92 lines
2.0 KiB
Plaintext
92 lines
2.0 KiB
Plaintext
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in vec2 v_uv;
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in float v_aa;
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in float v_range;
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in vec2 v_period;
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in vec4 v_color;
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out vec4 o_color;
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vec2 uv_;
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float len_;
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float theta_;
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float atan2(in vec2 p) {
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return p.x == 0.? PI/2.*sign(p.y): atan(p.y, p.x);
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}
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float thetadist(in vec2 p, in float t) {
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float a = tan(t);
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float b = 1.;
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if (cos(t) == 0.) {
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a = 1.;
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b = 0.;
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}
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return abs(b*p.y-a*p.x)/sqrt(a*a+b*b);
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}
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float grid(in float n, in float ri, in float ro) {
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float u = PI/n;
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float t = floor(theta_/u)*u;
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float d = min(thetadist(uv_, t), thetadist(uv_, t+u));
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return
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step(ri, len_)*step(len_, ro)*
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smoothstep(v_aa, .0, d);
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}
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float belt(in float t1, in float t2, in float r) {
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float t1a = smoothstep(v_aa, 0., thetadist(uv_, t1))*step(abs(theta_-t1), .1);
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float t2a = smoothstep(v_aa, 0., thetadist(uv_, t2))*step(abs(theta_-t2), .1);
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float a = t1a + t2a + step(t1, theta_)*step(theta_, t2);
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a *=
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(t1a + t2a)*smoothstep(.4, .45, len_) +
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smoothstep(r-v_aa, r, len_)*
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(1.-max(len_-r, 0.)/.2) +
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smoothstep(v_aa, 0., abs(len_-.7*r));
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return clamp(a, 0., 1.);
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}
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float circle(in float r) {
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return
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smoothstep(v_aa, 0., abs(len_-r));
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}
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float clockhand(in float t) {
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float r = smoothstep(.25, .3, len_)*smoothstep(1., .85, len_);
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float a =
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r *
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smoothstep(v_aa, 0., thetadist(uv_, t)) *
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step(abs(theta_-t), .1);
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float b =
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r * max(1.-abs(theta_-t)/(PI/12.), 0.)*.7;
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return a + b;
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}
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void main(void) {
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uv_ = v_uv.yx;
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len_ = length(uv_);
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theta_ = atan2(uv_);
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theta_ = theta_ < 0.? theta_+2.*PI: theta_;
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if (v_range <= -1.) {
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o_color = v_color;
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float a =
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grid( 2., .4, 1.) +
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grid(60., .75, .8) +
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grid(10., .65, .8) +
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grid(8., .5, .55) +
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grid( 4., .3, .4) +
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circle(.8);
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o_color.a *= clamp(a, 0., 1.);
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} else if (v_range <= 0.) {
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o_color = v_color*clockhand(v_period.x*PI*2.);
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o_color.a = pow(o_color.a, 2.);
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} else {
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o_color = v_color;
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o_color.a *= belt(v_period.x*PI*2., v_period.y*PI*2., v_range);
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}
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}
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