Shell sript to build glshim and and run games with it on Raspberry Pi

glshim.sh

#!/bin/sh
# Original author: Hiradur
# License: CC0
# Purpose: Build and update glshim, glues and TinyGLES, set up correct paths for programs

set -eu  # stop script on errors
GLWRAPPER_INSTALL_DIR=~/glwrapper  # source code and binary files will be placed here

# if no arguments are given
# download/update glshim, glues and tinygles code and compile
if [ $# = 0 ]; then
  echo "Attempting to build glshim and glues"
  echo "Make sure you are connected to the internet and"
  echo "cmake and libx11-dev are installed (sudo apt-get install cmake libx11-dev)"

  if [ ! -e "$GLWRAPPER_INSTALL_DIR" ]; then
    mkdir -p $GLWRAPPER_INSTALL_DIR
  fi
  

  #### glshim ####
  echo "Building glshim..."

  cd $GLWRAPPER_INSTALL_DIR
  if [ ! -e "glshim" ]; then
    echo "Downloading glshim source code..."
    git clone https://github.com/lunixbochs/glshim.git  # download glshim source code if not present
  fi
  cd glshim

  echo "switching to unstable-branch..."
  git checkout unstable # switch to unstable branch

  echo "checking for updates..."
  git pull              # check for updates

  echo "starting build..."
  # configure build
  cmake .               # configure build
  make GL -j4           # compile



  #### glues ####
  echo "Building glues..."

  cd $GLWRAPPER_INSTALL_DIR

  if [ ! -e "glues" ]; then
    echo "Downloading glues source code..."
    git clone https://github.com/lunixbochs/glues.git
  fi

  cd glues

  echo "switching to glu-branch..."
  git checkout glu

  echo "checking for updates..."
  git pull      

  # copy gl header files from glshim
  if [ ! -e "include/GL" ]; then
    mkdir include/GL
  fi
  cp -r $GLWRAPPER_INSTALL_DIR/glshim/include/GL/* include/GL

  echo "starting build..."
  cmake .              
  make -j4             



  #### TinyGLES ####
  # Only available on RPi2 (armv7)
  if  [ $(grep -c ARMv7 /proc/cpuinfo) > 0 ]; then
    cd ${GLWRAPPER_INSTALL_DIR}
    if [ ! -e "tinygles" ]; then
      echo "Downloading TinyGLES source code..."
      git clone https://github.com/lunixbochs/tinygles.git
    fi
    cd tinygles
    echo "checking for updates..."
    git pull
    cmake .
    make -j4
  fi


  echo "$(tput setaf 2)All libraries were successfully built$(tput sgr 0)"

else # arguments received, set up paths and start game
  echo "Starting game $1"

  LD_LIBRARY_PATH=${GLWRAPPER_INSTALL_DIR}/glshim/lib:${GLWRAPPER_INSTALL_DIR}/glues

  # use TinyGLES as renderer if argument is set
  if [ "$#" -ne 1 ]; then
      echo "using TinyGLES software renderer"
      LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${GLWRAPPER_INSTALL_DIR}/tinygles/lib
  fi

  # make LD_LIBRARY_PATH available to subprocesses (ie the game)
  export LD_LIBRARY_PATH

  # start the game
  $1
fi