[resources] add utilities

Author: mugulmd

resources/utils.glsl

@@ -5,3 +5,25 @@
 vec2 uv = gl_FragCoord.xy / resolution;
 uv = 2.0 * uv - 1.0;
 uv.x *= resolution.x / resolution.y;
+
+
+mat2 rot(float a) {
+    float c = cos(a);
+    float s = sin(a);
+    return mat2(c, -s, s, c);
+}
+
+
+float rand(vec2 s) {
+    return fract(sin(dot(s, vec2(1321.1241, 125.2134)) * 74.57));
+}
+
+
+ivec2 pixelate(vec2 uv, float size) {
+    return ivec2(floor(uv / size));
+}
+
+
+float gyroid(vec3 p) {
+    return dot(sin(p), cos(p.yzx));
+}