mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-11-30 11:21:32 +11:00
323 lines
11 KiB
Plaintext
323 lines
11 KiB
Plaintext
#version 450
|
|
|
|
/* CRT shader
|
|
*
|
|
* Copyright (C) 2010-2016 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.
|
|
*/
|
|
|
|
#include "geom-deluxe-params.inc"
|
|
|
|
#define u_tex_size0 global.SourceSize
|
|
#define u_tex_size1 global.internal1Size
|
|
#define u_quad_dims global.OutputSize
|
|
|
|
// Comment the next line to disable interpolation in linear gamma (and gain speed).
|
|
//#define LINEAR_PROCESSING
|
|
|
|
// Enable 3x oversampling of the beam profile
|
|
#define OVERSAMPLE
|
|
|
|
// Use the older, purely gaussian beam profile
|
|
#define USEGAUSSIAN
|
|
|
|
// Macros.
|
|
#define FIX(c) max(abs(c), 1e-5)
|
|
#define PI 3.141592653589
|
|
|
|
#pragma stage vertex
|
|
layout(location = 0) in vec4 Position;
|
|
layout(location = 1) in vec2 TexCoord;
|
|
layout(location = 0) out vec2 v_texCoord;
|
|
layout(location = 1) out vec2 v_sinangle;
|
|
layout(location = 2) out vec2 v_cosangle;
|
|
layout(location = 3) out vec3 v_stretch;
|
|
layout(location = 4) out vec2 v_one;
|
|
|
|
float intersect(vec2 xy , vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float A = dot(xy,xy)+d.x*d.x;
|
|
float B = 2.0*(params.R.x*(dot(xy,sinangle)-d.x*cosangle.x*cosangle.y)-d.x*d.x);
|
|
float C = d.x*d.x + 2.0*params.R.x*d.x*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 pt = vec2(c)*xy;
|
|
pt -= vec2(-params.R.x)*sinangle;
|
|
pt /= vec2(params.R.x);
|
|
vec2 tang = sinangle/cosangle;
|
|
vec2 poc = pt/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 = (pt-a*sinangle)/cosangle;
|
|
float r = FIX(params.R.x*acos(a));
|
|
return uv*r/sin(r/params.R.x);
|
|
}
|
|
|
|
vec2 fwtrans(vec2 uv, vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float r = FIX(sqrt(dot(uv,uv)));
|
|
uv *= sin(r/params.R.x)/r;
|
|
float x = 1.0-cos(r/params.R.x);
|
|
float D = d.x/params.R.x + x*cosangle.x*cosangle.y+dot(uv,sinangle);
|
|
return d.x*(uv*cosangle-x*sinangle)/D;
|
|
}
|
|
|
|
vec3 maxscale(vec2 sinangle, vec2 cosangle)
|
|
{
|
|
vec2 c = bkwtrans(-params.R.x * sinangle / (1.0 + params.R.x/d.x*cosangle.x*cosangle.y), sinangle, cosangle);
|
|
vec2 a = vec2(0.5,0.5)*aspect.xy;
|
|
vec2 lo = vec2(fwtrans(vec2(-a.x,c.y), sinangle, cosangle).x,
|
|
fwtrans(vec2(c.x,-a.y), sinangle, cosangle).y)/aspect.xy;
|
|
vec2 hi = vec2(fwtrans(vec2(+a.x,c.y), sinangle, cosangle).x,
|
|
fwtrans(vec2(c.x,+a.y), sinangle, cosangle).y)/aspect.xy;
|
|
return vec3((hi+lo)*aspect.xy*0.5,max(hi.x-lo.x,hi.y-lo.y));
|
|
}
|
|
|
|
void main()
|
|
{
|
|
gl_Position = global.MVP * Position;
|
|
v_texCoord = TexCoord;
|
|
|
|
// Precalculate a bunch of useful values we'll need in the fragment
|
|
// shader.
|
|
vec2 ang;
|
|
// if (u_rotation_type.x < 0.5)
|
|
// ang = vec2(0.0,angle.x);
|
|
// else if (u_rotation_type.x < 1.5)
|
|
// ang = vec2(angle.x,0.0);
|
|
// else if (u_rotation_type.x < 2.5)
|
|
// ang = vec2(0.0,-angle.x);
|
|
// else
|
|
// ang = vec2(-angle.x,0.0);
|
|
ang = angle.xy;
|
|
v_sinangle = sin(ang);
|
|
v_cosangle = cos(ang);
|
|
v_stretch = maxscale(v_sinangle, v_cosangle);
|
|
|
|
// The size of one texel, in texture-coordinates.
|
|
v_one = 1.0 / u_tex_size0.xy;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 v_texCoord;
|
|
layout(location = 1) in vec2 v_sinangle;
|
|
layout(location = 2) in vec2 v_cosangle;
|
|
layout(location = 3) in vec3 v_stretch;
|
|
layout(location = 4) in vec2 v_one;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D blur;
|
|
layout(set = 0, binding = 3) uniform sampler2D internal1;
|
|
layout(set = 0, binding = 4) uniform sampler2D aperture;
|
|
layout(set = 0, binding = 5) uniform sampler2D slot;
|
|
layout(set = 0, binding = 6) uniform sampler2D delta;
|
|
|
|
#define blur_texture blur
|
|
|
|
#ifdef LINEAR_PROCESSING
|
|
# define TEX2D(c) pow(texture(internal1, (c)), vec4(CRTgamma))
|
|
#else
|
|
# define TEX2D(c) texture(internal1, (c))
|
|
#endif
|
|
|
|
float intersect(vec2 xy , vec2 sinangle, vec2 cosangle)
|
|
{
|
|
float A = dot(xy,xy)+d.x*d.x;
|
|
float B = 2.0*(params.R.x*(dot(xy,sinangle)-d.x*cosangle.x*cosangle.y)-d.x*d.x);
|
|
float C = d.x*d.x + 2.0*params.R.x*d.x*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 pt = vec2(c)*xy;
|
|
pt -= vec2(-params.R.x)*sinangle;
|
|
pt /= vec2(params.R.x);
|
|
vec2 tang = sinangle/cosangle;
|
|
vec2 poc = pt/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 = (pt-a*sinangle)/cosangle;
|
|
float r = FIX(params.R.x*acos(a));
|
|
return uv*r/sin(r/params.R.x);
|
|
}
|
|
|
|
vec2 transform(vec2 coord, vec3 stretch, vec2 sinangle, vec2 cosangle)
|
|
{
|
|
coord = (coord-vec2(0.5))*aspect.xy*stretch.z+stretch.xy;
|
|
return (bkwtrans(coord, sinangle, cosangle)/overscan.xy/aspect.xy+vec2(0.5));
|
|
}
|
|
|
|
float corner(vec2 coord)
|
|
{
|
|
coord = (coord - vec2(0.5)) * overscan.xy + vec2(0.5);
|
|
coord = min(coord, vec2(1.0)-coord) * aspect.xy;
|
|
vec2 cdist = vec2(cornersize.x);
|
|
coord = (cdist - min(coord,cdist));
|
|
float dist = sqrt(dot(coord,coord));
|
|
return clamp((max(cdist.x,1e-3)-dist)*cornersmooth.x,0.0, 1.0);
|
|
}
|
|
|
|
// 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 * inversesqrt(0.5 * wid), wid)) / (0.6 + 0.2 * wid);
|
|
#endif
|
|
}
|
|
|
|
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.
|
|
vec2 xy;
|
|
if (curvature.x > 0.5)
|
|
xy = transform(v_texCoord, v_stretch, v_sinangle, v_cosangle);
|
|
else
|
|
xy = (v_texCoord-vec2(0.5))/overscan.xy+vec2(0.5);
|
|
vec2 xy0 = xy;
|
|
float cval = corner(xy);
|
|
|
|
// Of all the pixels that are mapped onto the texel we are
|
|
// currently rendering, which pixel are we currently rendering?
|
|
vec2 ratio_scale = xy * u_tex_size0.xy - vec2(0.5);
|
|
|
|
#ifdef OVERSAMPLE
|
|
float oversample_filter = fwidth(ratio_scale.y);
|
|
#endif
|
|
vec2 uv_ratio = fract(ratio_scale);
|
|
|
|
// Snap to the center of the underlying texel.
|
|
xy = (floor(ratio_scale) + vec2(0.5)) / u_tex_size0.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(TEX2D(xy + vec2(-v_one.x, 0.0))*coeffs.x +
|
|
TEX2D(xy)*coeffs.y +
|
|
TEX2D(xy +vec2(v_one.x, 0.0))*coeffs.z +
|
|
TEX2D(xy + vec2(2.0 * v_one.x, 0.0))*coeffs.w , 0.0, 1.0);
|
|
|
|
vec4 col2 = clamp(TEX2D(xy + vec2(-v_one.x, v_one.y))*coeffs.x +
|
|
TEX2D(xy + vec2(0.0, v_one.y))*coeffs.y +
|
|
TEX2D(xy + v_one)*coeffs.z +
|
|
TEX2D(xy + vec2(2.0 * v_one.x, v_one.y))*coeffs.w , 0.0, 1.0);
|
|
|
|
|
|
#ifndef LINEAR_PROCESSING
|
|
col = pow(col , vec4(CRTgamma.x));
|
|
col2 = pow(col2, vec4(CRTgamma.x));
|
|
#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*oversample_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*oversample_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;
|
|
|
|
// halation and corners
|
|
vec3 blur = pow(texture(blur_texture,xy0).rgb, vec3(CRTgamma.x));
|
|
mul_res = mix(mul_res, blur, halation.x) * vec3(cval);
|
|
|
|
// Convert the image gamma for display on our output device.
|
|
mul_res = pow(mul_res, vec3(1.0 / monitorgamma.x));
|
|
|
|
// Shadow mask
|
|
// original code; just makes a giant phosphor here
|
|
// xy = v_texCoord.xy * u_quad_dims.xy / u_tex_size1.xy;
|
|
|
|
// tiling; looks nasty at non-integer x and/or y
|
|
// xy = fract(v_texCoord * global.SourceSize.xy * 1.9999);
|
|
|
|
// gl_FragCoord; tied to physical pixel size
|
|
xy = v_texCoord.xy * global.OutputSize.xy;
|
|
|
|
//vec3 mask = texture(mask_texture, xy).rgb;
|
|
vec3 mask = vec3(1.0);
|
|
if(mask_picker == 0) // no mask
|
|
{
|
|
FragColor = vec4(mul_res, col.a);
|
|
return;
|
|
}
|
|
else if(mask_picker == 1) mask = texture(aperture, xy * 0.3333).rgb;
|
|
else if(mask_picker == 2) mask = texture(slot, xy * 0.25).rgb;
|
|
else mask = texture(delta, xy * 0.49999).rgb;
|
|
mask = mix(vec3(1.0), mask, aperture_strength.x);
|
|
|
|
FragColor = vec4(mul_res*mask, col.a);
|
|
} |