====== Pixelrinnsal ======

Less is more: Pixelflut with a canvas of 346 x 196 pixels and a 100 Mbit/s link. //Use less bandwidth!// :D

===== Where to watch =====

Hackcenter K6, near the entrance: [[https://eh22.c3nav.de/l/c:0:220.25:187.66/|see on c3nav]]

===== How to rinn =====

Pixelrinnsal utilises the [[https://entropia.de/GPN17:Pingxelflut#Format|Pingxelflut "protocol" (de)]], which encodes position and colour in an IPv6 address. To set a pixel, one simply has to send an IPv6 packet to the corresponding address.

The format of the addresses is as follows:

  2a07:c483:100:241:0023:0042:ff00:ff00
  \______  _______/ XXXX YYYY RRGG BBPP  XXXX = X coordinate, starting at 0 (big-endian)
         \/                              YYYY = Y coordinate, starting at 0 (big-endian)
       prefix                            RR   = Red channel
                                           GG = Green channel
                                         BB   = Blue channel
                                           PP = Padding (ignored)

In this example, the pixel at X=23, Y=42 is set to #ff00ff.

**Note:** Pixelrinnsal //does not send responses//, i.e. ping requests are not answered and TCP connections do not work.