Mesa (master): glx: Compare old ctx against dummyCtx, not NULL

[Kristian Høgsberg]

Module: Mesa
Branch: master
Commit: f485ee724d1f1bb57a5c8931f28e7a45ceb5b5d5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f485ee724d1f1bb57a5c8931f28e7a45ceb5b5d5

Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Thu Jul 29 18:44:26 2010 -0400

glx: Compare old ctx against dummyCtx, not NULL

https://bugs.freedesktop.org/show_bug.cgi?id=29302

---

 src/glx/glxclient.h    |    2 ++
 src/glx/glxcurrent.c   |    2 +-
 src/glx/indirect_glx.c |    2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/glx/glxclient.h b/src/glx/glxclient.h
index 84e1742..81c9a26 100644
--- a/src/glx/glxclient.h
+++ b/src/glx/glxclient.h
@@ -774,6 +774,8 @@ GetGLXDRIDrawable(Display *dpy, GLXDrawable drawable);
 
 #endif
 
+extern struct glx_context dummyContext;
+
 extern struct glx_screen *
 indirect_create_screen(int screen, struct glx_display * priv);
 extern struct glx_context *
diff --git a/src/glx/glxcurrent.c b/src/glx/glxcurrent.c
index 0eccc9f..e256997 100644
--- a/src/glx/glxcurrent.c
+++ b/src/glx/glxcurrent.c
@@ -60,7 +60,7 @@ static GLubyte dummyBuffer[__GLX_BUFFER_LIMIT_SIZE];
 ** gl and glx entry points are designed to operate as nop's when using
 ** the dummy context structure.
 */
-static struct glx_context dummyContext = {
+struct glx_context dummyContext = {
    &dummyBuffer[0],
    &dummyBuffer[0],
    &dummyBuffer[0],
diff --git a/src/glx/indirect_glx.c b/src/glx/indirect_glx.c
index cbc3129..f059840 100644
--- a/src/glx/indirect_glx.c
+++ b/src/glx/indirect_glx.c
@@ -137,7 +137,7 @@ indirect_bind_context(struct glx_context *gc, struct glx_context *old,
    Display *dpy = gc->psc->dpy;
    int opcode = __glXSetupForCommand(dpy);
 
-   if (old && !old->isDirect && old->psc->dpy == dpy)
+   if (old != &dummyContext && !old->isDirect && old->psc->dpy == dpy)
       tag = old->currentContextTag;
    else
       tag = None;