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1 #version 410 compatibility
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2
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3 uniform int tess_level;
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4
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5 in vec3 normal;
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6 in vec3 vpos;
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7 in vec2 uv;
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8
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9
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10 void main()
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11 {
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12 vec3 ldir = gl_LightSource[0].position.xyz - vpos;
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13
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14 vec3 n = normalize(normal);
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15 vec3 v = -normalize(vpos);
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16 vec3 l = normalize(ldir);
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17 vec3 h = normalize(l + v);
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18
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19 float ndotl = max(dot(n, l), 0.0);
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20 float ndoth = max(dot(n, h), 0.0);
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21
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22 vec3 ka = gl_FrontMaterial.ambient.xyz;
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23 vec3 kd = gl_FrontMaterial.diffuse.xyz;
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24 vec3 ks = gl_FrontMaterial.specular.xyz;
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25 float shin = gl_FrontMaterial.shininess;
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26
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27 vec3 diffuse = kd * ndotl * gl_LightSource[0].diffuse.xyz;
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28 vec3 specular = ks * pow(ndoth, shin) * gl_LightSource[0].specular.xyz;
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29 vec3 ambient = ka * gl_LightModel.ambient.xyz;
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30 vec3 color = ambient + diffuse + specular;
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31
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32 vec2 tess_uv = mod(uv * float(tess_level), 1.0);
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33
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34 #define STEPSZ 0.1
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35 float wire = smoothstep(0.0, STEPSZ, tess_uv.x) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.x);
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36 wire *= smoothstep(0.0, STEPSZ, tess_uv.y) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.y);
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37
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38 gl_FragColor = vec4(mix(vec3(0.0, 0.0, 0.0), color, wire), gl_FrontMaterial.diffuse.w);
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39 }
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