shader_utils.cpp

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Author : jchen10
Date : 2018-07-06 13:47:01
Hash : 7ae70d8f
Message : ParallelCompile: Parallelize D3D linking This adds a new linking state to Program. If a Program is in linking state, on the one hand the foreground thread may continue issuing more GL calls, and on the other hand the background linking threads may be accessing Program internally too. Without a proper constraint there must be conflicts between them. For this purpose, we block any further GL calls to Program until it's actually linked. In addition, we prohibit parallel linking an active program, so that ProgramD3D does not have to worry about such similar conflicts. Also changes the WorkerThread to support limiting the number of concurrently running worker threads. BUG=chromium:849576 Change-Id: I52618647539323f8bf27201320bdf7301c4982e6 Reviewed-on: https://chromium-review.googlesource.com/1127495 Commit-Queue: Jie A Chen <jie.a.chen@intel.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>
util/shader_utils.cpp
//
// Copyright (c) 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.
//

#include "shader_utils.h"

#include <vector>
#include <iostream>
#include <fstream>

static std::string ReadFileToString(const std::string &source)
{
    std::ifstream stream(source.c_str());
    if (!stream)
    {
        std::cerr << "Failed to load shader file: " << source;
        return "";
    }

    std::string result;

    stream.seekg(0, std::ios::end);
    result.reserve(static_cast<unsigned int>(stream.tellg()));
    stream.seekg(0, std::ios::beg);

    result.assign((std::istreambuf_iterator<char>(stream)), std::istreambuf_iterator<char>());

    return result;
}

GLuint CompileShader(GLenum type, const std::string &source)
{
    GLuint shader = glCreateShader(type);

    const char *sourceArray[1] = { source.c_str() };
    glShaderSource(shader, 1, sourceArray, nullptr);
    glCompileShader(shader);

    GLint compileResult;
    glGetShaderiv(shader, GL_COMPILE_STATUS, &compileResult);

    if (compileResult == 0)
    {
        GLint infoLogLength;
        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);

        // Info log length includes the null terminator, so 1 means that the info log is an empty
        // string.
        if (infoLogLength > 1)
        {
            std::vector<GLchar> infoLog(infoLogLength);
            glGetShaderInfoLog(shader, static_cast<GLsizei>(infoLog.size()), nullptr, &infoLog[0]);
            std::cerr << "shader compilation failed: " << &infoLog[0];
        }
        else
        {
            std::cerr << "shader compilation failed. <Empty log message>";
        }

        std::cerr << std::endl;

        glDeleteShader(shader);
        shader = 0;
    }

    return shader;
}

GLuint CompileShaderFromFile(GLenum type, const std::string &sourcePath)
{
    std::string source = ReadFileToString(sourcePath);
    if (source.empty())
    {
        return 0;
    }

    return CompileShader(type, source);
}

GLuint CheckLinkStatusAndReturnProgram(GLuint program, bool outputErrorMessages)
{
    if (glGetError() != GL_NO_ERROR)
        return 0;

    GLint linkStatus;
    glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
    if (linkStatus == 0)
    {
        if (outputErrorMessages)
        {
            GLint infoLogLength;
            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infoLogLength);

            // Info log length includes the null terminator, so 1 means that the info log is an
            // empty string.
            if (infoLogLength > 1)
            {
                std::vector<GLchar> infoLog(infoLogLength);
                glGetProgramInfoLog(program, static_cast<GLsizei>(infoLog.size()), nullptr,
                                    &infoLog[0]);

                std::cerr << "program link failed: " << &infoLog[0];
            }
            else
            {
                std::cerr << "program link failed. <Empty log message>";
            }
        }

        glDeleteProgram(program);
        return 0;
    }

    return program;
}

GLuint CompileProgramWithTransformFeedback(
    const std::string &vsSource,
    const std::string &fsSource,
    const std::vector<std::string> &transformFeedbackVaryings,
    GLenum bufferMode)
{
    return CompileProgramWithGSAndTransformFeedback(vsSource, "", fsSource,
                                                    transformFeedbackVaryings, bufferMode);
}

static GLuint CompileAndLinkProgram(const std::string &vsSource,
                                    const std::string &gsSource,
                                    const std::string &fsSource,
                                    const std::vector<std::string> &transformFeedbackVaryings,
                                    GLenum bufferMode)
{
    GLuint program = glCreateProgram();

    GLuint vs = CompileShader(GL_VERTEX_SHADER, vsSource);
    GLuint fs = CompileShader(GL_FRAGMENT_SHADER, fsSource);

    if (vs == 0 || fs == 0)
    {
        glDeleteShader(fs);
        glDeleteShader(vs);
        glDeleteProgram(program);
        return 0;
    }

    glAttachShader(program, vs);
    glDeleteShader(vs);

    glAttachShader(program, fs);
    glDeleteShader(fs);

    if (!gsSource.empty())
    {
        GLuint gs = CompileShader(GL_GEOMETRY_SHADER_EXT, gsSource);
        if (gs == 0)
        {
            glDeleteShader(vs);
            glDeleteShader(fs);
            glDeleteProgram(program);
            return 0;
        }

        glAttachShader(program, gs);
        glDeleteShader(gs);
    }

    if (transformFeedbackVaryings.size() > 0)
    {
        std::vector<const char *> constCharTFVaryings;

        for (const std::string &transformFeedbackVarying : transformFeedbackVaryings)
        {
            constCharTFVaryings.push_back(transformFeedbackVarying.c_str());
        }

        glTransformFeedbackVaryings(program, static_cast<GLsizei>(transformFeedbackVaryings.size()),
                                    &constCharTFVaryings[0], bufferMode);
    }

    glLinkProgram(program);

    return program;
}

GLuint CompileProgramWithGSAndTransformFeedback(
    const std::string &vsSource,
    const std::string &gsSource,
    const std::string &fsSource,
    const std::vector<std::string> &transformFeedbackVaryings,
    GLenum bufferMode)
{
    GLuint program =
        CompileAndLinkProgram(vsSource, gsSource, fsSource, transformFeedbackVaryings, bufferMode);
    if (program == 0)
    {
        return 0;
    }
    return CheckLinkStatusAndReturnProgram(program, true);
}

GLuint CompileProgram(const std::string &vsSource, const std::string &fsSource)
{
    return CompileProgramWithGS(vsSource, "", fsSource);
}

GLuint CompileProgramParallel(const std::string &vsSource, const std::string &fsSource)
{
    std::vector<std::string> emptyVector;
    return CompileAndLinkProgram(vsSource, "", fsSource, emptyVector, GL_NONE);
}

GLuint CompileProgramWithGS(const std::string &vsSource,
                            const std::string &gsSource,
                            const std::string &fsSource)
{
    std::vector<std::string> emptyVector;
    return CompileProgramWithGSAndTransformFeedback(vsSource, gsSource, fsSource, emptyVector,
                                                    GL_NONE);
}

GLuint CompileProgramFromFiles(const std::string &vsPath, const std::string &fsPath)
{
    std::string vsSource = ReadFileToString(vsPath);
    std::string fsSource = ReadFileToString(fsPath);
    if (vsSource.empty() || fsSource.empty())
    {
        return 0;
    }

    return CompileProgram(vsSource, fsSource);
}

GLuint CompileComputeProgram(const std::string &csSource, bool outputErrorMessages)
{
    GLuint program = glCreateProgram();

    GLuint cs = CompileShader(GL_COMPUTE_SHADER, csSource);
    if (cs == 0)
    {
        glDeleteProgram(program);
        return 0;
    }

    glAttachShader(program, cs);

    glLinkProgram(program);

    return CheckLinkStatusAndReturnProgram(program, outputErrorMessages);
}

GLuint LoadBinaryProgramOES(const std::vector<uint8_t> &binary, GLenum binaryFormat)
{
    GLuint program = glCreateProgram();
    glProgramBinaryOES(program, binaryFormat, binary.data(), static_cast<GLint>(binary.size()));
    return CheckLinkStatusAndReturnProgram(program, true);
}

GLuint LoadBinaryProgramES3(const std::vector<uint8_t> &binary, GLenum binaryFormat)
{
    GLuint program = glCreateProgram();
    glProgramBinary(program, binaryFormat, binary.data(), static_cast<GLint>(binary.size()));
    return CheckLinkStatusAndReturnProgram(program, true);
}

bool LinkAttachedProgram(GLuint program)
{
    glLinkProgram(program);
    return (CheckLinkStatusAndReturnProgram(program, true) != 0);
}

namespace angle
{

namespace essl1_shaders
{

const char *PositionAttrib()
{
    return "a_position";
}
const char *ColorUniform()
{
    return "u_color";
}

namespace vs
{

// A shader that sets gl_Position to zero.
const char *Zero()
{
    return R"(void main()
{
    gl_Position = vec4(0);
})";
}

// A shader that sets gl_Position to attribute a_position.
const char *Simple()
{
    return R"(precision highp float;
attribute vec4 a_position;

void main()
{
    gl_Position = a_position;
})";
}

// A shader that simply passes through attribute a_position, setting it to gl_Position and varying
// pos.
const char *Passthrough()
{
    return R"(precision highp float;
attribute vec4 a_position;
varying vec4 v_position;

void main()
{
    gl_Position = a_position;
    v_position = a_position;
})";
}

}  // namespace vs

namespace fs
{

// A shader that renders a simple checker pattern of red and green. X axis and y axis separate the
// different colors. Needs varying v_position.
const char *Checkered()
{
    return R"(precision highp float;
varying vec4 v_position;

void main()
{
    if (v_position.x * v_position.y > 0.0)
    {
        gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
    }
    else
    {
        gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
    }
})";
}

// A shader that fills with color taken from uniform named "color".
const char *UniformColor()
{
    return R"(uniform mediump vec4 u_color;
void main(void)
{
    gl_FragColor = u_color;
})";
}

// A shader that fills with 100% opaque red.
const char *Red()
{
    return R"(precision mediump float;

void main()
{
    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
})";
}

// A shader that fills with 100% opaque blue.
const char *Blue()
{
    return R"(precision mediump float;

void main()
{
    gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);
})";
}

}  // namespace fs
}  // namespace essl1_shaders

namespace essl3_shaders
{

const char *PositionAttrib()
{
    return "a_position";
}

namespace vs
{

// A shader that sets gl_Position to zero.
const char *Zero()
{
    return R"(#version 300 es
void main()
{
    gl_Position = vec4(0);
})";
}

// A shader that sets gl_Position to attribute a_position.
const char *Simple()
{
    return R"(#version 300 es
in vec4 a_position;
void main()
{
    gl_Position = a_position;
})";
}

}  // namespace vs

namespace fs
{

// A shader that fills with 100% opaque red.
const char *Red()
{
    return R"(#version 300 es
precision highp float;
out vec4 my_FragColor;
void main()
{
    my_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
})";
}

}  // namespace fs
}  // namespace essl3_shaders

namespace essl31_shaders
{

const char *PositionAttrib()
{
    return "a_position";
}

namespace vs
{

// A shader that sets gl_Position to zero.
const char *Zero()
{
    return R"(#version 310 es
void main()
{
    gl_Position = vec4(0);
})";
}

// A shader that sets gl_Position to attribute a_position.
const char *Simple()
{
    return R"(#version 310 es
in vec4 a_position;
void main()
{
    gl_Position = a_position;
})";
}

}  // namespace vs

namespace fs
{

// A shader that fills with 100% opaque red.
const char *Red()
{
    return R"(#version 310 es
precision highp float;
out vec4 my_FragColor;
void main()
{
    my_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
})";
}

}  // namespace fs
}  // namespace essl31_shaders
}  // namespace angle
kc3-lang/angle/util/shader_utils.cpp

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kc3-lang/angle /util/shader_utils.cpp
