Mesa (master): st/wgl: fix WGL_SWAP_METHOD_ARB query

[Brian Paul]

Module: Mesa
Branch: master
Commit: 4c11008eba9f58621bbbae430f8717176045b0ce
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4c11008eba9f58621bbbae430f8717176045b0ce

Author: Brian Paul <brianp at vmware.com>
Date:   Tue Jun 16 15:32:46 2015 -0600

st/wgl: fix WGL_SWAP_METHOD_ARB query

There are three possible return values (not two): WGL_SWAP_COPY_ARB,
WGL_SWAP_EXCHANGE_EXT and WGL_SWAP_UNDEFINED_ARB.

VMware bug 1431184

Reviewed-by: Jose Fonseca <jfonseca at vmware.com>
Reviewed-by: Charmaine Lee <charmainel at vmware.com>

---

 src/gallium/state_trackers/wgl/stw_ext_pixelformat.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c b/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
index 9f466ba..e38086e 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_pixelformat.c
@@ -88,7 +88,12 @@ stw_query_attrib(
       return TRUE;
 
    case WGL_SWAP_METHOD_ARB:
-      *pvalue = pfi->pfd.dwFlags & PFD_SWAP_COPY ? WGL_SWAP_COPY_ARB : WGL_SWAP_UNDEFINED_ARB;
+      if (pfi->pfd.dwFlags & PFD_SWAP_COPY)
+         *pvalue = WGL_SWAP_COPY_ARB;
+      else if (pfi->pfd.dwFlags & PFD_SWAP_EXCHANGE)
+         *pvalue = WGL_SWAP_EXCHANGE_EXT;
+      else
+         *pvalue = WGL_SWAP_UNDEFINED_ARB;
       return TRUE;
 
    case WGL_SWAP_LAYER_BUFFERS_ARB: