mirror of
https://github.com/libretro/slang-shaders.git
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133 lines
3 KiB
Plaintext
133 lines
3 KiB
Plaintext
#version 450
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/*
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Bilateral filter - dynamic range (upscaler, downsampler)
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Copyright (C) 2024 guest(r)
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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layout(push_constant) uniform Push
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{
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vec4 SourceSize;
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vec4 OriginalSize;
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vec4 OutputSize;
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uint FrameCount;
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float FRANGE;
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float FBSMOOTH;
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float FBOOST;
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} params;
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#pragma parameter FRANGE "Filter Range" 2.0 1.0 10.0 1.0
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#define FRANGE params.FRANGE
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#pragma parameter FBSMOOTH "Filter Base Smoothing" 0.15 0.05 1.0 0.025
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#define FBSMOOTH params.FBSMOOTH
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#pragma parameter FBOOST "Boost Smoothing w. dist" 1.0 0.0 5.0 0.25
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#define FBOOST params.FBOOST
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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} global;
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 vTexCoord;
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = TexCoord * 1.00001;
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}
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#pragma stage fragment
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layout(location = 0) in vec2 vTexCoord;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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#define COMPAT_TEXTURE(c,d) texture(c,d)
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#define SourceSize params.SourceSize
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const vec3 luma = vec3(0.299,0.587,0.114);
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float wt(vec3 A, vec3 B)
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{
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return clamp(FBSMOOTH - 2.33*dot(abs(A-B),1.0.xxx)/(dot(A+B,1.0.xxx)+1.0), 0.0001, 0.125);
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}
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float getw(float x, vec3 c, vec3 p)
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{
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float y = max(1.0-x, 0.0) + FBOOST;
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float d = wt(c,p);
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return y*d;
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}
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void main()
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{
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vec2 pos = vTexCoord * SourceSize.xy;
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vec2 f = 0.5-fract(pos);
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vec2 tex = floor(pos)*SourceSize.zw + 0.5*SourceSize.zw;
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vec3 color = 0.0.xxx;
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vec2 dx = vec2(SourceSize.z, 0.0);
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vec2 dy = vec2(0.0, SourceSize.w);
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float w, fp;
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float wsum = 0.0;
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vec3 pixel;
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float FPR = FRANGE;
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float FPR1 = 1.0/FPR;
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float FPR3 = FPR*FPR;
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float LOOPSIZE = FPR;
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float y = -LOOPSIZE;
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float x = 0.0;
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vec3 comp = COMPAT_TEXTURE(Source, tex).rgb;
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do
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{
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x = -LOOPSIZE;
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do
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{
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fp = dot(vec2(x+f.x,y+f.y),vec2(x+f.x,y+f.y));
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if (fp >= FPR3) w = 0.0;
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else
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{
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pixel = COMPAT_TEXTURE(Source, tex + x*dx + y*dy).rgb;
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fp = sqrt(fp)*FPR1;
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w = getw(fp,comp,pixel);
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color = color + w * pixel;
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wsum = wsum + w;
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}
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x = x + 1.0;
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} while (x <= LOOPSIZE);
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y = y + 1.0;
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} while (y <= LOOPSIZE);
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color = color / wsum;
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FragColor = vec4(color, 1.0);
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}
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