Method fromComputeSource

pj_scene3D/widgets/src/gl/program.cpp:166–200

}

Program::Result Program::fromComputeSource(std::string_view comp_src) {
  return withGlFunctions([comp_src](auto& functions) -> Program::Result {
    std::string error;
    const GLuint comp_shader = compileShader(functions, GL_COMPUTE_SHADER, comp_src, "Compute", error);
    if (comp_shader == 0U) {
      return error;
    }

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

    functions.glAttachShader(program, comp_shader);
    functions.glLinkProgram(program);

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

    functions.glDetachShader(program, comp_shader);
    functions.glDeleteShader(comp_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{"Compute program link failed"};
    }
    return fmt::format("Compute program link failed:\n{}", log);
  });
}

void Program::use() {
  withGlFunctions([this](auto& functions) { functions.glUseProgram(id_); });