#version 150

uniform sampler2D t0, t1, ts;
uniform float z_near, z_far;

void main(void) {
	ivec2 tc = ivec2(gl_FragCoord.xy);
	vec2 sp = qgl_FragTexture.xy;
	vec4 v0 = texelFetch(t0, tc, 0), v1 = texelFetch(t1, tc, 0), vs = texelFetch(ts, tc, 0);
	vec3 dc = v0.rgb, n = v1.xyz * 2. - vec3(1.);
	vec3 vd = vec3(0, 0, 1);
	vec3 rn = reflect(vd, n);
	float coeff = clamp(dot(vd, rn), 0, 1);
	vec3 rvs = texture(ts, sp - rn.xy/v0.w).rgb;
	qgl_FragData[0].rgb = mix(vs.rgb, rvs, coeff);
	//qgl_FragData[0].rgb = vec3(v0.w/10);
}