Brendan Shanks : winemac.drv: Fix crash when building against Metal-capable SDK but running on older OS X.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d52c4eb00ca0a0374bef81a1d794026f41399b19
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=d52c4eb00ca0a0374bef81a1d...

Author: Brendan Shanks <bshanks(a)codeweavers.com>
Date:   Wed Mar 10 15:25:20 2021 -0800

winemac.drv: Fix crash when building against Metal-capable SDK but running on older OS X.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50790
Signed-off-by: Brendan Shanks <bshanks(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/winemac.drv/cocoa_display.m | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dlls/winemac.drv/cocoa_display.m b/dlls/winemac.drv/cocoa_display.m
index 7cc6f981fee..05f1c75d53b 100644
--- a/dlls/winemac.drv/cocoa_display.m
+++ b/dlls/winemac.drv/cocoa_display.m
@@ -348,10 +348,15 @@ static int macdrv_get_gpu_info_from_display_id_using_metal(struct macdrv_gpu* gp
     int ret = -1;
     NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
 
+    /* Test if Metal is available */
+    if (&CGDirectDisplayCopyCurrentMetalDevice == NULL)
+        goto done;
+
     device = [CGDirectDisplayCopyCurrentMetalDevice(display_id) autorelease];
     if (device && [device respondsToSelector:@selector(registryID)])
         ret = macdrv_get_gpu_info_from_registry_id(gpu, device.registryID);
 
+done:
     [pool release];
     return ret;
 }