uniform sampler2D reflection;
uniform sampler2D ripple;

void main() {
 	vec3 dir = normalize(gl_TexCoord[1].xyz);
	
	// fresnel
	float k = dir.y*0.5;
	
	vec3 normal = texture2D( ripple, gl_TexCoord[2].xz).xzy - texture2D( ripple, gl_TexCoord[3].xz).xzy;
	
	vec4 texcoord = gl_TexCoord[0].xzyw;

	texcoord.xz += normal.xz;

	gl_FragColor = texture2DProj( reflection, texcoord.xzyw) * (gl_TexCoord[1].w-k) + vec4(pow(clamp(dot(normal,dir), 0.0, 1.0), 2.0));
	gl_FragColor.a = k;
}