qemu: Add gl option to SDL graphics command line

Support OpenGL when using SDL backend via -sdl,gl=on. Add associated
tests.

NB: Usage of DO_TEST_CAPS_LATEST in qemuxml2argv doesn't work in
this case because -sdl gl is not introspectable.
Signed-off-by: NMaciej Wolny <maciej.wolny@codethink.co.uk>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -7616,6 +7616,10 @@ qemuBuildGraphicsSDLCommandLine(virQEMUDriverConfigPtr cfg ATTRIBUTE_UNUSED,
                                 virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED,
                                 virDomainGraphicsDefPtr graphics)
 {
+    int ret = -1;
+    virBuffer opt = VIR_BUFFER_INITIALIZER;
+    const char *optContent;
+
     if (graphics->data.sdl.xauth)
         virCommandAddEnvPair(cmd, "XAUTHORITY", graphics->data.sdl.xauth);
     if (graphics->data.sdl.display)
@@ -7631,7 +7635,26 @@ qemuBuildGraphicsSDLCommandLine(virQEMUDriverConfigPtr cfg ATTRIBUTE_UNUSED,
     virCommandAddEnvPassBlockSUID(cmd, "SDL_AUDIODRIVER", NULL);
 
     virCommandAddArg(cmd, "-sdl");
-    return 0;
+
+    if (graphics->data.sdl.gl == VIR_TRISTATE_BOOL_YES) {
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SDL_GL)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("This QEMU doesn't support SDL OpenGL"));
+            goto cleanup;
+        }
+
+        virBufferAsprintf(&opt, "gl=%s",
+                          virTristateSwitchTypeToString(graphics->data.sdl.gl));
+    }
+
+    optContent = virBufferCurrentContent(&opt);
+    if (optContent && STRNEQ(optContent, ""))
+        virCommandAddArgBuffer(cmd, &opt);
+
+    ret = 0;
+ cleanup:
+    virBufferFreeAndReset(&opt);
+    return ret;
 }
 
 

tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off \
+-m 1024 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/var/lib/libvirt/images/QEMUGuest1,format=qcow2,if=none,\
+id=drive-ide0-0-0,cache=none \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-sdl gl=on \
+-device virtio-gpu-pci,id=video0,virgl=on,bus=pci.0,addr=0x2 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvtest.c

@@ -1927,6 +1927,11 @@ mymain(void)
             QEMU_CAPS_SPICE_GL,
             QEMU_CAPS_SPICE_RENDERNODE,
             QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
+    DO_TEST("video-virtio-gpu-sdl-gl",
+            QEMU_CAPS_DEVICE_VIRTIO_GPU,
+            QEMU_CAPS_VIRTIO_GPU_VIRGL,
+            QEMU_CAPS_SDL_GL,
+            QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
     DO_TEST("video-virtio-gpu-secondary",
             QEMU_CAPS_DEVICE_VIRTIO_GPU,
             QEMU_CAPS_DEVICE_VIDEO_PRIMARY);