mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-10-18 15:51:30 +11:00
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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OutputSize;
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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;
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}
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// --- hexamaze https://www.shadertoy.com/view/ll2cRR
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float v; vec3 V;
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#define f(U) ( \
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V = ( ( (U) -9.*global.FrameCount / 60 ) * mat2(cos(.1 + vec4(0,11,33,0))) ) \
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* mat3x2( 12, -7, 0, 14, 12, 7 ) / 1e2 , \
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vec4( fract( V[ 1 + int( 2.* sin( 1e5* length( ceil( V.xy )))) ] ) < .1 )\
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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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void main()
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{
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// variant of https://shadertoy.com/view/WtjBzV
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// adapted from https://shadertoy.com/view/3ljfRG
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#define R global.OutputSize.xy
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#define N 5 // pixel oversampling NxN ( only where necessary )
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#define eps 1e-2 // similarity threshold, is case of continuous mask
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//#define T(U,l) texelFetch(iChannel0, ivec2(U)>>l, l)
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#define T(U,l) textureLod(Source, (U)/R, float(l-1) )
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// #define keyToggle(a) ( texelFetch(iChannel3,ivec2(a,2),0).x > 0.)
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vec2 U = vTexCoord;
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O -= O;
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float n = float(N),
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m = T( U, 2 ).w, // check neighborhood. Here: LOD #2 of mask
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// s = iMouse.z>0. ? iMouse.x : R.x/2.;
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if ( U.x > 0.5
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// && m !=0. && m!= 1.) { // neighborhood does not agree
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&& abs(m-T(U,0).w) > eps ) { // why ? otherwise, inside don't work in fullscreen
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// if ( true ) { // for bench: always oversample
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for (int k=0; k<N*N; k++) { // --- oversampling
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vec2 D = ( vec2(k%N,k/N) - float(N-1)/2. ) / n; // subpixel
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O += f( U + D ).w;
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}
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O /= n*n;
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}
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else // LOD#0 is ok
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// O = keyToggle(32) // SPACE: show red/blue where not oversampled
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// ? T( U, 0 ).w == 1. ? vec4(1,0,0,1) : vec4(0,0,1,1)
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// : T, 0 ( U).wwww;
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0 = ( U).wwww;
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if ( abs(U.x-0.5) < 1. ) O = vec4(1,0,0,1); // red separator
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O = pow( O, vec4(1./2.2) ); // to sRGB
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FragColor = vec4(O, 1.0);
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} |