1 files changed, 137 insertions, 0 deletions
diff --git a/WebCore/html/canvas/WebGLBuffer.cpp b/WebCore/html/canvas/WebGLBuffer.cpp
new file mode 100644
index 0000000..cbad6a0
--- /dev/null
+++ b/WebCore/html/canvas/WebGLBuffer.cpp
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+/*
+ * 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));
+}
+
+PassRefPtr<WebGLBuffer> WebGLBuffer::create(WebGLRenderingContext* ctx, Platform3DObject obj)
+{
+    return adoptRef(new WebGLBuffer(ctx, obj));
+}
+
+WebGLBuffer::WebGLBuffer(WebGLRenderingContext* ctx)
+    : CanvasObject(ctx)
+    , m_elementArrayBufferByteLength(0)
+    , m_arrayBufferByteLength(0)
+    , m_elementArrayBufferCloned(false)
+{
+    setObject(context()->graphicsContext3D()->createBuffer());
+}
+
+WebGLBuffer::WebGLBuffer(WebGLRenderingContext* ctx, Platform3DObject obj)
+    : CanvasObject(ctx)
+{
+    setObject(obj, false);
+}
+
+void WebGLBuffer::_deleteObject(Platform3DObject object)
+{
+    context()->graphicsContext3D()->deleteBuffer(object);
+}
+
+bool WebGLBuffer::associateBufferData(unsigned long target, int size)
+{
+    if (target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        m_elementArrayBufferByteLength = size;
+        return true;
+    }
+    
+    if (target == GraphicsContext3D::ARRAY_BUFFER) {
+        m_arrayBufferByteLength = size;
+        return true;
+    }
+
+    return false;
+}
+
+bool WebGLBuffer::associateBufferData(unsigned long target, WebGLArray* array)
+{
+    if (!array)
+        return false;
+        
+    if (target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        m_elementArrayBufferByteLength = array->byteLength();
+        m_elementArrayBuffer = array->buffer();
+        m_elementArrayBufferCloned = false;
+        return true;
+    }
+    
+    if (target == GraphicsContext3D::ARRAY_BUFFER) {
+        m_arrayBufferByteLength = array->byteLength();
+        return true;
+    }
+    
+    return false;
+}
+
+bool WebGLBuffer::associateBufferSubData(unsigned long target, long offset, WebGLArray* array)
+{
+    if (!array)
+        return false;
+        
+    if (target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+        // 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_elementArrayBufferByteLength || array->byteLength() > m_elementArrayBufferByteLength - uoffset)
+            return false;
+            
+        // If we already have a buffer, we need to clone it and add the new data
+        if (m_elementArrayBuffer && !m_elementArrayBufferCloned) {
+            m_elementArrayBuffer = WebGLArrayBuffer::create(m_elementArrayBuffer.get());
+            m_elementArrayBufferCloned = true;
+        }
+            
+        memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()) + offset, array->baseAddress(), array->byteLength());
+        return true;
+    }
+    
+    if (target == GraphicsContext3D::ARRAY_BUFFER)
+        return array->byteLength() + offset <= m_arrayBufferByteLength;
+
+    return false;
+}
+
+unsigned WebGLBuffer::byteLength(unsigned long target) const
+{
+    return (target == GraphicsContext3D::ARRAY_BUFFER) ? m_arrayBufferByteLength : m_elementArrayBufferByteLength;
+}
+
+}
+
+#endif // ENABLE(3D_CANVAS)