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//
// 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.
//
// VertexBuffer.cpp: Defines the abstract VertexBuffer class and VertexBufferInterface
// class with derivations, classes that perform graphics API agnostic vertex buffer operations.
#include "libANGLE/renderer/d3d/VertexBuffer.h"
#include "common/mathutil.h"
#include "libANGLE/renderer/d3d/BufferD3D.h"
#include "libANGLE/renderer/d3d/RendererD3D.h"
#include "libANGLE/VertexAttribute.h"
namespace rx
{
// VertexBuffer Implementation
unsigned int VertexBuffer::mNextSerial = 1;
VertexBuffer::VertexBuffer() : mRefCount(1)
{
updateSerial();
}
VertexBuffer::~VertexBuffer()
{
}
void VertexBuffer::updateSerial()
{
mSerial = mNextSerial++;
}
unsigned int VertexBuffer::getSerial() const
{
return mSerial;
}
void VertexBuffer::addRef()
{
mRefCount++;
}
void VertexBuffer::release()
{
ASSERT(mRefCount > 0);
mRefCount--;
if (mRefCount == 0)
{
delete this;
}
}
// VertexBufferInterface Implementation
VertexBufferInterface::VertexBufferInterface(BufferFactoryD3D *factory, bool dynamic)
: mFactory(factory), mVertexBuffer(factory->createVertexBuffer()), mDynamic(dynamic)
{
}
VertexBufferInterface::~VertexBufferInterface()
{
if (mVertexBuffer)
{
mVertexBuffer->release();
}
}
unsigned int VertexBufferInterface::getSerial() const
{
return mVertexBuffer->getSerial();
}
unsigned int VertexBufferInterface::getBufferSize() const
{
return mVertexBuffer->getBufferSize();
}
gl::Error VertexBufferInterface::setBufferSize(unsigned int size)
{
if (mVertexBuffer->getBufferSize() == 0)
{
return mVertexBuffer->initialize(size, mDynamic);
}
return mVertexBuffer->setBufferSize(size);
}
gl::ErrorOrResult<unsigned int> VertexBufferInterface::getSpaceRequired(
const gl::VertexAttribute &attrib,
GLsizei count,
GLsizei instances) const
{
unsigned int spaceRequired = 0;
ANGLE_TRY_RESULT(mFactory->getVertexSpaceRequired(attrib, count, instances), spaceRequired);
// Align to 16-byte boundary
unsigned int alignedSpaceRequired = roundUp(spaceRequired, 16u);
if (alignedSpaceRequired < spaceRequired)
{
return gl::Error(GL_OUT_OF_MEMORY,
"Vertex buffer overflow in VertexBufferInterface::getSpaceRequired.");
}
return alignedSpaceRequired;
}
gl::Error VertexBufferInterface::discard()
{
return mVertexBuffer->discard();
}
VertexBuffer *VertexBufferInterface::getVertexBuffer() const
{
return mVertexBuffer;
}
// StreamingVertexBufferInterface Implementation
StreamingVertexBufferInterface::StreamingVertexBufferInterface(BufferFactoryD3D *factory,
std::size_t initialSize)
: VertexBufferInterface(factory, true), mWritePosition(0), mReservedSpace(0)
{
setBufferSize(static_cast<unsigned int>(initialSize));
}
StreamingVertexBufferInterface::~StreamingVertexBufferInterface()
{
}
gl::Error StreamingVertexBufferInterface::reserveSpace(unsigned int size)
{
unsigned int curBufferSize = getBufferSize();
if (size > curBufferSize)
{
ANGLE_TRY(setBufferSize(std::max(size, 3 * curBufferSize / 2)));
mWritePosition = 0;
}
else if (mWritePosition + size > curBufferSize)
{
ANGLE_TRY(discard());
mWritePosition = 0;
}
return gl::NoError();
}
gl::Error StreamingVertexBufferInterface::storeDynamicAttribute(const gl::VertexAttribute &attrib,
GLenum currentValueType,
GLint start,
GLsizei count,
GLsizei instances,
unsigned int *outStreamOffset,
const uint8_t *sourceData)
{
unsigned int spaceRequired = 0;
ANGLE_TRY_RESULT(getSpaceRequired(attrib, count, instances), spaceRequired);
// Protect against integer overflow
angle::CheckedNumeric<unsigned int> checkedPosition(mWritePosition);
checkedPosition += spaceRequired;
if (!checkedPosition.IsValid())
{
return gl::Error(GL_OUT_OF_MEMORY, "Internal error, new vertex buffer write position would overflow.");
}
ANGLE_TRY(reserveSpace(mReservedSpace));
mReservedSpace = 0;
ANGLE_TRY(mVertexBuffer->storeVertexAttributes(attrib, currentValueType, start, count,
instances, mWritePosition, sourceData));
if (outStreamOffset)
{
*outStreamOffset = mWritePosition;
}
mWritePosition += spaceRequired;
return gl::NoError();
}
gl::Error StreamingVertexBufferInterface::reserveVertexSpace(const gl::VertexAttribute &attrib,
GLsizei count,
GLsizei instances)
{
unsigned int requiredSpace = 0;
ANGLE_TRY_RESULT(mFactory->getVertexSpaceRequired(attrib, count, instances), requiredSpace);
// Align to 16-byte boundary
auto alignedRequiredSpace = rx::CheckedRoundUp(requiredSpace, 16u);
alignedRequiredSpace += mReservedSpace;
// Protect against integer overflow
if (!alignedRequiredSpace.IsValid())
{
return gl::Error(GL_OUT_OF_MEMORY,
"Unable to reserve %u extra bytes in internal vertex buffer, "
"it would result in an overflow.",
requiredSpace);
}
mReservedSpace = alignedRequiredSpace.ValueOrDie();
return gl::NoError();
}
// StaticVertexBufferInterface Implementation
StaticVertexBufferInterface::AttributeSignature::AttributeSignature()
: type(GL_NONE), size(0), stride(0), normalized(false), pureInteger(false), offset(0)
{
}
bool StaticVertexBufferInterface::AttributeSignature::matchesAttribute(
const gl::VertexAttribute &attrib) const
{
size_t attribStride = ComputeVertexAttributeStride(attrib);
if (type != attrib.type || size != attrib.size || static_cast<GLuint>(stride) != attribStride ||
normalized != attrib.normalized || pureInteger != attrib.pureInteger)
{
return false;
}
size_t attribOffset = (static_cast<size_t>(attrib.offset) % attribStride);
return (offset == attribOffset);
}
void StaticVertexBufferInterface::AttributeSignature::set(const gl::VertexAttribute &attrib)
{
type = attrib.type;
size = attrib.size;
normalized = attrib.normalized;
pureInteger = attrib.pureInteger;
offset = stride = static_cast<GLuint>(ComputeVertexAttributeStride(attrib));
offset = static_cast<size_t>(attrib.offset) % ComputeVertexAttributeStride(attrib);
}
StaticVertexBufferInterface::StaticVertexBufferInterface(BufferFactoryD3D *factory)
: VertexBufferInterface(factory, false)
{
}
StaticVertexBufferInterface::~StaticVertexBufferInterface()
{
}
bool StaticVertexBufferInterface::matchesAttribute(const gl::VertexAttribute &attrib) const
{
return mSignature.matchesAttribute(attrib);
}
void StaticVertexBufferInterface::setAttribute(const gl::VertexAttribute &attrib)
{
return mSignature.set(attrib);
}
gl::Error StaticVertexBufferInterface::storeStaticAttribute(const gl::VertexAttribute &attrib,
GLint start,
GLsizei count,
GLsizei instances,
const uint8_t *sourceData)
{
unsigned int spaceRequired = 0;
ANGLE_TRY_RESULT(getSpaceRequired(attrib, count, instances), spaceRequired);
setBufferSize(spaceRequired);
ASSERT(attrib.enabled);
ANGLE_TRY(mVertexBuffer->storeVertexAttributes(attrib, GL_NONE, start, count, instances, 0,
sourceData));
mSignature.set(attrib);
mVertexBuffer->hintUnmapResource();
return gl::NoError();
}
} // namespace rx
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