gallium/st: Add a method to flush outstanding swapbuffers

Add a state tracker interface method to flush outstanding swapbuffers, and
add a call to it from the mesa state tracker during glFinish().
This doesn't strictly mean the outstanding swapbuffers have actually finished
executing but is sufficient for glFinish()
to be able to be used as a replacement for glXWaitGL().

Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Sinclair Yeh <[email protected]>

3 files changed, 27 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index 8375308c3e2..5a260184ede 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -73,6 +73,8 @@ void st_finish( struct st_context *st )
                                      PIPE_TIMEOUT_INFINITE);
       st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
    }
+
+   st_manager_flush_swapbuffers();
 }
 
 
diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index 28cf0234cd6..617a691a67c 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -1064,6 +1064,28 @@ st_manager_validate_framebuffers(struct st_context *st)
    st_context_validate(st, stdraw, stread);
 }
 
+
+/**
+ * Flush any outstanding swapbuffers on the current draw framebuffer.
+ */
+void
+st_manager_flush_swapbuffers(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct st_context *st = (ctx) ? ctx->st : NULL;
+   struct st_framebuffer *stfb;
+
+   if (!st)
+      return;
+
+   stfb = st_ws_framebuffer(ctx->DrawBuffer);
+   if (!stfb || !stfb->iface->flush_swapbuffers)
+      return;
+
+   stfb->iface->flush_swapbuffers(&st->iface, stfb->iface);
+}
+
+
 /**
  * Add a color renderbuffer on demand.  The FBO must correspond to a window,
  * not a user-created FBO.
diff --git a/src/mesa/state_tracker/st_manager.h b/src/mesa/state_tracker/st_manager.h
index c54f29e2941..1a1ea79af8e 100644
--- a/src/mesa/state_tracker/st_manager.h
+++ b/src/mesa/state_tracker/st_manager.h
@@ -53,4 +53,7 @@ st_framebuffer_reference(struct st_framebuffer **ptr,
 void
 st_framebuffer_interface_destroy(struct st_framebuffer_interface *stfbi);
 
+void
+st_manager_flush_swapbuffers(void);
+
 #endif /* ST_MANAGER_H */