27 lines
No EOL
650 B
GLSL
27 lines
No EOL
650 B
GLSL
#version 120
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varying vec2 vertex;
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varying vec2 velocity;
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varying float decay;
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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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void main()
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{
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gl_FragColor = vec4(0.5+0.5*vertex.x, 0.5+0.5*vertex.y, 0.0, 1.0);
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float r = length(vertex);
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if (r > 1.0) {
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discard;
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}
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float d = decay;
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float h = (1.0-d)/6.0;
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float v = max(0.0, (1.0-d/2.0) - 0.1*(d*d*d));
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float s = 1.0;
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gl_FragColor = vec4(hsv2rgb(vec3(h, s, v)), 1.0);
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//gl_FragColor = vec4(1.0, 1.0, 0.0, 1.0);
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} |