nuclear@10: #version 120
nuclear@10: 
nuclear@4: uniform sampler3D vol_tex;
nuclear@4: uniform sampler1D xfer_tex;
nuclear@4: 
nuclear@10: uniform vec3 light_dir[3] = vec3[3](
nuclear@9: 	vec3(0.5, 0.5, 1.0),
nuclear@9: 	vec3(-1.0, 0.2, 0.5),
nuclear@9: 	vec3(-0.2, 0.0, -7.0)
nuclear@10: );
nuclear@10: uniform vec3 light_color[3] = vec3[3](
nuclear@9: 	vec3(0.9, 0.7, 0.68),
nuclear@9: 	vec3(0.5, 0.6, 0.9),
nuclear@9: 	vec3(0.3, 0.3, 0.3)
nuclear@10: );	
nuclear@9: 
nuclear@9: const vec3 ambient = vec3(0.1, 0.1, 0.1);
nuclear@9: const vec3 vdir = vec3(0.0, 0.0, 1.0);
nuclear@9: const float dimmer = 0.7;
nuclear@9: 
nuclear@4: void main()
nuclear@4: {
nuclear@8: 	vec3 tc = gl_TexCoord[0].xyz;
nuclear@8: 	float max_manh_dist = max(tc.x, max(tc.y, tc.z));
nuclear@8: 	float min_manh_dist = min(tc.x, min(tc.y, tc.z));
nuclear@8: 	float border = step(0.0, min_manh_dist) * (1.0 - step(1.0, max_manh_dist));
nuclear@8: 
nuclear@4: 	vec4 voxel = texture3D(vol_tex, gl_TexCoord[0].xyz);
nuclear@4: 	vec4 color = texture1D(xfer_tex, voxel.a);
nuclear@4: 
nuclear@8: 	float alpha = color.a * border;
nuclear@8: 	if(alpha < 0.001) discard;
nuclear@8: 
nuclear@9: 	vec3 norm = normalize(voxel.rgb * 2.0 - 1.0);
nuclear@9: 
nuclear@9: 	vec3 diffuse = vec3(0.0, 0.0, 0.0);
nuclear@9: 	vec3 specular = vec3(0.0, 0.0, 0.0);
nuclear@9: 
nuclear@9: 	for(int i=0; i<3; i++) {
nuclear@9: 		vec3 ldir = normalize(light_dir[i]);
nuclear@9: 		vec3 hdir = normalize(vdir + ldir);
nuclear@9: 
nuclear@9: 		float ndotl = max(dot(norm, ldir), 0.0);
nuclear@9: 		float ndoth = max(dot(norm, hdir), 0.0);
nuclear@9: 
nuclear@9: 		diffuse += light_color[i] * color.rgb * ndotl;
nuclear@9: 		specular += light_color[i] * vec3(0.6, 0.6, 0.6) * pow(ndoth, 50.0);
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	gl_FragColor.rgb = ambient + (diffuse + specular) * dimmer;
nuclear@8: 	gl_FragColor.a = alpha;
nuclear@4: }