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//
// 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