Add docker files and build instructions

.dockerignore

@@ -0,0 +1,2 @@
+build
+build-*

.gitignore

@@ -1,2 +1,4 @@
 .idea
-*build*
+build-*
+build
+slowmoFlowBuilder

Dockerfile-ubuntu2004

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+FROM ubuntu:20.04
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y freeglut3-dev libopencv-dev libglew-dev cmake build-essential
+
+RUN apt-get install -y cmake build-essential
+
+WORKDIR /_build
+
+CMD [ "/bin/sh", "./build.sh" ]

Dockerfile-ubuntu2204

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+FROM ubuntu:22.04
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y freeglut3-dev libopencv-dev libglew-dev cmake build-essential
+
+RUN apt-get install -y cmake build-essential
+
+WORKDIR /_build
+
+CMD [ "/bin/sh", "./build.sh" ]

README.md

@@ -7,10 +7,21 @@ It can be used by slowmoVideo.
 
 ## Building
 
-On Ubuntu 20.04, install the requirements `freeglut3-dev libopencv-dev libglew-dev `
+Before building, get the latest version with the following command:
 
 ```bash
+# Get the latest commit of this branch
+git pull --rebase
+
+# Update the libSvFlow submodule to the correct commit
 git submodule update --init
+```
+
+### Ubuntu 20.04
+
+On Ubuntu 20.04, install the requirements `freeglut3-dev libopencv-dev libglew-dev `
+
+```bash
 mkdir build
 cd build
 cmake ..
@@ -20,3 +31,18 @@ make
 # or install:
 sudo make install
 ```
+
+### Docker
+
+You can build slowmoFlowBuilder with Docker for different target systems.
+Currently, Ubuntu 20.04 and Ubuntu 22.04 are supported.
+
+```bash
+# Build the docker image which will build slowmoFlowBuilder
+# For Ubuntu 20.04: use Dockerfile-ubuntu2004 instead
+docker build . -t v3d-builder -f Dockerfile-ubuntu2204
+
+# Build v3d-flow-builder inside the docker image.
+# The executable will be copied to the working directory.
+docker run -it --rm -v $(pwd):/_build -u $(id -u) v3d-builder
+```

build.sh

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+#!/bin/sh
+
+mkdir -p build-docker
+cd build-docker
+cmake ..
+make
+cp src/slowmoFlowBuilder ..