slang-shaders/crt/shaders/guest/fast/smoothing - kopija.slang

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#version 450
/*
Smart Smoothing Difference Shader
Copyright (C) 2019 guest(r) - guest.r@gmail.com
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#pragma name SmoothPass
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
float STH;
} params;
#pragma parameter STH "Smart Smoothing Threshold" 0.7 0.4 1.2 0.05
#define STH params.STH
#define SourceSize params.SourceSize
#define COMPAT_TEXTURE(c,d) texture(c,d)
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;
float df (vec3 A, vec3 B)
{
float diff = length(A-B);
float luma = clamp(length(0.5*min(A,B) + 0.25*(A+B) + 1e-8), 0.0001, 1.0);
float diff1 = diff/luma;
return 1.0 - clamp(7.0*(max(1.5*diff,diff1)-STH), 0.0, 1.0);
}
void main()
{
vec2 dx = vec2(SourceSize.z, 0.0);
vec2 dy = vec2(0.0, SourceSize.w);
vec3 l1 = COMPAT_TEXTURE(Source, vTexCoord.xy -dx).xyz;
vec3 ct = COMPAT_TEXTURE(Source, vTexCoord.xy ).xyz;
vec3 r1 = COMPAT_TEXTURE(Source, vTexCoord.xy +dx).xyz;
float dl = df(ct, l1);
float dr = df(ct, r1);
float resx = dl; float resy = dr;
FragColor = vec4(resx,resy,1.0,1.0);
}