From c6626fbc0b46ddafb492c166d1bdf73ff95fe73b Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olv@lunarg.com>
Date: Wed, 8 Sep 2010 00:30:27 +0800
Subject: [PATCH] st/xlib: Notify the context when the front/back buffers are swapped.

The current context should be notified when the the front/back buffers
of the current drawable are swapped.  The notification was skipped when
xmesa_strict_invalidate is false (the default).
---
 src/gallium/state_trackers/glx/xlib/xm_api.c |   18 ++++++++++++++----
 src/gallium/state_trackers/glx/xlib/xm_api.h |    3 +++
 src/gallium/state_trackers/glx/xlib/xm_st.c  |    4 ++++
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index eb4ce74..a9ba194 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -1082,19 +1082,29 @@ XMesaDestroyBuffer(XMesaBuffer b)
 
 
 /**
- * Query the current drawable size and notify the binding context.
+ * Notify the binding context to validate the buffer.
  */
 void
-xmesa_check_buffer_size(XMesaBuffer b)
+xmesa_notify_invalid_buffer(XMesaBuffer b)
 {
    XMesaContext xmctx = XMesaGetCurrentContext();
 
+   if (xmctx && xmctx->xm_buffer == b)
+      xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
+}
+
+
+/**
+ * Query the current drawable size and notify the binding context.
+ */
+void
+xmesa_check_buffer_size(XMesaBuffer b)
+{
    if (b->type == PBUFFER)
       return;
 
    xmesa_get_window_size(b->xm_visual->display, b, &b->width, &b->height);
-   if (xmctx && xmctx->xm_buffer == b)
-      xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
+   xmesa_notify_invalid_buffer(b);
 }
 
 
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.h b/src/gallium/state_trackers/glx/xlib/xm_api.h
index f209b14..fedf2b2 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.h
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.h
@@ -361,6 +361,9 @@ xmesa_get_window_size(Display *dpy, XMesaBuffer b,
                       GLuint *width, GLuint *height);
 
 extern void
+xmesa_notify_invalid_buffer(XMesaBuffer b);
+
+extern void
 xmesa_check_buffer_size(XMesaBuffer b);
 
 extern void
diff --git a/src/gallium/state_trackers/glx/xlib/xm_st.c b/src/gallium/state_trackers/glx/xlib/xm_st.c
index 4c0ce07..4d0f5e6 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_st.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_st.c
@@ -339,6 +339,10 @@ xmesa_swap_st_framebuffer(struct st_framebuffer_iface *stfbi)
          tmp = *front;
          *front = *back;
          *back = tmp;
+
+         /* the current context should validate the buffer after swapping */
+         if (!xmesa_strict_invalidate)
+            xmesa_notify_invalid_buffer(xstfb->buffer);
       }
 
       if (xmesa_strict_invalidate)
-- 
1.7.1