1 files changed, 183 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.cpp b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.cpp
new file mode 100644
index 0000000000..423067e67e
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.cpp
@@ -0,0 +1,183 @@
+//
+// Copyright 2002 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/Context.h"
+#include "libANGLE/renderer/d3d/ContextD3D.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;
+    }
+}
+
+gl::DrawElementsType IndexBufferInterface::getIndexType() const
+{
+    return mIndexBuffer->getIndexType();
+}
+
+unsigned int IndexBufferInterface::getBufferSize() const
+{
+    return mIndexBuffer->getBufferSize();
+}
+
+unsigned int IndexBufferInterface::getSerial() const
+{
+    return mIndexBuffer->getSerial();
+}
+
+angle::Result IndexBufferInterface::mapBuffer(const gl::Context *context,
+                                              unsigned int size,
+                                              void **outMappedMemory,
+                                              unsigned int *streamOffset)
+{
+    // Protect against integer overflow
+    bool check = (mWritePosition + size < mWritePosition);
+    ANGLE_CHECK(GetImplAs<ContextD3D>(context), !check,
+                "Mapping of internal index buffer would cause an integer overflow.",
+                GL_OUT_OF_MEMORY);
+
+    angle::Result error = mIndexBuffer->mapBuffer(context, mWritePosition, size, outMappedMemory);
+    if (error == angle::Result::Stop)
+    {
+        if (outMappedMemory)
+        {
+            *outMappedMemory = nullptr;
+        }
+        return error;
+    }
+
+    if (streamOffset)
+    {
+        *streamOffset = mWritePosition;
+    }
+
+    mWritePosition += size;
+    return angle::Result::Continue;
+}
+
+angle::Result IndexBufferInterface::unmapBuffer(const gl::Context *context)
+{
+    return mIndexBuffer->unmapBuffer(context);
+}
+
+IndexBuffer *IndexBufferInterface::getIndexBuffer() const
+{
+    return mIndexBuffer;
+}
+
+unsigned int IndexBufferInterface::getWritePosition() const
+{
+    return mWritePosition;
+}
+
+void IndexBufferInterface::setWritePosition(unsigned int writePosition)
+{
+    mWritePosition = writePosition;
+}
+
+angle::Result IndexBufferInterface::discard(const gl::Context *context)
+{
+    return mIndexBuffer->discard(context);
+}
+
+angle::Result IndexBufferInterface::setBufferSize(const gl::Context *context,
+                                                  unsigned int bufferSize,
+                                                  gl::DrawElementsType indexType)
+{
+    if (mIndexBuffer->getBufferSize() == 0)
+    {
+        return mIndexBuffer->initialize(context, bufferSize, indexType, mDynamic);
+    }
+    else
+    {
+        return mIndexBuffer->setSize(context, bufferSize, indexType);
+    }
+}
+
+StreamingIndexBufferInterface::StreamingIndexBufferInterface(BufferFactoryD3D *factory)
+    : IndexBufferInterface(factory, true)
+{}
+
+StreamingIndexBufferInterface::~StreamingIndexBufferInterface() {}
+
+angle::Result StreamingIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
+                                                                unsigned int size,
+                                                                gl::DrawElementsType indexType)
+{
+    unsigned int curBufferSize = getBufferSize();
+    unsigned int writePos      = getWritePosition();
+    if (size > curBufferSize)
+    {
+        ANGLE_TRY(setBufferSize(context, std::max(size, 2 * curBufferSize), indexType));
+        setWritePosition(0);
+    }
+    else if (writePos + size > curBufferSize || writePos + size < writePos)
+    {
+        ANGLE_TRY(discard(context));
+        setWritePosition(0);
+    }
+
+    return angle::Result::Continue;
+}
+
+StaticIndexBufferInterface::StaticIndexBufferInterface(BufferFactoryD3D *factory)
+    : IndexBufferInterface(factory, false)
+{}
+
+StaticIndexBufferInterface::~StaticIndexBufferInterface() {}
+
+angle::Result StaticIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
+                                                             unsigned int size,
+                                                             gl::DrawElementsType indexType)
+{
+    unsigned int curSize = getBufferSize();
+    if (curSize == 0)
+    {
+        return setBufferSize(context, size, indexType);
+    }
+
+    ASSERT(curSize >= size && indexType == getIndexType());
+    return angle::Result::Continue;
+}
+
+}  // namespace rx