slang-shaders/crt/shaders/guest/advanced/afterglow0.slang

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#version 450
/*
Phosphor Afterglow Shader pass 0
Copyright (C) 2020 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.
*/
layout(push_constant) uniform Push
{
float PR, PG, PB;
} params;
#pragma parameter bogus_afterglow "[ AFTERGLOW SETTINGS ]:" 0.0 0.0 1.0 1.0
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#pragma parameter PR " Persistence Red" 0.32 0.0 0.50 0.01
#pragma parameter PG " Persistence Green" 0.32 0.0 0.50 0.01
#pragma parameter PB " Persistence Blue" 0.32 0.0 0.50 0.01
#define PR params.PR
#define PG params.PG
#define PB params.PB
#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 OriginalHistory0;
layout(set = 0, binding = 3) uniform sampler2D AfterglowPassFeedback;
#define TEX0 vTexCoord
void main()
{
vec3 color = COMPAT_TEXTURE(OriginalHistory0, TEX0.xy).rgb;
vec3 accumulate = COMPAT_TEXTURE(AfterglowPassFeedback, TEX0.xy).rgb;
float w = 1.0;
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if ((color.r + color.g + color.b < 5.0/255.0)) { w = 0.0; }
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vec3 result = mix( max(mix(color, accumulate, 0.49 + vec3(PR, PG, PB))- 2.0/255.0, 0.0), color, w);
FragColor = vec4(result, w);
}