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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
{
namespace
{
bool IsRowMajorLayout(const InterfaceBlockField &var)
{
return var.isRowMajorLayout;
}
bool IsRowMajorLayout(const ShaderVariable &var)
{
return false;
}
template <typename VarT>
void GetUniformBlockStructMemberInfo(const std::vector<VarT> &fields,
const std::string &fieldName,
sh::BlockLayoutEncoder *encoder,
bool inRowMajorLayout,
BlockLayoutMap *blockInfoOut)
{
encoder->enterAggregateType();
GetUniformBlockInfo(fields, fieldName, encoder, inRowMajorLayout, blockInfoOut);
encoder->exitAggregateType();
}
template <typename VarT>
void GetUniformBlockStructArrayMemberInfo(const VarT &field,
unsigned int arrayNestingIndex,
const std::string &arrayName,
sh::BlockLayoutEncoder *encoder,
bool inRowMajorLayout,
BlockLayoutMap *blockInfoOut)
{
// Nested arrays are processed starting from outermost (arrayNestingIndex 0u) and ending at the
// innermost.
const unsigned int currentArraySize = field.getNestedArraySize(arrayNestingIndex);
for (unsigned int arrayElement = 0u; arrayElement < currentArraySize; ++arrayElement)
{
const std::string elementName = arrayName + ArrayString(arrayElement);
if (arrayNestingIndex + 1u < field.arraySizes.size())
{
GetUniformBlockStructArrayMemberInfo(field, arrayNestingIndex + 1u, elementName,
encoder, inRowMajorLayout, blockInfoOut);
}
else
{
GetUniformBlockStructMemberInfo(field.fields, elementName, encoder, inRowMajorLayout,
blockInfoOut);
}
}
}
template <typename VarT>
void GetUniformBlockArrayOfArraysMemberInfo(const VarT &field,
unsigned int arrayNestingIndex,
const std::string &arrayName,
sh::BlockLayoutEncoder *encoder,
bool inRowMajorLayout,
BlockLayoutMap *blockInfoOut)
{
const unsigned int currentArraySize = field.getNestedArraySize(arrayNestingIndex);
for (unsigned int arrayElement = 0u; arrayElement < currentArraySize; ++arrayElement)
{
const std::string elementName = arrayName + ArrayString(arrayElement);
if (arrayNestingIndex + 2u < field.arraySizes.size())
{
GetUniformBlockArrayOfArraysMemberInfo(field, arrayNestingIndex + 1u, elementName,
encoder, inRowMajorLayout, blockInfoOut);
}
else
{
std::vector<unsigned int> innermostArraySize(
1u, field.getNestedArraySize(arrayNestingIndex + 1u));
(*blockInfoOut)[elementName] =
encoder->encodeType(field.type, innermostArraySize, inRowMajorLayout);
}
}
}
} // anonymous namespace
BlockLayoutEncoder::BlockLayoutEncoder() : mCurrentOffset(0)
{
}
BlockMemberInfo BlockLayoutEncoder::encodeType(GLenum type,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix)
{
int arrayStride;
int matrixStride;
getBlockLayoutInfo(type, arraySizes, isRowMajorMatrix, &arrayStride, &matrixStride);
const BlockMemberInfo memberInfo(static_cast<int>(mCurrentOffset * BytesPerComponent),
static_cast<int>(arrayStride * BytesPerComponent),
static_cast<int>(matrixStride * BytesPerComponent),
isRowMajorMatrix);
advanceOffset(type, arraySizes, 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,
const std::vector<unsigned int> &arraySizes,
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 (!arraySizes.empty())
{
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
arrayStride = ComponentsPerRegister * numRegisters;
}
}
else if (!arraySizes.empty())
{
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,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int arrayStride,
int matrixStride)
{
if (!arraySizes.empty())
{
mCurrentOffset += arrayStride * gl::ArraySizeProduct(arraySizes);
}
else if (gl::IsMatrixType(type))
{
ASSERT(matrixStride == ComponentsPerRegister);
const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
mCurrentOffset += ComponentsPerRegister * numRegisters;
}
else
{
mCurrentOffset += gl::VariableComponentCount(type);
}
}
template <typename VarT>
void GetUniformBlockInfo(const std::vector<VarT> &fields,
const std::string &prefix,
sh::BlockLayoutEncoder *encoder,
bool inRowMajorLayout,
BlockLayoutMap *blockInfoOut)
{
for (const VarT &field : fields)
{
// Skip samplers. On Vulkan we use this for the default uniform block, so samplers may be
// included.
if (gl::IsSamplerType(field.type))
{
continue;
}
const std::string &fieldName = (prefix.empty() ? field.name : prefix + "." + field.name);
if (field.isStruct())
{
bool rowMajorLayout = (inRowMajorLayout || IsRowMajorLayout(field));
if (field.isArray())
{
GetUniformBlockStructArrayMemberInfo(field, 0u, fieldName, encoder, rowMajorLayout,
blockInfoOut);
}
else
{
GetUniformBlockStructMemberInfo(field.fields, fieldName, encoder, rowMajorLayout,
blockInfoOut);
}
}
else if (field.isArrayOfArrays())
{
bool isRowMajorMatrix = (gl::IsMatrixType(field.type) && inRowMajorLayout);
GetUniformBlockArrayOfArraysMemberInfo(field, 0u, fieldName, encoder, isRowMajorMatrix,
blockInfoOut);
}
else
{
bool isRowMajorMatrix = (gl::IsMatrixType(field.type) && inRowMajorLayout);
(*blockInfoOut)[fieldName] =
encoder->encodeType(field.type, field.arraySizes, isRowMajorMatrix);
}
}
}
template void GetUniformBlockInfo(const std::vector<InterfaceBlockField> &,
const std::string &,
sh::BlockLayoutEncoder *,
bool,
BlockLayoutMap *);
template void GetUniformBlockInfo(const std::vector<Uniform> &,
const std::string &,
sh::BlockLayoutEncoder *,
bool,
BlockLayoutMap *);
template void GetUniformBlockInfo(const std::vector<ShaderVariable> &,
const std::string &,
sh::BlockLayoutEncoder *,
bool,
BlockLayoutMap *);
} // namespace sh
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