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https://github.com/italicsjenga/slang-shaders.git
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113 lines
3.6 KiB
Plaintext
113 lines
3.6 KiB
Plaintext
#version 450
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/*
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zfast_crt - A very simple CRT shader.
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Copyright (C) 2017 Greg Hogan (SoltanGris42)
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edited by metallic 77.
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ported to slang by gregoricavichioli & hunterk.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your option)
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any later version.
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*/
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layout(push_constant) uniform Push
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{
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vec4 SourceSize;
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vec4 OriginalSize;
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vec4 OutputSize;
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uint FrameCount;
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float pi, blurx, blury, HIGHSCANAMOUNT1, HIGHSCANAMOUNT2, MASK_DARK, MASK_FADE, sat, FLICK;
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} params;
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#pragma parameter blurx "Convergence X-Axis" 0.45 -1.0 2.0 0.05
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#pragma parameter blury "Convergence Y-Axis" -0.25 -1.0 1.0 0.05
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#pragma parameter HIGHSCANAMOUNT1 "Scanline Amount (Low)" 0.4 0.0 1.0 0.05
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#pragma parameter HIGHSCANAMOUNT2 "Scanline Amount (High)" 0.3 0.0 1.0 0.05
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#pragma parameter MASK_DARK "Mask Effect Amount" 0.3 0.0 1.0 0.05
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#pragma parameter MASK_FADE "Mask/Scanline Fade" 0.7 0.0 1.0 0.05
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#pragma parameter sat "Saturation" 1.0 0.0 3.0 0.05
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#pragma parameter FLICK "Flicker" 10.0 0.0 50.0 1.0
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#define pi 3.14159
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#define blurx params.blurx
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#define blury params.blury
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#define HIGHSCANAMOUNT1 params.HIGHSCANAMOUNT1
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#define HIGHSCANAMOUNT2 params.HIGHSCANAMOUNT2
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#define BRIGHTBOOST params.BRIGHTBOOST
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#define MASK_DARK params.MASK_DARK
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#define MASK_FADE params.MASK_FADE
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#define sat params.sat
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#define FLICK params.FLICK
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#define SourceSize params.SourceSize
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#define OriginalSize params.OriginalSize
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#define OutputSize params.OutputSize
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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} global;
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 vTexCoord;
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layout(location = 1) out float maskFade;
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = TexCoord*1.0001;
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maskFade = 0.3333*MASK_FADE;
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}
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#pragma stage fragment
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layout(location = 0) in vec2 vTexCoord;
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layout(location = 1) in float maskFade;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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#define blur_y blury/(SourceSize.y*2.0)
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#define blur_x blurx/(SourceSize.x*2.0)
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#define iTimer (float(params.FrameCount)*2.0)
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#define flicker FLICK/1000.0
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void main()
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{
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vec2 pos = vTexCoord;
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float cent = floor(vTexCoord.y*SourceSize.y)+0.5;
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float ycoord = cent*SourceSize.w;
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pos = vec2(vTexCoord.x,ycoord);
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vec3 sample1 = sin(iTimer)*flicker + texture(Source,vec2(pos.x + blur_x, pos.y - blur_y)).rgb;
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vec3 sample2 = 0.5*texture(Source,pos).rgb;
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vec3 sample3 = sin(iTimer)*flicker + texture(Source,vec2(pos.x - blur_x, pos.y + blur_y)).rgb;
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vec3 colour = vec3 (sample1.r*0.5 + sample2.r,
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sample1.g*0.25 + sample2.g + sample3.g*0.25,
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sample2.b + sample3.b*0.5);
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vec3 lumweight=vec3(0.22,0.71,0.07);
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float lum = dot(colour,lumweight);
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vec3 graycolour = vec3(lum);
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colour = vec3(mix(graycolour,colour.rgb,sat));
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float SCANAMOUNT = mix(HIGHSCANAMOUNT1,HIGHSCANAMOUNT2,max(max(colour.r,colour.g),colour.b));
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float scanLine = SCANAMOUNT * sin(fract(vTexCoord.y*SourceSize.y)*3.14159)+1.0-SCANAMOUNT;
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if (OriginalSize.y > 400.0) scanLine = 1.0;
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float whichmask = fract(vTexCoord.x*OutputSize.x*0.4999);
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float mask = 1.0 + float(whichmask < 0.5) * -MASK_DARK;
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colour *= colour;
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colour.rgb *= mix(mask*scanLine, scanLine, dot(colour.rgb,vec3(maskFade)));
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colour = sqrt(colour);
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FragColor.rgb = colour.rgb;
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}
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