49 lines
1.2 KiB
GLSL
49 lines
1.2 KiB
GLSL
#version 120
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varying vec2 vertex;
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varying vec3 velocity;
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varying float decay;
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varying float explCenterDist;
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float pi = 3.14159;
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vec3 hsv2rgb(vec3 c)
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{
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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float hash(float n)
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{
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return fract(sin(n)*43758.5453);
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}
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void main()
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{
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// normalize radius from 0..1
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vec2 vn = 2.0*vertex;
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float rn = length(vn);
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float angle = atan(vn.y, vn.x);
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float hs = 20.0;
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float removeCorners = 0.5 * (hash(fract(hs*vertex.x)) + hash(fract(hs*vertex.y)));
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if (rn+removeCorners > 1.0) {
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discard;
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}
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//float rf = 0.5-0.5*rn;
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float rf = 1.0;
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float d = decay/(1.0+max(0.0, 1.0-2.0*explCenterDist));
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float h = max(0.0, (1.0-d)/6.0) * rf;
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float v = max(0.0, (1.0-log(d)));
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float s = max(0.0, min(30.0 * sqrt(decay) * explCenterDist, 1.0));
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//v /= 1.0 + max(0.0, min(35.0*(decay-0.2), 1.0)) + 10.0 * explCenterDist;
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v /= 1.0 + 10.0 * explCenterDist;
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gl_FragColor = vec4(hsv2rgb(vec3(h, s, v)), v*0.2);
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//gl_FragColor = vec4(1.0, 1.0, 0.0, 1.0);
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//gl_FragColor.rgb = vec3(0.5+0.5*(a/pi));
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}
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