wgl: Put the core functionality of X11DRV_SetPixelFormat in a separate function.

dlls/winex11.drv/opengl.c

@@ -1441,25 +1441,16 @@ int X11DRV_GetPixelFormat(X11DRV_PDEVICE *physDev) {
   return physDev->current_pf;
 }
 
-/**
- * X11DRV_SetPixelFormat
- *
- * Set the pixel-format id used by this DC
- */
-BOOL X11DRV_SetPixelFormat(X11DRV_PDEVICE *physDev,
+/* This function is the core of X11DRV_SetPixelFormat and X11DRV_SetPixelFormatWINE.
+ * Both functions are the same except that X11DRV_SetPixelFormatWINE allows you to
+ * set the pixel format multiple times. */
+static BOOL internal_SetPixelFormat(X11DRV_PDEVICE *physDev,
 			   int iPixelFormat,
 			   const PIXELFORMATDESCRIPTOR *ppfd) {
     WineGLPixelFormat *fmt;
     int value;
     HWND hwnd;
 
-  TRACE("(%p,%d,%p)\n", physDev, iPixelFormat, ppfd);
-
-  if (!has_opengl()) {
-    ERR("No libGL on this box - disabling OpenGL support !\n");
-    return FALSE;
-  }
-
     /* SetPixelFormat is not allowed on the X root_window e.g. GetDC(0) */
     if(get_glxdrawable(physDev) == root_window)
     {
@@ -1474,9 +1465,6 @@ BOOL X11DRV_SetPixelFormat(X11DRV_PDEVICE *physDev,
         return FALSE;
     }
 
-    if(physDev->current_pf)  /* cannot change it if already set */
-        return (physDev->current_pf == iPixelFormat);
-
     pglXGetFBConfigAttrib(gdi_display, fmt->fbconfig, GLX_DRAWABLE_TYPE, &value);
 
     hwnd = WindowFromDC(physDev->hdc);
@@ -1527,6 +1515,28 @@ BOOL X11DRV_SetPixelFormat(X11DRV_PDEVICE *physDev,
     return TRUE;
 }
 
+
+/**
+ * X11DRV_SetPixelFormat
+ *
+ * Set the pixel-format id used by this DC
+ */
+BOOL X11DRV_SetPixelFormat(X11DRV_PDEVICE *physDev,
+			   int iPixelFormat,
+			   const PIXELFORMATDESCRIPTOR *ppfd) {
+    TRACE("(%p,%d,%p)\n", physDev, iPixelFormat, ppfd);
+
+    if (!has_opengl()) {
+        ERR("No libGL on this box - disabling OpenGL support !\n");
+        return FALSE;
+    }
+
+    if(physDev->current_pf)  /* cannot change it if already set */
+        return (physDev->current_pf == iPixelFormat);
+
+    return internal_SetPixelFormat(physDev, iPixelFormat, ppfd);
+}
+
 /**
  * X11DRV_wglCopyContext
  *