--- wine-cvs/include/wingdi.h	Mon Apr 22 10:01:17 2002
+++ wine/include/wingdi.h	Sat Jul 20 13:22:05 2002
@@ -3345,6 +3345,39 @@
 BOOL      WINAPI PolyTextOutW(HDC,PPOLYTEXTW,INT);
 #define   PolyTextOut WINELIB_NAME_AW(PolyTextOut)
 
+/* These defines are used by wglSwapLayerBuffers */
+#define WGL_SWAP_MAIN_PLANE (1 <<  0)
+#define WGL_SWAP_OVERLAY1   (1 <<  1)
+#define WGL_SWAP_OVERLAY2   (1 <<  2)
+#define WGL_SWAP_OVERLAY3   (1 <<  3)
+#define WGL_SWAP_OVERLAY4   (1 <<  4)
+#define WGL_SWAP_OVERLAY5   (1 <<  5)
+#define WGL_SWAP_OVERLAY6   (1 <<  6)
+#define WGL_SWAP_OVERLAY7   (1 <<  7)
+#define WGL_SWAP_OVERLAY8   (1 <<  8)
+#define WGL_SWAP_OVERLAY9   (1 <<  9)
+#define WGL_SWAP_OVERLAY10  (1 << 10)
+#define WGL_SWAP_OVERLAY11  (1 << 11)
+#define WGL_SWAP_OVERLAY12  (1 << 12)
+#define WGL_SWAP_OVERLAY13  (1 << 13)
+#define WGL_SWAP_OVERLAY14  (1 << 14)
+#define WGL_SWAP_OVERLAY15  (1 << 15)
+#define WGL_SWAP_UNDERLAY1  (1 << 16)
+#define WGL_SWAP_UNDERLAY2  (1 << 17)
+#define WGL_SWAP_UNDERLAY3  (1 << 18)
+#define WGL_SWAP_UNDERLAY4  (1 << 19)
+#define WGL_SWAP_UNDERLAY5  (1 << 20)
+#define WGL_SWAP_UNDERLAY6  (1 << 21)
+#define WGL_SWAP_UNDERLAY7  (1 << 22)
+#define WGL_SWAP_UNDERLAY8  (1 << 23)
+#define WGL_SWAP_UNDERLAY9  (1 << 24)
+#define WGL_SWAP_UNDERLAY10 (1 << 25)
+#define WGL_SWAP_UNDERLAY11 (1 << 26)
+#define WGL_SWAP_UNDERLAY12 (1 << 27)
+#define WGL_SWAP_UNDERLAY13 (1 << 28)
+#define WGL_SWAP_UNDERLAY14 (1 << 29)
+#define WGL_SWAP_UNDERLAY15 (1 << 30)
+
 #ifdef __cplusplus
 }
 #endif
--- wine-cvs/dlls/opengl32/wgl.c	Tue May 14 10:04:06 2002
+++ wine/dlls/opengl32/wgl.c	Sat Jul 20 13:22:49 2002
@@ -424,9 +424,18 @@
  */
 BOOL WINAPI wglSwapLayerBuffers(HDC hdc,
 				UINT fuPlanes) {
-  FIXME("(): stub !\n");
+  TRACE("(%08x, %08x)\n", hdc, fuPlanes);
 
-  return FALSE;
+  if (fuPlanes & WGL_SWAP_MAIN_PLANE) {
+    if (!SwapBuffers(hdc)) return FALSE;
+    fuPlanes &= ~WGL_SWAP_MAIN_PLANE;
+  }
+
+  if (fuPlanes) {
+    WARN("Following layers unhandled : %08x\n", fuPlanes);
+  }
+  
+  return TRUE;
 }
 
 /***********************************************************************