1 files changed, 160 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/IndexBuffer11.cpp b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/IndexBuffer11.cpp
new file mode 100644
index 0000000000..7630b341fa
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/IndexBuffer11.cpp
@@ -0,0 +1,160 @@
+//
+// Copyright 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.
+//
+
+// IndexBuffer11.cpp: Defines the D3D11 IndexBuffer implementation.
+
+#include "libANGLE/renderer/d3d/d3d11/IndexBuffer11.h"
+
+#include "libANGLE/Context.h"
+#include "libANGLE/renderer/d3d/d3d11/Context11.h"
+#include "libANGLE/renderer/d3d/d3d11/Renderer11.h"
+#include "libANGLE/renderer/d3d/d3d11/renderer11_utils.h"
+
+namespace rx
+{
+
+IndexBuffer11::IndexBuffer11(Renderer11 *const renderer)
+    : mRenderer(renderer),
+      mBuffer(),
+      mBufferSize(0),
+      mIndexType(gl::DrawElementsType::InvalidEnum),
+      mDynamicUsage(false)
+{}
+
+IndexBuffer11::~IndexBuffer11() {}
+
+angle::Result IndexBuffer11::initialize(const gl::Context *context,
+                                        unsigned int bufferSize,
+                                        gl::DrawElementsType indexType,
+                                        bool dynamic)
+{
+    mBuffer.reset();
+
+    updateSerial();
+
+    if (bufferSize > 0)
+    {
+        D3D11_BUFFER_DESC bufferDesc;
+        bufferDesc.ByteWidth           = bufferSize;
+        bufferDesc.Usage               = D3D11_USAGE_DYNAMIC;
+        bufferDesc.BindFlags           = D3D11_BIND_INDEX_BUFFER;
+        bufferDesc.CPUAccessFlags      = D3D11_CPU_ACCESS_WRITE;
+        bufferDesc.MiscFlags           = 0;
+        bufferDesc.StructureByteStride = 0;
+
+        ANGLE_TRY(mRenderer->allocateResource(GetImplAs<Context11>(context), bufferDesc, &mBuffer));
+
+        if (dynamic)
+        {
+            mBuffer.setInternalName("IndexBuffer11(dynamic)");
+        }
+        else
+        {
+            mBuffer.setInternalName("IndexBuffer11(static)");
+        }
+    }
+
+    mBufferSize   = bufferSize;
+    mIndexType    = indexType;
+    mDynamicUsage = dynamic;
+
+    return angle::Result::Continue;
+}
+
+angle::Result IndexBuffer11::mapBuffer(const gl::Context *context,
+                                       unsigned int offset,
+                                       unsigned int size,
+                                       void **outMappedMemory)
+{
+    Context11 *context11 = GetImplAs<Context11>(context);
+    ANGLE_CHECK_HR(context11, mBuffer.valid(), "Internal index buffer is not initialized.",
+                   E_OUTOFMEMORY);
+
+    // Check for integer overflows and out-out-bounds map requests
+    bool outOfBounds = (offset + size < offset || offset + size > mBufferSize);
+    ANGLE_CHECK_HR(context11, !outOfBounds, "Index buffer map range is not inside the buffer.",
+                   E_OUTOFMEMORY);
+
+    D3D11_MAPPED_SUBRESOURCE mappedResource;
+    ANGLE_TRY(mRenderer->mapResource(context, mBuffer.get(), 0, D3D11_MAP_WRITE_NO_OVERWRITE, 0,
+                                     &mappedResource));
+
+    *outMappedMemory = static_cast<char *>(mappedResource.pData) + offset;
+    return angle::Result::Continue;
+}
+
+angle::Result IndexBuffer11::unmapBuffer(const gl::Context *context)
+{
+    Context11 *context11 = GetImplAs<Context11>(context);
+    ANGLE_CHECK_HR(context11, mBuffer.valid(), "Internal index buffer is not initialized.",
+                   E_OUTOFMEMORY);
+
+    ID3D11DeviceContext *dxContext = mRenderer->getDeviceContext();
+    dxContext->Unmap(mBuffer.get(), 0);
+    return angle::Result::Continue;
+}
+
+gl::DrawElementsType IndexBuffer11::getIndexType() const
+{
+    return mIndexType;
+}
+
+unsigned int IndexBuffer11::getBufferSize() const
+{
+    return mBufferSize;
+}
+
+angle::Result IndexBuffer11::setSize(const gl::Context *context,
+                                     unsigned int bufferSize,
+                                     gl::DrawElementsType indexType)
+{
+    if (bufferSize > mBufferSize || indexType != mIndexType)
+    {
+        return initialize(context, bufferSize, indexType, mDynamicUsage);
+    }
+
+    return angle::Result::Continue;
+}
+
+angle::Result IndexBuffer11::discard(const gl::Context *context)
+{
+    Context11 *context11 = GetImplAs<Context11>(context);
+    ANGLE_CHECK_HR(context11, mBuffer.valid(), "Internal index buffer is not initialized.",
+                   E_OUTOFMEMORY);
+
+    ID3D11DeviceContext *dxContext = mRenderer->getDeviceContext();
+
+    D3D11_MAPPED_SUBRESOURCE mappedResource;
+    ANGLE_TRY(mRenderer->mapResource(context, mBuffer.get(), 0, D3D11_MAP_WRITE_DISCARD, 0,
+                                     &mappedResource));
+
+    dxContext->Unmap(mBuffer.get(), 0);
+
+    return angle::Result::Continue;
+}
+
+DXGI_FORMAT IndexBuffer11::getIndexFormat() const
+{
+    switch (mIndexType)
+    {
+        case gl::DrawElementsType::UnsignedByte:
+            return DXGI_FORMAT_R16_UINT;
+        case gl::DrawElementsType::UnsignedShort:
+            return DXGI_FORMAT_R16_UINT;
+        case gl::DrawElementsType::UnsignedInt:
+            return DXGI_FORMAT_R32_UINT;
+        default:
+            UNREACHABLE();
+            return DXGI_FORMAT_UNKNOWN;
+    }
+}
+
+const d3d11::Buffer &IndexBuffer11::getBuffer() const
+{
+    return mBuffer;
+}
+
+}  // namespace rx