48 lines
819 B
GLSL
48 lines
819 B
GLSL
/*
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@machine_shaman
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*/
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#extension GL_OES_standard_derivatives : enable
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform float time;
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uniform vec2 mouse;
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uniform vec2 resolution;
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mat2 rotate(float a) {
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float c = cos(a);
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float s = sin(a);
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return mat2(c, -s, s, c);
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}
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void main() {
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vec2 uv = (2. * gl_FragCoord.xy - resolution) / resolution.y;
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vec3 col = vec3(0.);
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vec3 ro = vec3(0.0, 0.0, -3.0);
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vec3 rd = vec3(uv, 1.0);
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vec3 p = vec3(0.0);
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float t = 0.;
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for (int i = 0; i < 64; i++) {
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p = ro + rd * t;
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p.xz *= rotate(p.y * 6.28 * 0.5 + time * 0.5);
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vec2 q = vec2(length(p.xy) - 1., p.z);
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float d = length(q) - .1;
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d = min(d, length(p.xz) - (.3 - .2 * sin(time + p.y * 6.28 * 0.5)));
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t += 0.5 * d;
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col += .15 / (1. + t * t * t * 0.8);
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}
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gl_FragColor = vec4(col, 1.);
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}
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