tidying detour + usb rcording + a few other small bits

Shaders/1-input/invert_effect.frag

@@ -0,0 +1,15 @@
+//1-input
+//written by Tim Caldwell
+// this is a simple example of how to change incoming textures colour
+varying vec2 v_texcoord;
+uniform sampler2D u_tex0;
+uniform vec2 u_resolution;
+uniform float u_time;
+uniform float u_x0;
+uniform float u_x1;
+uniform float u_x2;
+
+void main() {
+    vec4 texColour = texture2D(u_tex0, v_texcoord);
+    gl_FragColor = vec4(1.0 - u_x0 - texColour.r,1.0 -u_x1-texColour.g,1.0 - u_x2-texColour.b,texColour.a);
+}