if [ "$OPENGL" = no ]; then
  OPENGL_SUPPORT="no"
else
  OPENGL_SUPPORT="yes"
fi

if [ "$OPENGLES" = no ]; then
  OPENGLES_SUPPORT="no"
else
  OPENGLES_SUPPORT="yes"
fi

get_graphicdrivers() {

  # set defaults
  GALLIUM_DRIVERS=""
  DRI_DRIVERS=""
  XORG_DRIVERS=""
  LLVM_SUPPORT="no"
  COMPOSITE_SUPPORT="no"
  VDPAU_SUPPORT="no"
  VAAPI_SUPPORT="no"
  V4L2_SUPPORT="no"

  if [ "$GRAPHIC_DRIVERS" = "all" ]; then
    GRAPHIC_DRIVERS="i915 i965 r200 r300 r600 radeonsi nvidia nvidia-legacy vmware virtio vc4"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "i915"; then
    DRI_DRIVERS="$DRI_DRIVERS,i915"
    XORG_DRIVERS="$XORG_DRIVERS intel"
    COMPOSITE_SUPPORT="yes"
    VAAPI_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "i965"; then
    DRI_DRIVERS="$DRI_DRIVERS,i965"
    XORG_DRIVERS="$XORG_DRIVERS intel"
    COMPOSITE_SUPPORT="yes"
    VAAPI_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "nvidia"; then
    XORG_DRIVERS="$XORG_DRIVERS nvidia"
    VDPAU_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "nvidia-legacy"; then
    XORG_DRIVERS="$XORG_DRIVERS nvidia-legacy"
    VDPAU_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "r200"; then
    DRI_DRIVERS="$DRI_DRIVERS,r200"
    XORG_DRIVERS="$XORG_DRIVERS ati"
    COMPOSITE_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "r300"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,r300"
    XORG_DRIVERS="$XORG_DRIVERS ati"
    LLVM_SUPPORT="yes"
    COMPOSITE_SUPPORT="yes"
    VDPAU_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "r600"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,r600"
    XORG_DRIVERS="$XORG_DRIVERS ati"
    LLVM_SUPPORT="yes"
    COMPOSITE_SUPPORT="yes"
    VDPAU_SUPPORT="yes"
    VAAPI_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "radeonsi"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,radeonsi"
    XORG_DRIVERS="$XORG_DRIVERS ati amdgpu"
    LLVM_SUPPORT="yes"
    COMPOSITE_SUPPORT="yes"
    VDPAU_SUPPORT="yes"
    VAAPI_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "vmware"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,svga"
    XORG_DRIVERS="$XORG_DRIVERS vmware"
    COMPOSITE_SUPPORT="yes"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "virtio"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,virgl"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "vc4"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,vc4"
    V4L2_SUPPORT="yes"
    VAAPI_SUPPORT="no"
    VDPAU_SUPPORT="no"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "freedreno"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,freedreno"
    V4L2_SUPPORT="yes"
    VAAPI_SUPPORT="no"
    VDPAU_SUPPORT="no"
  fi

  if listcontains "$GRAPHIC_DRIVERS" "etnaviv"; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,etnaviv,imx"
    V4L2_SUPPORT="yes"
    VAAPI_SUPPORT="no"
    VDPAU_SUPPORT="no"
  fi

  # remove leading comma if present
  [[ $GALLIUM_DRIVERS =~ ^, ]] && GALLIUM_DRIVERS="${GALLIUM_DRIVERS:1}"
  [[ $DRI_DRIVERS =~ ^, ]] && DRI_DRIVERS="${DRI_DRIVERS:1}"

  # remove duplicate entries
  XORG_DRIVERS="$(echo $XORG_DRIVERS | xargs -n1 | sort -u | xargs)"
}