Mercurial > repos > blastem

annotate shaders/crt.f.glsl @ 2688:b42f00a3a937 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix default target. Ensure m68k.h and z80.h are built before anything else when no dep info is available
author Michael Pavone <pavone@retrodev.com>
date Mon, 31 Mar 2025 21:06:18 -0700
parents f3cca4b3f17a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
1 /* Subtle CRT shader usable in fullscreen - Anaël Seghezzi [anael(at)maratis3d.com]
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
2 This shader is free software distributed under the terms of the GNU General Public
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
3 License version 3 or higher. This gives you the right to redistribute and/or
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
4 modify the program as long as you follow the terms of the license. See the file
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
5 COPYING for full license details.
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
6 */
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
7
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
8 #define M_PI 3.14159265358979323846
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
9
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
10 uniform sampler2D textures[2];
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
11 uniform mediump float width, height;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
12 uniform mediump vec2 texsize;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
13 varying mediump vec2 texcoord;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
14 varying mediump vec2 screencoord;
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
15
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
16
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
17 mediump float nrand(vec2 n) {
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
18 return fract(sin(dot(n.xy, vec2(12.9898, 78.233))) * 43758.5453);
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
19 }
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
20
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
21 mediump float scanline(vec2 texco)
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
22 {
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
23 return (1.0 - abs(cos(texco.y * texsize.y * M_PI)));
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
24 }
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
25
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
26 mediump vec2 sharp_coord(mediump vec2 texco, mediump vec2 dim, mediump vec2 sharpness)
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
27 {
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
28 mediump vec2 texcoif = texco * dim;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
29 mediump vec2 texcoi = floor(texcoif);
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
30 mediump vec2 mu = (texcoif - 0.5) - texcoi;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
31 mediump vec2 mub = pow(abs(mu) * 2.0, sharpness) * sign(mu) * 0.5;
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
32 return (texcoi + mub + 0.5) / dim;
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
33 }
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
34
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
35 void main()
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
36 {
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
37 mediump float v = 1.0 / texsize.y;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
38 mediump float yforce = 0.175;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
39 mediump float vign = length(screencoord);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
40
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
41 // monitor deformation
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
42 mediump vec2 monitorcoord = (screencoord + screencoord * vign * 0.025);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
43
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
44 if (monitorcoord.x < -1.0 || monitorcoord.y < -1.0 || monitorcoord.x > 1.0 || monitorcoord.y > 1.0) {
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
45 gl_FragColor = vec4(0.0);
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
46 return;
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
47 }
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
48
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
49 mediump vec2 texco = monitorcoord * vec2(0.5*width/texsize.x, -0.5 * height/texsize.y) + vec2(0.5*width/texsize.x, 0.5*height/texsize.y);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
50
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
51 // mask
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
52 mediump float maskx = 1.0 - pow(abs(monitorcoord.x), 200.0);
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
53 mediump float masky = 1.0 - pow(abs(-monitorcoord.y), 200.0);
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
54 mediump float mask = clamp(maskx * masky, 0.0, 1.0);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
55
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
56 // sharp texcoord
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
57 mediump vec2 texco_sharp0 = sharp_coord(texco, texsize, vec2(4.0, 8.0));
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
58 mediump vec2 texco_sharp1 = sharp_coord(texco - vec2(0.0, 0.5 / texsize.y), texsize, vec2(4.0, 8.0));
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
59
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
60 mediump vec4 src0 = texture2D(textures[0], texco_sharp0);
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
61 mediump vec4 src1 = texture2D(textures[1], texco_sharp1);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
62
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
63 // interlace mix
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
64 mediump float interlace = cos((texco.y * 2.0 * texsize.y) * M_PI);
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
65 mediump vec4 src_mix = mix(src0, src1, interlace * 0.5 + 0.5);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
66
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
67 // blur
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
68 mediump vec4 src_blur = mix(texture2D(textures[0], texco), texture2D(textures[1], texco), 0.5);
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
69
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
70 #ifdef NO_SCANLINE
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
71
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
72 gl_FragColor = (src_mix * 0.95 + (src_blur * (1.6 - vign * 0.4) * 0.1)) * mask;
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
73
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
74 #else
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
75 // multisample scanline with grain
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
76 // TODO: offset grain with time (needs a "frame" uniform)
1977
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
77 mediump float cosy;
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
78 cosy = scanline(texco + vec2(0.125, v * (nrand(texcoord + vec2(0.0, 512.0/texsize.y)) * 0.25) + 512.0*0.3333/texsize.y));
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
79 cosy += scanline(texco + vec2(0.25, v * (nrand(texcoord + vec2(0.0, 1024.0/texsize.y)) * 0.25) + 512.0*0.25/texsize.y));
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
80 cosy += scanline(texco + vec2(0.50, v * (nrand(texcoord + vec2(0.0, 1536.0/texsize.y)) * 0.25) + 512.0*0.6666/texsize.y));
f3cca4b3f17a Allow use of NPOT textures as a config option. Useful for some mobile GPUs
Michael Pavone <pavone@retrodev.com>
parents: 1439
diff changeset
81 cosy += scanline(texco + vec2(0.75, v * (nrand(texcoord + vec2(0.0, 2048.0/texsize.y)) * 0.25) + 512.0*0.75/texsize.y));
1392
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
82 cosy *= 0.25;
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
83
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
84 // final scanline + burn
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
85 gl_FragColor = ((src_mix * ((1.0 - yforce) + cosy * yforce)) + (src_blur * (1.6 - vign * 0.4) * 0.1)) * mask;
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
86
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
87 #endif
4942da159194 Added a "subtle" CRT shader contributed by Anael Seghezzi
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
88 }