From c904706a6b7af010f9a9b6838ef4bd1433198f8a Mon Sep 17 00:00:00 2001
From: rogerman <rogerman@users.noreply.github.com>
Date: Wed, 18 May 2022 12:44:00 -0700
Subject: [PATCH] Cocoa Port: If default.metallib is missing or corrupted in
 the app bundle, then fail running Metal video output and fall back to using
 OpenGL instead.

---
 .../cocoa/userinterface/MacMetalDisplayView.mm       | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/desmume/src/frontend/cocoa/userinterface/MacMetalDisplayView.mm b/desmume/src/frontend/cocoa/userinterface/MacMetalDisplayView.mm
index 33af2728a..8f8c7498e 100644
--- a/desmume/src/frontend/cocoa/userinterface/MacMetalDisplayView.mm
+++ b/desmume/src/frontend/cocoa/userinterface/MacMetalDisplayView.mm
@@ -61,9 +61,17 @@
 	}
 	
 	device = MTLCreateSystemDefaultDevice();
-	
 	if (device == nil)
 	{
+		NSLog(@"Metal: A Metal device could not be found.");
+		[self release];
+		return nil;
+	}
+	
+	defaultLibrary = [device newDefaultLibrary];
+	if (defaultLibrary == nil)
+	{
+		NSLog(@"Metal: The default.metallib could not be loaded!");
 		[self release];
 		return nil;
 	}
@@ -103,8 +111,6 @@
 	_fetchCommandQueue = [device newCommandQueue];
 	[_fetchCommandQueue setLabel:@"CQ_DeSmuME_FramebufferFetch"];
 	
-	defaultLibrary = [device newDefaultLibrary];
-	
 	MTLComputePipelineDescriptor *computePipelineDesc = [[MTLComputePipelineDescriptor alloc] init];
 	[computePipelineDesc setThreadGroupSizeIsMultipleOfThreadExecutionWidth:YES];