2023-07-22 23:59:17 +08:00
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#version 310 es
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precision highp float;
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precision highp int;
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// Shader from http://www.iquilezles.org/apps/shadertoy/
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layout(std140, binding = 0) uniform fs_ub {
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vec2 center;
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vec2 resolution;
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vec2 u_screenSize;
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vec4 u_Time;
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};
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//float u( float x ) { return 0.5+0.5*sign(x); }
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float u( float x ) { return (x>0.0)?1.0:0.0; }
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//float u( float x ) { return abs(x)/x; }
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2023-07-25 19:06:12 +08:00
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layout(location = SV_Target0) out vec4 FragColor;
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2023-07-22 23:59:17 +08:00
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void main(void)
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{
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float time = u_Time[1];
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#ifdef METAL
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vec2 fragCoord = vec2(gl_FragCoord.x, u_screenSize.y - gl_FragCoord.y);
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#else
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vec2 fragCoord = gl_FragCoord.xy;
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#endif
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vec2 p = 2.0 * (fragCoord - center.xy) / resolution.xy;
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float a = atan(p.x,p.y);
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float r = length(p)*.75;
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float w = cos(3.1415927*time-r*2.0);
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float h = 0.5+0.5*cos(12.0*a-w*7.0+r*8.0);
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float d = 0.25+0.75*pow(h,1.0*r)*(0.7+0.3*w);
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float rd = 1.0-r/d;
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float col = 0.0;
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if(rd > 0.0)
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col = u( d-r ) * sqrt(rd)*r*2.5;
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col *= 1.25+0.25*cos((12.0*a-w*7.0+r*8.0)/2.0);
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col *= 1.0 - 0.35*(0.5+0.5*sin(r*30.0))*(0.5+0.5*cos(12.0*a-w*7.0+r*8.0));
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FragColor = vec4(
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col,
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col-h*0.5+r*.2 + 0.35*h*(1.0-r),
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col-h*r + 0.1*h*(1.0-r),
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1.0);
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}
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