Add WIP shaders

cities-are-old-forests.glsl

@@ -0,0 +1,24 @@
+#pragma map iChannel0=video:/home/polyfloyd/Documents/Projects/Text Smilies/Lenny Face Challenge/LENNY FACE TAG Shubble lO82ggwCnAQ.webm
+
+float zigzag(float n) {
+    // 1.33 should be 1.0 for real zigzag
+    return abs(mod(n,2.0)-1.33);
+}
+void mainImage( out vec4 O, in vec2 uv ) {
+	uv /= iResolution.y;
+    uv.x -= .5*iResolution.x/iResolution.y;
+    uv.y -= .5;
+    float l = length(uv) + .2 * sin(iTime * .21);
+    float a = atan(uv.y, uv.x)/3.14159 + sin(l + iTime * .1);
+    uv.x = zigzag(a * 3.);
+    uv.y = zigzag(l * 5.);
+
+    // darkening radial waves
+    float bri = (1. + .5 * sin(l * 5. - iTime));
+    vec4 c = texture(iChannel0, uv) * bri;
+
+    // colorize
+    c *= vec4(10., 17., 1.8, 1.);
+    c = .5+.5*sin(c);
+	O = c;
+}