document ideas, add readme img

IDEAS.md

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+# feature ideas
+- pluggable cli: commands for image, text, shader rendering
+- support animations / frame concept
+- visualization client
+- CnC: server distributes jobs to connected clients
+- webassembly port?
+
+# performance considerations
+- server limitations: rendering is bottleneck. maybe artificial limitations (commands per draw, connections per IP, queue)
+  - when network isn't bottleneck: fetch each pixel & only send updates for wrong color (?)
+  - sync sending with draw frequency (?)
+  - use virtual subnets for more IPs (ipv6?) (?)
+- client limitations: PCI bus is bottleneck? depends on HW I guess
+  - precompute everything
+  - distribute across cores for max PCI bus saturation (?)
+- network limitations: packet size, ACKs, congestion
+  - treat benchmarks on `loopback` with care, it has no packet size limitation. real world interfaces will enforce a max size of 1514 bytes [1]
+  - avoid packet split if >1514B (?)
+  - use `TCP_NODELAY` (?)
+  - https://stackoverflow.com/questions/5832308/linux-loopback-performance-with-tcp-nodelay-enabled
+- cognitive limitations: draw order
+  - randomized pixel order should give a better idea of the image with equal dominance (?)
+
+# concept: CLI for distributed hochwasser v2
+
+> pixelflut endlich *durchgespielt*
+
+```
+hochwasser     --server
+    provide    [type] [input] --effect --offset --scale --port --nosend
+    subscribe  --connections --shuffle --diffmode
+    view       --fullscreen
+```
+
+- CLI via `github.com/spf13/cobra`
+  - `--server` refers to pixelflut server or hochwasser jobprovider, depending on mode
+
+- jobprovider has different input types (`image`, `text`, `shader`?), each is parsed into an `image.GIF`
+  - jobprovider also sends image itself?
+
+- when subscriber connects to jobprovider, `GIF` is split up, and (re)distributed to all subscribers
+  - protocol: (address,offset,imgdata) serialized with `gob`?
+
+- viewer fetches into framebuffer, renders via opengl?

README.md

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-# 🌊🌊🌊 Hochwasser 🌊🤽🌊
+<h1 align="center" >🌊🌊🌊 Hochwasser 🌊🤽🌊</h1>
+<p align="center"><img src="benchmarks/hochwasser_shuffle_vs_ordered.gif"/></p>
+
 Highly efficient client for [Pixelflut]:
 Faster than [sturmflut]!