func GetTextureSubImage(texture uint32, level int32, xoffset int32, yoffset int32, zoffset int32, width int32, height int32, depth int32, format uint32, xtype uint32, bufSize int32, pixels unsafe.Pointer) {
	syscall.Syscall12(gpGetTextureSubImage, 12, uintptr(texture), uintptr(level), uintptr(xoffset), uintptr(yoffset), uintptr(zoffset), uintptr(width), uintptr(height), uintptr(depth), uintptr(format), uintptr(xtype), uintptr(bufSize), uintptr(pixels))
}
func GetTextureSubImage(texture uint32, level int32, xoffset int32, yoffset int32, zoffset int32, width int32, height int32, depth int32, format uint32, xtype uint32, bufSize int32, pixels unsafe.Pointer) {
	syscall.Syscall12(gpGetTextureSubImage, 12, uintptr(texture), uintptr(level), uintptr(xoffset), uintptr(yoffset), uintptr(zoffset), uintptr(width), uintptr(height), uintptr(depth), uintptr(format), uintptr(xtype), uintptr(bufSize), uintptr(pixels))
}
// retrieve a sub-region of a texture image from a texture     object