Massimo Del Fedele : opengl32: glGetString() should return NULL on NULL context.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: f5cbd282eb431353197ab2785cf2f58a607ae261
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=f5cbd282eb431353197ab2785cf2f58a607ae261

Author: Massimo Del Fedele <max at veneto.com>
Date:   Wed Jul  2 16:51:26 2008 +0200

opengl32: glGetString() should return NULL on NULL context.
(cherry picked from commit d6a6b88f1904783157245cae0b3f5a8d3de1ec20)

---

 dlls/opengl32/wgl.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/dlls/opengl32/wgl.c b/dlls/opengl32/wgl.c
index 6fbdeb4..a07fcf3 100644
--- a/dlls/opengl32/wgl.c
+++ b/dlls/opengl32/wgl.c
@@ -632,6 +632,11 @@ const GLubyte * WINAPI wine_glGetString( GLenum name )
   const GLubyte *ret;
   const char* GL_Extensions = NULL;
 
+  /* this is for buggy nvidia driver, crashing if called from a different
+     thread with no context */
+  if(wglGetCurrentContext() == NULL)
+    return NULL;
+
   if (GL_EXTENSIONS != name) {
     ENTER_GL();
     ret = glGetString(name);