JNIEXPORT int JNICALL Java_com_csnc_CSNC_render(JNIEnv * env, jobject  obj, jobject bitmap){
  mainloop();

  AndroidBitmapInfo  info;
  void* pixels;
  int ret;
  //lock pixels

  if ((ret = AndroidBitmap_getInfo(env, bitmap, &info)) < 0) {
   return 0;
  }

  if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
   return 0;
  }

  if ((ret = AndroidBitmap_lockPixels(env, bitmap, &pixels)) < 0) {
   return 0;
  }

  //copy vram
  uint32_t *cvram = (uint32_t*) pixels;

  for (register int i=0; i<SCREEN_WIDTH*SCREEN_HEIGHT; i++){
   color_t col = palette[vram[i]];
   cvram[i] = (uint32_t) (
    col.r |
    col.g << 8  |
    col.b << 16 |
    0xFF000000 );
  }

  //unlock pixels
  AndroidBitmap_unlockPixels(env, bitmap);

  return 1;
 }