annotate sdr/vein.p.glsl @ 5:aab0d8ea21cd
normalmap and sortof subsurface shader
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Sun, 22 Apr 2012 06:26:08 +0300 |
| parents |
c6a6a64df6de |
| children |
2723dc026c4f |
| rev |
line source |
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1 uniform sampler2D tex_norm;
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2 uniform vec3 fog_col;
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3
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4 varying vec3 vpos, vnorm;
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5 varying vec3 ldir, vdir;
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6
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7 const float fog_dens = 0.075;
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8
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9 float fog(float dist);
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10
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11 void main()
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12 {
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13 vec3 tnorm = texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0;
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14 vec3 n = normalize(tnorm);
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15 vec3 v = normalize(vdir);
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16 vec3 l = v;//normalize(ldir);
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17 vec3 h = normalize(l + v);
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18
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19 vec3 diff = vec3(0.8, 0.25, 0.2) * (1.0 - max(dot(l, n), 0.0));
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20 vec3 spec = 0.5 * vec3(0.9, 0.4, 0.3) * pow(max(dot(h, n), 0.0), 10.0);
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21
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22 vec3 color = mix(fog_col, diff + spec, fog(vpos.z));
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23
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24 gl_FragColor = vec4(color, 1.0);
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25 }
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26
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27 #define LOG2E 1.442695
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28 float fog(float dist)
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29 {
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30 return clamp(exp2(-fog_dens * fog_dens * dist * dist * LOG2E), 0.0, 1.0);
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31 }
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