kc3-lang/angle/util/shader_utils.cpp

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• Author : Jamie Madill
  Date : 2017-08-21 10:52:40
  Hash : 401345e4
  Message : D3D11: Move more state into StateManager11. This moves the input layout cache and vertex and index data managers and related info into the state manager. This makes it easier to manage the state application with regards to dirty bits. Also updates the dirty current value handling in StateManager11. BUG=angleproject:1156 BUG=angleproject:2052 Change-Id: I8de968a1f8416363aa1c49d9e9da129942d21275 Reviewed-on: https://chromium-review.googlesource.com/616783 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: 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)
  {
      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 (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 CheckLinkStatusAndReturnProgram(program, true);
  }
  
  GLuint CompileProgram(const std::string &vsSource, const std::string &fsSource)
  {
      std::vector<std::string> emptyVector;
      return CompileProgramWithTransformFeedback(vsSource, 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);
  }