src/add-ons/accelerants/s3/engine.cpp

   1 /*
   2         Copyright 1999, Be Incorporated.   All Rights Reserved.
   3         This file may be used under the terms of the Be Sample Code License.
   4
   5         Other authors:
   6         Gerald Zajac 2007-2008
   7 */
   8
   9 #include "accel.h"
  10
  11
  12 static engine_token engineToken = { 1, B_2D_ACCELERATION, NULL };
  13
  14
  15 uint32
  16 AccelerantEngineCount(void)
  17 {
  18         return 1;
  19 }
  20
  21
  22 status_t
  23 AcquireEngine(uint32 capabilities, uint32 max_wait,
  24                                                 sync_token* st, engine_token** et)
  25 {
  26         (void)capabilities;     // avoid compiler warning for unused arg
  27         (void)max_wait;         // avoid compiler warning for unused arg
  28
  29         if (gInfo.sharedInfo->engineLock.Acquire() != B_OK)
  30                 return B_ERROR;
  31
  32         // Sync if required.
  33         if (st)
  34                 SyncToToken(st);
  35
  36         // Return an engine token.
  37         *et = &engineToken;
  38         return B_OK;
  39 }
  40
  41
  42 status_t
  43 ReleaseEngine(engine_token* et, sync_token* st)
  44 {
  45         // Update the sync token, if any.
  46         if (st)
  47                 GetSyncToken(et, st);
  48
  49         gInfo.sharedInfo->engineLock.Release();
  50         return B_OK;
  51 }
  52
  53
  54 void
  55 WaitEngineIdle(void)
  56 {
  57         gInfo.WaitIdleEmpty();  // wait until engine is completely idle
  58 }
  59
  60
  61 status_t
  62 GetSyncToken(engine_token* et, sync_token* st)
  63 {
  64         st->engine_id = et->engine_id;
  65         st->counter = 0;
  66         return B_OK;
  67 }
  68
  69
  70 status_t
  71 SyncToToken(sync_token* st)
  72 {
  73         (void)st;               // avoid compiler warning for unused arg
  74
  75         WaitEngineIdle();
  76         return B_OK;
  77 }
  78