Added Blink-side support for EXT_blend_minmax WebGL extension

Source/core/html/canvas/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/ANGLEInstancedArrays.h"
+#include "core/html/canvas/EXTBlendMinMax.h"
 #include "core/html/canvas/EXTFragDepth.h"
 #include "core/html/canvas/EXTShaderTextureLOD.h"
 #include "core/html/canvas/EXTTextureFilterAnisotropic.h"
 #include "core/html/canvas/OESElementIndexUint.h"
 #include "core/html/canvas/OESStandardDerivatives.h"
 #include "core/html/canvas/OESTextureFloat.h"
 #include "core/html/canvas/OESTextureFloatLinear.h"
 #include "core/html/canvas/OESTextureHalfFloat.h"
 #include "core/html/canvas/OESTextureHalfFloatLinear.h"
 #include "core/html/canvas/OESVertexArrayObject.h"
@@ skipping 5032 matching lines @@
     return true;
 }
 
 bool WebGLRenderingContextBase::validateBlendEquation(const char* functionName, GLenum mode)
 {
     switch (mode) {
     case GL_FUNC_ADD:
     case GL_FUNC_SUBTRACT:
     case GL_FUNC_REVERSE_SUBTRACT:
         return true;
+    case GL_MIN_EXT:
+    case GL_MAX_EXT:
+        if (extensionEnabled(EXTBlendMinMaxName))
+            return true;
+        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid mode");
+        return false;
     default:
         synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid mode");
         return false;
     }
 }
 
 bool WebGLRenderingContextBase::validateBlendFuncFactors(const char* functionName, GLenum src, GLenum dst)
 {
     if (((src == GL_CONSTANT_COLOR || src == GL_ONE_MINUS_CONSTANT_COLOR)
         && (dst == GL_CONSTANT_ALPHA || dst == GL_ONE_MINUS_CONSTANT_ALPHA))
@@ skipping 582 matching lines @@
         if (m_textureUnits[i].m_texture2DBinding
             || m_textureUnits[i].m_textureCubeMapBinding) {
             m_onePlusMaxNonDefaultTextureUnit = i + 1;
             return;
         }
     }
     m_onePlusMaxNonDefaultTextureUnit = 0;
 }
 
 } // namespace WebCore