mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-10-24 08:05:42 +00:00
91962508fe
* Fix crt-cyclon and update others - Fix some crt-cyclon parameters; - Update bicubic and lanczos3. * Update crt-geom.fx and geom.fx - Added image center X and Y to crt-geom.fx and geom.fx.
392 lines
11 KiB
HLSL
392 lines
11 KiB
HLSL
#include "ReShade.fxh"
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/*
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Geom Shader - a modified CRT-Geom without CRT features made to be appended/integrated
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into any other shaders and provide curvature/warping/oversampling features.
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Adapted by Hyllian (2024).
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*/
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/*
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CRT-interlaced
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Copyright (C) 2010-2012 cgwg, Themaister and DOLLS
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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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(cgwg gave their consent to have the original version of this shader
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distributed under the GPL in this message:
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http://board.byuu.org/viewtopic.php?p=26075#p26075
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"Feel free to distribute my shaders under the GPL. After all, the
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barrel distortion code was taken from the Curvature shader, which is
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under the GPL."
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)
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This shader variant is pre-configured with screen curvature
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*/
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uniform bool geom_curvature <
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ui_type = "radio";
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ui_label = "Geom Curvature Toggle";
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> = 1.0;
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uniform float geom_R <
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ui_type = "drag";
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ui_min = 0.1;
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ui_max = 10.0;
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ui_step = 0.1;
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ui_label = "Geom Curvature Radius";
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> = 2.0;
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uniform float geom_d <
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ui_type = "drag";
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ui_min = 0.1;
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ui_max = 3.0;
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ui_step = 0.1;
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ui_label = "Geom Distance";
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> = 1.5;
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uniform bool geom_invert_aspect <
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ui_type = "radio";
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ui_label = "Geom Curvature Aspect Inversion";
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> = 0.0;
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uniform float geom_cornersize <
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ui_type = "drag";
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ui_min = 0.001;
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ui_max = 1.0;
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ui_step = 0.005;
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ui_label = "Geom Corner Size";
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> = 0.03;
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uniform float geom_cornersmooth <
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ui_type = "drag";
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ui_min = 80.0;
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ui_max = 2000.0;
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ui_step = 100.0;
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ui_label = "Geom Corner Smoothness";
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> = 1000.0;
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uniform float geom_x_tilt <
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ui_type = "drag";
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ui_min = -0.5;
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ui_max = 0.5;
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ui_step = 0.05;
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ui_label = "Geom Horizontal Tilt";
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> = 0.0;
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uniform float geom_y_tilt <
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ui_type = "drag";
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ui_min = -0.5;
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ui_max = 0.5;
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ui_step = 0.05;
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ui_label = "Geom Vertical Tilt";
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> = 0.0;
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uniform float geom_overscan_x <
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ui_type = "drag";
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ui_min = -125.0;
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ui_max = 125.0;
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ui_step = 0.5;
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ui_label = "Geom Horiz. Overscan %";
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> = 100.0;
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uniform float geom_overscan_y <
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ui_type = "drag";
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ui_min = -125.0;
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ui_max = 125.0;
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ui_step = 0.5;
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ui_label = "Geom Vert. Overscan %";
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> = 100.0;
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uniform float centerx <
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ui_type = "drag";
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ui_min = -9.99;
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ui_max = 9.99;
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ui_step = 0.01;
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ui_label = "Image Center X";
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> = 0.00;
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uniform float centery <
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ui_type = "drag";
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ui_min = -9.99;
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ui_max = 9.99;
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ui_step = 0.01;
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ui_label = "Image Center Y";
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> = 0.00;
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uniform float geom_lum <
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ui_type = "drag";
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ui_min = 0.5;
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ui_max = 2.0;
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ui_step = 0.01;
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ui_label = "Geom Luminance";
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> = 1.0;
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uniform float geom_target_gamma <
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ui_type = "drag";
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ui_min = 0.1;
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ui_max = 5.0;
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ui_step = 0.1;
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ui_label = "Geom Target Gamma";
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> = 2.4;
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uniform float geom_monitor_gamma <
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ui_type = "drag";
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ui_min = 0.1;
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ui_max = 5.0;
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ui_step = 0.1;
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ui_label = "Geom Monitor Gamma";
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> = 2.2;
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uniform float2 BufferViewportRatio < source = "buffer_to_viewport_ratio"; >;
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uniform float2 NormalizedNativePixelSize < source = "normalized_native_pixel_size"; >;
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uniform float2 ViewportSize < source = "viewportsize"; >;
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sampler2D sBackBuffer{Texture=ReShade::BackBufferTex;AddressU=BORDER;AddressV=BORDER;AddressW=BORDER;MagFilter=LINEAR;MinFilter=LINEAR;};
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// Comment the next line to disable interpolation in linear gamma (and
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// gain speed).
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#define LINEAR_PROCESSING
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// Enable 3x oversampling of the beam profile; improves moire effect caused by scanlines+curvature
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#define OVERSAMPLE
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// Use the older, purely gaussian beam profile; uncomment for speed
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//#define USEGAUSSIAN
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// Macros.
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#define FIX(c) max(abs(c), 1e-5);
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#define PI 3.141592653589
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#ifdef LINEAR_PROCESSING
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# define TEX2D(c) pow(tex2D(sBackBuffer, (c)), float4(geom_target_gamma,geom_target_gamma,geom_target_gamma,geom_target_gamma))
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#else
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# define TEX2D(c) tex2D(sBackBuffer, (c))
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#endif
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// aspect ratio
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#define aspect (geom_invert_aspect==true?float2(0.75,1.0):float2(1.0,0.75))
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#define overscan (float2(1.01,1.01));
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struct ST_VertexOut
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{
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float2 sinangle : TEXCOORD1;
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float2 cosangle : TEXCOORD2;
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float3 stretch : TEXCOORD3;
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float2 TextureSize : TEXCOORD4;
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};
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float vs_intersect(float2 xy, float2 sinangle, float2 cosangle)
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{
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float A = dot(xy,xy) + geom_d*geom_d;
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float B = 2.0*(geom_R*(dot(xy,sinangle)-geom_d*cosangle.x*cosangle.y)-geom_d*geom_d);
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float C = geom_d*geom_d + 2.0*geom_R*geom_d*cosangle.x*cosangle.y;
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return (-B-sqrt(B*B-4.0*A*C))/(2.0*A);
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}
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float2 vs_bkwtrans(float2 xy, float2 sinangle, float2 cosangle)
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{
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float c = vs_intersect(xy, sinangle, cosangle);
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float2 point = (float2(c, c)*xy - float2(-geom_R, -geom_R)*sinangle) / float2(geom_R, geom_R);
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float2 poc = point/cosangle;
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float2 tang = sinangle/cosangle;
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float A = dot(tang, tang) + 1.0;
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float B = -2.0*dot(poc, tang);
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float C = dot(poc, poc) - 1.0;
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float a = (-B + sqrt(B*B - 4.0*A*C))/(2.0*A);
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float2 uv = (point - a*sinangle)/cosangle;
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float r = FIX(geom_R*acos(a));
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return uv*r/sin(r/geom_R);
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}
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float2 vs_fwtrans(float2 uv, float2 sinangle, float2 cosangle)
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{
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float r = FIX(sqrt(dot(uv,uv)));
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uv *= sin(r/geom_R)/r;
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float x = 1.0-cos(r/geom_R);
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float D = geom_d/geom_R + x*cosangle.x*cosangle.y+dot(uv,sinangle);
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return geom_d*(uv*cosangle-x*sinangle)/D;
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}
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float3 vs_maxscale(float2 sinangle, float2 cosangle)
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{
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float2 c = vs_bkwtrans(-geom_R * sinangle / (1.0 + geom_R/geom_d*cosangle.x*cosangle.y), sinangle, cosangle);
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float2 a = float2(0.5,0.5)*aspect;
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float2 lo = float2(vs_fwtrans(float2(-a.x, c.y), sinangle, cosangle).x,
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vs_fwtrans(float2( c.x, -a.y), sinangle, cosangle).y)/aspect;
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float2 hi = float2(vs_fwtrans(float2(+a.x, c.y), sinangle, cosangle).x,
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vs_fwtrans(float2( c.x, +a.y), sinangle, cosangle).y)/aspect;
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return float3((hi+lo)*aspect*0.5,max(hi.x-lo.x,hi.y-lo.y));
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}
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// Code snippet borrowed from crt-cyclon. (credits to DariusG)
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float2 Warp(float2 pos)
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{
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pos = pos*2.0 - 1.0;
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pos *= float2(1.0 + pos.y*pos.y*0, 1.0 + pos.x*pos.x*0);
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pos = pos*0.5 + 0.5;
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return pos;
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}
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// Vertex shader generating a triangle covering the entire screen
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void VS_CRT_Geom(in uint id : SV_VertexID, out float4 position : SV_Position, out float2 texcoord : TEXCOORD, out ST_VertexOut vVARS)
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{
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texcoord.x = (id == 2) ? 2.0 : 0.0;
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texcoord.y = (id == 1) ? 2.0 : 0.0;
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position = float4(texcoord * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
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// center screen
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texcoord = Warp(texcoord - float2(centerx,centery)/100.0);
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// float2 SourceSize = 1.0/NormalizedNativePixelSize;
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float2 SourceSize = ViewportSize*BufferViewportRatio;
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// Precalculate a bunch of useful values we'll need in the fragment
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// shader.
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vVARS.sinangle = sin(float2(geom_x_tilt, geom_y_tilt));
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vVARS.cosangle = cos(float2(geom_x_tilt, geom_y_tilt));
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vVARS.stretch = vs_maxscale(vVARS.sinangle, vVARS.cosangle);
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vVARS.TextureSize = float2(SourceSize.x, SourceSize.y);
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}
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float intersect(float2 xy, float2 sinangle, float2 cosangle)
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{
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float A = dot(xy,xy) + geom_d*geom_d;
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float B, C;
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B = 2.0*(geom_R*(dot(xy,sinangle) - geom_d*cosangle.x*cosangle.y) - geom_d*geom_d);
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C = geom_d*geom_d + 2.0*geom_R*geom_d*cosangle.x*cosangle.y;
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return (-B-sqrt(B*B - 4.0*A*C))/(2.0*A);
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}
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float2 bkwtrans(float2 xy, float2 sinangle, float2 cosangle)
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{
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float c = intersect(xy, sinangle, cosangle);
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float2 point = (float2(c, c)*xy - float2(-geom_R, -geom_R)*sinangle) / float2(geom_R, geom_R);
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float2 poc = point/cosangle;
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float2 tang = sinangle/cosangle;
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float A = dot(tang, tang) + 1.0;
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float B = -2.0*dot(poc, tang);
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float C = dot(poc, poc) - 1.0;
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float a = (-B + sqrt(B*B - 4.0*A*C)) / (2.0*A);
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float2 uv = (point - a*sinangle) / cosangle;
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float r = FIX(geom_R*acos(a));
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return uv*r/sin(r/geom_R);
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}
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float2 fwtrans(float2 uv, float2 sinangle, float2 cosangle)
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{
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float r = FIX(sqrt(dot(uv, uv)));
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uv *= sin(r/geom_R)/r;
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float x = 1.0 - cos(r/geom_R);
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float D;
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D = geom_d/geom_R + x*cosangle.x*cosangle.y + dot(uv,sinangle);
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return geom_d*(uv*cosangle - x*sinangle)/D;
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}
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float3 maxscale(float2 sinangle, float2 cosangle)
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{
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float2 c = bkwtrans(-geom_R * sinangle / (1.0 + geom_R/geom_d*cosangle.x*cosangle.y), sinangle, cosangle);
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float2 a = float2(0.5, 0.5)*aspect;
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float2 lo = float2(fwtrans(float2(-a.x, c.y), sinangle, cosangle).x,
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fwtrans(float2( c.x, -a.y), sinangle, cosangle).y)/aspect;
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float2 hi = float2(fwtrans(float2(+a.x, c.y), sinangle, cosangle).x,
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fwtrans(float2( c.x, +a.y), sinangle, cosangle).y)/aspect;
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return float3((hi+lo)*aspect*0.5,max(hi.x-lo.x, hi.y-lo.y));
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}
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float2 transform(float2 coord, float2 sinangle, float2 cosangle, float3 stretch)
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{
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coord = (coord - float2(0.5, 0.5))*aspect*stretch.z + stretch.xy;
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return (bkwtrans(coord, sinangle, cosangle) /
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float2(geom_overscan_x / 100.0, geom_overscan_y / 100.0)/aspect + float2(0.5, 0.5));
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}
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float corner(float2 coord)
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{
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coord = (coord - float2(0.5, 0.5)) * float2(geom_overscan_x / 100.0, geom_overscan_y / 100.0) + float2(0.5, 0.5);
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coord = min(coord, float2(1.0, 1.0) - coord) * aspect;
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float2 cdist = float2(geom_cornersize, geom_cornersize);
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coord = (cdist - min(coord, cdist));
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float dist = sqrt(dot(coord, coord));
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return clamp((cdist.x - dist)*geom_cornersmooth, 0.0, 1.0);
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}
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float fwidth(float value){
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return abs(ddx(value)) + abs(ddy(value));
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}
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float4 PS_CRT_Geom(float4 vpos: SV_Position, float2 vTexCoord : TEXCOORD, in ST_VertexOut vVARS) : SV_Target
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{
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// Texture coordinates of the texel containing the active pixel.
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float2 xy;
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if (geom_curvature == true)
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xy = transform(vTexCoord, vVARS.sinangle, vVARS.cosangle, vVARS.stretch);
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else
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xy = vTexCoord;
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float cval = corner(xy);
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float2 uv_ratio = frac((xy * vVARS.TextureSize - float2(0.5, 0.5)) / vVARS.TextureSize);
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float4 col = TEX2D(xy);
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#ifndef LINEAR_PROCESSING
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col = pow(col , float4(geom_target_gamma, geom_target_gamma, geom_target_gamma, geom_target_gamma));
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#endif
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col.rgb *= (geom_lum * step(0.0, uv_ratio.y));
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float3 mul_res = col.rgb * float3(cval, cval, cval);
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// Convert the image gamma for display on our output device.
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mul_res = pow(mul_res, float3(1.0 / geom_monitor_gamma, 1.0 / geom_monitor_gamma, 1.0 / geom_monitor_gamma));
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return float4(mul_res, 1.0);
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}
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technique CRT_Geom
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{
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pass
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{
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VertexShader = VS_CRT_Geom;
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PixelShader = PS_CRT_Geom;
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}
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}
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