QT 4.0 (Windows) compatibility patch

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The attached patch enhances compatibility with QT 4.0 on Windows. QT 
implements an abstraction of an OpenGL context in its QGLContext class.
To create a context QGLContext always calls wglCreateLayerContext() even 
though a call to wglCreateContext() would do. To account for this I 
changed the implementation of wglCreateLayirContext_prox() in 
opengl_stub/wgl.c such that it forwards the call to 
wglCreateContext_prox() if layerPlane == 0.

Michael


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Index: opengl_stub/wgl.c
===================================================================
RCS file: /cvsroot/chromium/cr/opengl_stub/wgl.c,v
retrieving revision 1.39
diff -u -r1.39 wgl.c
--- opengl_stub/wgl.c	1 Sep 2006 12:57:59 -0000	1.39
+++ opengl_stub/wgl.c	12 Sep 2006 10:55:31 -0000
@@ -283,9 +284,16 @@
 
 HGLRC WINAPI wglCreateLayerContext_prox( HDC hdc, int layerPlane )
 {
+  /* We return a standard context if layerPlane == 0. This enhances compatibility
+     for applications which always call CreateLayerContext() even though a call to
+     CreateContext() will do (i.e. qt 4.0). */
 	stubInit();
-	crWarning( "wglCreateLayerContext: unsupported" );
-	return 0;
+  if (layerPlane) {
+  	crWarning( "wglCreateLayerContext: unsupported" );
+    return 0;
+  }
+  else 
+    return wglCreateContext_prox(hdc);
 }
 
 PROC WINAPI wglGetProcAddress_prox( LPCSTR name )

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