Add support for IMG's MSAA extension.

include/gpu/GrContext.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrContext_DEFINED
@@ skipping 95 matching lines @@
      * pressure.
      */
     void freeGpuResources();
 
     /**
      * Returns the number of bytes of GPU memory hosted by the texture cache.
      */
     size_t getGpuTextureCacheBytes() const;
 
     ///////////////////////////////////////////////////////////////////////////
-    // Textures
+    // Textures and Render Targets
 
     /**
      * Creates a new entry, based on the specified key and texture and returns it. The caller owns a
      * ref on the returned texture which must be balanced by a call to unref.
      *
      * @param params    The texture params used to draw a texture may help determine
      *                  the cache entry used. (e.g. different versions may exist
      *                  for different wrap modes on GPUs with limited NPOT
      *                  texture support). NULL implies clamp wrap modes.
      * @param desc      Description of the texture properties.
@@ skipping 117 matching lines @@
      *  @param maxTextureBytes The maximum number of bytes of texture memory
      *                         that can be held in the cache.
      */
     void setTextureCacheLimits(int maxTextures, size_t maxTextureBytes);
 
     /**
      *  Return the max width or height of a texture supported by the current GPU.
      */
     int getMaxTextureSize() const;
 
+    /**
+     * Returns the max sample count for a render target. It will be 0 if MSAA
+     * is not supported.
+     */
+    int getMaxSampleCount() const;
+
     ///////////////////////////////////////////////////////////////////////////
     // Render targets
 
     /**
      * Sets the render target.
      * @param target    the render target to set. (should not be NULL.)
      */
     void setRenderTarget(GrRenderTarget* target);
 
     /**
@@ skipping 738 matching lines @@
     }
 
     GrTexture* texture() { return fTexture; }
 
 private:
     GrContext*                    fContext;
     GrTexture*                    fTexture;
 };
 
 #endif