internal/graphicsdriver/opengl/gl/package_notwindows.go
func GetCompressedTexImage(target uint32, level int32, img unsafe.Pointer) {
	C.glowGetCompressedTexImage(gpGetCompressedTexImage, (C.GLenum)(target), (C.GLint)(level), img)
}
func GetCompressedTexImage(target uint32, level int32, img unsafe.Pointer) {
	C.glowGetCompressedTexImage(gpGetCompressedTexImage, (C.GLenum)(target), (C.GLint)(level), img)
}
// return a compressed texture image