Method loadEffectConfig

source/application/StarRenderer_opengl.cpp:217–377

}

void OpenGlRenderer::loadEffectConfig(String const& name, Json const& effectConfig, StringMap<String> const& shaders) {
  if (auto effect = m_effects.ptr(name)) {
    Logger::info("Reloading OpenGL effect {}", name);
    glDeleteProgram(effect->program);
    m_effects.erase(name);
  }

  GLint status = 0;
  char logBuffer[1024];

  auto compileShader = [&](GLenum type, String const& name) -> GLuint {
    GLuint shader = glCreateShader(type);
    auto* source = shaders.ptr(name);
    if (!source)
      return 0;
    char const* sourcePtr = source->utf8Ptr();
    glShaderSource(shader, 1, &sourcePtr, NULL);
    glCompileShader(shader);

    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
    if (!status) {
      glGetShaderInfoLog(shader, sizeof(logBuffer), NULL, logBuffer);
      throw RendererException(strf("Failed to compile {} shader: {}\n", name, logBuffer));
    }

    return shader;
  };

  GLuint vertexShader = 0, fragmentShader = 0;
  try {
    vertexShader = compileShader(GL_VERTEX_SHADER, "vertex");
    fragmentShader = compileShader(GL_FRAGMENT_SHADER, "fragment");
  }
  catch (RendererException const& e) {
    Logger::error("Shader compile error, using default: {}", e.what());
    if (vertexShader) glDeleteShader(vertexShader);
    if (fragmentShader) glDeleteShader(fragmentShader);
    vertexShader = compileShader(GL_VERTEX_SHADER, DefaultVertexShader);
    fragmentShader = compileShader(GL_FRAGMENT_SHADER, DefaultFragmentShader);
  }

  GLuint program = glCreateProgram();

  if (vertexShader)
    glAttachShader(program, vertexShader);
  if (fragmentShader)
    glAttachShader(program, fragmentShader);
  glLinkProgram(program);

  if (vertexShader)
    glDeleteShader(vertexShader);
  if (fragmentShader)
    glDeleteShader(fragmentShader);

  glGetProgramiv(program, GL_LINK_STATUS, &status);
  if (!status) {
    glGetProgramInfoLog(program, sizeof(logBuffer), NULL, logBuffer);
    glDeleteProgram(program);