refactor: split frag0 into multiple files

default/inc_time.glsl

@@ -0,0 +1,49 @@
+#ifndef PI
+#define PI 3.1415927
+#endif
+
+#include inc_rand.glsl
+
+#ifndef INC_TIME
+#define INC_TIME
+
+uniform float iTime;
+uniform float iTempo;
+uniform float iBeats;
+
+float randTime(float seed){
+    return rand(seed + floor(iBeats / 4));
+}
+
+float divider(float x)
+{
+    if (x < 0.1) return 0;
+    if (x < 0.2) return 0.125;
+    if (x < 0.3) return 0.25;
+    if (x < 0.4) return 0.5;
+    if (x < 0.6) return 1;
+    if (x < 0.8) return 2;
+    return 4;
+}
+
+float modTime(float k, float k2)
+{
+    return mod(divider(k) * iBeats * k2 / 4, 1);
+}
+
+float modTime(float k)
+{
+    return modTime(k, 1.0);
+}
+
+float sinTime(float k)
+{
+    return sin(modTime(k, 0.5) * 2 * PI);
+}
+
+float cosTime(float k)
+{
+    return cos(modTime(k, 0.5) * 2 * PI);
+}
+
+#endif