int sys_glWidth = 480;
  int sys_glHeight = 320;

  unsigned char *buffer;

  buffer = (unsigned char *)malloc(sys_glWidth*sys_glHeight*3);

  glReadPixels (0, 0, sys_glWidth, sys_glHeight, GL_RGB, GL_UNSIGNED_BYTE, buffer);

  glBindTexture(GL_TEXTURE_2D, transitionTexture);
  glTexImage2D(GL_TEXTURE_2D, 0, 3, sys_glWidth, sys_glHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer);

  free(buffer);