nuclear@4: uniform sampler2D tex_norm;
nuclear@5: uniform vec3 fog_col;
nuclear@4: 
nuclear@3: varying vec3 vpos, vnorm;
nuclear@3: varying vec3 ldir, vdir;
nuclear@3: 
nuclear@5: const float fog_dens = 0.075;
nuclear@5: 
nuclear@5: float fog(float dist);
nuclear@5: 
nuclear@3: void main()
nuclear@3: {
nuclear@4: 	vec3 tnorm = texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0;
nuclear@4: 	vec3 n = normalize(tnorm);
nuclear@3: 	vec3 v = normalize(vdir);
nuclear@4: 	vec3 l = v;//normalize(ldir);
nuclear@3: 	vec3 h = normalize(l + v);
nuclear@3: 
nuclear@4: 	vec3 diff = vec3(0.8, 0.25, 0.2) * (1.0 - max(dot(l, n), 0.0));
nuclear@4: 	vec3 spec = 0.5 * vec3(0.9, 0.4, 0.3) * pow(max(dot(h, n), 0.0), 10.0);
nuclear@3: 
nuclear@5: 	vec3 color = mix(fog_col, diff + spec, fog(vpos.z));
nuclear@5: 
nuclear@5: 	gl_FragColor = vec4(color, 1.0);
nuclear@3: }
nuclear@5: 
nuclear@5: #define LOG2E	1.442695
nuclear@5: float fog(float dist)
nuclear@5: {
nuclear@5: 	return clamp(exp2(-fog_dens * fog_dens * dist * dist * LOG2E), 0.0, 1.0);
nuclear@5: }