From acbc321c2acbc4282da6c3dc9cc61a9377f74d07 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Wed, 23 Apr 2014 13:47:42 -0700
Subject: [PATCH] Don't try to load d3dcompiler_46.dll on Windows XP

---
 src/core/windows/SDL_windows.c | 25 +++++++++++++++++++++++++
 src/core/windows/SDL_windows.h |  3 +++
 src/video/SDL_egl.c            |  7 +++++--
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/src/core/windows/SDL_windows.c b/src/core/windows/SDL_windows.c
index 16934d5e10430..7f162185fda94 100644
--- a/src/core/windows/SDL_windows.c
+++ b/src/core/windows/SDL_windows.c
@@ -88,6 +88,31 @@ WIN_CoUninitialize(void)
 #endif
 }
 
+static BOOL
+IsWindowsVersionOrGreater(WORD wMajorVersion, WORD wMinorVersion, WORD wServicePackMajor)
+{
+    OSVERSIONINFOEXW osvi;
+    DWORDLONG const dwlConditionMask = VerSetConditionMask(
+        VerSetConditionMask(
+        VerSetConditionMask(
+        0, VER_MAJORVERSION, VER_GREATER_EQUAL ),
+        VER_MINORVERSION, VER_GREATER_EQUAL ),
+        VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL );
+
+    SDL_zero(osvi);
+    osvi.dwOSVersionInfoSize = sizeof(osvi);
+    osvi.dwMajorVersion = wMajorVersion;
+    osvi.dwMinorVersion = wMinorVersion;
+    osvi.wServicePackMajor = wServicePackMajor;
+
+    return VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR, dwlConditionMask) != FALSE;
+}
+
+BOOL WIN_IsWindowsVistaOrGreater()
+{
+    return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_VISTA), LOBYTE(_WIN32_WINNT_VISTA), 0);
+}
+
 #endif /* __WIN32__ */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/core/windows/SDL_windows.h b/src/core/windows/SDL_windows.h
index 45c9d73479dd9..bb563ccd03019 100644
--- a/src/core/windows/SDL_windows.h
+++ b/src/core/windows/SDL_windows.h
@@ -56,6 +56,9 @@ extern int WIN_SetError(const char *prefix);
 extern HRESULT WIN_CoInitialize(void);
 extern void WIN_CoUninitialize(void);
 
+/* Returns SDL_TRUE if we're running on Windows Vista and newer */
+extern BOOL WIN_IsWindowsVistaOrGreater();
+
 #endif /* _INCLUDED_WINDOWS_H */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/SDL_egl.c b/src/video/SDL_egl.c
index e0efa64ef5e4c..cb0cfe2a4d040 100644
--- a/src/video/SDL_egl.c
+++ b/src/video/SDL_egl.c
@@ -135,8 +135,11 @@ SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_displa
 #if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
     d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);
     if (!d3dcompiler) {
-        /* By default we load the Vista+ compatible compiler */
-        d3dcompiler = "d3dcompiler_46.dll";
+        if (WIN_IsWindowsVistaOrGreater()) {
+            d3dcompiler = "d3dcompiler_46.dll";
+        } else {
+            d3dcompiler = "none";
+        }
     }
     if (SDL_strcasecmp(d3dcompiler, "none") != 0) {
         SDL_LoadObject(d3dcompiler);