1 files changed, 196 insertions, 0 deletions
diff --git a/gfx/angle/src/libANGLE/renderer/d3d/IndexBuffer.cpp b/gfx/angle/src/libANGLE/renderer/d3d/IndexBuffer.cpp
new file mode 100755
index 000000000..677b8bb24
--- /dev/null
+++ b/gfx/angle/src/libANGLE/renderer/d3d/IndexBuffer.cpp
@@ -0,0 +1,196 @@
+//
+// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// IndexBuffer.cpp: Defines the abstract IndexBuffer class and IndexBufferInterface
+// class with derivations, classes that perform graphics API agnostic index buffer operations.
+
+#include "libANGLE/renderer/d3d/IndexBuffer.h"
+#include "libANGLE/renderer/d3d/RendererD3D.h"
+
+namespace rx
+{
+
+unsigned int IndexBuffer::mNextSerial = 1;
+
+IndexBuffer::IndexBuffer()
+{
+    updateSerial();
+}
+
+IndexBuffer::~IndexBuffer()
+{
+}
+
+unsigned int IndexBuffer::getSerial() const
+{
+    return mSerial;
+}
+
+void IndexBuffer::updateSerial()
+{
+    mSerial = mNextSerial++;
+}
+
+
+IndexBufferInterface::IndexBufferInterface(BufferFactoryD3D *factory, bool dynamic)
+{
+    mIndexBuffer = factory->createIndexBuffer();
+
+    mDynamic = dynamic;
+    mWritePosition = 0;
+}
+
+IndexBufferInterface::~IndexBufferInterface()
+{
+    if (mIndexBuffer)
+    {
+        delete mIndexBuffer;
+    }
+}
+
+GLenum IndexBufferInterface::getIndexType() const
+{
+    return mIndexBuffer->getIndexType();
+}
+
+unsigned int IndexBufferInterface::getBufferSize() const
+{
+    return mIndexBuffer->getBufferSize();
+}
+
+unsigned int IndexBufferInterface::getSerial() const
+{
+    return mIndexBuffer->getSerial();
+}
+
+gl::Error IndexBufferInterface::mapBuffer(unsigned int size, void **outMappedMemory, unsigned int *streamOffset)
+{
+    // Protect against integer overflow
+    if (mWritePosition + size < mWritePosition)
+    {
+        return gl::Error(GL_OUT_OF_MEMORY, "Mapping of internal index buffer would cause an integer overflow.");
+    }
+
+    gl::Error error = mIndexBuffer->mapBuffer(mWritePosition, size, outMappedMemory);
+    if (error.isError())
+    {
+        if (outMappedMemory)
+        {
+            *outMappedMemory = NULL;
+        }
+        return error;
+    }
+
+    if (streamOffset)
+    {
+        *streamOffset = mWritePosition;
+    }
+
+    mWritePosition += size;
+    return gl::Error(GL_NO_ERROR);
+}
+
+gl::Error IndexBufferInterface::unmapBuffer()
+{
+    return mIndexBuffer->unmapBuffer();
+}
+
+IndexBuffer * IndexBufferInterface::getIndexBuffer() const
+{
+    return mIndexBuffer;
+}
+
+unsigned int IndexBufferInterface::getWritePosition() const
+{
+    return mWritePosition;
+}
+
+void IndexBufferInterface::setWritePosition(unsigned int writePosition)
+{
+    mWritePosition = writePosition;
+}
+
+gl::Error IndexBufferInterface::discard()
+{
+    return mIndexBuffer->discard();
+}
+
+gl::Error IndexBufferInterface::setBufferSize(unsigned int bufferSize, GLenum indexType)
+{
+    if (mIndexBuffer->getBufferSize() == 0)
+    {
+        return mIndexBuffer->initialize(bufferSize, indexType, mDynamic);
+    }
+    else
+    {
+        return mIndexBuffer->setSize(bufferSize, indexType);
+    }
+}
+
+StreamingIndexBufferInterface::StreamingIndexBufferInterface(BufferFactoryD3D *factory)
+    : IndexBufferInterface(factory, true)
+{
+}
+
+StreamingIndexBufferInterface::~StreamingIndexBufferInterface()
+{
+}
+
+gl::Error StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
+{
+    unsigned int curBufferSize = getBufferSize();
+    unsigned int writePos = getWritePosition();
+    if (size > curBufferSize)
+    {
+        gl::Error error = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
+        if (error.isError())
+        {
+            return error;
+        }
+        setWritePosition(0);
+    }
+    else if (writePos + size > curBufferSize || writePos + size < writePos)
+    {
+        gl::Error error = discard();
+        if (error.isError())
+        {
+            return error;
+        }
+        setWritePosition(0);
+    }
+
+    return gl::Error(GL_NO_ERROR);
+}
+
+
+StaticIndexBufferInterface::StaticIndexBufferInterface(BufferFactoryD3D *factory)
+    : IndexBufferInterface(factory, false)
+{
+}
+
+StaticIndexBufferInterface::~StaticIndexBufferInterface()
+{
+}
+
+gl::Error StaticIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
+{
+    unsigned int curSize = getBufferSize();
+    if (curSize == 0)
+    {
+        return setBufferSize(size, indexType);
+    }
+    else if (curSize >= size && indexType == getIndexType())
+    {
+        return gl::Error(GL_NO_ERROR);
+    }
+    else
+    {
+        UNREACHABLE();
+        return gl::Error(GL_INVALID_OPERATION, "Internal static index buffers can't be resized");
+    }
+}
+
+}