gallium: extend pipe_context::flush for it to accept an END_OF_FRAME flag

Usage with pipe_context:
  pipe->flush(pipe, NULL, PIPE_FLUSH_END_OF_FRAME);

Usage with st_context_iface:
  st->flush(st, ST_FLUSH_END_OF_FRAME, NULL);

The flag is only a hint for drivers. Radeon will use it for buffer eviction
heuristics in the kernel (e.g. for queries like how many frames have passed
since a buffer was used).

The flag is currently only generated by st/dri on SwapBuffers.

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Stéphane Marchesin <[email protected]>

4 files changed, 16 insertions, 8 deletions

diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index 7c9f91f1bc7..b569e3b3c6f 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -76,15 +76,16 @@ display_front_buffer(struct st_context *st)
 }
 
 
-void st_flush( struct st_context *st,
-               struct pipe_fence_handle **fence )
+void st_flush(struct st_context *st,
+              struct pipe_fence_handle **fence,
+              enum pipe_flush_flags flags)
 {
    FLUSH_VERTICES(st->ctx, 0);
    FLUSH_CURRENT(st->ctx, 0);
 
    st_flush_bitmap_cache(st);
 
-   st->pipe->flush( st->pipe, fence );
+   st->pipe->flush(st->pipe, fence, flags);
 }
 
 
@@ -95,7 +96,7 @@ void st_finish( struct st_context *st )
 {
    struct pipe_fence_handle *fence = NULL;
 
-   st_flush(st, &fence);
+   st_flush(st, &fence, 0);
 
    if(fence) {
       st->pipe->screen->fence_finish(st->pipe->screen, fence,
@@ -118,7 +119,7 @@ static void st_glFlush(struct gl_context *ctx)
     * synchronization issues.  Calling finish() here will just hide
     * problems that need to be fixed elsewhere.
     */
-   st_flush(st, NULL);
+   st_flush(st, NULL, 0);
 
    if (is_front_buffer_dirty(st)) {
       display_front_buffer(st);
diff --git a/src/mesa/state_tracker/st_cb_flush.h b/src/mesa/state_tracker/st_cb_flush.h
index 598536ba045..003e2a2a940 100644
--- a/src/mesa/state_tracker/st_cb_flush.h
+++ b/src/mesa/state_tracker/st_cb_flush.h
@@ -41,7 +41,8 @@ st_init_flush_functions(struct dd_function_table *functions);
 
 extern void
 st_flush(struct st_context *st,
-         struct pipe_fence_handle **fence);
+         struct pipe_fence_handle **fence,
+         enum pipe_flush_flags flags);
 
 extern void
 st_finish(struct st_context *st);
diff --git a/src/mesa/state_tracker/st_cb_syncobj.c b/src/mesa/state_tracker/st_cb_syncobj.c
index f9f2348a3e1..94bf4861da9 100644
--- a/src/mesa/state_tracker/st_cb_syncobj.c
+++ b/src/mesa/state_tracker/st_cb_syncobj.c
@@ -72,7 +72,7 @@ static void st_fence_sync(struct gl_context *ctx, struct gl_sync_object *obj,
    assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE && flags == 0);
    assert(so->fence == NULL);
 
-   pipe->flush(pipe, &so->fence);
+   pipe->flush(pipe, &so->fence, 0);
 }
 
 static void st_check_sync(struct gl_context *ctx, struct gl_sync_object *obj)
diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index 30f5ca5ed1e..a3a67712a2f 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -455,7 +455,13 @@ st_context_flush(struct st_context_iface *stctxi, unsigned flags,
                  struct pipe_fence_handle **fence)
 {
    struct st_context *st = (struct st_context *) stctxi;
-   st_flush(st, fence);
+   enum pipe_flush_flags pipe_flags = 0;
+
+   if (flags & ST_FLUSH_END_OF_FRAME) {
+      pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
+   }
+
+   st_flush(st, fence, pipe_flags);
    if (flags & ST_FLUSH_FRONT)
       st_manager_flush_frontbuffer(st);
 }