func GetCompressedTexImage(target uint32, level int32, img unsafe.Pointer) {
	syscall.Syscall(gpGetCompressedTexImage, 3, uintptr(target), uintptr(level), uintptr(img))
}
func GetCompressedTexImage(target uint32, level int32, img unsafe.Pointer) {
	syscall.Syscall(gpGetCompressedTexImage, 3, uintptr(target), uintptr(level), uintptr(img))
}
func GetCompressedTexImage ( target uint32 , level int32 , img unsafe . Pointer ) { syscall . Syscall ( gpGetCompressedTexImage , 3 , uintptr ( target ) , uintptr ( level ) , uintptr ( img ) ) }
// return a compressed texture image
return a compressed texture image