SFML/samples/bin/datas/post-fx/wave.sfx

texture framebuffer
texture wave
vec2 offset

effect
{
	vec2 texoffset = wave(_in * offset).xy;
	texoffset -= vec2(0.5, 0.5);
	texoffset *= 0.05;

	_out = framebuffer(_in + texoffset);
}