uniform float res;
uniform float first;
uniform sampler2D ztex;

varying float cosine;
varying vec2 texCoord;

void main()
{
	if( first == 0.0)
	{
		float depth = tex2D(ztex,gl_FragCoord.xy/res).a;
		if (gl_FragCoord.z < (depth + 0.000001)) discard;
	}
	gl_FragColor.rg = texCoord+0.5/512.0;
	gl_FragColor.b = cosine;
	gl_FragColor.a = gl_FragCoord.z;
}