Mesa (master): intel: flush old context before binding new context

[Brian Paul]

Module: Mesa
Branch: master
Commit: 55058652b886b95bfc24109a9edb04d274c01c1a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=55058652b886b95bfc24109a9edb04d274c01c1a

Author: Brian Paul <brianp at vmware.com>
Date:   Thu Oct 22 18:32:48 2009 -0600

intel: flush old context before binding new context

Per the GLX spec, when changing rendering contexts, the old context
should first be flushed.

---

 src/mesa/drivers/dri/intel/intel_context.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index d24af46..ddb0550 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -944,10 +944,23 @@ intelMakeCurrent(__DRIcontextPrivate * driContextPriv,
                  __DRIdrawablePrivate * driReadPriv)
 {
    __DRIscreenPrivate *psp = driDrawPriv->driScreenPriv;
+   struct intel_context *intel;
+   GET_CURRENT_CONTEXT(curCtx);
+
+   if (driContextPriv)
+      intel = (struct intel_context *) driContextPriv->driverPrivate;
+   else
+      intel = NULL;
+
+   /* According to the glXMakeCurrent() man page: "Pending commands to
+    * the previous context, if any, are flushed before it is released."
+    * But only flush if we're actually changing contexts.
+    */
+   if (intel_context(curCtx) && intel_context(curCtx) != intel) {
+      _mesa_flush(curCtx);
+   }
 
    if (driContextPriv) {
-      struct intel_context *intel =
-         (struct intel_context *) driContextPriv->driverPrivate;
       struct intel_framebuffer *intel_fb =
 	 (struct intel_framebuffer *) driDrawPriv->driverPrivate;
       GLframebuffer *readFb = (GLframebuffer *) driReadPriv->driverPrivate;