[PATCH 1/1] wined3d: Disable CSMT when running on a single core.

[Anton Baskanov]

From: Anton Baskanov

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45893
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47767
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=44546
---
 dlls/wined3d/cs.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dlls/wined3d/cs.c b/dlls/wined3d/cs.c
index 8ee7e7fccc9..b2f682e9837 100644
--- a/dlls/wined3d/cs.c
+++ b/dlls/wined3d/cs.c
@@ -3431,6 +3431,19 @@ struct wined3d_cs *wined3d_cs_create(struct wined3d_device *device,
         }
     }

+    if (wined3d_settings.cs_multithreaded & WINED3D_CSMT_ENABLE)
+    {
+        DWORD_PTR affinity_mask;
+        if (GetProcessAffinityMask(GetCurrentProcess(), &affinity_mask, NULL))
+        {
+            if (!(affinity_mask & (affinity_mask - 1)))
+            {
+                WARN("Disabling CSMT, process is running on a single processor.\n");
+                wined3d_settings.cs_multithreaded &= ~WINED3D_CSMT_ENABLE;
+            }
+        }
+    }
+
     if (wined3d_settings.cs_multithreaded & WINED3D_CSMT_ENABLE
             && !RtlIsCriticalSectionLockedByThread(NtCurrentTeb()->Peb->LoaderLock))
     {