#5611 Select a discrete gpu when possible

1 files changed, 11 insertions, 0 deletions

diff --git a/indra/llwindow/llwindowwin32.h b/indra/llwindow/llwindowwin32.h
index d7fc715258..aab2635a34 100644
--- a/indra/llwindow/llwindowwin32.h
+++ b/indra/llwindow/llwindowwin32.h
@@ -172,6 +172,17 @@ protected:
     void    handleCompositionMessage(U32 indexes);
     bool    handleImeRequests(WPARAM request, LPARAM param, LRESULT *result);
 
+    // Additional function to request and hold a high-performance GPU on Windows 10+
+    //
+    // Laptops can dynamically switch between integrated and discrete GPUs.
+    // The Viewer has gpu-specific optimizations, and this switching can cause problems and crashes.
+    // The login screen requires low performance, which can lead to the OS deciding to switch to the integrated GPU.
+    // To avoid this, we request and hold a high-performance GPU using A D3D11 context until login.
+    // For diagnostics, we also log GPU changes.
+    void    requestHighPerformanceGPU() const;
+    bool    detectGPUChange() const;
+    void    clearHighPerformanceGPURequest() const;
+
 protected:
     //
     // Platform specific methods