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// license:BSD-3-Clause
// copyright-holders:David Haywood
/***************************************************************************

    Gomoku sound driver (quick hack of the Wiping sound driver)

    used by wiping.c

***************************************************************************/

#include "emu.h"
#include "includes/gomoku.h"

static const int samplerate = 48000;
static const int defgain = 48;


// device type definition
const device_type GOMOKU = &device_creator<gomoku_sound_device>;


//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  gomoku_sound_device - constructor
//-------------------------------------------------

gomoku_sound_device::gomoku_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
	: device_t(mconfig, GOMOKU, "Gomoku Narabe Renju Audio Custom", tag, owner, clock, "gomoku_sound", __FILE__),
		device_sound_interface(mconfig, *this),
		m_last_channel(NULL),
		m_sound_rom(NULL),
		m_num_voices(0),
		m_sound_enable(0),
		m_stream(NULL),
		m_mixer_table(NULL),
		m_mixer_lookup(NULL),
		m_mixer_buffer(NULL),
		m_mixer_buffer_2(NULL)
{
	memset(m_channel_list, 0, sizeof(gomoku_sound_channel)*GOMOKU_MAX_VOICES);
	memset(m_soundregs1, 0, sizeof(UINT8)*0x20);
	memset(m_soundregs2, 0, sizeof(UINT8)*0x20);
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void gomoku_sound_device::device_start()
{
	gomoku_sound_channel *voice;
	int ch;

	/* get stream channels */
	m_stream = stream_alloc(0, 1, samplerate);

	/* allocate a pair of buffers to mix into - 1 second's worth should be more than enough */
	m_mixer_buffer = auto_alloc_array(machine(), short, 2 * samplerate);
	m_mixer_buffer_2 = m_mixer_buffer + samplerate;

	/* build the mixer table */
	make_mixer_table(8, defgain);

	/* extract globals from the interface */
	m_num_voices = GOMOKU_MAX_VOICES;
	m_last_channel = m_channel_list + m_num_voices;

	m_sound_rom = memregion(":gomoku")->base();

	/* start with sound enabled, many games don't have a sound enable register */
	m_sound_enable = 1;

	/* reset all the voices */
	for (ch = 0, voice = m_channel_list; voice < m_last_channel; ch++, voice++)
	{
		voice->channel = ch;
		voice->frequency = 0;
		voice->counter = 0;
		voice->volume = 0;
		voice->oneshotplaying = 0;
	}
}


//-------------------------------------------------
//  sound_stream_update - handle a stream update in mono
//-------------------------------------------------

void gomoku_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
	stream_sample_t *buffer = outputs[0];
	gomoku_sound_channel *voice;
	short *mix;
	int i, ch;

	/* if no sound, we're done */
	if (m_sound_enable == 0)
	{
		memset(buffer, 0, samples * sizeof(*buffer));
		return;
	}

	/* zap the contents of the mixer buffer */
	memset(m_mixer_buffer, 0, samples * sizeof(short));

	/* loop over each voice and add its contribution */
	for (ch = 0, voice = m_channel_list; voice < m_last_channel; ch++, voice++)
	{
		int f = 16 * voice->frequency;
		int v = voice->volume;

		/* only update if we have non-zero volume and frequency */
		if (v && f)
		{
			int w_base;
			int c = voice->counter;

			if (ch < 3)
				w_base = 0x20 * (m_soundregs1[0x06 + (ch * 8)] & 0x0f);
			else
				w_base = 0x100 * (m_soundregs2[0x1d] & 0x0f);

			mix = m_mixer_buffer;

			/* add our contribution */
			for (i = 0; i < samples; i++)
			{
				c += f;

				if (ch < 3)
				{
					int offs = w_base | ((c >> 16) & 0x1f);

					/* use full byte, first the high 4 bits, then the low 4 bits */
					if (c & 0x8000)
						*mix++ += ((m_sound_rom[offs] & 0x0f) - 8) * v;
					else
						*mix++ += (((m_sound_rom[offs]>>4) & 0x0f) - 8) * v;
				}
				else
				{
					int offs = (w_base + (c >> 16)) & 0x0fff;

					if (m_sound_rom[offs] == 0xff)
					{
						voice->oneshotplaying = 0;
					}

					if (voice->oneshotplaying)
					{
						/* use full byte, first the high 4 bits, then the low 4 bits */
						if (c & 0x8000)
							*mix++ += ((m_sound_rom[offs] & 0x0f) - 8) * v;
						else
							*mix++ += (((m_sound_rom[offs]>>4) & 0x0f) - 8) * v;
					}
				}

				/* update the counter for this voice */
				voice->counter = c;
			}
		}
	}

	/* mix it down */
	mix = m_mixer_buffer;
	for (i = 0; i < samples; i++)
		*buffer++ = m_mixer_lookup[*mix++];
}


/* build a table to divide by the number of voices; gain is specified as gain*16 */
void gomoku_sound_device::make_mixer_table(int voices, int gain)
{
	int count = voices * 128;
	int i;

	/* allocate memory */
	m_mixer_table = auto_alloc_array(machine(), INT16, 256 * voices);

	/* find the middle of the table */
	m_mixer_lookup = m_mixer_table + (128 * voices);

	/* fill in the table - 16 bit case */
	for (i = 0; i < count; i++)
	{
		int val = i * gain * 16 / voices;
		if (val > 32767) val = 32767;
		m_mixer_lookup[ i] = val;
		m_mixer_lookup[-i] = -val;
	}
}


/********************************************************************************/

WRITE8_MEMBER( gomoku_sound_device::sound1_w )
{
	gomoku_sound_channel *voice;
	int base;
	int ch;

	/* update the streams */
	m_stream->update();

	/* set the register */
	m_soundregs1[offset] = data;

	/* recompute all the voice parameters */
	for (ch = 0, base = 0, voice = m_channel_list; voice < m_channel_list + 3; ch++, voice++, base += 8)
	{
		voice->channel = ch;
		voice->frequency = m_soundregs1[0x02 + base] & 0x0f;
		voice->frequency = voice->frequency * 16 + ((m_soundregs1[0x01 + base]) & 0x0f);
		voice->frequency = voice->frequency * 16 + ((m_soundregs1[0x00 + base]) & 0x0f);
	}
}

WRITE8_MEMBER( gomoku_sound_device::sound2_w )
{
	gomoku_sound_channel *voice;
	int base;
	int ch;

	/* update the streams */
	m_stream->update();

	/* set the register */
	m_soundregs2[offset] = data;

	/* recompute all the voice parameters */
	for (ch = 0, base = 0, voice = m_channel_list; voice < m_channel_list + 3; ch++, voice++, base += 8)
	{
		voice->channel = ch;
		voice->volume = m_soundregs2[0x06 + base] & 0x0f;
		voice->oneshotplaying = 0;
	}

	if (offset == 0x1d)
	{
		voice = &m_channel_list[3];
		voice->channel = 3;

		// oneshot frequency is hand tune...
		if ((m_soundregs2[0x1d] & 0x0f) < 0x0c)
			voice->frequency = 3000 / 16;           // ichi, ni, san, yon, go
		else
			voice->frequency = 8000 / 16;           // shoot

		voice->volume = 8;
		voice->counter = 0;

		if (m_soundregs2[0x1d] & 0x0f)
			voice->oneshotplaying = 1;
		else
			voice->oneshotplaying = 0;
	}
}