From: José Fonseca <jfonseca@vmware.com>
Date: Fri, 23 Dec 2011 02:57:29 +0000 (+0000)
Subject: st/wgl: Return NULL for NULL HDCs in wglGetExtensionsStringARB.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6811704830b6637d7c9b19914bd3549143eeb3e5;p=mesa.git

st/wgl: Return NULL for NULL HDCs in wglGetExtensionsStringARB.

WGL_ARB_extensions_string states that wglGetExtensionsStringARB should
return NULL for invalid HDCs.  And some applications rely on it.

Reviewed-By: "Keith Whitwell" <keithw@vmware.com>
---

diff --git a/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c b/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
index ecb326f1cf6..7cad49c9f84 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
@@ -47,7 +47,9 @@ WINGDIAPI const char * APIENTRY
 wglGetExtensionsStringARB(
    HDC hdc )
 {
-   (void) hdc;
+   if (!hdc) {
+      return NULL;
+   }
 
    return stw_extension_string;
 }