Use GL_chromium_color_buffer_float extensions

Source/core/html/canvas/OESTextureFloat.cpp

 /*
  * Copyright (C) 2010 Google 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
@@ skipping 15 matching lines @@
 #include "config.h"
 
 #include "core/html/canvas/OESTextureFloat.h"
 
 namespace WebCore {
 
 OESTextureFloat::OESTextureFloat(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
-    context->graphicsContext3D()->ensureExtensionEnabled("GL_OES_texture_float");
+    if (context->graphicsContext3D()->ensureExtensionEnabled("GL_OES_texture_float")) {
+        // Implicitly enable rendering to float textures
+        context->graphicsContext3D()->ensureExtensionEnabled("GL_CHROMIUM_color_buffer_float_rgba");
+        context->graphicsContext3D()->ensureExtensionEnabled("GL_CHROMIUM_color_buffer_float_rgb");
+    }
 }
 
 OESTextureFloat::~OESTextureFloat()
 {
 }
 
 WebGLExtension::ExtensionName OESTextureFloat::name() const
 {
     return OESTextureFloatName;
 }
 
 PassRefPtr<OESTextureFloat> OESTextureFloat::create(WebGLRenderingContext* context)
 {
     return adoptRef(new OESTextureFloat(context));
 }
 
 bool OESTextureFloat::supported(WebGLRenderingContext* context)
 {
     return context->graphicsContext3D()->supportsExtension("GL_OES_texture_float");
 }
 
 const char* OESTextureFloat::extensionName()
 {
     return "OES_texture_float";
 }
 
 } // namespace WebCore