diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/canvas/WebGLBuffer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/WebGLBuffer.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,97 @@
+/*
+ * 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef WebGLBuffer_h
+#define WebGLBuffer_h
+
+#include "CanvasObject.h"
+#include "ArrayBuffer.h"
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+    
+    class WebGLBuffer : public CanvasObject {
+    public:
+        virtual ~WebGLBuffer() { deleteObject(); }
+        
+        static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*);
+
+        bool associateBufferData(int size);
+        bool associateBufferData(ArrayBuffer* array);
+        bool associateBufferData(ArrayBufferView* array);
+        bool associateBufferSubData(long offset, ArrayBuffer* array);
+        bool associateBufferSubData(long offset, ArrayBufferView* array);
+        
+        unsigned byteLength() const;
+        const ArrayBuffer* elementArrayBuffer() const { return m_elementArrayBuffer.get(); }
+                        
+        // Gets the cached max index for the given type. Returns -1 if
+        // none has been set.
+        long getCachedMaxIndex(unsigned long type);
+        // Sets the cached max index for the given type.
+        void setCachedMaxIndex(unsigned long type, long value);
+
+        unsigned long getTarget() const { return m_target; }
+        void setTarget(unsigned long);
+
+    protected:
+        WebGLBuffer(WebGLRenderingContext*);
+
+        virtual void _deleteObject(Platform3DObject o);
+    
+    private:
+        virtual bool isBuffer() const { return true; }
+
+        unsigned long m_target;
+
+        RefPtr<ArrayBuffer> m_elementArrayBuffer;
+        unsigned m_byteLength;
+
+        // Optimization for index validation. For each type of index
+        // (i.e., UNSIGNED_SHORT), cache the maximum index in the
+        // entire buffer.
+        // 
+        // This is sufficient to eliminate a lot of work upon each
+        // draw call as long as all bound array buffers are at least
+        // that size.
+        struct MaxIndexCacheEntry {
+            unsigned long type;
+            long maxIndex;
+        };
+        // OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE
+        // and UNSIGNED_SHORT), but might as well leave open the
+        // possibility of adding others.
+        MaxIndexCacheEntry m_maxIndexCache[4];
+        unsigned m_nextAvailableCacheEntry;
+
+        // Clears all of the cached max indices.
+        void clearCachedMaxIndices();
+    };
+    
+} // namespace WebCore
+
+#endif // WebGLBuffer_h