llvmpipe: move fences from per-bin to per-thread

Rather than inserting an lp_rast_fence command at the end of each
bin, have each rasterizer thread call this function directly once
it has run out of work to do on a particular scene.

This results in fewer calls to the mutex & related functions, but more
importantly makes it easier to recognize empty bins.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_fence.h b/src/gallium/drivers/llvmpipe/lp_fence.h
index d9270f5784a..13358fb99f2 100644
--- a/src/gallium/drivers/llvmpipe/lp_fence.h
+++ b/src/gallium/drivers/llvmpipe/lp_fence.h
@@ -32,6 +32,7 @@
 
 #include "os/os_thread.h"
 #include "pipe/p_state.h"
+#include "util/u_inlines.h"
 
 
 struct pipe_screen;
@@ -61,4 +62,21 @@ void
 llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen);
 
 
+void
+lp_fence_destroy(struct lp_fence *fence);
+
+static INLINE void
+lp_fence_reference(struct lp_fence **ptr,
+                   struct lp_fence *f)
+{
+   struct lp_fence *old = *ptr;
+
+   if (pipe_reference(&old->reference, &f->reference)) {
+      lp_fence_destroy(old);
+   }
+   
+   *ptr = f;
+}
+
+
 #endif /* LP_FENCE_H */