slang-shaders/nnedi3/shaders/jinc2-cshift-luma.slang

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2017-03-28 05:59:49 +11:00
#version 450
/*
Hyllian's jinc windowed-jinc 2-lobe with anti-ringing Shader
Copyright (C) 2011-2014 Hyllian/Jararaca - sergiogdb@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.
*/
/*
This is an approximation of Jinc(x)*Jinc(x*r1/r2) for x < 2.5,
where r1 and r2 are the first two zeros of jinc function.
For a jinc 2-lobe best approximation, use A=0.5 and B=0.825.
*/
// A=0.5, B=0.825 is the best jinc approximation for x<2.5. if B=1.0, it's a lanczos filter.
// Increase A to get more blur. Decrease it to get a sharper picture.
// B = 0.825 to get rid of dithering. Increase B to get a fine sharpness, though dithering returns.
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
float JINC2_WINDOW_SINC;
float JINC2_SINC;
float JINC2_AR_STRENGTH;
} params;
#pragma parameter JINC2_WINDOW_SINC "Window Sinc Param" 0.44 0.0 1.0 0.01
#define JINC2_WINDOW_SINC params.JINC2_WINDOW_SINC
#pragma parameter JINC2_SINC "Sinc Param" 0.82 0.0 1.0 0.01
#define JINC2_SINC params.JINC2_SINC
#pragma parameter JINC2_AR_STRENGTH "Anti-ringing Strength" 0.5 0.0 1.0 0.1
#define JINC2_AR_STRENGTH params.JINC2_AR_STRENGTH
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
} global;
#define halfpi 1.5707963267948966192313216916398
#define pi 3.1415926535897932384626433832795
#define wa (JINC2_WINDOW_SINC*pi)
#define wb (JINC2_SINC*pi)
// Calculates the distance between two points
float d(vec2 pt1, vec2 pt2)
{
vec2 v = pt2 - pt1;
return sqrt(dot(v,v));
}
float min4(float a, float b, float c, float d)
{
return min(a, min(b, min(c, d)));
}
float max4(float a, float b, float c, float d)
{
return max(a, max(b, max(c, d)));
}
vec4 resampler(vec4 x)
{
vec4 res;
res.x = (x.x==0.0) ? (wa*wb) : sin(x.x*wa)*sin(x.x*wb)/(x.x*x.x);
res.y = (x.y==0.0) ? (wa*wb) : sin(x.y*wa)*sin(x.y*wb)/(x.y*x.y);
res.z = (x.z==0.0) ? (wa*wb) : sin(x.z*wa)*sin(x.z*wb)/(x.z*x.z);
res.w = (x.w==0.0) ? (wa*wb) : sin(x.w*wa)*sin(x.w*wb)/(x.w*x.w);
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return res;
}
#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(1.0001);
}
#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()
{
float color;
mat4x4 weights;
vec2 dx = vec2(1.0, 0.0);
vec2 dy = vec2(0.0, 1.0);
//Correct NNEDI3's center shift
vec2 pc = vec2(((vTexCoord.x / params.SourceSize.z) - 0.5), ((vTexCoord.y / params.SourceSize.w) - 0.5));
vec2 tc = (floor(pc-vec2(0.5,0.5))+vec2(0.5,0.5));
weights[0] = resampler(vec4(d(pc, tc -dx -dy), d(pc, tc -dy), d(pc, tc +dx -dy), d(pc, tc+2.0*dx -dy)));
weights[1] = resampler(vec4(d(pc, tc -dx ), d(pc, tc ), d(pc, tc +dx ), d(pc, tc+2.0*dx )));
weights[2] = resampler(vec4(d(pc, tc -dx +dy), d(pc, tc +dy), d(pc, tc +dx +dy), d(pc, tc+2.0*dx +dy)));
weights[3] = resampler(vec4(d(pc, tc -dx+2.0*dy), d(pc, tc +2.0*dy), d(pc, tc +dx+2.0*dy), d(pc, tc+2.0*dx+2.0*dy)));
dx = dx * params.SourceSize.zw;
dy = dy * params.SourceSize.zw;
tc = tc * params.SourceSize.zw;
// reading the texels
float c00 = texture(Source, tc -dx -dy).x;
float c10 = texture(Source, tc -dy).x;
float c20 = texture(Source, tc +dx -dy).x;
float c30 = texture(Source, tc+2.0*dx -dy).x;
float c01 = texture(Source, tc -dx ).x;
float c11 = texture(Source, tc ).x;
float c21 = texture(Source, tc +dx ).x;
float c31 = texture(Source, tc+2.0*dx ).x;
float c02 = texture(Source, tc -dx +dy).x;
float c12 = texture(Source, tc +dy).x;
float c22 = texture(Source, tc +dx +dy).x;
float c32 = texture(Source, tc+2.0*dx +dy).x;
float c03 = texture(Source, tc -dx+2.0*dy).x;
float c13 = texture(Source, tc +2.0*dy).x;
float c23 = texture(Source, tc +dx+2.0*dy).x;
float c33 = texture(Source, tc+2.0*dx+2.0*dy).x;
// Get min/max samples
float min_sample = min4(c11, c21, c12, c22);
float max_sample = max4(c11, c21, c12, c22);
color = dot(vec4(c00, c10, c20, c30), weights[0]);
color += dot(vec4(c01, c11, c21, c31), weights[1]);
color += dot(vec4(c02, c12, c22, c32), weights[2]);
color += dot(vec4(c03, c13, c23, c33), weights[3]);
color = color/(dot(weights * vec4(1.0), vec4(1.0)));
// Anti-ringing
float aux = color;
color = clamp(color, min_sample, max_sample);
color = mix(aux, color, JINC2_AR_STRENGTH);
// final sum and weight normalization
FragColor = vec4(color, 1.0, 1.0, 1.0);
}