slang-shaders/cubic/shaders/spline16-x.slang

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#version 450
/*
Spline16 - PassX - by Hyllian 2022
Adapted from bicubic source shaders below.
Spline36 math sources: https://www.panotools.org/dersch/interpolator/interpolator.html
*/
/*
Copyright (C) 2010 Team XBMC
http://www.xbmc.org
Copyright (C) 2011 Stefanos A.
http://www.opentk.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, 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 XBMC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
http://www.gnu.org/copyleft/gpl.html
*/
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
} params;
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 + vec2(0.0001, 0.0001);;
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
float weight(float x)
{
x = abs(x);
if (x < 1.0)
{
return
(
((x - 9.0 / 5.0) * x - 1.0 / 5.0 ) * x + 1.0
);
}
else if ((x >= 1.0) && (x < 2.0))
{
return
(
(( -1.0 / 3.0 * (x - 1) + 4.0 / 5.0 ) * (x - 1) - 7.0 / 15.0 ) * (x - 1)
);
}
else
{
return 0.0;
}
}
vec4 weight4(float x)
{
return vec4(
weight(x - 2.0),
weight(x - 1.0),
weight(x),
weight(x + 1.0)
);
}
void main()
{
vec2 ps = params.SourceSize.zw;
vec2 pos = vTexCoord.xy + ps * vec2(0.5, 0.0);
vec2 fp = fract(pos / ps);
vec2 xystart = (-1.5 - fp) * ps + pos;
float ypos = xystart.y + ps.y * 2.0;
vec3 C0 = texture(Source, vec2(xystart.x , ypos)).rgb;
vec3 C1 = texture(Source, vec2(xystart.x + ps.x , ypos)).rgb;
vec3 C2 = texture(Source, vec2(xystart.x + ps.x * 2.0, ypos)).rgb;
vec3 C3 = texture(Source, vec2(xystart.x + ps.x * 3.0, ypos)).rgb;
vec4 w = weight4(1.0 - fp.x);
float sum = dot( w, vec4(1));
w /= sum;
vec3 color = mat4x3( C0, C1, C2, C3 ) * w;
FragColor = vec4(color, 1.0);
}