diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/canvas/WebGLBuffer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/WebGLBuffer.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,242 @@
+/*
+ * 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. 
+ */
+
+#include "config.h"
+
+#if ENABLE(3D_CANVAS)
+
+#include "WebGLBuffer.h"
+#include "WebGLRenderingContext.h"
+
+namespace WebCore {
+    
+PassRefPtr<WebGLBuffer> WebGLBuffer::create(WebGLRenderingContext* ctx)
+{
+    return adoptRef(new WebGLBuffer(ctx));
+}
+
+WebGLBuffer::WebGLBuffer(WebGLRenderingContext* ctx)
+    : CanvasObject(ctx)
+    , m_target(0)
+    , m_byteLength(0)
+    , m_nextAvailableCacheEntry(0)
+{
+    setObject(context()->graphicsContext3D()->createBuffer());
+    clearCachedMaxIndices();
+}
+
+void WebGLBuffer::_deleteObject(Platform3DObject object)
+{
+    context()->graphicsContext3D()->deleteBuffer(object);
+}
+
+bool WebGLBuffer::associateBufferData(int size)
+{
+    if (!m_target)
+        return false;
+
+    if (m_target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        m_byteLength = size;
+        clearCachedMaxIndices();
+        m_elementArrayBuffer = ArrayBuffer::create(size, 1);
+        if (!m_elementArrayBuffer) {
+            m_byteLength = 0;
+            return false;
+        }
+        return true;
+    } else if (m_target == GraphicsContext3D::ARRAY_BUFFER) {
+        m_byteLength = size;
+        return true;
+    }
+
+    return false;
+}
+
+bool WebGLBuffer::associateBufferData(ArrayBuffer* array)
+{
+    if (!m_target)
+        return false;
+    if (!array)
+        return false;
+
+    if (m_target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        clearCachedMaxIndices();
+        m_byteLength = array->byteLength();
+        // We must always clone the incoming data because client-side
+        // modifications without calling bufferData or bufferSubData
+        // must never be able to change the validation results.
+        m_elementArrayBuffer = ArrayBuffer::create(array);
+        if (!m_elementArrayBuffer) {
+            m_byteLength = 0;
+            return false;
+        }
+        return true;
+    }
+
+    if (m_target == GraphicsContext3D::ARRAY_BUFFER) {
+        m_byteLength = array->byteLength();
+        return true;
+    }
+
+    return false;
+}
+
+bool WebGLBuffer::associateBufferData(ArrayBufferView* array)
+{
+    if (!m_target)
+        return false;
+    if (!array)
+        return false;
+
+    if (m_target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        clearCachedMaxIndices();
+        m_byteLength = array->byteLength();
+        // We must always clone the incoming data because client-side
+        // modifications without calling bufferData or bufferSubData
+        // must never be able to change the validation results.
+        m_elementArrayBuffer = ArrayBuffer::create(array->buffer().get());
+        if (!m_elementArrayBuffer) {
+            m_byteLength = 0;
+            return false;
+        }
+        return true;
+    }
+
+    if (m_target == GraphicsContext3D::ARRAY_BUFFER) {
+        m_byteLength = array->byteLength();
+        return true;
+    }
+    
+    return false;
+}
+
+bool WebGLBuffer::associateBufferSubData(long offset, ArrayBuffer* array)
+{
+    if (!m_target)
+        return false;
+    if (!array)
+        return false;
+
+    if (m_target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        clearCachedMaxIndices();
+
+        // We need to protect against integer overflow with these tests
+        if (offset < 0)
+            return false;
+
+        unsigned long uoffset = static_cast<unsigned long>(offset);
+        if (uoffset > m_byteLength || array->byteLength() > m_byteLength - uoffset)
+            return false;
+
+        if (!m_elementArrayBuffer)
+            return false;
+
+        memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()) + offset,
+               static_cast<unsigned char*>(array->data()),
+               array->byteLength());
+        return true;
+    }
+
+    if (m_target == GraphicsContext3D::ARRAY_BUFFER)
+        return array->byteLength() + offset <= m_byteLength;
+
+    return false;
+}
+
+bool WebGLBuffer::associateBufferSubData(long offset, ArrayBufferView* array)
+{
+    if (!m_target)
+        return false;
+    if (!array)
+        return false;
+
+    if (m_target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        clearCachedMaxIndices();
+
+        // We need to protect against integer overflow with these tests
+        if (offset < 0)
+            return false;
+            
+        unsigned long uoffset = static_cast<unsigned long>(offset);
+        if (uoffset > m_byteLength || array->byteLength() > m_byteLength - uoffset)
+            return false;
+            
+        if (!m_elementArrayBuffer)
+            return false;
+
+        memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()) + offset, array->baseAddress(), array->byteLength());
+        return true;
+    }
+
+    if (m_target == GraphicsContext3D::ARRAY_BUFFER)
+        return array->byteLength() + offset <= m_byteLength;
+
+    return false;
+}
+
+unsigned WebGLBuffer::byteLength() const
+{
+    return m_byteLength;
+}
+
+long WebGLBuffer::getCachedMaxIndex(unsigned long type)
+{
+    size_t numEntries = sizeof(m_maxIndexCache) / sizeof(MaxIndexCacheEntry);
+    for (size_t i = 0; i < numEntries; i++)
+        if (m_maxIndexCache[i].type == type)
+            return m_maxIndexCache[i].maxIndex;
+    return -1;
+}
+
+void WebGLBuffer::setCachedMaxIndex(unsigned long type, long value)
+{
+    int numEntries = sizeof(m_maxIndexCache) / sizeof(MaxIndexCacheEntry);
+    for (int i = 0; i < numEntries; i++)
+        if (m_maxIndexCache[i].type == type) {
+            m_maxIndexCache[i].maxIndex = value;
+            return;
+        }
+    m_maxIndexCache[m_nextAvailableCacheEntry].type = type;
+    m_maxIndexCache[m_nextAvailableCacheEntry].maxIndex = value;
+    m_nextAvailableCacheEntry = (m_nextAvailableCacheEntry + 1) % numEntries;
+}
+
+void WebGLBuffer::setTarget(unsigned long target)
+{
+    // In WebGL, a buffer is bound to one target in its lifetime
+    if (m_target)
+        return;
+    if (target == GraphicsContext3D::ARRAY_BUFFER || target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER)
+        m_target = target;
+}
+
+void WebGLBuffer::clearCachedMaxIndices()
+{
+    memset(m_maxIndexCache, 0, sizeof(m_maxIndexCache));
+}
+
+}
+
+#endif // ENABLE(3D_CANVAS)