Update for pi 4

Author: jmwohl

install.sh

@@ -25,8 +25,23 @@ if [ $os == "Linux" ]; then
     # sudo apt-get upgrade
 
     if [ $arq == "armv7l" ]; then
-        # on RaspberryPi 2/3
-        sudo apt-get install glslviewer
+        # on RaspberryPi 2/3/4
+
+        # check if it's a pi 4, if so requires a different install
+        rev=$(cat /proc/cpuinfo | grep 'Revision' | awk '{print $3}' | sed 's/^1000//')
+        declare -A pi4
+        pi4[a03111]=1
+        pi4[b03111]=1
+        pi4[c03111]=1
+        if [ ${pi4[$rev]} == 1 ]; then
+            sudo apt-get install libegl1-mesa-dev libgbm-dev libgles2-mesa-dev
+            git clone --depth=1 --branch=master http://github.com/patriciogonzalezvivo/glslViewer glslViewer
+            cd glslViewer
+            make
+            sudo make install
+        else
+            sudo apt-get install glslviewer
+        fi
     elif [ $arq == "armv6l" ]; then
         # on RaspberryPi A/B
         sudo apt-get install glslviewer