update servicepoint and README

README.md

@@ -1,62 +1,12 @@
-# CCCB-Tanks
+# servicepoint-tanks
 
 <!-- TODO: image -->
 
-## Service point display
-
-<!-- TODO: image -->
-
-In CCCB, there is a big pixel matrix hanging on the wall. It is called "Airport Display" or "Service Point Display".
-
-- Resolution: 352x160=56,320 pixels
-- Pixels are grouped into 44x20=880 tiles (8x8=64 pixels each)
-- Smallest addressable unit: row of pixels inside of a tile (8 pixels = 1 byte)
-- The brightness can only be set per tile
-- Screen content can be changed using a simple UDP protocol
-- Between each row of tiles, there is a gap of around 4 pixels size. This gap changes the aspect ratio of the display.
-
-### Binary format
-
-A UDP package sent to the display has a header size of 10 bytes.
-Each header value has a size of two bytes (unsigned 16 bit integer).
-Depending on the command, there can be a payload following the header.
-
-The commands are implemented in DisplayCommands.
-
-To change screen contents, these commands are the most relevant:
-1. Clear screen
-    - command: `0x0002`
-    - (rest does not matter)
-2. Send CP437 data: render specified text into rectangular region
-    - command: `0x0003`
-    - top left tile x
-    - top left tile y
-    - width in tiles
-    - height in tiles
-    - payload: (width in tiles * height in tiles) bytes
-        - 1 byte = 1 character
-        - each character is rendered into one tile (mono-spaced)
-        - characters are encoded using code page 437
-3. Send bitmap window: set pixel states for a rectangular region
-   - command: `0x0013`
-   - top left tile x
-   - top left _pixel_ y
-   - width in tiles
-   - height in _pixels_
-   - payload: (width in tiles * height in pixels) bytes
-     - network byte order
-     - 1 bit = 1 pixel
-
-There are other commands implemented as well, e.g. for changing the brightness.
-
-## Tanks game
-
-- By default, the backend also hosts the frontend
-
 ### Backend
 
 <!-- TODO: image -->
 
+- Uses the C# bindings from the [servicepoint library](https://github.com/cccb/servicepoint/) for communication with the display.
 - Stack: .NET / C# / ASP.NET / AOT-compiled
 - Both traditional JSON over HTTP APIs and real-time WebSocket communication
 - runs all game logic
@@ -66,6 +16,7 @@ There are other commands implemented as well, e.g. for changing the brightness.
 - One frame is ~7KB, not including the text and player specific data
 - maps can be loaded from png files containing black and white pixels or simple text files
 - some values (like tank speed) can be configured but are fixed at run time
+- By default, the backend also hosts the frontend
 
 ### Frontend