annotate sdr/dither.p.glsl @ 5:e09cbb2e9d4f
metaballs
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Mon, 18 Feb 2013 03:46:52 +0200 |
| parents |
c45c7a1f7d9d |
| children |
5f99c4c7a9fe |
| rev |
line source |
|
nuclear@0
|
1 uniform sampler2D framebuf, dither_tex;
|
|
nuclear@0
|
2 uniform int dither_levels, dither_size;
|
|
nuclear@0
|
3
|
|
nuclear@0
|
4 void main()
|
|
nuclear@0
|
5 {
|
|
nuclear@0
|
6 float levels = float(dither_levels);
|
|
nuclear@0
|
7
|
|
nuclear@0
|
8 vec4 pixel = texture2D(framebuf, gl_TexCoord[0].xy);
|
|
nuclear@0
|
9 float lum = dot(pixel.xyz, vec3(0.2126, 0.7152, 0.0722));
|
|
nuclear@0
|
10 float coord_shift = floor(lum * levels) / levels;
|
|
nuclear@0
|
11
|
|
nuclear@0
|
12 vec2 dsz2 = vec2(float(dither_size), float(dither_size));
|
|
nuclear@0
|
13
|
|
nuclear@0
|
14 vec2 coord = mod(gl_FragCoord.xy, dsz2) / float(dither_size);
|
|
nuclear@0
|
15 coord.y = coord.y / levels + coord_shift;
|
|
nuclear@0
|
16 float val = texture2D(dither_tex, coord).x;
|
|
nuclear@0
|
17
|
|
nuclear@0
|
18 const vec3 dark_col = vec3(0.043, 0.286, 0.337);
|
|
nuclear@0
|
19 const vec3 bright_col = vec3(0.965, 0.778, 0.555);
|
|
nuclear@0
|
20
|
|
nuclear@0
|
21 gl_FragColor = vec4(mix(dark_col, bright_col, val), 1.0);
|
|
nuclear@0
|
22 }
|
