/* Vertical scale, larger values will amplify output */
#define VSCALE 450
/* Rendering direction, either -1 (outwards) or 1 (inwards). */
#define DIRECTION 1
/* Smoothing factor, in normalized width */
#define SMOOTH 0.008

/* The `RCOL_OFF`, `LCOL_OFF` AND `LSTEP` definitions are used to calculate
   the `COLOR` macro definition for output. You can remove all these values
   any simply define the `COLOR` macro yourself. */

/* right color offset */
#define RCOL_OFF (gl_FragCoord.x / 3000)
/* left color offset */
#define LCOL_OFF ((screen.x - gl_FragCoord.x) / 3000)
/* vertical color step */
#define LSTEP (pos / 170)
/* actual color definition */
#define COLOR vec4((0.3 + RCOL_OFF) + LSTEP, 0.6 - LSTEP, (0.3 + LCOL_OFF) + LSTEP, 1)
/* outline color */
#define OUTLINE vec4(0.15, 0.15, 0.15, 1)
/* 1 to invert (vertically), 0 otherwise */
#define INVERT 0
/* How many frames to queue and run through the average function */
#request setavgframes 6
/* Whether to window frames ran through the average function (new & old frames
   are weighted less). This massively helps smoothing out spikes in the animation */
#request setavgwindow true
/* Gravity step, higher values means faster drops. The step is applied in a rate
   independant method like so:
   
   val -= (gravitystep) * (seconds per update) */
#request setgravitystep 5.2