1 files changed, 152 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_fence.c b/src/gallium/drivers/llvmpipe/lp_fence.c
new file mode 100644
index 0000000000..75d8d2b825
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_fence.c
@@ -0,0 +1,152 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "pipe/p_screen.h"
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+#include "lp_debug.h"
+#include "lp_fence.h"
+
+
+/**
+ * Create a new fence object.
+ *
+ * The rank will be the number of bins in the scene.  Whenever a rendering
+ * thread hits a fence command, it'll increment the fence counter.  When
+ * the counter == the rank, the fence is finished.
+ *
+ * \param rank  the expected finished value of the fence counter.
+ */
+struct lp_fence *
+lp_fence_create(unsigned rank)
+{
+   struct lp_fence *fence = CALLOC_STRUCT(lp_fence);
+
+   pipe_reference_init(&fence->reference, 1);
+
+   pipe_mutex_init(fence->mutex);
+   pipe_condvar_init(fence->signalled);
+
+   fence->rank = rank;
+
+   return fence;
+}
+
+
+/** Destroy a fence.  Called when refcount hits zero. */
+static void
+lp_fence_destroy(struct lp_fence *fence)
+{
+   pipe_mutex_destroy(fence->mutex);
+   pipe_condvar_destroy(fence->signalled);
+   FREE(fence);
+}
+
+
+/**
+ * For reference counting.
+ * This is a Gallium API function.
+ */
+static void
+llvmpipe_fence_reference(struct pipe_screen *screen,
+                         struct pipe_fence_handle **ptr,
+                         struct pipe_fence_handle *fence)
+{
+   struct lp_fence *old = (struct lp_fence *) *ptr;
+   struct lp_fence *f = (struct lp_fence *) fence;
+
+   if (pipe_reference(&old->reference, &f->reference)) {
+      lp_fence_destroy(old);
+   }
+}
+
+
+/**
+ * Has the fence been executed/finished?
+ * This is a Gallium API function.
+ */
+static int
+llvmpipe_fence_signalled(struct pipe_screen *screen,
+                         struct pipe_fence_handle *fence,
+                         unsigned flag)
+{
+   struct lp_fence *f = (struct lp_fence *) fence;
+
+   return f->count == f->rank;
+}
+
+
+/**
+ * Wait for the fence to finish.
+ * This is a Gallium API function.
+ */
+static int
+llvmpipe_fence_finish(struct pipe_screen *screen,
+                      struct pipe_fence_handle *fence_handle,
+                      unsigned flag)
+{
+   struct lp_fence *fence = (struct lp_fence *) fence_handle;
+
+   pipe_mutex_lock(fence->mutex);
+   while (fence->count < fence->rank) {
+      pipe_condvar_wait(fence->signalled, fence->mutex);
+   }
+   pipe_mutex_unlock(fence->mutex);
+
+   return 0;
+}
+
+
+/**
+ * Called by the rendering threads to increment the fence counter.
+ * When the counter == the rank, the fence is finished.
+ */
+void
+lp_fence_signal(struct lp_fence *fence)
+{
+   pipe_mutex_lock(fence->mutex);
+
+   fence->count++;
+   assert(fence->count <= fence->rank);
+
+   LP_DBG(DEBUG_RAST, "%s count=%u rank=%u\n", __FUNCTION__,
+          fence->count, fence->rank);
+
+   pipe_condvar_signal(fence->signalled);
+
+   pipe_mutex_unlock(fence->mutex);
+}
+
+
+void
+llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen)
+{
+   screen->fence_reference = llvmpipe_fence_reference;
+   screen->fence_signalled = llvmpipe_fence_signalled;
+   screen->fence_finish = llvmpipe_fence_finish;
+}