From 8d57d5399bf69379851902766af927a2983b3cbd Mon Sep 17 00:00:00 2001
From: Stephen Saunders <srsaunders@rogers.com>
Date: Mon, 14 Nov 2022 23:38:55 -0500
Subject: [PATCH] Skip GL_BlockingSwapBuffers() sync during shutdown when in
 Doom 3 mode (com_smp = -1)

---
 neo/renderer/RenderSystem_init.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/neo/renderer/RenderSystem_init.cpp b/neo/renderer/RenderSystem_init.cpp
index 7db1f552..a2d9287c 100644
--- a/neo/renderer/RenderSystem_init.cpp
+++ b/neo/renderer/RenderSystem_init.cpp
@@ -2245,6 +2245,8 @@ idRenderSystemLocal::Shutdown
 */
 void idRenderSystemLocal::Shutdown()
 {
+	extern idCVar com_smp;
+
 	common->Printf( "idRenderSystem::Shutdown()\n" );
 
 	fonts.DeleteContents();
@@ -2270,7 +2272,11 @@ void idRenderSystemLocal::Shutdown()
 	UnbindBufferObjects();
 
 	// SRS - wait for fence to hit before freeing any resources the GPU may be using, otherwise get Vulkan validation layer errors on shutdown
-	backend.GL_BlockingSwapBuffers();
+	// SRS - skip this step if we are in Doom 3 mode (com_smp = -1) which has already finished and presented
+	if( com_smp.GetInteger() != -1 )
+	{
+		backend.GL_BlockingSwapBuffers();
+	}
 
 	// free the vertex cache, which should have nothing allocated now
 	vertexCache.Shutdown();