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//
// Copyright 2013 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/blocklayoutHLSL.h"
#include "common/mathutil.h"
#include "common/utilities.h"
namespace sh
{
HLSLBlockEncoder::HLSLBlockEncoder(HLSLBlockEncoderStrategy strategy, bool transposeMatrices)
: mEncoderStrategy(strategy), mTransposeMatrices(transposeMatrices)
{}
void HLSLBlockEncoder::enterAggregateType(const ShaderVariable &structVar)
{
align(kComponentsPerRegister);
}
void HLSLBlockEncoder::exitAggregateType(const ShaderVariable &structVar) {}
void HLSLBlockEncoder::getBlockLayoutInfo(GLenum typeIn,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int *arrayStrideOut,
int *matrixStrideOut)
{
GLenum type = (mTransposeMatrices ? gl::TransposeMatrixType(typeIn) : typeIn);
// We assume we are only dealing with 4 byte components (no doubles or half-words currently)
ASSERT(gl::VariableComponentSize(gl::VariableComponentType(type)) == kBytesPerComponent);
int matrixStride = 0;
int arrayStride = 0;
// if variables are not to be packed, or we're about to
// pack a matrix or array, skip to the start of the next
// register
if (!isPacked() || gl::IsMatrixType(type) || !arraySizes.empty())
{
align(kComponentsPerRegister);
}
if (gl::IsMatrixType(type))
{
matrixStride = kComponentsPerRegister;
if (!arraySizes.empty())
{
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
arrayStride = kComponentsPerRegister * numRegisters;
}
}
else if (!arraySizes.empty())
{
arrayStride = kComponentsPerRegister;
}
else if (isPacked())
{
int numComponents = gl::VariableComponentCount(type);
if ((numComponents + (mCurrentOffset % kComponentsPerRegister)) > kComponentsPerRegister)
{
align(kComponentsPerRegister);
}
}
*matrixStrideOut = matrixStride;
*arrayStrideOut = arrayStride;
}
void HLSLBlockEncoder::advanceOffset(GLenum typeIn,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int arrayStride,
int matrixStride)
{
GLenum type = (mTransposeMatrices ? gl::TransposeMatrixType(typeIn) : typeIn);
if (!arraySizes.empty())
{
unsigned int arraySize = gl::ArraySizeProduct(arraySizes);
if (arraySize > 0)
{
mCurrentOffset += arrayStride * (arraySize - 1);
}
}
if (gl::IsMatrixType(type))
{
ASSERT(matrixStride == kComponentsPerRegister);
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
const int numComponents = gl::MatrixComponentCount(type, isRowMajorMatrix);
mCurrentOffset += kComponentsPerRegister * (numRegisters - 1);
mCurrentOffset += numComponents;
}
else if (isPacked())
{
mCurrentOffset += gl::VariableComponentCount(type);
}
else
{
mCurrentOffset += kComponentsPerRegister;
}
}
void HLSLBlockEncoder::skipRegisters(unsigned int numRegisters)
{
mCurrentOffset += (numRegisters * kComponentsPerRegister);
}
HLSLBlockEncoder::HLSLBlockEncoderStrategy HLSLBlockEncoder::GetStrategyFor(
ShShaderOutput outputType)
{
switch (outputType)
{
case SH_HLSL_3_0_OUTPUT:
return ENCODE_LOOSE;
case SH_HLSL_4_1_OUTPUT:
case SH_HLSL_4_0_FL9_3_OUTPUT:
return ENCODE_PACKED;
default:
UNREACHABLE();
return ENCODE_PACKED;
}
}
template <class ShaderVarType>
void HLSLVariableRegisterCount(const ShaderVarType &variable, HLSLBlockEncoder *encoder)
{
if (variable.isStruct())
{
for (size_t arrayElement = 0; arrayElement < variable.getArraySizeProduct(); arrayElement++)
{
encoder->enterAggregateType(variable);
for (const ShaderVariable &field : variable.fields)
{
HLSLVariableRegisterCount(field, encoder);
}
encoder->exitAggregateType(variable);
}
}
else
{
// We operate only on varyings and uniforms, which do not have matrix layout qualifiers
encoder->encodeType(variable.type, variable.arraySizes, false);
}
}
unsigned int HLSLVariableRegisterCount(const ShaderVariable &variable, ShShaderOutput outputType)
{
HLSLBlockEncoder encoder(HLSLBlockEncoder::GetStrategyFor(outputType), true);
HLSLVariableRegisterCount(variable, &encoder);
const size_t registerBytes = (encoder.kBytesPerComponent * encoder.kComponentsPerRegister);
return static_cast<unsigned int>(
rx::roundUp<size_t>(encoder.getCurrentOffset(), registerBytes) / registerBytes);
}
} // namespace sh
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