code: func GetTextureImage(texture uint32, level int32, format uint32, xtype uint32, bufSize int32, pixels unsafe.Pointer) {
  	syscall.Syscall6(gpGetTextureImage, 6, uintptr(texture), uintptr(level), uintptr(format), uintptr(xtype), uintptr(bufSize), uintptr(pixels))
  }
docs: // return a texture image