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      1 /**************************************************************************
      2  *
      3  * Copyright 2009 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 
     29 /**
     30  * Scene queue.  We'll use two queues.  One contains "full" scenes which
     31  * are produced by the "setup" code.  The other contains "empty" scenes
     32  * which are produced by the "rast" code when it finishes rendering a scene.
     33  */
     34 
     35 #include "util/u_ringbuffer.h"
     36 #include "util/u_memory.h"
     37 #include "lp_scene_queue.h"
     38 
     39 
     40 
     41 #define MAX_SCENE_QUEUE 4
     42 
     43 struct scene_packet {
     44    struct util_packet header;
     45    struct lp_scene *scene;
     46 };
     47 
     48 /**
     49  * A queue of scenes
     50  */
     51 struct lp_scene_queue
     52 {
     53    struct util_ringbuffer *ring;
     54 };
     55 
     56 
     57 
     58 /** Allocate a new scene queue */
     59 struct lp_scene_queue *
     60 lp_scene_queue_create(void)
     61 {
     62    struct lp_scene_queue *queue = CALLOC_STRUCT(lp_scene_queue);
     63    if (queue == NULL)
     64       return NULL;
     65 
     66    queue->ring = util_ringbuffer_create( MAX_SCENE_QUEUE *
     67                                          sizeof( struct scene_packet ) / 4);
     68    if (queue->ring == NULL)
     69       goto fail;
     70 
     71    return queue;
     72 
     73 fail:
     74    FREE(queue);
     75    return NULL;
     76 }
     77 
     78 
     79 /** Delete a scene queue */
     80 void
     81 lp_scene_queue_destroy(struct lp_scene_queue *queue)
     82 {
     83    util_ringbuffer_destroy(queue->ring);
     84    FREE(queue);
     85 }
     86 
     87 
     88 /** Remove first lp_scene from head of queue */
     89 struct lp_scene *
     90 lp_scene_dequeue(struct lp_scene_queue *queue, boolean wait)
     91 {
     92    struct scene_packet packet;
     93    enum pipe_error ret;
     94 
     95    packet.scene = NULL;
     96 
     97    ret = util_ringbuffer_dequeue(queue->ring,
     98                                  &packet.header,
     99                                  sizeof packet / 4,
    100                                  wait );
    101    if (ret != PIPE_OK)
    102       return NULL;
    103 
    104    return packet.scene;
    105 }
    106 
    107 
    108 /** Add an lp_scene to tail of queue */
    109 void
    110 lp_scene_enqueue(struct lp_scene_queue *queue, struct lp_scene *scene)
    111 {
    112    struct scene_packet packet;
    113 
    114    packet.header.dwords = sizeof packet / 4;
    115    packet.header.data24 = 0;
    116    packet.scene = scene;
    117 
    118    util_ringbuffer_enqueue(queue->ring, &packet.header);
    119 }
    120 
    121 
    122 
    123 
    124 
    125