wgl: Recognize Vista's PFD_SUPPORT_COMPOSITION flag.

dlls/winex11.drv/opengl.c

@@ -173,6 +173,9 @@ static void dump_PIXELFORMATDESCRIPTOR(const PIXELFORMATDESCRIPTOR *ppfd) {
   TEST_AND_DUMP(ppfd->dwFlags, PFD_SWAP_COPY);
   TEST_AND_DUMP(ppfd->dwFlags, PFD_SWAP_EXCHANGE);
   TEST_AND_DUMP(ppfd->dwFlags, PFD_SWAP_LAYER_BUFFERS);
+  /* PFD_SUPPORT_COMPOSITION is new in Vista, it is similar to composition
+   * under X e.g. COMPOSITE + GLX_EXT_TEXTURE_FROM_PIXMAP. */
+  TEST_AND_DUMP(ppfd->dwFlags, PFD_SUPPORT_COMPOSITION);
 #undef TEST_AND_DUMP
   TRACE("\n");
 

include/wingdi.h

@@ -88,6 +88,7 @@ typedef struct tagPIXELFORMATDESCRIPTOR {
 #define PFD_SWAP_COPY             0x00000400
 #define PFD_SWAP_LAYER_BUFFERS    0x00000800
 #define PFD_GENERIC_ACCELERATED   0x00001000
+#define PFD_SUPPORT_COMPOSITION   0x00008000 /* Vista stuff */
 
 #define PFD_DEPTH_DONTCARE        0x20000000
 #define PFD_DOUBLEBUFFER_DONTCARE 0x40000000