nuclear@0: #version 410 compatibility
nuclear@0: 
nuclear@2: uniform int tess_level;
nuclear@2: 
nuclear@0: in vec3 normal;
nuclear@0: in vec3 vpos;
nuclear@2: in vec2 uv;
nuclear@2: 
nuclear@0: 
nuclear@0: void main()
nuclear@0: {
nuclear@0: 	vec3 ldir = gl_LightSource[0].position.xyz - vpos;
nuclear@0: 
nuclear@0: 	vec3 n = normalize(normal);
nuclear@0: 	vec3 v = -normalize(vpos);
nuclear@0: 	vec3 l = normalize(ldir);
nuclear@0: 	vec3 h = normalize(l + v);
nuclear@0: 
nuclear@0: 	float ndotl = max(dot(n, l), 0.0);
nuclear@0: 	float ndoth = max(dot(n, h), 0.0);
nuclear@0: 
nuclear@2: 	vec3 ka = gl_FrontMaterial.ambient.xyz;
nuclear@0: 	vec3 kd = gl_FrontMaterial.diffuse.xyz;
nuclear@0: 	vec3 ks = gl_FrontMaterial.specular.xyz;
nuclear@0: 	float shin = gl_FrontMaterial.shininess;
nuclear@0: 
nuclear@0: 	vec3 diffuse = kd * ndotl * gl_LightSource[0].diffuse.xyz;
nuclear@0: 	vec3 specular = ks * pow(ndoth, shin) * gl_LightSource[0].specular.xyz;
nuclear@2: 	vec3 ambient = ka * gl_LightModel.ambient.xyz;
nuclear@2: 	vec3 color = ambient + diffuse + specular;
nuclear@0: 
nuclear@2: 	vec2 tess_uv = mod(uv * float(tess_level), 1.0);
nuclear@2: 
nuclear@2: #define STEPSZ	0.1
nuclear@2: 	float wire = smoothstep(0.0, STEPSZ, tess_uv.x) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.x);
nuclear@2: 	wire *= smoothstep(0.0, STEPSZ, tess_uv.y) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.y);
nuclear@2: 
nuclear@2: 	gl_FragColor = vec4(mix(vec3(0.0, 0.0, 0.0), color, wire), gl_FrontMaterial.diffuse.w);
nuclear@0: }