#---
## glselect - select default libGL provider
## rewritten from smgl-gl_select
##
## this is run in FINAL and will always set the provider
## based on the final spell cast that calls this.
## If one wants to have this settable runtime then
## there's the smgl-gl_select tool to do so
##
#---

function glselect(){
  local file_list="
                    /usr/lib/libGL.so
                    /usr/lib/libGL.so.*
                    /usr/lib/xorg/modules/extensions/libdri.la
                    /usr/lib/xorg/modules/extensions/libdri.so
                    /usr/lib/xorg/modules/extensions/libglx.la
                    /usr/lib/xorg/modules/extensions/libglx.so*
                    /usr/include/GL/gl.h
                    /usr/include/GL/glext.h
                    /usr/include/GL/glx.h
                    /usr/include/GL/glxext.h
                   "
  local dir_list=( \
                  "/usr/lib/.ati" \
                  "/usr/lib/.nvidia" \
                  "/usr/lib/.mesa" \
                  "/usr/include/GL/.ati" \
                  "/usr/include/GL/.nvidia" \
                  "/usr/include/GL/.mesa" \
                  "/usr/lib/xorg/modules/extensions/.ati" \
                  "/usr/lib/xorg/modules/extensions/.nvidia" \
                  "/usr/lib/xorg/modules/extensions/.mesa" \
                 )
  local rm_file orig_dir
  local gl_lib=$1
  message "Selecting $gl_lib as the default system GL library"
  if [[ -L ${INSTALL_ROOT}/usr/lib/libGL.so ]] ||
     [[ ! -e ${INSTALL_ROOT}/usr/lib/libGL.so ]]
  then
    message "Cleaning all previous GL providers..."
    for rm_file in $file_list
    do
      rm -f $rm_file
      echo -n "."
    done
    echo -n "."
    echo ""
    message "Done."
    message "Setting up new GL provider $gl_lib..."
    case "$1" in
   ati) 
        [[ -e ${INSTALL_ROOT}${dir_list[0]}/libGL.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[0]}/* \
               ${INSTALL_ROOT}/usr/lib/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[3]}/gl.h ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[3]}/* \
               ${INSTALL_ROOT}/usr/include/GL/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[6]}/libglx.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[6]}/* \
               ${INSTALL_ROOT}/usr/lib/xorg/modules/extensions/ 2>/dev/null
        echo -n "."
        ;;
  mesa) 
        [[ -e ${INSTALL_ROOT}${dir_list[2]}/libGL.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[2]}/* \
               ${INSTALL_ROOT}/usr/lib/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[5]}/gl.h ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[5]}/* \
               ${INSTALL_ROOT}/usr/include/GL/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[8]}/libglx.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[8]}/* \
               ${INSTALL_ROOT}/usr/lib/xorg/modules/extensions/ 2>/dev/null
        echo -n "."
        ;;
nvidia) 
        [[ -e ${INSTALL_ROOT}${dir_list[1]}/libGL.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[1]}/* \
               ${INSTALL_ROOT}/usr/lib/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[4]}/gl.h ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[4]}/* \
               ${INSTALL_ROOT}/usr/include/GL/ 2>/dev/null
        [[ -e ${INSTALL_ROOT}${dir_list[7]}/libglx.so ]] &&
        ln -sf ${INSTALL_ROOT}${dir_list[7]}/* \
               ${INSTALL_ROOT}/usr/lib/xorg/modules/extensions/ 2>/dev/null
        echo -n "."
        ;;
     *) message "Unknown secondary files so I only linked the libGL.so"
        ln -fs ${INSTALL_ROOT}/usr/lib/$gl_lib/libGL.so* \
               ${INSTALL_ROOT}/usr/lib/ 2>/dev/null
        ;;
      esac
    echo -e "\nDone."
    message "You can manage the libGL providers at runtime by using"
    message "either smgl-gl_select or manually by symlinking the files"
    message "from their respective directories i.e.:"
    message "/usr/lib/.[nvidia|ati|mesa]/libGL.so"
    message "/usr/lib/xorg/modules/extensions/.[nvidia,ati,mesa]/lib{glx,dri}.so"
    message "/usr/include/GL/.[nvidia|ati|mesa]/gl{x,xext,ext}.h"
    message ""
    message "To:"
    message "/usr/lib/libGL.so"
    message "/usr/lib/xorg/modules/extensions/lib{glx,dri}.so"
    message "/usr/include/GL/gl{x,xext,ext}.h"
    message ""
    return 0
  else
    message "Error ${INSTALL_ROOT}/usr/lib/libGL.so is not a symlink"
    message "unable to proceed!!!"
    message "Please recast:"
    message "mesalib, xorg-server and whatever GL driver you use."
    message ""
    message "If this continues to happen please file a bug."
    message ""
    return 1
  fi
}