blocklayout.cpp

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Author : Jamie Madill
Date : 2014-06-25 16:04:54
Hash : f2575989
Message : Use the sh namespace for shader variables. Since these types originate from the translator, use an appropriate namespace. Also rename some of the gl helper functions to be more specific to their functionality. BUG=angle:466 Change-Id: Idc29987b2053b3c40748dd46b581f3dbd8a6fd61 Reviewed-on: https://chromium-review.googlesource.com/204680 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
src/common/blocklayout.cpp
//
// 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 "common/blocklayout.h"
#include "common/shadervars.h"
#include "common/mathutil.h"
#include "common/utilities.h"

namespace sh
{

BlockLayoutEncoder::BlockLayoutEncoder(std::vector<BlockMemberInfo> *blockInfoOut)
    : mCurrentOffset(0),
      mBlockInfoOut(blockInfoOut)
{
}

void BlockLayoutEncoder::encodeInterfaceBlockFields(const std::vector<InterfaceBlockField> &fields)
{
    for (unsigned int fieldIndex = 0; fieldIndex < fields.size(); fieldIndex++)
    {
        const InterfaceBlockField &variable = fields[fieldIndex];

        if (variable.fields.size() > 0)
        {
            const unsigned int elementCount = std::max(1u, variable.arraySize);

            for (unsigned int elementIndex = 0; elementIndex < elementCount; elementIndex++)
            {
                enterAggregateType();
                encodeInterfaceBlockFields(variable.fields);
                exitAggregateType();
            }
        }
        else
        {
            encodeInterfaceBlockField(variable);
        }
    }
}

void BlockLayoutEncoder::encodeInterfaceBlockField(const InterfaceBlockField &field)
{
    int arrayStride;
    int matrixStride;

    ASSERT(field.fields.empty());
    getBlockLayoutInfo(field.type, field.arraySize, field.isRowMajorMatrix, &arrayStride, &matrixStride);

    const BlockMemberInfo memberInfo(mCurrentOffset * BytesPerComponent, arrayStride * BytesPerComponent, matrixStride * BytesPerComponent, field.isRowMajorMatrix);

    if (mBlockInfoOut)
    {
        mBlockInfoOut->push_back(memberInfo);
    }

    advanceOffset(field.type, field.arraySize, field.isRowMajorMatrix, arrayStride, matrixStride);
}

void BlockLayoutEncoder::encodeType(GLenum type, unsigned int arraySize, bool isRowMajorMatrix)
{
    int arrayStride;
    int matrixStride;

    getBlockLayoutInfo(type, arraySize, isRowMajorMatrix, &arrayStride, &matrixStride);

    const BlockMemberInfo memberInfo(mCurrentOffset * BytesPerComponent, arrayStride * BytesPerComponent, matrixStride * BytesPerComponent, isRowMajorMatrix);

    if (mBlockInfoOut)
    {
        mBlockInfoOut->push_back(memberInfo);
    }

    advanceOffset(type, arraySize, isRowMajorMatrix, arrayStride, matrixStride);
}

void BlockLayoutEncoder::nextRegister()
{
    mCurrentOffset = rx::roundUp<size_t>(mCurrentOffset, ComponentsPerRegister);
}

Std140BlockEncoder::Std140BlockEncoder(std::vector<BlockMemberInfo> *blockInfoOut)
    : BlockLayoutEncoder(blockInfoOut)
{
}

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);
    }
}

HLSLBlockEncoder::HLSLBlockEncoder(std::vector<BlockMemberInfo> *blockInfoOut, HLSLBlockEncoderStrategy strategy)
    : BlockLayoutEncoder(blockInfoOut),
      mEncoderStrategy(strategy)
{
}

void HLSLBlockEncoder::enterAggregateType()
{
    nextRegister();
}

void HLSLBlockEncoder::exitAggregateType()
{
}

void HLSLBlockEncoder::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);

    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) ||
        arraySize > 0)
    {
        nextRegister();
    }

    if (gl::IsMatrixType(type))
    {
        matrixStride = ComponentsPerRegister;

        if (arraySize > 0)
        {
            const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
            arrayStride = ComponentsPerRegister * numRegisters;
        }
    }
    else if (arraySize > 0)
    {
        arrayStride = ComponentsPerRegister;
    }
    else if (isPacked())
    {
        int numComponents = gl::VariableComponentCount(type);
        if ((numComponents + (mCurrentOffset % ComponentsPerRegister)) > ComponentsPerRegister)
        {
            nextRegister();
        }
    }

    *matrixStrideOut = matrixStride;
    *arrayStrideOut = arrayStride;
}

void HLSLBlockEncoder::advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride)
{
    if (arraySize > 0)
    {
        mCurrentOffset += arrayStride * (arraySize - 1);
    }

    if (gl::IsMatrixType(type))
    {
        ASSERT(matrixStride == ComponentsPerRegister);
        const int numRegisters = gl::MatrixRegisterCount(type, isRowMajorMatrix);
        const int numComponents = gl::MatrixComponentCount(type, isRowMajorMatrix);
        mCurrentOffset += ComponentsPerRegister * (numRegisters - 1);
        mCurrentOffset += numComponents;
    }
    else if (isPacked())
    {
        mCurrentOffset += gl::VariableComponentCount(type);
    }
    else
    {
        mCurrentOffset += ComponentsPerRegister;
    }
}

void HLSLBlockEncoder::skipRegisters(unsigned int numRegisters)
{
    mCurrentOffset += (numRegisters * ComponentsPerRegister);
}

void HLSLVariableGetRegisterInfo(unsigned int baseRegisterIndex, Uniform *variable, HLSLBlockEncoder *encoder,
                                 const std::vector<BlockMemberInfo> &blockInfo, ShShaderOutput outputType)
{
    // because this method computes offsets (element indexes) instead of any total sizes,
    // we can ignore the array size of the variable

    if (variable->isStruct())
    {
        encoder->enterAggregateType();

        variable->registerIndex = baseRegisterIndex;

        for (size_t fieldIndex = 0; fieldIndex < variable->fields.size(); fieldIndex++)
        {
            HLSLVariableGetRegisterInfo(baseRegisterIndex, &variable->fields[fieldIndex], encoder, blockInfo, outputType);
        }

        // Since the above loop only encodes one element of an array, ensure we don't lose track of the
        // current register offset
        if (variable->isArray())
        {
            unsigned int structRegisterCount = (HLSLVariableRegisterCount(*variable, outputType) / variable->arraySize);
            encoder->skipRegisters(structRegisterCount * (variable->arraySize - 1));
        }

        encoder->exitAggregateType();
    }
    else
    {
        encoder->encodeType(variable->type, variable->arraySize, false);

        const size_t registerBytes = (encoder->BytesPerComponent * encoder->ComponentsPerRegister);
        variable->registerIndex = baseRegisterIndex + (blockInfo.back().offset / registerBytes);
        variable->elementIndex = (blockInfo.back().offset % registerBytes) / sizeof(float);
    }
}

void HLSLVariableGetRegisterInfo(unsigned int baseRegisterIndex, Uniform *variable, ShShaderOutput outputType)
{
    std::vector<BlockMemberInfo> blockInfo;
    HLSLBlockEncoder encoder(&blockInfo,
                             outputType == SH_HLSL9_OUTPUT ? HLSLBlockEncoder::ENCODE_LOOSE
                                                           : HLSLBlockEncoder::ENCODE_PACKED);
    HLSLVariableGetRegisterInfo(baseRegisterIndex, variable, &encoder, blockInfo, outputType);
}

template <class ShaderVarType>
void HLSLVariableRegisterCount(const ShaderVarType &variable, HLSLBlockEncoder *encoder)
{
    if (variable.isStruct())
    {
        for (size_t arrayElement = 0; arrayElement < variable.elementCount(); arrayElement++)
        {
            encoder->enterAggregateType();

            for (size_t fieldIndex = 0; fieldIndex < variable.fields.size(); fieldIndex++)
            {
                HLSLVariableRegisterCount(variable.fields[fieldIndex], encoder);
            }

            encoder->exitAggregateType();
        }
    }
    else
    {
        // We operate only on varyings and uniforms, which do not have matrix layout qualifiers
        encoder->encodeType(variable.type, variable.arraySize, false);
    }
}

unsigned int HLSLVariableRegisterCount(const Varying &variable)
{
    HLSLBlockEncoder encoder(NULL, HLSLBlockEncoder::ENCODE_PACKED);
    HLSLVariableRegisterCount(variable, &encoder);

    const size_t registerBytes = (encoder.BytesPerComponent * encoder.ComponentsPerRegister);
    return static_cast<unsigned int>(rx::roundUp<size_t>(encoder.getBlockSize(), registerBytes) / registerBytes);
}

unsigned int HLSLVariableRegisterCount(const Uniform &variable, ShShaderOutput outputType)
{
    HLSLBlockEncoder encoder(NULL,
                             outputType == SH_HLSL9_OUTPUT ? HLSLBlockEncoder::ENCODE_LOOSE
                                                           : HLSLBlockEncoder::ENCODE_PACKED);

    HLSLVariableRegisterCount(variable, &encoder);

    const size_t registerBytes = (encoder.BytesPerComponent * encoder.ComponentsPerRegister);
    return static_cast<unsigned int>(rx::roundUp<size_t>(encoder.getBlockSize(), registerBytes) / registerBytes);
}

}
kc3-lang/angle/src/common/blocklayout.cpp

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kc3-lang/angle /src/common/blocklayout.cpp
