add Dockerfile and README

.dockerignore

@@ -0,0 +1 @@
+build/

Dockerfile

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+# syntax=docker/dockerfile:1.5
+# vim:ft=dockerfile
+#
+# Author: oxmox
+#
+# To build the image:
+#
+#   docker build --progress plain -t doompanning:latest .
+#
+# To run doompanning (xhost +, so it's insecure):
+#
+#   xhost +
+#   docker container run -it -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix doompanning
+#
+# and for nyan cats:
+#
+#   docker container run -it -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix --entrypoint /build/sdl_nyan_demo doompanning
+
+FROM debian:stable as build
+
+ENV DEBIAN_FRONTEND="noninteractive"
+ENV TZ="Etc/UTC"
+
+RUN sed -i -e's/ main/ main contrib non-free/g' /etc/apt/sources.list.d/debian.sources && \
+    apt-get update && apt-get install -y --no-install-recommends \
+    bash build-essential git cmake ninja-build ca-certificates \
+    libsdl2-dev:amd64 doom-wad-shareware
+
+COPY . /src/
+WORKDIR /build/
+RUN cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/install /src/
+RUN cmake --build . --target all
+
+ENTRYPOINT [ "/build/doompanning" ]

README.md

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-= doompanning
+# doompanning
+
+## Requirements
+
+gcc/clang, cmake, ninja, sdl2, doom shareware
+
+See [Dockerfile](Dockerfile) for details.
+
+## State
+
+Input forwarding to the dooms is currently broken or at least in a bad state.
+Was trying out something, not sure.