Simple SSE3 skinning algorithm

Future direction: do lots of work such that hsMatrix44 and hsScalarTriple
are 16-byte aligned so that we can use faster aligned loads

Sources/Plasma/Apps/plClient/winmain.cpp

@@ -49,6 +49,10 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
     #include <dmdfm.h>      // Windows Load EXE into memory suff
 #endif
 
+#ifdef HAVE_SSE
+#   include <intrin.h>
+#endif
+
 #include <curl/curl.h>
 
 #include "HeadSpin.h"
@@ -1441,11 +1445,35 @@ LONG WINAPI plCustomUnhandledExceptionFilter( struct _EXCEPTION_POINTERS *Except
     return EXCEPTION_EXECUTE_HANDLER;
 }
 
+bool CheckCPU()
+{
+    const unsigned int sse3_flag = 0x00000001;
+    // (any other CPU features...)
+
+    int cpu_info[4];
+    __cpuid(cpu_info, 1);
+#ifdef HAVE_SSE
+    if(cpu_info[2] & sse3_flag == 0)
+        return false;
+#endif
+    // Insert additional feature checks here
+
+    return true;
+}
+
 #include "pfConsoleCore/pfConsoleEngine.h"
 PF_CONSOLE_LINK_ALL()
 
 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nCmdShow)
 {
+    // Check to make sure we have a good CPU before getting started
+    if (!CheckCPU())
+    {
+        plString msg = plString::Format("Your processor does not support all of the features required to play %S", ProductLongName());
+        hsMessageBox(msg.c_str(), "Error", hsMessageBoxNormal, hsMessageBoxIconError);
+        return PARABLE_NORMAL_EXIT;
+    }
+
     PF_CONSOLE_INIT_ALL()
 
     // Set global handle