From ec86a37a4e0d0bdc6ffde9602f0ab460a93d4ee5 Mon Sep 17 00:00:00 2001 From: hunterk Date: Mon, 23 Jan 2017 16:56:16 -0600 Subject: [PATCH] add tvout-tweaks shader --- crt/shaders/tvout-tweaks.slang | 157 +++++++++++++++++++++++++++++++++ crt/tvout-tweaks.slangp | 4 + 2 files changed, 161 insertions(+) create mode 100644 crt/shaders/tvout-tweaks.slang create mode 100644 crt/tvout-tweaks.slangp diff --git a/crt/shaders/tvout-tweaks.slang b/crt/shaders/tvout-tweaks.slang new file mode 100644 index 0000000..4210c58 --- /dev/null +++ b/crt/shaders/tvout-tweaks.slang @@ -0,0 +1,157 @@ +#version 450 + +/////////////// +// TV-out tweaks +// Author: aliaspider - aliaspider@gmail.com +// License: GPLv3 +//////////////////////////////////////////////////////// + + +// this shader is meant to be used when running +// an emulator on a real CRT-TV @240p or @480i +//////////////////////////////////////////////////////// + +layout(push_constant) uniform Push +{ + vec4 SourceSize; + vec4 OriginalSize; + vec4 OutputSize; + uint FrameCount; + float TVOUT_RESOLUTION; + float TVOUT_COMPOSITE_CONNECTION; + float TVOUT_TV_COLOR_LEVELS; + float TVOUT_RESOLUTION_Y; + float TVOUT_RESOLUTION_I; + float TVOUT_RESOLUTION_Q; +} params; + +// Basic settings: + +// signal resolution +// higher = sharper +#pragma parameter TVOUT_RESOLUTION "TVOut Signal Resolution" 256.0 0.0 1024.0 32.0 // default, minimum, maximum, optional step + +// simulate a composite connection instead of RGB +#pragma parameter TVOUT_COMPOSITE_CONNECTION "TVOut Composite Enable" 0.0 0.0 1.0 1.0 + +// use TV video color range (16-235) +// instead of PC full range (0-255) +#pragma parameter TVOUT_TV_COLOR_LEVELS "TVOut TV Color Levels Enable" 0.0 0.0 1.0 1.0 +//////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////// +// Advanced settings: +// +// these values will be used instead +// if COMPOSITE_CONNECTION is defined +// to simulate different signal resolutions(bandwidth) +// for luma (Y) and chroma ( I and Q ) +// this is just an approximation +// and will only simulate the low bandwidth anspect of +// composite signal, not the crosstalk between luma and chroma +// Y = 4MHz I=1.3MHz Q=0.4MHz +#pragma parameter TVOUT_RESOLUTION_Y "TVOut Luma (Y) Resolution" 256.0 0.0 1024.0 32.0 +#pragma parameter TVOUT_RESOLUTION_I "TVOut Chroma (I) Resolution" 83.2 0.0 256.0 8.0 +#pragma parameter TVOUT_RESOLUTION_Q "TVOut Chroma (Q) Resolution" 25.6 0.0 256.0 8.0 + +// formula is MHz=resolution*15750Hz +// 15750Hz being the horizontal Frequency of NTSC +// (=262.5*60Hz) +//////////////////////////////////////////////////////// + +layout(std140, set = 0, binding = 0) uniform UBO +{ + mat4 MVP; +} global; + +mat3x3 RGB_to_YIQ = mat3x3( + 0.299,0.587,0.114, + 0.595716,-0.274453,-0.321263, + 0.211456,-0.522591, 0.311135); +mat3x3 YIQ_to_RGB = mat3x3( + 1.0,0.9563,0.6210, + 1.0,-0.2721,-0.6474, + 1.0,-1.1070, 1.7046); + +#define pi 3.14159265358 +#define a(x) abs(x) +#define d(x,b) (pi*b*min(a(x)+0.5,1.0/b)) +#define e(x,b) (pi*b*min(max(a(x)-0.5,-1.0/b),1.0/b)) +#define STU(x,b) ((d(x,b)+sin(d(x,b))-e(x,b)-sin(e(x,b)))/(2.0*pi)) +//#define X(i) (offset-(i)) +#define L(C) clamp((C -16.5/ 256.0)*256.0/(236.0-16.0),0.0,1.0) +#define LCHR(C) clamp((C -16.5/ 256.0)*256.0/(240.0-16.0),0.0,1.0) + +#define mul(a,b) (b*a) + +vec3 LEVELS(vec3 c0) +{ + if (params.TVOUT_TV_COLOR_LEVELS > 0.5) + { + if (params.TVOUT_COMPOSITE_CONNECTION > 0.5) + return vec3(L(c0.x),LCHR(c0.y),LCHR(c0.z)); + else + return L(c0); + } + else + return c0; +} + +#define GETC(c) \ + if (params.TVOUT_COMPOSITE_CONNECTION > 0.5) \ + c = mul(RGB_to_YIQ,LEVELS(texture(Source, vec2(vTexCoord.x - X*oneT,vTexCoord.y)).xyz)); \ + else \ + c = (LEVELS(texture(Source, vec2(vTexCoord.x - X*oneT,vTexCoord.y)).xyz)) + +#define VAL(tempColor) \ + if (params.TVOUT_COMPOSITE_CONNECTION > 0.5) \ + tempColor += vec3((c.x*STU(X,(params.TVOUT_RESOLUTION_Y*oneI))),(c.y*STU(X,(params.TVOUT_RESOLUTION_I*oneI))),(c.z*STU(X,(params.TVOUT_RESOLUTION_Q*oneI)))); \ + else \ + tempColor += (c*STU(X,(params.TVOUT_RESOLUTION*oneI))) + +#pragma stage vertex +layout(location = 0) in vec4 Position; +layout(location = 1) in vec2 TexCoord; +layout(location = 0) out vec2 vTexCoord; + +void main() +{ + gl_Position = global.MVP * Position; + vTexCoord = TexCoord; +} + +#pragma stage fragment +layout(location = 0) in vec2 vTexCoord; +layout(location = 0) out vec4 FragColor; +layout(set = 0, binding = 2) uniform sampler2D Source; + +void main() +{ + vec3 tempColor = vec3(0.0,0.0,0.0); + float offset = fract((vTexCoord.x * params.SourceSize.x) - 0.5); + float oneT = params.SourceSize.z; + float oneI = params.SourceSize.z; + + float X; + vec3 c; + + X = (offset-(-1)); + GETC(c); + VAL(tempColor); + + X = (offset-(0)); + GETC(c); + VAL(tempColor); + + X = (offset-(1)); + GETC(c); + VAL(tempColor); + + X = (offset-(2)); + GETC(c); + VAL(tempColor); + + if (params.TVOUT_COMPOSITE_CONNECTION > 0.5) + tempColor=mul(YIQ_to_RGB,tempColor); + FragColor = vec4(tempColor, 1.0); +} \ No newline at end of file diff --git a/crt/tvout-tweaks.slangp b/crt/tvout-tweaks.slangp new file mode 100644 index 0000000..c46cde4 --- /dev/null +++ b/crt/tvout-tweaks.slangp @@ -0,0 +1,4 @@ +shaders = 1 + +shader0 = shaders/tvout-tweaks.slang +filter_linear0 = false \ No newline at end of file