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//
// Copyright (c) 2013-2014 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.
//
// blocklayout.cpp:
// Implementation for block layout classes and methods.
//
#include "compiler/translator/blocklayout.h"
#include "common/mathutil.h"
#include "common/utilities.h"
namespace sh
{
BlockLayoutEncoder::BlockLayoutEncoder()
: mCurrentOffset(0)
{
}
BlockMemberInfo BlockLayoutEncoder::encodeType(GLenum type, unsigned int arraySize, bool isRowMajorMatrix)
{
int arrayStride;
int matrixStride;
getBlockLayoutInfo(type, arraySize, isRowMajorMatrix, &arrayStride, &matrixStride);
const BlockMemberInfo memberInfo(static_cast<int>(mCurrentOffset * BytesPerComponent),
static_cast<int>(arrayStride * BytesPerComponent),
static_cast<int>(matrixStride * BytesPerComponent),
isRowMajorMatrix);
advanceOffset(type, arraySize, isRowMajorMatrix, arrayStride, matrixStride);
return memberInfo;
}
// static
size_t BlockLayoutEncoder::getBlockRegister(const BlockMemberInfo &info)
{
return (info.offset / BytesPerComponent) / ComponentsPerRegister;
}
// static
size_t BlockLayoutEncoder::getBlockRegisterElement(const BlockMemberInfo &info)
{
return (info.offset / BytesPerComponent) % ComponentsPerRegister;
}
void BlockLayoutEncoder::nextRegister()
{
mCurrentOffset = rx::roundUp<size_t>(mCurrentOffset, ComponentsPerRegister);
}
Std140BlockEncoder::Std140BlockEncoder()
{
}
void Std140BlockEncoder::enterAggregateType()
{
nextRegister();
}
void Std140BlockEncoder::exitAggregateType()
{
nextRegister();
}
void Std140BlockEncoder::getBlockLayoutInfo(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int *arrayStrideOut, int *matrixStrideOut)
{
// We assume we are only dealing with 4 byte components (no doubles or half-words currently)
ASSERT(gl::VariableComponentSize(gl::VariableComponentType(type)) == BytesPerComponent);
size_t baseAlignment = 0;
int matrixStride = 0;
int arrayStride = 0;
if (gl::IsMatrixType(type))
{
baseAlignment = ComponentsPerRegister;
matrixStride = ComponentsPerRegister;
if (arraySize > 0)
{
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
arrayStride = ComponentsPerRegister * numRegisters;
}
}
else if (arraySize > 0)
{
baseAlignment = ComponentsPerRegister;
arrayStride = ComponentsPerRegister;
}
else
{
const int numComponents = gl::VariableComponentCount(type);
baseAlignment = (numComponents == 3 ? 4u : static_cast<size_t>(numComponents));
}
mCurrentOffset = rx::roundUp(mCurrentOffset, baseAlignment);
*matrixStrideOut = matrixStride;
*arrayStrideOut = arrayStride;
}
void Std140BlockEncoder::advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride)
{
if (arraySize > 0)
{
mCurrentOffset += arrayStride * arraySize;
}
else if (gl::IsMatrixType(type))
{
ASSERT(matrixStride == ComponentsPerRegister);
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
mCurrentOffset += ComponentsPerRegister * numRegisters;
}
else
{
mCurrentOffset += gl::VariableComponentCount(type);
}
}
}
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