//
// Copyright(C) 2005-2014 Simon Howard
// Copyright(C) 2021-2022 Graham Sanderson
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:
//     OPL interface.
//

#include "config.h"

#include <stdio.h>
#include <stdlib.h>

#include "opl.h"
#include "opl_internal.h"

#include "SDL.h"

extern opl_driver_t *driver;

typedef struct
{
    int finished;

    SDL_mutex *mutex;
    SDL_cond *cond;
} delay_data_t;

static void DelayCallback(void *_delay_data)
{
    delay_data_t *delay_data = _delay_data;

    SDL_LockMutex(delay_data->mutex);
    delay_data->finished = 1;

    SDL_CondSignal(delay_data->cond);

    SDL_UnlockMutex(delay_data->mutex);
}

void OPL_Delay(uint64_t us)
{
    delay_data_t delay_data;

    if (driver == NULL)
    {
        return;
    }

    // Create a callback that will signal this thread after the
    // specified time.

    delay_data.finished = 0;
    delay_data.mutex = SDL_CreateMutex();
    delay_data.cond = SDL_CreateCond();

    OPL_SetCallback(us, DelayCallback, &delay_data);

    // Wait until the callback is invoked.

    SDL_LockMutex(delay_data.mutex);

    while (!delay_data.finished)
    {
        SDL_CondWait(delay_data.cond, delay_data.mutex);
    }

    SDL_UnlockMutex(delay_data.mutex);

    // Clean up.

    SDL_DestroyMutex(delay_data.mutex);
    SDL_DestroyCond(delay_data.cond);
}