src/gallium/drivers/llvmpipe/lp_scene_queue.c

   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
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 122
 123
 124