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https://github.com/libretro/slang-shaders.git
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92 lines
3.1 KiB
Plaintext
92 lines
3.1 KiB
Plaintext
#version 450
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// Skyline 3D - FabriceNeyret2 - 2015-07-02
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// https://www.shadertoy.com/view/4tlSWr
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// in the spirit of the 2D skylines (e.g., https://www.shadertoy.com/view/4tlXzM )... but in 3D :-) ( I even reproduced the original temporal aliasing :-D )
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// Be sure to wait long enough ;-)
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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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vec4 OutputSize;
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vec4 OriginalSize;
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vec4 SourceSize;
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uint FrameCount;
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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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const vec2 madd = vec2(0.5, 0.5);
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = gl_Position.xy;
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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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float iGlobalTime = float(global.FrameCount)*0.025;
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vec2 iResolution = global.OutputSize.xy;
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#define T iGlobalTime
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// --- using the base ray-marcher of Trisomie21: https://www.shadertoy.com/view/4tfGRB#
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vec4 bg = vec4(0); // vec4(0,0,.3,0);
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void mainImage( out vec4 f, vec2 w ) {
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vec4 p = vec4(w,0,1)/iResolution.yyxy-.5, d,c; p.x-=.4; // init ray
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// r(p.xz,.13); r(p.yz,.2); r(p.xy,.1); // camera rotations
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d =p; // ray dir = ray0-vec3(0)
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p.x += 15.*T; p += 2.*d;
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f = bg;
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float l,x=1e9, closest = 999.;
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for (float i=1.; i>0.; i-=.01) {
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vec4 u = floor(p/8.), t = mod(p, 8.)-4., ta; // objects id + local frame
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u.y = 0.;
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u = sin(78.17*(u+u.yzxw)); // randomize ids
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c = p/p*1.2;
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ta = abs(t);
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x=1e9;
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if (sin(17.*(u.x+u.y+u.z))>.95) { // 10% of blocks
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ta.y = p.y + 30.*u.x - .3*pow(abs(.03*floor(p.z)),3.) + 35.;
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x = max(ta.x,max(ta.y,ta.z)) -3.;
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}
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closest = min(closest, p.y+150.);
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// artifacts: passed a object, we might be fooled about dist to next (hidden in next modulo-tile)
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#if 1 // if dist to box border is closest to object, go there. <<< the working solution ! (at mod8 scale)
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vec4 k, k1 = (4.-t)/d ,k2 = (-4.-t)/d, dd;
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k = min (k1-1e5*sign(k1),k2-1e5*sign(k2))+1e5; // ugly trick to get the min only if positive.
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// 2 less ugly/costly formulations, but less robust close to /0 :
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// k = mix(k1,k2, .5+.5*sign(k2));
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// dd = d+.001*clamp(1.-d*d,.999,1.); k = (4.*sign(dd)-t)/dd;
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l = min(k.x,min(k.y,k.z));
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if (l<x) { p+= 1.*d*(l+0.01); continue; }
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#endif
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// if (x<.01) c = texture(iChannel0,.1*(p.xy+p.yz));
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if(x<.01) // hit !
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{ f = mix(bg,c,i*i); break; } // color texture + black fog
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p += d*x; // march ray
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}
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//if (length(f)==0.) f = vec4(1,1,.6,0)*smoothstep(.31,.3,length(w/iResolution.y-vec2(1.3,.7)));
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f += vec4(1) * exp(-.01*closest)*(.5+.5*cos(1.+T/8.)); // thanks kuvkar !
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}
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void main(void)
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{
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//just some shit to wrap shadertoy's stuff
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vec2 FragmentCoord = vTexCoord.xy*global.OutputSize.xy;
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FragmentCoord.y = -FragmentCoord.y;
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mainImage(FragColor,FragmentCoord);
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}
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