MAINT-8197 Compliment benchmark crash processing with SEH handling

indra/newview/llfeaturemanager.cpp

@@ -377,6 +377,43 @@ bool LLFeatureManager::parseFeatureTable(std::string filename)
 
 F32 gpu_benchmark();
 
+#if LL_WINDOWS
+
+static const U32 STATUS_MSC_EXCEPTION = 0xE06D7363; // compiler specific
+
+U32 exception_benchmark_filter(U32 code, struct _EXCEPTION_POINTERS *exception_infop)
+{
+    if (code == STATUS_MSC_EXCEPTION)
+    {
+        // C++ exception, go on
+        return EXCEPTION_CONTINUE_SEARCH;
+    }
+    else
+    {
+        // handle it
+        return EXCEPTION_EXECUTE_HANDLER;
+    }
+}
+
+F32 logExceptionBenchmark()
+{
+    // Todo: make a wrapper/class for SEH exceptions
+    F32 gbps = -1;
+    __try
+    {
+        gbps = gpu_benchmark();
+    }
+    __except (exception_benchmark_filter(GetExceptionCode(), GetExceptionInformation()))
+    {
+        // convert to C++ styled exception
+        char integer_string[32];
+        sprintf(integer_string, "SEH, code: %lu\n", GetExceptionCode());
+        throw std::exception(integer_string);
+    }
+    return gbps;
+}
+#endif
+
 bool LLFeatureManager::loadGPUClass()
 {
 	if (!gSavedSettings.getBOOL("SkipBenchmark"))
@@ -385,7 +422,11 @@ bool LLFeatureManager::loadGPUClass()
 		F32 gbps;
 		try
 		{
+#if LL_WINDOWS
+			gbps = logExceptionBenchmark();
+#else
 			gbps = gpu_benchmark();
+#endif
 		}
 		catch (const std::exception& e)
 		{
@@ -400,11 +441,11 @@ bool LLFeatureManager::loadGPUClass()
 		LL_WARNS("RenderInit") << "Unable to get an accurate benchmark; defaulting to class 3" << LL_ENDL;
 		mGPUClass = GPU_CLASS_3;
 	#else
-			if (gGLManager.mGLVersion < 2.f)
+			if (gGLManager.mGLVersion <= 2.f)
 			{
 				mGPUClass = GPU_CLASS_0;
 			}
-			else if (gGLManager.mGLVersion < 3.f)
+			else if (gGLManager.mGLVersion <= 3.f)
 			{
 				mGPUClass = GPU_CLASS_1;
 			}