/*
        Copyright 1999, Be Incorporated.   All Rights Reserved.
        This file may be used under the terms of the Be Sample Code License.

        Other authors:
        Gerald Zajac 2007-2008
*/

#include "accelerant.h"


static engine_token engineToken = { 1, B_2D_ACCELERATION, NULL };


uint32
AccelerantEngineCount(void)
{
        return 1;
}


status_t
AcquireEngine(uint32 capabilities, uint32 max_wait,
                                                sync_token* st, engine_token** et)
{
        (void)capabilities;     // avoid compiler warning for unused arg
        (void)max_wait;         // avoid compiler warning for unused arg

        if (gInfo.sharedInfo->engineLock.Acquire() != B_OK)
                return B_ERROR;

        // Sync if required.
        if (st)
                SyncToToken(st);

        // Return an engine token.
        *et = &engineToken;
        return B_OK;
}


status_t
ReleaseEngine(engine_token* et, sync_token* st)
{
        // Update the sync token, if any.
        if (st)
                GetSyncToken(et, st);

        gInfo.sharedInfo->engineLock.Release();
        return B_OK;
}


void
WaitEngineIdle(void)
{
        gInfo.WaitForIdle();    // wait until engine is completely idle
}


status_t
GetSyncToken(engine_token* et, sync_token* st)
{
        st->engine_id = et->engine_id;
        st->counter = 0;
        return B_OK;
}


status_t
SyncToToken(sync_token* st)
{
        (void)st;               // avoid compiler warning for unused arg

        WaitEngineIdle();
        return B_OK;
}