src/add-ons/accelerants/et6x00/EngineManagment.c

   1 /*****************************************************************************\
   2  * Tseng Labs ET6000, ET6100 and ET6300 graphics driver for BeOS 5.
   3  * Copyright (c) 2003-2004, Evgeniy Vladimirovich Bobkov.
   4 \*****************************************************************************/
   5
   6 #include "GlobalData.h"
   7 #include "generic.h"
   8
   9
  10 /*****************************************************************************/
  11 static engine_token et6000EngineToken = {1, B_2D_ACCELERATION, NULL};
  12 /*****************************************************************************/
  13 uint32 ACCELERANT_ENGINE_COUNT(void) {
  14     return 1;
  15 }
  16 /*****************************************************************************/
  17 status_t ACQUIRE_ENGINE(uint32 capabilities,
  18                         uint32 max_wait,
  19                         sync_token *st,
  20                         engine_token **et)
  21 {
  22     /* acquire the shared benaphore */
  23     AQUIRE_BEN(si->engine.lock)
  24     /* sync if required */
  25     if (st) SYNC_TO_TOKEN(st);
  26
  27     /* return an engine token */
  28     *et = &et6000EngineToken;
  29     return B_OK;
  30 }
  31 /*****************************************************************************/
  32 status_t RELEASE_ENGINE(engine_token *et, sync_token *st) {
  33     /* update the sync token, if any */
  34     if (st) {
  35         st->engine_id = et->engine_id;
  36         st->counter = si->engine.count;
  37     }
  38
  39     /* release the shared benaphore */
  40     RELEASE_BEN(si->engine.lock)
  41     return B_OK;
  42 }
  43 /*****************************************************************************/
  44 void WAIT_ENGINE_IDLE(void) {
  45     et6000aclWaitIdle();
  46     /* note our current possition */
  47     si->engine.lastIdle = si->engine.count;
  48 }
  49 /*****************************************************************************/
  50 status_t GET_SYNC_TOKEN(engine_token *et, sync_token *st) {
  51     st->engine_id = et->engine_id;
  52     st->counter = si->engine.count;
  53     return B_OK;
  54 }
  55 /*****************************************************************************/
  56 status_t SYNC_TO_TOKEN(sync_token *st) {
  57     WAIT_ENGINE_IDLE();
  58     si->engine.lastIdle = st->counter;
  59     return B_OK;
  60 }
  61 /*****************************************************************************/