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annotate shaders/crt.f.glsl @ 1483:001120e91fed nuklear_ui

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Skip loading menu ROM if Nuklear UI is enabled. Allow disabling Nuklear UI in favor of old menu ROM both at compile time and in config. Fall back to ROM UI if GL is unavailable
author Michael Pavone <pavone@retrodev.com>
date Sat, 25 Nov 2017 20:43:20 -0800
parents 7da675d0c512
children f3cca4b3f17a
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1392
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1 #version 110
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2
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3 /* Subtle CRT shader usable in fullscreen - Anaël Seghezzi [anael(at)maratis3d.com]
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4 This shader is free software distributed under the terms of the GNU General Public
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5 License version 3 or higher. This gives you the right to redistribute and/or
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6 modify the program as long as you follow the terms of the license. See the file
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7 COPYING for full license details.
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8 */
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9
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10 #define M_PI 3.14159265358979323846
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11
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12 uniform sampler2D textures[2];
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13 uniform float width, height;
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14 varying vec2 texcoord;
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15 varying vec2 screencoord;
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16
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17
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18 float nrand(vec2 n) {
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19 return fract(sin(dot(n.xy, vec2(12.9898, 78.233))) * 43758.5453);
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20 }
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21
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22 float scanline(vec2 texco)
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23 {
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24 return (1.0 - abs(cos(texco.y * 512.0 * M_PI)));
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25 }
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26
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27 vec2 sharp_coord(vec2 texco, vec2 dim, vec2 sharpness)
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28 {
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29 vec2 texcoif = texco * dim;
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30 vec2 texcoi = floor(texcoif);
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31 vec2 mu = (texcoif - 0.5) - texcoi;
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32 vec2 mub = pow(abs(mu) * 2.0, sharpness) * sign(mu) * 0.5;
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33 return (texcoi + mub + 0.5) / dim;
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34 }
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35
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36 void main()
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37 {
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38 float v = 1.0 / 512.0;
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39 float yforce = 0.175;
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40 float vign = length(screencoord);
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41
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42 // monitor deformation
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43 vec2 monitorcoord = (screencoord + screencoord * vign * 0.025);
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44
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45 if (monitorcoord.x < -1.0 || monitorcoord.y < -1.0 || monitorcoord.x > 1.0 || monitorcoord.y > 1.0) {
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46 gl_FragColor = vec4(0.0);
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47 return;
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48 }
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49
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50 vec2 texco = monitorcoord * vec2(width/1024.0, height/-1024.0) + vec2(width/1024.0, height/1024.0);
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51
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52 // mask
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53 float maskx = 1.0 - pow(abs(monitorcoord.x), 200.0);
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54 float masky = 1.0 - pow(abs(-monitorcoord.y), 200.0);
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55 float mask = clamp(maskx * masky, 0.0, 1.0);
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56
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57 // sharp texcoord
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58 vec2 texco_sharp0 = sharp_coord(texco, vec2(512.0, 512.0), vec2(4.0, 8.0));
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59 vec2 texco_sharp1 = sharp_coord(texco - vec2(0.0, 1.0 / 1024.0), vec2(512.0, 512.0), vec2(4.0, 8.0));
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60
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61 vec4 src0 = texture2D(textures[0], texco_sharp0);
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62 vec4 src1 = texture2D(textures[1], texco_sharp1);
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63
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64 // interlace mix
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65 float interlace = cos((texco.y * 1024.0) * M_PI);
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66 vec4 src_mix = mix(src0, src1, interlace * 0.5 + 0.5);
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67
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68 // blur
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69 vec4 src_blur = mix(texture2D(textures[0], texco), texture2D(textures[1], texco), 0.5);
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70
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71 #ifdef NO_SCANLINE
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72
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73 gl_FragColor = (src_mix * 0.95 + (src_blur * (1.6 - vign * 0.4) * 0.1)) * mask;
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74
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75 #else
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76 // multisample scanline with grain
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77 // TODO: offset grain with time (needs a "frame" uniform)
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78 float cosy;
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79 cosy = scanline(texco + vec2(0.125, v * (nrand(texcoord + vec2(0.0, 1.0)) * 0.25) + 0.3333));
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80 cosy += scanline(texco + vec2(0.25, v * (nrand(texcoord + vec2(0.0, 2.0)) * 0.25) + 0.25));
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81 cosy += scanline(texco + vec2(0.50, v * (nrand(texcoord + vec2(0.0, 3.0)) * 0.25) + 0.6666));
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82 cosy += scanline(texco + vec2(0.75, v * (nrand(texcoord + vec2(0.0, 4.0)) * 0.25) + 0.75));
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83 cosy *= 0.25;
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84
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85 // final scanline + burn
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86 gl_FragColor = ((src_mix * ((1.0 - yforce) + cosy * yforce)) + (src_blur * (1.6 - vign * 0.4) * 0.1)) * mask;
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87
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88 #endif
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89 }