nuclear@41: uniform sampler2D tex_dif, tex_norm;
nuclear@41: 
nuclear@41: varying vec3 pos, norm, tang;
nuclear@41: 
nuclear@41: const float fog_start = 3.0;
nuclear@41: const float fog_end = 6.0;
nuclear@41: 
nuclear@43: const vec3 lpos = vec3(0.0, 0.0, -0.5);
nuclear@43: const vec3 vdir = vec3(0.0, 0.0, 1.0);
nuclear@43: 
nuclear@43: const vec3 lcol = vec3(1.0, 0.732, 0.437);
nuclear@43: 
nuclear@41: void main()
nuclear@41: {
nuclear@41: 	vec3 texel = texture2D(tex_dif, gl_TexCoord[0].st).xyz;
nuclear@41: 
nuclear@41: 	vec3 n = normalize(norm);
nuclear@41: 	vec3 t = normalize(tang);
nuclear@41: 	vec3 b = cross(n, t);
nuclear@41: 
nuclear@41: 	mat3 tbn_mat = mat3(
nuclear@41: 			t.x, b.x, n.x,
nuclear@41: 			t.y, b.y, n.y,
nuclear@41: 			t.z, b.z, n.z);
nuclear@41: 
nuclear@41: 	vec3 ldir = tbn_mat * normalize(lpos - pos);
nuclear@41: 	vec3 hvec = normalize(vdir + ldir);
nuclear@41: 
nuclear@41: 	n = normalize(texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0);
nuclear@41: 	float ndotl = max(dot(n, ldir), 0.0);
nuclear@41: 	float ndoth = max(dot(n, hvec), 0.0);
nuclear@41: 
nuclear@41: 	vec3 diffuse = gl_FrontMaterial.diffuse.xyz * texel * ndotl;
nuclear@41: 	vec3 specular = gl_FrontMaterial.specular.xyz * pow(ndoth, gl_FrontMaterial.shininess);
nuclear@41: 
nuclear@41: 	float fog = clamp((fog_end + pos.z) / (fog_end - fog_start), 0.0, 1.0);
nuclear@41: 
nuclear@43: 	gl_FragColor = vec4((diffuse + specular) * lcol * fog, 1.0);
nuclear@41: }