From 3d5340d033dae3f459a777022c199daa32e4e17d Mon Sep 17 00:00:00 2001
From: Tom <tomut@yahoo.com>
Date: Fri, 25 Jun 2021 13:49:20 -0600
Subject: [PATCH] Meta: Add SERENITY_SCREENS environment variable

This allows specifying how many screens we should use. This also then
only enables virtio-gpu if more than one display is requested.

This also adds an environment variable SERENITY_QEMU_DISPLAY_BACKEND
which allows overriding the default qemu display backend, as it may
not be available.
---
 Meta/run.sh | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/Meta/run.sh b/Meta/run.sh
index 5f1cfe5144b..e771290690a 100755
--- a/Meta/run.sh
+++ b/Meta/run.sh
@@ -53,14 +53,22 @@ SERENITY_QEMU_MIN_REQ_VERSION=5
 installed_major_version=$("$SERENITY_QEMU_BIN" -version | head -n 1 | sed -E 's/QEMU emulator version ([1-9][0-9]*|0).*/\1/')
 [ "$installed_major_version" -lt "$SERENITY_QEMU_MIN_REQ_VERSION" ] && die "Required QEMU >= 5.0! Found $($SERENITY_QEMU_BIN -version | head -n 1)"
 
+SERENITY_SCREENS="${SERENITY_SCREENS:-1}"
+SERENITY_QEMU_DISPLAY_BACKEND="${SERENITY_QEMU_DISPLAY_BACKEND:-sdl,gl=on}"
+if [ "$SERENITY_SCREENS" -gt 1 ]; then
+    SERENITY_QEMU_DISPLAY_DEVICE="virtio-gpu,max_outputs=$SERENITY_SCREENS "
+else
+    SERENITY_QEMU_DISPLAY_DEVICE="VGA,vgamem_mb=64 "
+fi
+
 [ -z "$SERENITY_COMMON_QEMU_ARGS" ] && SERENITY_COMMON_QEMU_ARGS="
 $SERENITY_EXTRA_QEMU_ARGS
 -s -m $SERENITY_RAM_SIZE
 -cpu $SERENITY_QEMU_CPU
 -d guest_errors
 -smp 2
--display sdl,gl=on
--vga virtio
+-display $SERENITY_QEMU_DISPLAY_BACKEND
+-device $SERENITY_QEMU_DISPLAY_DEVICE
 -drive file=${SERENITY_DISK_IMAGE},format=raw,index=0,media=disk
 -usb
 -device virtio-serial
@@ -83,8 +91,8 @@ $SERENITY_EXTRA_QEMU_ARGS
 -machine q35
 -d guest_errors
 -smp 2
--display sdl,gl=on
--vga virtio
+-display $SERENITY_QEMU_DISPLAY_BACKEND
+-device $SERENITY_QEMU_DISPLAY_DEVICE
 -device piix3-ide
 -drive file=${SERENITY_DISK_IMAGE},id=disk,if=none
 -device ahci,id=ahci