to-pixels.cc

static GLubyte* toPixels(int width, int height) {
    GLubyte bytes[width * height * 4];
    (reinterpret_cast<PFNGLREADPIXELSPROC>(eglGetProcAddress("glReadPixels")))(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, bytes);

    std::ofstream file;
    file.open("test-google-angle.ppm");
    file << "P3\n";
    file << "# gl.ppm\n";
    file << width;
    file << " ";
    file << height;
    file << "\n255\n";
    int max = width * height * 4;
    for (int i = 0; i < max; i += 4) {
      file << reinterpret_cast<const char*>(bytes[i]);
      file << " ";
      file << reinterpret_cast<const char*>(bytes[i + 1]);
      file << " ";
      file << reinterpret_cast<const char*>(bytes[i + 2]);
      file << " ";
    }
    file.close();
    return bytes;
  }