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//
// Copyright 2014 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.
//
// BufferD3D.cpp Defines common functionality between the Buffer9 and Buffer11 classes.
#include "libANGLE/renderer/d3d/BufferD3D.h"
#include "common/mathutil.h"
#include "common/utilities.h"
#include "libANGLE/renderer/d3d/IndexBuffer.h"
#include "libANGLE/renderer/d3d/VertexBuffer.h"
#include "libANGLE/renderer/d3d/RendererD3D.h"
namespace rx
{
unsigned int BufferD3D::mNextSerial = 1;
BufferD3D::BufferD3D(BufferFactoryD3D *factory)
: BufferImpl(),
mFactory(factory),
mStaticIndexBuffer(nullptr),
mStaticBufferCacheTotalSize(0),
mStaticVertexBufferOutOfDate(false),
mUnmodifiedDataUse(0),
mUsage(D3DBufferUsage::STATIC)
{
updateSerial();
}
BufferD3D::~BufferD3D()
{
SafeDelete(mStaticIndexBuffer);
}
void BufferD3D::emptyStaticBufferCache()
{
mStaticVertexBuffers.clear();
mStaticBufferCacheTotalSize = 0;
}
void BufferD3D::updateSerial()
{
mSerial = mNextSerial++;
}
void BufferD3D::updateD3DBufferUsage(GLenum usage)
{
switch (usage)
{
case GL_STATIC_DRAW:
case GL_STATIC_READ:
case GL_STATIC_COPY:
mUsage = D3DBufferUsage::STATIC;
initializeStaticData();
break;
case GL_STREAM_DRAW:
case GL_STREAM_READ:
case GL_STREAM_COPY:
case GL_DYNAMIC_READ:
case GL_DYNAMIC_COPY:
case GL_DYNAMIC_DRAW:
mUsage = D3DBufferUsage::DYNAMIC;
break;
default:
UNREACHABLE();
}
}
void BufferD3D::initializeStaticData()
{
if (mStaticVertexBuffers.empty())
{
auto newStaticBuffer = new StaticVertexBufferInterface(mFactory);
mStaticVertexBuffers.push_back(
std::unique_ptr<StaticVertexBufferInterface>(newStaticBuffer));
}
if (!mStaticIndexBuffer)
{
mStaticIndexBuffer = new StaticIndexBufferInterface(mFactory);
}
}
StaticIndexBufferInterface *BufferD3D::getStaticIndexBuffer()
{
return mStaticIndexBuffer;
}
StaticVertexBufferInterface *BufferD3D::getStaticVertexBuffer(const gl::VertexAttribute &attribute)
{
if (mStaticVertexBuffers.empty())
{
// Early out if there aren't any static buffers at all
return nullptr;
}
// Early out, the attribute can be added to mStaticVertexBuffer.
if (mStaticVertexBuffers.size() == 1 && mStaticVertexBuffers[0]->empty())
{
return mStaticVertexBuffers[0].get();
}
// Cache size limiting: track the total allocated buffer sizes.
size_t currentTotalSize = 0;
// At this point, see if any of the existing static buffers contains the attribute data
// If there is a cached static buffer that already contains the attribute, then return it
for (const auto &staticBuffer : mStaticVertexBuffers)
{
if (staticBuffer->matchesAttribute(attribute))
{
return staticBuffer.get();
}
currentTotalSize += staticBuffer->getBufferSize();
}
// Cache size limiting: Clean-up threshold is four times the base buffer size, with a minimum.
ASSERT(getSize() < std::numeric_limits<size_t>::max() / 4u);
size_t sizeThreshold = std::max(getSize() * 4u, static_cast<size_t>(0x1000u));
// If we're past the threshold, clear the buffer cache. Note that this will release buffers
// that are currenly bound, and in an edge case can even translate the same attribute twice
// in the same draw call. It will not delete currently bound buffers, however, because they
// are ref counted.
if (currentTotalSize > sizeThreshold)
{
emptyStaticBufferCache();
}
// At this point, we must create a new static buffer for the attribute data.
auto newStaticBuffer = new StaticVertexBufferInterface(mFactory);
newStaticBuffer->setAttribute(attribute);
mStaticVertexBuffers.push_back(std::unique_ptr<StaticVertexBufferInterface>(newStaticBuffer));
return newStaticBuffer;
}
void BufferD3D::invalidateStaticData()
{
emptyStaticBufferCache();
if (mStaticIndexBuffer && mStaticIndexBuffer->getBufferSize() != 0)
{
SafeDelete(mStaticIndexBuffer);
}
// If the buffer was created with a static usage then we recreate the static
// buffers so that they are populated the next time we use this buffer.
if (mUsage == D3DBufferUsage::STATIC)
{
initializeStaticData();
}
mUnmodifiedDataUse = 0;
}
// Creates static buffers if sufficient used data has been left unmodified
void BufferD3D::promoteStaticUsage(int dataSize)
{
if (mUsage == D3DBufferUsage::DYNAMIC)
{
mUnmodifiedDataUse += dataSize;
if (mUnmodifiedDataUse > 3 * getSize())
{
updateD3DBufferUsage(GL_STATIC_DRAW);
}
}
}
gl::Error BufferD3D::getIndexRange(GLenum type,
size_t offset,
size_t count,
bool primitiveRestartEnabled,
gl::IndexRange *outRange)
{
const uint8_t *data = nullptr;
gl::Error error = getData(&data);
if (error.isError())
{
return error;
}
*outRange = gl::ComputeIndexRange(type, data + offset, count, primitiveRestartEnabled);
return gl::Error(GL_NO_ERROR);
}
} // namespace rx
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