mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-11-25 00:51:29 +11:00
c10a40e656
* update shaders that use Original to use a reference pass instead for append/prepend readiness * remove some extraneous files * fix super-xbr preset that was already broken apparently
363 lines
15 KiB
Plaintext
363 lines
15 KiB
Plaintext
#version 450
|
|
|
|
/*
|
|
CRT-interlaced-halation shader - pass2
|
|
|
|
Like the CRT-interlaced shader, but adds a subtle glow around bright areas
|
|
of the screen.
|
|
|
|
Copyright (C) 2010-2012 cgwg, Themaister and DOLLS
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 2 of the License, or (at your option)
|
|
any later version.
|
|
|
|
(cgwg gave their consent to have the original version of this shader
|
|
distributed under the GPL in this message:
|
|
|
|
http://board.byuu.org/viewtopic.php?p=26075#p26075
|
|
|
|
"Feel free to distribute my shaders under the GPL. After all, the
|
|
barrel distortion code was taken from the Curvature shader, which is
|
|
under the GPL."
|
|
)
|
|
*/
|
|
|
|
layout(push_constant) uniform Push
|
|
{
|
|
vec4 SourceSize;
|
|
vec4 crt_interlaced_halation_refpassSize;
|
|
vec4 OutputSize;
|
|
uint FrameCount;
|
|
} params;
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
} global;
|
|
|
|
// Comment the next line to disable interpolation in linear gamma (and
|
|
// gain speed).
|
|
#define LINEAR_PROCESSING
|
|
|
|
// Enable screen curvature.
|
|
#define CURVATURE
|
|
|
|
// Enable 3x oversampling of the beam profile
|
|
//#define OVERSAMPLE
|
|
|
|
// Use the older, purely gaussian beam profile
|
|
#define USEGAUSSIAN
|
|
|
|
// Use interlacing detection; may interfere with other shaders if combined
|
|
#define INTERLACED
|
|
|
|
// Enable Dot-mask emulation:
|
|
// Output pixels are alternately tinted green and magenta.
|
|
//#define DOTMASK
|
|
|
|
//Enable if using several shaders.
|
|
//Disabling it reduces moire for single pass.
|
|
#define MULTIPASS
|
|
|
|
// Macros.
|
|
#define FIX(c) max(abs(c), 1e-5);
|
|
#define PI 3.141592653589
|
|
|
|
#ifdef LINEAR_PROCESSING
|
|
# define TEX2D(c) pow(texture(crt_interlaced_halation_refpass, (c)), vec4(CRTgamma))
|
|
#else
|
|
# define TEX2D(c) texture(crt_interlaced_halation_refpass, (c))
|
|
#endif
|
|
|
|
|
|
|
|
// START of parameters
|
|
|
|
// gamma of simulated CRT
|
|
float CRTgamma = 2.4;
|
|
// gamma of display monitor (typically 2.2 is correct)
|
|
float monitorgamma = 2.2;
|
|
// overscan (e.g. 1.02 for 2% overscan)
|
|
vec2 overscan = vec2(1.0,1.0);
|
|
// aspect ratio
|
|
vec2 aspect = vec2(1.0, 0.75);
|
|
// lengths are measured in units of (approximately) the width
|
|
// of the monitor simulated distance from viewer to monitor
|
|
float d = 2.0;
|
|
// radius of curvature
|
|
float R = 2.0;
|
|
// tilt angle in radians
|
|
// (behavior might be a bit wrong if both components are
|
|
// nonzero)
|
|
const vec2 angle = vec2(0.0,0.0);
|
|
// size of curved corners
|
|
float cornersize = 0.01;
|
|
// border smoothness parameter
|
|
// decrease if borders are too aliased
|
|
float cornersmooth = 800.0;
|
|
|
|
// END of parameters
|
|
|
|
|
|
float intersect(vec2 xy, vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float A = dot(xy,xy)+d*d;
|
|
float B = 2.0*(R*(dot(xy,sinangle)-d*cosangle.x*cosangle.y)-d*d);
|
|
float C = d*d + 2.0*R*d*cosangle.x*cosangle.y;
|
|
return (-B-sqrt(B*B-4.0*A*C))/(2.0*A);
|
|
}
|
|
|
|
vec2 bkwtrans(vec2 xy, vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float c = intersect(xy, sinangle, cosangle);
|
|
vec2 point = vec2(c)*xy;
|
|
point -= vec2(-R)*sinangle;
|
|
point /= vec2(R);
|
|
vec2 tang = sinangle/cosangle;
|
|
vec2 poc = point/cosangle;
|
|
float A = dot(tang,tang)+1.0;
|
|
float B = -2.0*dot(poc,tang);
|
|
float C = dot(poc,poc)-1.0;
|
|
float a = (-B+sqrt(B*B-4.0*A*C))/(2.0*A);
|
|
vec2 uv = (point-a*sinangle)/cosangle;
|
|
float r = FIX(R*acos(a));
|
|
return uv*r/sin(r/R);
|
|
}
|
|
|
|
vec2 fwtrans(vec2 uv, vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float r = FIX(sqrt(dot(uv,uv)));
|
|
uv *= sin(r/R)/r;
|
|
float x = 1.0-cos(r/R);
|
|
float D = d/R + x*cosangle.x*cosangle.y+dot(uv,sinangle);
|
|
return d*(uv*cosangle-x*sinangle)/D;
|
|
}
|
|
|
|
vec3 maxscale(vec2 sinangle, vec2 cosangle)
|
|
{
|
|
vec2 c = bkwtrans(-R * sinangle / (1.0 + R/d*cosangle.x*cosangle.y), sinangle, cosangle);
|
|
vec2 a = vec2(0.5,0.5)*aspect;
|
|
vec2 lo = vec2(fwtrans(vec2(-a.x,c.y), sinangle, cosangle).x,
|
|
fwtrans(vec2(c.x,-a.y), sinangle, cosangle).y)/aspect;
|
|
vec2 hi = vec2(fwtrans(vec2(+a.x,c.y), sinangle, cosangle).x,
|
|
fwtrans(vec2(c.x,+a.y), sinangle, cosangle).y)/aspect;
|
|
return vec3((hi+lo)*aspect*0.5,max(hi.x-lo.x,hi.y-lo.y));
|
|
}
|
|
|
|
// Calculate the influence of a scanline on the current pixel.
|
|
//
|
|
// 'distance' is the distance in texture coordinates from the current
|
|
// pixel to the scanline in question.
|
|
// 'color' is the colour of the scanline at the horizontal location of
|
|
// the current pixel.
|
|
vec4 scanlineWeights(float distance, vec4 color)
|
|
{
|
|
// "wid" controls the width of the scanline beam, for each RGB
|
|
// channel The "weights" lines basically specify the formula
|
|
// that gives you the profile of the beam, i.e. the intensity as
|
|
// a function of distance from the vertical center of the
|
|
// scanline. In this case, it is gaussian if width=2, and
|
|
// becomes nongaussian for larger widths. Ideally this should
|
|
// be normalized so that the integral across the beam is
|
|
// independent of its width. That is, for a narrower beam
|
|
// "weights" should have a higher peak at the center of the
|
|
// scanline than for a wider beam.
|
|
#ifdef USEGAUSSIAN
|
|
vec4 wid = 0.3 + 0.1 * pow(color, vec4(3.0));
|
|
vec4 weights = vec4(distance / wid);
|
|
return 0.4 * exp(-weights * weights) / wid;
|
|
#else
|
|
vec4 wid = 2.0 + 2.0 * pow(color, vec4(4.0));
|
|
vec4 weights = vec4(distance / 0.3);
|
|
return 1.4 * exp(-pow(weights * rsqrt(0.5 * wid), wid)) / (0.6 + 0.2 * wid);
|
|
#endif
|
|
}
|
|
|
|
#pragma stage vertex
|
|
layout(location = 0) in vec4 Position;
|
|
layout(location = 1) in vec2 TexCoord;
|
|
layout(location = 0) out vec2 vTexCoord;
|
|
layout(location = 1) out vec2 one;
|
|
layout(location = 2) out float mod_factor;
|
|
layout(location = 3) out vec2 ilfac;
|
|
layout(location = 4) out vec3 stretch;
|
|
layout(location = 5) out vec2 sinangle;
|
|
layout(location = 6) out vec2 cosangle;
|
|
|
|
void main()
|
|
{
|
|
gl_Position = global.MVP * Position;
|
|
vTexCoord = TexCoord;
|
|
|
|
// Precalculate a bunch of useful values we'll need in the fragment
|
|
// shader.
|
|
sinangle = sin(angle);
|
|
cosangle = cos(angle);
|
|
stretch = maxscale(sinangle, cosangle);
|
|
|
|
#ifdef INTERLACED
|
|
ilfac = vec2(1.0,clamp(floor(params.SourceSize.y/200.0),1.0,2.0));
|
|
#else
|
|
ilfac = vec2(1.0,clamp(floor(params.SourceSize.y/1000.0),1.0,2.0));
|
|
#endif
|
|
|
|
// The size of one texel, in texture-coordinates.
|
|
one = ilfac / params.crt_interlaced_halation_refpassSize.xy;
|
|
|
|
// Resulting X pixel-coordinate of the pixel we're drawing.
|
|
mod_factor = vTexCoord.x * params.crt_interlaced_halation_refpassSize.x * params.OutputSize.x / params.crt_interlaced_halation_refpassSize.x;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 vTexCoord;
|
|
layout(location = 1) in vec2 one;
|
|
layout(location = 2) in float mod_factor;
|
|
layout(location = 3) in vec2 ilfac;
|
|
layout(location = 4) in vec3 stretch;
|
|
layout(location = 5) in vec2 sinangle;
|
|
layout(location = 6) in vec2 cosangle;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D Source;
|
|
layout(set = 0, binding = 3) uniform sampler2D crt_interlaced_halation_refpass;
|
|
|
|
#define mul(a, b) (b * a)
|
|
|
|
void main()
|
|
{
|
|
// Here's a helpful diagram to keep in mind while trying to
|
|
// understand the code:
|
|
//
|
|
// | | | | |
|
|
// -------------------------------
|
|
// | | | | |
|
|
// | 01 | 11 | 21 | 31 | <-- current scanline
|
|
// | | @ | | |
|
|
// -------------------------------
|
|
// | | | | |
|
|
// | 02 | 12 | 22 | 32 | <-- next scanline
|
|
// | | | | |
|
|
// -------------------------------
|
|
// | | | | |
|
|
//
|
|
// Each character-cell represents a pixel on the output
|
|
// surface, "@" represents the current pixel (always somewhere
|
|
// in the bottom half of the current scan-line, or the top-half
|
|
// of the next scanline). The grid of lines represents the
|
|
// edges of the texels of the underlying texture.
|
|
|
|
// Texture coordinates of the texel containing the active pixel.
|
|
#ifdef CURVATURE
|
|
vec2 cd = vTexCoord;
|
|
//cd *= ORIG.texture_size / ORIG.video_size;
|
|
cd = (cd-vec2(0.5))*aspect*stretch.z+stretch.xy;
|
|
vec2 xy = (bkwtrans(cd, sinangle, cosangle)/overscan/aspect+vec2(0.5));// * ORIG.video_size / ORIG.texture_size;
|
|
|
|
#else
|
|
vec2 xy = vTexCoord;
|
|
#endif
|
|
vec2 cd2 = xy;
|
|
//cd2 *= ORIG.texture_size / ORIG.video_size;
|
|
cd2 = (cd2 - vec2(0.5)) * overscan + vec2(0.5);
|
|
cd2 = min(cd2, vec2(1.0)-cd2) * aspect;
|
|
vec2 cdist = vec2(cornersize);
|
|
cd2 = (cdist - min(cd2,cdist));
|
|
float dist = sqrt(dot(cd2,cd2));
|
|
float cval = clamp((cdist.x-dist)*cornersmooth,0.0, 1.0);
|
|
|
|
vec2 xy2 = ((xy-vec2(0.5))*vec2(1.0,1.0)+vec2(0.5));//*IN.video_size/IN.texture_size;
|
|
// Of all the pixels that are mapped onto the texel we are
|
|
// currently rendering, which pixel are we currently rendering?
|
|
vec2 ilfloat = vec2(0.0,ilfac.y > 1.5 ? mod(vec2(params.FrameCount,params.FrameCount).x,2.0) : 0.0);
|
|
|
|
vec2 ratio_scale = (xy * params.SourceSize.xy - vec2(0.5) + ilfloat)/ilfac;
|
|
|
|
#ifdef OVERSAMPLE
|
|
//float filter = fwidth(ratio_scale.y);
|
|
float os_filter = params.SourceSize.y / params.OutputSize.y;
|
|
#endif
|
|
vec2 uv_ratio = fract(ratio_scale);
|
|
|
|
// Snap to the center of the underlying texel.
|
|
xy = (floor(ratio_scale)*ilfac + vec2(0.5) - ilfloat) / params.SourceSize.xy;
|
|
|
|
// Calculate Lanczos scaling coefficients describing the effect
|
|
// of various neighbour texels in a scanline on the current
|
|
// pixel.
|
|
vec4 coeffs = PI * vec4(1.0 + uv_ratio.x, uv_ratio.x, 1.0 - uv_ratio.x, 2.0 - uv_ratio.x);
|
|
|
|
// Prevent division by zero.
|
|
coeffs = FIX(coeffs);
|
|
|
|
// Lanczos2 kernel.
|
|
coeffs = 2.0 * sin(coeffs) * sin(coeffs / 2.0) / (coeffs * coeffs);
|
|
|
|
// Normalize.
|
|
coeffs /= dot(coeffs, vec4(1.0));
|
|
|
|
// Calculate the effective colour of the current and next
|
|
// scanlines at the horizontal location of the current pixel,
|
|
// using the Lanczos coefficients above.
|
|
vec4 col = clamp(mul(coeffs, mat4x4(
|
|
TEX2D(xy + vec2(-one.x, 0.0)),
|
|
TEX2D(xy),
|
|
TEX2D(xy + vec2(one.x, 0.0)),
|
|
TEX2D(xy + vec2(2.0 * one.x, 0.0)))),
|
|
0.0, 1.0);
|
|
vec4 col2 = clamp(mul(coeffs, mat4x4(
|
|
TEX2D(xy + vec2(-one.x, one.y)),
|
|
TEX2D(xy + vec2(0.0, one.y)),
|
|
TEX2D(xy + one),
|
|
TEX2D(xy + vec2(2.0 * one.x, one.y)))),
|
|
0.0, 1.0);
|
|
|
|
|
|
#ifndef LINEAR_PROCESSING
|
|
col = pow(col , vec4(CRTgamma));
|
|
col2 = pow(col2, vec4(CRTgamma));
|
|
#endif
|
|
|
|
// Calculate the influence of the current and next scanlines on
|
|
// the current pixel.
|
|
vec4 weights = scanlineWeights(uv_ratio.y, col);
|
|
vec4 weights2 = scanlineWeights(1.0 - uv_ratio.y, col2);
|
|
#ifdef OVERSAMPLE
|
|
uv_ratio.y =uv_ratio.y+1.0/3.0*os_filter;
|
|
weights = (weights+scanlineWeights(uv_ratio.y, col))/3.0;
|
|
weights2=(weights2+scanlineWeights(abs(1.0-uv_ratio.y), col2))/3.0;
|
|
uv_ratio.y =uv_ratio.y-2.0/3.0*os_filter;
|
|
weights=weights+scanlineWeights(abs(uv_ratio.y), col)/3.0;
|
|
weights2=weights2+scanlineWeights(abs(1.0-uv_ratio.y), col2)/3.0;
|
|
#endif
|
|
vec3 mul_res = (col * weights + col2 * weights2).rgb;
|
|
#ifdef MULTIPASS
|
|
mul_res += pow(texture(Source, xy2).rgb, vec3(monitorgamma))*0.1;
|
|
#endif
|
|
mul_res *= vec3(cval);
|
|
|
|
// dot-mask emulation:
|
|
// Output pixels are alternately tinted green and magenta.
|
|
#ifdef DOTMASK
|
|
vec3 dotMaskWeights = mix(
|
|
vec3(1.0, 0.7, 1.0),
|
|
vec3(0.7, 1.0, 0.7),
|
|
floor(mod(mod_factor, 2.0))
|
|
);
|
|
#else
|
|
vec3 dotMaskWeights = mix(
|
|
vec3(1.0, 1.0, 1.0),
|
|
vec3(1.0, 1.0, 1.0),
|
|
floor(mod(mod_factor, 2.0)));
|
|
#endif
|
|
|
|
|
|
mul_res *= dotMaskWeights;
|
|
|
|
// Convert the image gamma for display on our output device.
|
|
mul_res = pow(mul_res, vec3(1.0 / monitorgamma));
|
|
|
|
// Color the texel.
|
|
FragColor = vec4(mul_res, 1.0);
|
|
}
|