slang-shaders/crt/shaders/crt-maximus-royale/src/resize.slang

#version 450

/////////////////////////////  GPL LICENSE NOTICE  /////////////////////////////

//  crt-maximus-royale: A fully customizable extension for crt-royale shader,
//  inside a TV / MONITOR BOX with backlight and some other cool stuff.
//  Copyright (C) 2022 DigiDwrf
//
//  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 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


layout(push_constant) uniform Push
{
   float Xscale;
   float Yscale;
   float crtFrame;
} params;

layout(std140, set = 0, binding = 0) uniform UBO
{
   mat4 MVP;
} global;

#pragma parameter Xscale "Horizontal Scale %" 100.0 75.0 150.0 0.1
#pragma parameter Yscale "Vertical Scale %" 100.0 75.0 150.0 0.1
#pragma parameter crtFrame "CRT Frame" 1.0 1.0 4.0 1.0

#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;
   vec2 center =  TexCoord.xy - 0.5;
   vec2 resizeCoord = vec2(params.Xscale,params.Yscale) * 0.01;

   float resizeFactor = 1.0;
   if (params.crtFrame == 3.0) resizeFactor = 0.835;
   if (params.crtFrame == 4.0)
   {
      resizeCoord *= vec2(1.0,0.985);
      resizeFactor = 0.92;
   }

   vTexCoord = 0.5 + center / resizeCoord / resizeFactor;
}

#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()
{
   FragColor = texture(Source, vTexCoord).rgba;
}