nuclear@2: #ifdef GL_ES
nuclear@2: precision mediump float;
nuclear@2: #endif
nuclear@2: 
nuclear@2: uniform sampler2D tex, tex_norm;
nuclear@2: 
nuclear@2: varying vec3 vpos, normal, tangent;
nuclear@2: varying vec4 color, tc;
nuclear@2: varying vec3 lpos;
nuclear@2: 
nuclear@2: void main()
nuclear@2: {
nuclear@2: 	vec4 fog_color = vec4(0.0, 0.0, 0.0, 1.0);
nuclear@2: 	vec3 tcol = texture2D(tex, tc.xy * vec2(1.0, -1.0)).xyz;
nuclear@2: 	vec3 tnorm = texture2D(tex_norm, tc.xy * vec2(1.0, -1.0)).xyz;
nuclear@2: 
nuclear@2: 	float fog = exp(-(0.2 * -vpos.z));
nuclear@2: 	
nuclear@2: 	vec3 ldir = lpos - vpos;
nuclear@2: 	float ldist = length(ldir);
nuclear@2: 
nuclear@2: 	/* bring the light direction to tangent space */
nuclear@2: 	vec3 norm = normalize(normal);
nuclear@2: 	vec3 tang = normalize(tangent);
nuclear@2: 	vec3 bitan = cross(norm, tang);
nuclear@2: 
nuclear@2: 	mat3 tbn_xform = mat3(tang.x, bitan.x, norm.x,
nuclear@2: 			tang.y, bitan.y, norm.y,
nuclear@2: 			tang.z, bitan.z, norm.z);
nuclear@2: 
nuclear@2: 	vec3 l = normalize(tbn_xform * ldir);
nuclear@2: 
nuclear@2: 	/* grab normal from the normalmap */
nuclear@2: 	vec3 n = normalize(tnorm * 2.0 - 1.0);
nuclear@2: 
nuclear@2: 	float diffuse = max(dot(n, l), 0.0);
nuclear@2: 
nuclear@2: 	/* blinn-phong specular */
nuclear@2: 	vec3 v = normalize(-vpos);
nuclear@2: 	vec3 h = normalize(v + l);
nuclear@2: 	float specular = pow(max(dot(n, h), 0.0), 60.0);
nuclear@2: 
nuclear@2: 	const vec3 amb = vec3(0.02, 0.02, 0.02);
nuclear@2: 
nuclear@2: 	float att = clamp(1.0 / (0.5 * (ldist * ldist)), 0.0, 1.0);
nuclear@2: 
nuclear@2: 	vec3 dif = tcol * diffuse * att;
nuclear@2: 	vec3 spec = vec3(0.6, 0.6, 0.6) * specular * att;
nuclear@2: 
nuclear@2: 	gl_FragColor = vec4(fog * (amb + dif + spec), 1.0);
nuclear@2: }