1 files changed, 122 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_scene_queue.c b/src/gallium/drivers/llvmpipe/lp_scene_queue.c
new file mode 100644
index 00000000000..43d74e4d89d
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_scene_queue.c
@@ -0,0 +1,122 @@
+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+
+/**
+ * Scene queue.  We'll use two queues.  One contains "full" scenes which
+ * are produced by the "setup" code.  The other contains "empty" scenes
+ * which are produced by the "rast" code when it finishes rendering a scene.
+ */
+
+#include "util/u_ringbuffer.h"
+#include "util/u_memory.h"
+#include "lp_scene_queue.h"
+
+
+
+#define MAX_SCENE_QUEUE 4
+
+struct scene_packet {
+   struct util_packet header;
+   struct lp_scene *scene;
+};
+
+/**
+ * A queue of scenes
+ */
+struct lp_scene_queue
+{
+   struct util_ringbuffer *ring;
+};
+
+
+
+/** Allocate a new scene queue */
+struct lp_scene_queue *
+lp_scene_queue_create(void)
+{
+   struct lp_scene_queue *queue = CALLOC_STRUCT(lp_scene_queue);
+   if (queue == NULL)
+      return NULL;
+
+   queue->ring = util_ringbuffer_create( MAX_SCENE_QUEUE * 
+                                         sizeof( struct scene_packet ) / 4);
+   if (queue->ring == NULL)
+      goto fail;
+
+   return queue;
+
+fail:
+   FREE(queue);
+   return NULL;
+}
+
+
+/** Delete a scene queue */
+void
+lp_scene_queue_destroy(struct lp_scene_queue *queue)
+{
+   util_ringbuffer_destroy(queue->ring);
+   FREE(queue);
+}
+
+
+/** Remove first lp_scene from head of queue */
+struct lp_scene *
+lp_scene_dequeue(struct lp_scene_queue *queue, boolean wait)
+{
+   struct scene_packet packet;
+   enum pipe_error ret;
+
+   ret = util_ringbuffer_dequeue(queue->ring,
+                                 &packet.header,
+                                 sizeof packet / 4,
+                                 wait );
+   if (ret != PIPE_OK)
+      return NULL;
+
+   return packet.scene;
+}
+
+
+/** Add an lp_scene to tail of queue */
+void
+lp_scene_enqueue(struct lp_scene_queue *queue, struct lp_scene *scene)
+{
+   struct scene_packet packet;
+
+   packet.header.dwords = sizeof packet / 4;
+   packet.header.data24 = 0;
+   packet.scene = scene;
+
+   util_ringbuffer_enqueue(queue->ring, &packet.header);
+}
+
+
+
+
+