func BindTextureUnit(unit uint32, texture uint32) {
	syscall.Syscall(gpBindTextureUnit, 2, uintptr(unit), uintptr(texture), 0)
}
func BindTextureUnit(unit uint32, texture uint32) {
	syscall.Syscall(gpBindTextureUnit, 2, uintptr(unit), uintptr(texture), 0)
}
func BindTextureUnit ( unit uint32 , texture uint32 ) { syscall . Syscall ( gpBindTextureUnit , 2 , uintptr ( unit ) , uintptr ( texture ) , 0 ) }
// bind an existing texture object to the specified texture unit
bind an existing texture object to the specified texture unit