {
         outAppend->appendf("%s *= %s;", vec4VarName, mulFactor.c_str());
     }
 }