unsafe extern "C" fn filter_texture<T: GLFilterImpl>(
ptr: *mut GstGLFilter,
input: *mut GstGLMemory,
output: *mut GstGLMemory,
) -> gboolean
unsafe extern "C" fn filter_texture<T: GLFilterImpl>(
ptr: *mut GstGLFilter,
input: *mut GstGLMemory,
output: *mut GstGLMemory,
) -> gboolean