slang-shaders/ntsc/shaders/mame-ntsc/mame-postproc.slang

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2017-07-26 06:13:42 +10:00
#version 450
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
float scanlines;
float scandark;
float deconverge;
float pincushion;
float hertzroll;
} params;
#pragma parameter scanlines "Scanline Toggle" 1.0 0.0 1.0 1.0
#pragma parameter scandark "Scanline Intensity" 0.175 0.0 1.0 0.05
#pragma parameter deconverge "Deconvergence/Convolution" 1.0 0.0 1.0 1.0
#pragma parameter pincushion "Bezel Toggle" 0.0 0.0 1.0 1.0
#pragma parameter hertzroll "Refresh Roll Toggle" 1.0 0.0 1.0 1.0
#include "constants.inc"
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
} global;
#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;
vec4 ColorConvolution(vec2 UV, vec2 InverseRes)
{
vec3 InPixel = texture(Source, UV).rgb;
// Color Matrix
float RedValue = dot(InPixel, RedMatrix);
float GrnValue = dot(InPixel, GrnMatrix);
float BluValue = dot(InPixel, BluMatrix);
vec3 OutColor = vec3(RedValue, GrnValue, BluValue);
// DC Offset & Scale
OutColor = (OutColor * ColorScale) + DCOffset;
// Saturation
float Luma = dot(OutColor, Gray);
vec3 Chroma = OutColor - Luma;
OutColor = (Chroma * Saturation) + Luma;
return vec4(OutColor, 1.0);
}
vec4 Deconverge(vec2 UV)
{
vec2 InverseRes = 1.0 / params.SourceSize.xy;
vec2 InverseSrcRes = 1.0 / params.OriginalSize.xy;
vec3 CoordX = UV.x * RadialConvergeX;
vec3 CoordY = UV.y * RadialConvergeY;
CoordX += ConvergeX * InverseRes.x - (RadialConvergeX - 1.0) * 0.5;
CoordY += ConvergeY * InverseRes.y - (RadialConvergeY - 1.0) * 0.5;
float RedValue = ColorConvolution(vec2(CoordX.x, CoordY.x), InverseSrcRes).r;
float GrnValue = ColorConvolution(vec2(CoordX.y, CoordY.y), InverseSrcRes).g;
float BluValue = ColorConvolution(vec2(CoordX.z, CoordY.z), InverseSrcRes).b;
if (params.deconverge > 0.5) return vec4(RedValue, GrnValue, BluValue, 1.0);
else return vec4(texture(Source, UV));
}
vec4 ScanlinePincushion(vec2 UV)
{
vec4 InTexel = Deconverge(UV);
vec2 PinUnitCoord = UV * Two.xy - One.xy;
float PincushionR2 = pow(length(PinUnitCoord), 2.0);
vec2 PincushionCurve = PinUnitCoord * PincushionAmount * PincushionR2;
vec2 BaseCoord = UV;
vec2 ScanCoord = UV;
BaseCoord *= One.xy - PincushionAmount * 0.2; // Warning: Magic constant
BaseCoord += PincushionAmount * 0.1;
BaseCoord += PincushionCurve;
ScanCoord *= One.xy - PincushionAmount * 0.2; // Warning: Magic constant
ScanCoord += PincushionAmount * 0.1;
ScanCoord += PincushionCurve;
vec2 CurveClipUnitCoord = UV * Two.xy - One.xy;
float CurvatureClipR2 = pow(length(CurveClipUnitCoord), 2.0);
vec2 CurvatureClipCurve = CurveClipUnitCoord * CurvatureAmount * CurvatureClipR2;
vec2 ScreenClipCoord = UV;
ScreenClipCoord -= Half.xy;
ScreenClipCoord *= One.xy - CurvatureAmount * 0.2; // Warning: Magic constant
ScreenClipCoord += Half.xy;
ScreenClipCoord += CurvatureClipCurve;
if (params.pincushion > 0.5){
// -- Alpha Clipping --
if (BaseCoord.x < 0.0) return vec4(0.0, 0.0, 0.0, 1.0);
if (BaseCoord.y < 0.0) return vec4(0.0, 0.0, 0.0, 1.0);
if (BaseCoord.x > 1.0) return vec4(0.0, 0.0, 0.0, 1.0);
if (BaseCoord.y > 1.0) return vec4(0.0, 0.0, 0.0, 1.0);
}
// -- Scanline Simulation --
float InnerSine = ScanCoord.y * params.OriginalSize.y * ScanlineScale;
float ScanBrightMod = sin(InnerSine * Pi + ScanlineOffset * params.OriginalSize.y);
float ScanBrightness = mix(1.0, (pow(ScanBrightMod * ScanBrightMod, ScanlineHeight) * ScanlineBrightScale + 1.0) * 0.5, params.scandark);
vec3 ScanlineTexel = InTexel.rgb * ScanBrightness;
// -- Color Compression (increasing the floor of the signal without affecting the ceiling) --
ScanlineTexel = Floor + (One.xyz - Floor) * ScanlineTexel;
if (params.scanlines > 0.5) return vec4(ScanlineTexel, 1.0);
else return vec4(InTexel);
}
vec4 SixtyHertz(vec2 UV)
{
vec4 InPixel = ScanlinePincushion(UV);
float Milliseconds = float(params.FrameCount) * 15.0;
float TimeStep = fract(Milliseconds * SixtyHertzRate);
float BarPosition = 1.0 - fract(UV.y + TimeStep) * SixtyHertzScale;
vec4 OutPixel = InPixel * BarPosition;
if (params.hertzroll > 0.5) return OutPixel;
else return InPixel;
}
void main()
{
vec4 OutPixel = SixtyHertz(vTexCoord.xy);
FragColor = OutPixel;
}