Shader.cpp

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Author : Jamie Madill
Date : 2015-10-14 17:07:05
Hash : d2c52e3b
Message : Fix debug annotations and shaders. The Program refactor inadvertantly broken Debug annotations. Fix this by correctly passing the path to the temporary shader source in the first "C" string argument to ShCompile, instead of as the first part of the source string. BUG=angleproject:1177 TEST=manual testing with MSVS Change-Id: Ie77bb11b51645a474b542ddd2ae0f391e019e341 Reviewed-on: https://chromium-review.googlesource.com/306210 Tryjob-Request: Jamie Madill <jmadill@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
src/libANGLE/Shader.cpp
//
// Copyright (c) 2002-2014 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.
//

// Shader.cpp: Implements the gl::Shader class and its  derived classes
// VertexShader and FragmentShader. Implements GL shader objects and related
// functionality. [OpenGL ES 2.0.24] section 2.10 page 24 and section 3.8 page 84.

#include "libANGLE/Shader.h"

#include <sstream>

#include "common/utilities.h"
#include "GLSLANG/ShaderLang.h"
#include "libANGLE/Compiler.h"
#include "libANGLE/Constants.h"
#include "libANGLE/renderer/Renderer.h"
#include "libANGLE/renderer/ShaderImpl.h"
#include "libANGLE/ResourceManager.h"

namespace gl
{

namespace
{
template <typename VarT>
std::vector<VarT> GetActiveShaderVariables(const std::vector<VarT> *variableList)
{
    ASSERT(variableList);
    std::vector<VarT> result;
    for (size_t varIndex = 0; varIndex < variableList->size(); varIndex++)
    {
        const VarT &var = variableList->at(varIndex);
        if (var.staticUse)
        {
            result.push_back(var);
        }
    }
    return result;
}

template <typename VarT>
const std::vector<VarT> &GetShaderVariables(const std::vector<VarT> *variableList)
{
    ASSERT(variableList);
    return *variableList;
}

// true if varying x has a higher priority in packing than y
bool CompareVarying(const sh::Varying &x, const sh::Varying &y)
{
    if (x.type == y.type)
    {
        return x.arraySize > y.arraySize;
    }

    // Special case for handling structs: we sort these to the end of the list
    if (x.type == GL_STRUCT_ANGLEX)
    {
        return false;
    }

    if (y.type == GL_STRUCT_ANGLEX)
    {
        return true;
    }

    return gl::VariableSortOrder(x.type) < gl::VariableSortOrder(y.type);
}

}  // anonymous namespace

Shader::Data::Data(GLenum shaderType) : mShaderType(shaderType), mShaderVersion(100)
{
}

Shader::Data::~Data()
{
}

Shader::Shader(ResourceManager *manager,
               rx::ImplFactory *implFactory,
               const gl::Limitations &rendererLimitations,
               GLenum type,
               GLuint handle)
    : mData(type),
      mImplementation(implFactory->createShader(mData)),
      mRendererLimitations(rendererLimitations),
      mHandle(handle),
      mType(type),
      mRefCount(0),
      mDeleteStatus(false),
      mCompiled(false),
      mResourceManager(manager)
{
    ASSERT(mImplementation);
}

Shader::~Shader()
{
    SafeDelete(mImplementation);
}

GLuint Shader::getHandle() const
{
    return mHandle;
}

void Shader::setSource(GLsizei count, const char *const *string, const GLint *length)
{
    std::ostringstream stream;

    for (int i = 0; i < count; i++)
    {
        if (length == nullptr || length[i] < 0)
        {
            stream.write(string[i], strlen(string[i]));
        }
        else
        {
            stream.write(string[i], length[i]);
        }
    }

    mData.mSource = stream.str();
}

int Shader::getInfoLogLength() const
{
    if (mInfoLog.empty())
    {
        return 0;
    }

    return (static_cast<int>(mInfoLog.length()) + 1);
}

void Shader::getInfoLog(GLsizei bufSize, GLsizei *length, char *infoLog) const
{
    int index = 0;

    if (bufSize > 0)
    {
        index = std::min(bufSize - 1, static_cast<GLsizei>(mInfoLog.length()));
        memcpy(infoLog, mInfoLog.c_str(), index);

        infoLog[index] = '\0';
    }

    if (length)
    {
        *length = index;
    }
}

int Shader::getSourceLength() const
{
    return mData.mSource.empty() ? 0 : (static_cast<int>(mData.mSource.length()) + 1);
}

int Shader::getTranslatedSourceLength() const
{
    if (mData.mTranslatedSource.empty())
    {
        return 0;
    }

    return (static_cast<int>(mData.mTranslatedSource.length()) + 1);
}

void Shader::getSourceImpl(const std::string &source, GLsizei bufSize, GLsizei *length, char *buffer)
{
    int index = 0;

    if (bufSize > 0)
    {
        index = std::min(bufSize - 1, static_cast<GLsizei>(source.length()));
        memcpy(buffer, source.c_str(), index);

        buffer[index] = '\0';
    }

    if (length)
    {
        *length = index;
    }
}

void Shader::getSource(GLsizei bufSize, GLsizei *length, char *buffer) const
{
    getSourceImpl(mData.mSource, bufSize, length, buffer);
}

void Shader::getTranslatedSource(GLsizei bufSize, GLsizei *length, char *buffer) const
{
    getSourceImpl(mData.mTranslatedSource, bufSize, length, buffer);
}

void Shader::getTranslatedSourceWithDebugInfo(GLsizei bufSize, GLsizei *length, char *buffer) const
{
    std::string debugInfo(mImplementation->getDebugInfo());
    getSourceImpl(debugInfo, bufSize, length, buffer);
}

void Shader::compile(Compiler *compiler)
{
    mData.mTranslatedSource.clear();
    mInfoLog.clear();
    mData.mShaderVersion = 100;
    mData.mVaryings.clear();
    mData.mUniforms.clear();
    mData.mInterfaceBlocks.clear();
    mData.mActiveAttributes.clear();
    mData.mActiveOutputVariables.clear();

    ShHandle compilerHandle = compiler->getCompilerHandle(mData.mShaderType);

    std::stringstream sourceStream;

    std::string sourcePath;
    int additionalOptions =
        mImplementation->prepareSourceAndReturnOptions(&sourceStream, &sourcePath);
    int compileOptions    = (SH_OBJECT_CODE | SH_VARIABLES | additionalOptions);

    // Some targets (eg D3D11 Feature Level 9_3 and below) do not support non-constant loop indexes
    // in fragment shaders. Shader compilation will fail. To provide a better error message we can
    // instruct the compiler to pre-validate.
    if (mRendererLimitations.shadersRequireIndexedLoopValidation)
    {
        compileOptions |= SH_VALIDATE_LOOP_INDEXING;
    }

    std::string sourceString  = sourceStream.str();
    std::vector<const char *> sourceCStrings;

    if (!sourcePath.empty())
    {
        sourceCStrings.push_back(sourcePath.c_str());
    }

    sourceCStrings.push_back(sourceString.c_str());

    bool result =
        ShCompile(compilerHandle, &sourceCStrings[0], sourceCStrings.size(), compileOptions);

    if (!result)
    {
        mInfoLog = ShGetInfoLog(compilerHandle);
        TRACE("\n%s", mInfoLog.c_str());
        mCompiled = false;
        return;
    }

    mData.mTranslatedSource = ShGetObjectCode(compilerHandle);

#ifndef NDEBUG
    // Prefix translated shader with commented out un-translated shader.
    // Useful in diagnostics tools which capture the shader source.
    std::ostringstream shaderStream;
    shaderStream << "// GLSL\n";
    shaderStream << "//\n";

    size_t curPos = 0;
    while (curPos != std::string::npos)
    {
        size_t nextLine = mData.mSource.find("\n", curPos);
        size_t len      = (nextLine == std::string::npos) ? std::string::npos : (nextLine - curPos + 1);

        shaderStream << "// " << mData.mSource.substr(curPos, len);

        curPos = (nextLine == std::string::npos) ? std::string::npos : (nextLine + 1);
    }
    shaderStream << "\n\n";
    shaderStream << mData.mTranslatedSource;
    mData.mTranslatedSource = shaderStream.str();
#endif

    // Gather the shader information
    mData.mShaderVersion = ShGetShaderVersion(compilerHandle);

    mData.mVaryings        = GetShaderVariables(ShGetVaryings(compilerHandle));
    mData.mUniforms        = GetShaderVariables(ShGetUniforms(compilerHandle));
    mData.mInterfaceBlocks = GetShaderVariables(ShGetInterfaceBlocks(compilerHandle));

    if (mData.mShaderType == GL_VERTEX_SHADER)
    {
        mData.mActiveAttributes = GetActiveShaderVariables(ShGetAttributes(compilerHandle));
    }
    else
    {
        ASSERT(mData.mShaderType == GL_FRAGMENT_SHADER);

        // TODO(jmadill): Figure out why we only sort in the FS, and if we need to.
        std::sort(mData.mVaryings.begin(), mData.mVaryings.end(), CompareVarying);
        mData.mActiveOutputVariables =
            GetActiveShaderVariables(ShGetOutputVariables(compilerHandle));
    }

    ASSERT(!mData.mTranslatedSource.empty());

    mCompiled = mImplementation->postTranslateCompile(compiler, &mInfoLog);
}

void Shader::addRef()
{
    mRefCount++;
}

void Shader::release()
{
    mRefCount--;

    if (mRefCount == 0 && mDeleteStatus)
    {
        mResourceManager->deleteShader(mHandle);
    }
}

unsigned int Shader::getRefCount() const
{
    return mRefCount;
}

bool Shader::isFlaggedForDeletion() const
{
    return mDeleteStatus;
}

void Shader::flagForDeletion()
{
    mDeleteStatus = true;
}

int Shader::getShaderVersion() const
{
    return mData.mShaderVersion;
}

const std::vector<sh::Varying> &Shader::getVaryings() const
{
    return mData.getVaryings();
}

const std::vector<sh::Uniform> &Shader::getUniforms() const
{
    return mData.getUniforms();
}

const std::vector<sh::InterfaceBlock> &Shader::getInterfaceBlocks() const
{
    return mData.getInterfaceBlocks();
}

const std::vector<sh::Attribute> &Shader::getActiveAttributes() const
{
    return mData.getActiveAttributes();
}

const std::vector<sh::OutputVariable> &Shader::getActiveOutputVariables() const
{
    return mData.getActiveOutputVariables();
}

int Shader::getSemanticIndex(const std::string &attributeName) const
{
    if (!attributeName.empty())
    {
        const auto &activeAttributes = mData.getActiveAttributes();

        int semanticIndex = 0;
        for (size_t attributeIndex = 0; attributeIndex < activeAttributes.size(); attributeIndex++)
        {
            const sh::ShaderVariable &attribute = activeAttributes[attributeIndex];

            if (attribute.name == attributeName)
            {
                return semanticIndex;
            }

            semanticIndex += gl::VariableRegisterCount(attribute.type);
        }
    }

    return -1;
}

}
kc3-lang/angle/src/libANGLE/Shader.cpp

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kc3-lang/angle /src/libANGLE/Shader.cpp
