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75 lines
2.1 KiB
GLSL
75 lines
2.1 KiB
GLSL
// Author @kynd - 2016
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// http://www.kynd.info
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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float smoothedge(float v) {
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return smoothstep(0.0, 1.0 / u_resolution.x, v);
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}
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float circle(vec2 p, float radius) {
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return length(p) - radius;
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}
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float rect(vec2 p, vec2 size) {
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vec2 d = abs(p) - size;
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return min(max(d.x, d.y), 0.0) + length(max(d,0.0));
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}
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float roundRect(vec2 p, vec2 size, float radius) {
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vec2 d = abs(p) - size;
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return min(max(d.x, d.y), 0.0) + length(max(d,0.0))- radius;
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}
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float ring(vec2 p, float radius, float width) {
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return abs(length(p) - radius * 0.5) - width;
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}
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float hexagon(vec2 p, float radius) {
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vec2 q = abs(p);
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return max(abs(q.y), q.x * 0.866025 + q.y * 0.5) - radius;
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}
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float triangle(vec2 p, float size) {
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vec2 q = abs(p);
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return max(q.x * 0.866025 + p.y * 0.5, -p.y * 0.5) - size * 0.5;
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}
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float ellipse(vec2 p, vec2 r, float s) {
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return (length(p / r) - s);
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}
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float capsule(vec2 p, vec2 a, vec2 b, float r) {
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vec2 pa = p - a, ba = b - a;
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float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
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return length( pa - ba*h ) - r;
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}
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//http://thndl.com/square-shaped-shaders.html
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float polygon(vec2 p, int vertices, float size) {
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float a = atan(p.x, p.y) + 0.2;
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float b = 6.28319 / float(vertices);
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return cos(floor(0.5 + a / b) * b - a) * length(p) - size;
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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float d = circle(st - vec2(0.2), 0.1);
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d = min(d, rect(st - vec2(0.5, 0.2), vec2(0.1, 0.08)));
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d = min(d, roundRect(st - vec2(0.8, 0.2), vec2(0.08, 0.06), 0.02));
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d = min(d, ring(st - vec2(0.2, 0.5), 0.18, 0.02));
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d = min(d, hexagon(st - vec2(0.5, 0.5), 0.1));
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d = min(d, triangle(st - vec2(0.8, 0.5), 0.1));
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d = min(d, ellipse(st - vec2(0.2, 0.8), vec2(0.9, 1.2), 0.1));
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d = min(d, capsule(st - vec2(0.5, 0.8), vec2(-0.05, -0.05), vec2(0.05, 0.05), 0.05));
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d = min(d, polygon(st - vec2(0.8, 0.8), 5, 0.1));
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vec3 color = vec3(smoothedge(d));
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gl_FragColor = vec4(color, 1.0);
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} |