Age the last_swap_fence properly.

Should be safe unless the client idles without rendering for some
time, while another client renders.

src/mesa/drivers/dri/i915/intel_batchbuffer.c

@@ -175,6 +175,17 @@ static void do_flush_locked( struct intel_batchbuffer *batch,
 		     allow_unlock);
 #endif
    batch->last_fence = bmFenceBufferList(batch->bm, batch->list);
+   if (!batch->intel->last_swap_fence_retired) {
+      int retired;
+      drmFence dFence = {0,batch->intel->last_swap_fence};
+ 
+     /*FIXME: Temporary fix for fence ageing
+      *
+      */
+      if (!drmTestFence(batch->intel->driFd, dFence, 0, &retired)) {
+	 batch->intel->last_swap_fence_retired = retired; 
+      }
+   }	  
 }
 
 

src/mesa/drivers/dri/i915/intel_blit.c

@@ -67,7 +67,13 @@ void intelCopyBuffer( const __DRIdrawablePrivate *dPriv )
    }
    intel = (struct intel_context *) ctx;
 
-   bmFinishFence(intel->bm, intel->last_swap_fence);
+   /* FIXME: Temporary fix for fence ageing.
+    * 
+    */
+
+   if (!intel->last_swap_fence_retired) {
+      bmFinishFence(intel->bm, intel->last_swap_fence);
+   }
 
    /* The LOCK_HARDWARE is required for the cliprects.  Buffer offsets
     * should work regardless.
@@ -138,6 +144,7 @@ void intelCopyBuffer( const __DRIdrawablePrivate *dPriv )
       }
 
       intel->last_swap_fence = intel_batchbuffer_flush( intel->batch );
+      intel->last_swap_fence_retired = GL_FALSE;
    }
    UNLOCK_HARDWARE( intel );
 }

src/mesa/drivers/dri/i915/intel_context.c

@@ -422,6 +422,7 @@ GLboolean intelInitContext( struct intel_context *intel,
 				 intelScreen->height);
    
    intel->batch = intel_batchbuffer_alloc( intel );
+   intel->last_swap_fence_retired = GL_TRUE;
    intel->last_swap_fence = bmInitFence(intel->bm);
    intel_bufferobj_init( intel );
    intel_fbo_init( intel );

src/mesa/drivers/dri/i915/intel_context.h

@@ -172,6 +172,7 @@ struct intel_context
    
    GLuint last_fence;
    GLuint last_swap_fence;
+   GLboolean last_swap_fence_retired;
 
    struct intel_batchbuffer *batch;