kc3-lang/angle/util/shader_utils.cpp

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• Hash : 4ed05da2
  Author :
  Date : 2018-02-02T14:26:15
  

  ES31: Add link validation on geometry shader itself
  
  This patch intends to support program link validation on geometry
  shader itself. A link error should occur when linking a program with
  a geometry shader that lacks input primitive or output primitive or
  the declaration of 'max_vertices'.
  
  This patch also adds the support of linking a program with geometry
  shader in angle_end2end_tests.
  
  BUG=angleproject:1941
  TEST=angle_end2end_tests
       dEQP-GLES31.functional.shaders.linkage.es31.geometry.varying.rules.unspecified_*
  
  Change-Id: I25fb08514753102f5dd3ab86211c05d2ca4fd185
  Reviewed-on: https://chromium-review.googlesource.com/898842
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• 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);
  }
  
  GLuint CompileProgramWithGSAndTransformFeedback(
      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 CheckLinkStatusAndReturnProgram(program, true);
  }
  
  GLuint CompileProgram(const std::string &vsSource, const std::string &fsSource)
  {
      return CompileProgramWithGS(vsSource, "", fsSource);
  }
  
  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);
  }
  

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