internal/graphicsdriver/opengl/gl/package_notwindows.go
func GetTexImage(target uint32, level int32, format uint32, xtype uint32, pixels unsafe.Pointer) {
	C.glowGetTexImage(gpGetTexImage, (C.GLenum)(target), (C.GLint)(level), (C.GLenum)(format), (C.GLenum)(xtype), pixels)
}
func GetTexImage(target uint32, level int32, format uint32, xtype uint32, pixels unsafe.Pointer) {
	C.glowGetTexImage(gpGetTexImage, (C.GLenum)(target), (C.GLint)(level), (C.GLenum)(format), (C.GLenum)(xtype), pixels)
}
// return a texture image