/*
 * DirectSound output code for MultiVoc
 * by Jonathon Fowler (jonof@edgenetwk.com)
 */
//-------------------------------------------------------------------------
/*
Duke Nukem Copyright (C) 1996, 2003 3D Realms Entertainment

This file is part of Duke Nukem 3D version 1.5 - Atomic Edition

Duke Nukem 3D 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.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
//-------------------------------------------------------------------------

#include "sdlout.h"
#include "SDL.h"
#include <stdio.h>
#include <string.h>
#include "osd.h"

#include "sdlayer.h"

#if defined(__WATCOMC__) || defined(_MSC_VER)
#include <malloc.h>
#endif


#ifndef RENDERTYPESDL
#error The SDL output module for AudioLib only works with the SDL interface.
#endif

static int (*_SDLSOUND_CallBack)(int) = NULL;
static int _SDLSOUND_BufferLength = 0;
static int _SDLSOUND_NumBuffers   = 0;
static char *_SDLSOUND_MixBuffer  = NULL;

static int SDLSOUND_Installed = FALSE;

int SDLSOUND_ErrorCode = SDLSOUND_Ok;

#define SDLSOUND_SetErrorCode( status ) \
   SDLSOUND_ErrorCode   = ( status );

static void isr(void *userdata, unsigned char *stream, int len);

/*
 * DisableInterrupts
 * Enter the critical section.
 */
int DisableInterrupts(void)
{
	SDL_LockAudio();

	return 0;
}


/*
 * RestoreInterrupts
 * Leave the critical section.
 */
int RestoreInterrupts(int a)
{
	SDL_UnlockAudio();

	return 0;
	a=a;
}


/*
 * SDLSOUND_ErrorString
 * Returns a description of an error code.
 */
char *SDLSOUND_ErrorString(int errorcode)
{
	switch (errorcode) {
		case SDLSOUND_Warning:
		case SDLSOUND_Error:
			return SDLSOUND_ErrorString(SDLSOUND_ErrorCode);

		case SDLSOUND_Ok:
			return "SDL Sound ok.";

		default:
			return "Unknown SDL sound error code.";
	}
}


/*
 * SDLSOUND_Init
 * Initializes the SDL sound objects.
 */
int SDLSOUND_Init(int soundcard, int mixrate, int numchannels, int samplebits, int buffersize)
{
	SDL_AudioSpec spec,got;
	
	if (SDLSOUND_Installed) {
		SDLSOUND_Shutdown();
	}

	printOSD("Initializing SDL sound...\n");

	printOSD("  - Requested sound format\n"
	         "      Channels:    %d\n"
		 "      Sample rate: %dHz\n"
		 "      Sample size: %d bits\n",
		 numchannels, mixrate, samplebits);

	spec.freq = mixrate;
	spec.format = (samplebits == 8 ? AUDIO_U8 : AUDIO_S16LSB);
	spec.channels = (numchannels == 1 ? 1:2);
	spec.samples = (buffersize >> (spec.channels-1)) >> (samplebits==16);
	spec.callback = isr;
	spec.userdata = NULL;


	SDLSOUND_Installed = TRUE;
	
	SDLSOUND_SetErrorCode(SDLSOUND_Ok);
	return SDLSOUND_Ok;
}


/*
 * SDLSOUND_Shutdown
 * Shuts down SDL sound and it's associates.
 */
int SDLSOUND_Shutdown(void)
{
	int i;

	if (SDLSOUND_Installed) printOSD("Uninitializing SDL sound...\n");

	SDLSOUND_Installed = FALSE;

	SDLSOUND_StopPlayback();

	
	SDLSOUND_SetErrorCode(SDLSOUND_Ok);
	return SDLSOUND_Ok;
}


/*
 * SDLSOUND_SetMixMode
 * Bit of filler for the future.
 */
int SDLSOUND_SetMixMode(int mode)
{
	return mode;
}


static void isr(void *userdata, unsigned char *stream, int len)
{
	// otherwise we just service the interrupt
	if (_DSOUND_CallBack) {

		p = _DSOUND_CallBack(rv-WAIT_OBJECT_0-1);

		hr = IDirectSoundBuffer_Lock(lpDSBSecondary, p*_DSOUND_BufferLength, _DSOUND_BufferLength,
					&lockptr, &lockbytes, &lockptr2, &lockbytes2, 0);
			if (hr == DSERR_BUFFERLOST) {
				hr = IDirectSoundBuffer_Restore(lpDSBSecondary);
			}
			if (hr == DS_OK) {
				/*
#define copybuf(S,D,c) \
	({ void *__S=(S), *__D=(D); long __c=(c); \
	   __asm__ __volatile__ ("rep; movsl" \
		: "+S" (__S), "+D" (__D), "+c" (__c) : : "memory", "cc"); \
	 0; })
*/
				//copybuf(_DSOUND_MixBuffer + p * _DSOUND_BufferLength, lockptr, _DSOUND_BufferLength >> 2);
				memcpy(lockptr, _DSOUND_MixBuffer + p * _DSOUND_BufferLength, _DSOUND_BufferLength);
				IDirectSoundBuffer_Unlock(lpDSBSecondary, lockptr, lockbytes, lockptr2, lockbytes2);
			}

		}
	}
}


/*
 * SDLSOUND_BeginBufferedPlayback
 * Unpause SDL sound playback.
 */
int DSOUND_BeginBufferedPlayback(char *BufferStart, int (*CallBackFunc)(int), int buffersize, int numdivisions)
{
	_SDLSOUND_CallBack = CallBackFunc;
	_SDLSOUND_MixBuffer = BufferStart;

	_SDLSOUND_BufferLength = buffersize/numdivisions;
	_SDLSOUND_NumBuffers   = numdivisions;

	return SDLSOUND_Ok;
}


/*
 * DSOUND_StopPlayback
 * Halts the playback thread.
 */
int DSOUND_StopPlayback(void)
{
//	DWORD exitcode;
	BOOL t;
	int i;
	
	if (isrthread) {
		SetEvent(isrfinish);

		printOSD("DirectSound: Waiting for sound thread to exit\n");
		if (WaitForSingleObject(isrthread, 300) == WAIT_OBJECT_0)
			printOSD("DirectSound: Sound thread has exited\n");
		else
			printOSD("DirectSound: Sound thread failed to exit!\n");
		/*
		while (1) {
			if (!GetExitCodeThread(isrthread, &exitcode)) {
				DSOUND_SetErrorCode(DSOUND_FailedGetExitCode);
				return DSOUND_Warning;
			}
			if (exitcode != STILL_ACTIVE) break;
		}*/

		CloseHandle(isrthread);
		isrthread = NULL;
	}

	if (isrfinish) {
		CloseHandle(isrfinish);
		isrfinish = NULL;
	}

	if (lpDSBSecondary) {
		IDirectSoundBuffer_Stop(lpDSBSecondary);
	}
	
	if (hPosNotify) {
		for (i=0; i<_DSOUND_NumBuffers; i++) {
			if (hPosNotify[i]) CloseHandle(hPosNotify[i]);
		}
		free(hPosNotify);
		hPosNotify = NULL;
	}

	return DSOUND_Ok;
}


