Implement OES_texture_float_linear and OES_texture_half_float_linear extensions in WebGL.

Source/core/html/canvas/WebGLTexture.h

 /*
  * 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 18 matching lines @@
 #include "core/html/canvas/WebGLSharedObject.h"
 
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
 #include <wtf/Vector.h>
 
 namespace WebCore {
 
 class WebGLTexture : public WebGLSharedObject {
 public:
+    enum TextureExtensionFlag {
+        NoTextureExtensionEnabled = 0,
+        TextureFloatLinearExtensionEnabled = 1,

[Ken Russell (switch to Gerrit), 2013/05/15 23:25:10]

It would be better to write these as 0, 1 << 0, and 1 << 1 to make it clear that
they're used as a bit field.

+        TextureHalfFloatLinearExtensionEnabled = 2
+    };
     virtual ~WebGLTexture();
 
     static PassRefPtr<WebGLTexture> create(WebGLRenderingContext*);
 
     void setTarget(GC3Denum target, GC3Dint maxLevel);
     void setParameteri(GC3Denum pname, GC3Dint param);
     void setParameterf(GC3Denum pname, GC3Dfloat param);
 
     GC3Denum getTarget() const { return m_target; }
 
     int getMinFilter() const { return m_minFilter; }
 
     void setLevelInfo(GC3Denum target, GC3Dint level, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height, GC3Denum type);
 
     bool canGenerateMipmaps();
     // Generate all level information.
     void generateMipmapLevelInfo();
 
     GC3Denum getInternalFormat(GC3Denum target, GC3Dint level) const;
     GC3Denum getType(GC3Denum target, GC3Dint level) const;
     GC3Dsizei getWidth(GC3Denum target, GC3Dint level) const;
     GC3Dsizei getHeight(GC3Denum target, GC3Dint level) const;
     bool isValid(GC3Denum target, GC3Dint level) const;
 
     // Whether width/height is NotPowerOfTwo.
     static bool isNPOT(GC3Dsizei, GC3Dsizei);
 
     bool isNPOT() const;
     // Determine if texture sampling should always return [0, 0, 0, 1] (OpenGL ES 2.0 Sec 3.8.2).
-    bool needToUseBlackTexture() const;
+    bool needToUseBlackTexture(TextureExtensionFlag) const;
 
     bool hasEverBeenBound() const { return object() && m_target; }
 
     static GC3Dint computeLevelCount(GC3Dsizei width, GC3Dsizei height);
 
 protected:
     WebGLTexture(WebGLRenderingContext*);
 
     virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
 
@@ skipping 38 matching lines @@
     GC3Denum m_minFilter;
     GC3Denum m_magFilter;
     GC3Denum m_wrapS;
     GC3Denum m_wrapT;
 
     Vector<Vector<LevelInfo> > m_info;
 
     bool m_isNPOT;
     bool m_isComplete;
     bool m_needToUseBlackTexture;
+    bool m_isFloatType;
+    bool m_isHalfFloatType;
 };
 
 } // namespace WebCore
 
 #endif // WebGLTexture_h