Method fromSources

pj_scene3D/widgets/src/gl/program.cpp:120–164

}

Program::Result Program::fromSources(std::string_view vert_src, std::string_view frag_src) {
  return withGlFunctions([vert_src, frag_src](auto& functions) -> Program::Result {
    std::string error;
    const GLuint vert_shader = compileShader(functions, GL_VERTEX_SHADER, vert_src, "Vertex", error);
    if (vert_shader == 0U) {
      return error;
    }

    const GLuint frag_shader = compileShader(functions, GL_FRAGMENT_SHADER, frag_src, "Fragment", error);
    if (frag_shader == 0U) {
      functions.glDeleteShader(vert_shader);
      return error;
    }

    const GLuint program = functions.glCreateProgram();
    if (program == 0U) {
      functions.glDeleteShader(vert_shader);
      functions.glDeleteShader(frag_shader);
      return std::string{"Failed to create shader program"};
    }

    functions.glAttachShader(program, vert_shader);
    functions.glAttachShader(program, frag_shader);
    functions.glLinkProgram(program);

    GLint link_status = GL_FALSE;
    functions.glGetProgramiv(program, GL_LINK_STATUS, &link_status);

    functions.glDetachShader(program, vert_shader);
    functions.glDetachShader(program, frag_shader);
    functions.glDeleteShader(vert_shader);
    functions.glDeleteShader(frag_shader);

    if (link_status == GL_TRUE) {
      return Program{program};
    }

    const std::string log = programInfoLog(functions, program);
    functions.glDeleteProgram(program);
    if (log.empty()) {
      return std::string{"Shader program link failed"};
    }
    return fmt::format("Shader program link failed:\n{}", log);
  });
}

Program::Result Program::fromComputeSource(std::string_view comp_src) {
  return withGlFunctions([comp_src](auto& functions) -> Program::Result {