public override int start(Mame.MachineSound msound)
{
string snd_name = "K005289";
//k005289_sound_channel voice=channel_list;
k005289_interface intf = (k005289_interface)msound.sound_interface;
/* get stream channels */
stream = Mame.stream_init(snd_name, intf.volume, Mame.Machine.sample_rate, 0, K005289_update);
mclock = intf.master_clock;
rate = Mame.Machine.sample_rate;
/* allocate a pair of buffers to mix into - 1 second's worth should be more than enough */
mixer_buffer = new _ShortPtr(2 * sizeof(short) * Mame.Machine.sample_rate);
/* build the mixer table */
if (make_mixer_table(2) != 0)
{
mixer_buffer = null;
return 1;
}
sound_prom = Mame.memory_region(intf.region);
/* reset all the voices */
channel_list[0].frequency = 0;
channel_list[0].volume = 0;
channel_list[0].wave = new _BytePtr(sound_prom);
channel_list[0].counter = 0;
channel_list[1].frequency = 0;
channel_list[1].volume = 0;
channel_list[1].wave = new _BytePtr(sound_prom, 0x100);
channel_list[1].counter = 0;
return 0;
}
public static int stream_init_multi(int channels, string[] names, int[] default_mixing_levels, int sample_rate, int param, _stream_callback_multi callback)
{
int channel = mixer_allocate_channels(channels, default_mixing_levels);
stream_joined_channels[channel] = channels;
for (int i = 0; i < channels; i++)
{
mixer_set_name(channel + i, names[i]);
stream_buffer[channel + i] = new _ShortPtr(sizeof(short) * BUFFER_LEN);
stream_sample_rate[channel + i] = sample_rate;
stream_buffer_pos[channel + i] = 0;
if (sample_rate!=0)
stream_sample_length[channel + i] = 1000000 / sample_rate;
else
stream_sample_length[channel + i] = 0;
}
stream_param[channel] = param;
stream_callback_multi[channel] = callback;
set_RC_filter(channel, 0, 0, 0, 0);
return channel;
}
public static void overlay_draw(osd_bitmap dest, artwork overlay)
{
int i, j;
int height, width;
osd_bitmap o = null;
int black;
o = overlay._artwork;
height = overlay._artwork.height;
width = overlay._artwork.width;
black = Machine.pens[0];
if (dest.depth == 8)
{
_BytePtr dst, ovr;
for (j = 0; j < height; j++)
{
dst = new _BytePtr(dest.line[j]);
ovr = new _BytePtr(o.line[j]);
for (i = 0; i < width; i++)
{
if (dst[0] != black)
dst[0] = ovr[0];
dst.offset++;
ovr.offset++;
}
}
}
else
{
_ShortPtr dst, ovr;
for (j = 0; j < height; j++)
{
dst = new _ShortPtr(dest.line[j]);
ovr = new _ShortPtr(o.line[j]);
for (i = 0; i < width; i++)
{
if (dst.read16(0) != black)
dst.write16(0, ovr.read16(0));
dst.offset += 2;
ovr.offset += 2;
}
}
}
}
public static int stream_init(string name, int default_mixing_level, int sample_rate, int param, _stream_callback callback)
{
int channel = mixer_allocate_channel(default_mixing_level);
stream_joined_channels[channel] = 1;
mixer_set_name(channel, name);
stream_buffer[channel] = new _ShortPtr(sizeof(short) * BUFFER_LEN);
stream_sample_rate[channel] = sample_rate;
stream_buffer_pos[channel] = 0;
if (sample_rate != 0)
stream_sample_length[channel] = 1000000 / sample_rate;
else
stream_sample_length[channel] = 0;
stream_param[channel] = param;
stream_callback[channel] = callback;
set_RC_filter(channel, 0, 0, 0, 0);
return channel;
}
static int make_mixer_table(int voices)
{
int count = voices * 128;
int i;
int gain = 16;
/* allocate memory */
mixer_table = new _ShortPtr(256 * voices * sizeof(short));
/* find the middle of the table */
mixer_lookup = new _ShortPtr(mixer_table, (128 * voices) * 2);
/* fill in the table - 16 bit case */
for (i = 0; i < count; i++)
{
int val = i * gain * 16 / voices;
if (val > 32767) val = 32767;
mixer_lookup.write16(i, (ushort)val);
mixer_lookup.write16(-i, (ushort)-val);
}
return 0;
}
static void generate_adpcm(ADPCMVoice voice, _ShortPtr buffer, int samples)
{
/* if this voice is active */
if (voice.playing != 0)
{
_BytePtr _base = voice._base;
int sample = (int)voice.sample;
int signal = (int)voice.signal;
int count = (int)voice.count;
int step = (int)voice.step;
int val;
/* loop while we still have samples to generate */
while (samples != 0)
{
/* compute the new amplitude and update the current step */
val = _base[sample / 2] >> (((sample & 1) << 2) ^ 4);
signal += diff_lookup[step * 16 + (val & 15)];
/* clamp to the maximum */
if (signal > 2047)
signal = 2047;
else if (signal < -2048)
signal = -2048;
/* adjust the step size and clamp */
step += index_shift[val & 7];
if (step > 48)
step = 48;
else if (step < 0)
step = 0;
/* output to the buffer, scaling by the volume */
buffer.write16(0, (ushort)(signal * voice.volume / 16));
buffer.offset += 2;
samples--;
/* next! */
if (++sample > count)
{
voice.playing = 0;
break;
}
}
/* update the parameters */
voice.sample = (uint)sample;
voice.signal = (uint)signal;
voice.step = (uint)step;
}
/* fill the rest with silence */
while (samples-- != 0)
{
buffer.write16(0, 0);
buffer.offset += 2;
}
}
public static void adpcm_update(int num, _ShortPtr buffer, int length)
{
ADPCMVoice voice = _adpcm[num];
_ShortPtr sample_data = new _ShortPtr(MAX_SAMPLE_CHUNK * 2), curr_data = new _ShortPtr(sample_data);
short prev = voice.last_sample, curr = voice.curr_sample;
uint final_pos;
uint new_samples;
/* finish off the current sample */
if (voice.source_pos > 0)
{
/* interpolate */
while (length > 0 && voice.source_pos < FRAC_ONE)
{
buffer.write16(0, (ushort)((((int)prev * (FRAC_ONE - voice.source_pos)) + ((int)curr * voice.source_pos)) >> FRAC_BITS));
buffer.offset += 2;
voice.source_pos += voice.source_step;
length--;
}
/* if we're over, continue; otherwise, we're done */
if (voice.source_pos >= FRAC_ONE)
voice.source_pos -= FRAC_ONE;
else
return;
}
/* compute how many new samples we need */
final_pos = (uint)(voice.source_pos + length * voice.source_step);
new_samples = (final_pos + FRAC_ONE - 1) >> FRAC_BITS;
if (new_samples > MAX_SAMPLE_CHUNK)
new_samples = MAX_SAMPLE_CHUNK;
/* generate them into our buffer */
generate_adpcm(voice, sample_data, (int)new_samples);
prev = curr;
curr = (short)curr_data.read16(0); curr_data.offset += 2;
/* then sample-rate convert with linear interpolation */
while (length > 0)
{
/* interpolate */
while (length > 0 && voice.source_pos < FRAC_ONE)
{
buffer.write16(0, (ushort)((((int)prev * (FRAC_ONE - voice.source_pos)) + ((int)curr * voice.source_pos)) >> FRAC_BITS));
buffer.offset += 2;
voice.source_pos += voice.source_step;
length--;
}
/* if we're over, grab the next samples */
if (voice.source_pos >= FRAC_ONE)
{
voice.source_pos -= FRAC_ONE;
prev = curr;
curr = (short)curr_data.read16(0); curr_data.offset += 2;
}
}
/* remember the last samples */
voice.last_sample = prev;
voice.curr_sample = curr;
}
void namco_update_stereo(int ch, _ShortPtr[] buffer, int length)
{
throw new Exception();
}
public static void stream_update(int channel, int min_interval)
{
if (Machine.sample_rate == 0 || stream_buffer[channel] == null)
return;
/* get current position based on the timer */
int newpos = sound_scalebufferpos(mixer_need_samples_this_frame(channel, stream_sample_rate[channel]));//SAMPLES_THIS_FRAME(channel));
int buflen = newpos - stream_buffer_pos[channel];
if (buflen * stream_sample_length[channel] > min_interval)
{
if (stream_joined_channels[channel] > 1)
{
_ShortPtr[] buf = new _ShortPtr[MIXER_MAX_CHANNELS];
for (int i = 0; i < stream_joined_channels[channel]; i++)
buf[i] = new _ShortPtr(stream_buffer[channel + i], stream_buffer_pos[channel + i] * sizeof(short));
stream_callback_multi[channel](stream_param[channel], buf, buflen);
for (int i = 0; i < stream_joined_channels[channel]; i++)
stream_buffer_pos[channel + i] += buflen;
}
else
{
_ShortPtr buf = new _ShortPtr(stream_buffer[channel], stream_buffer_pos[channel] * sizeof(short));
stream_callback[channel](stream_param[channel], buf, buflen);
stream_buffer_pos[channel] += buflen;
}
}
}
static void blockmove_opaque16(_BytePtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo, UShortSubArray paldata)
{
//blockmove_opaque8(srcdata, srcwidth, srcheight, srcmodulo, (_BytePtr)dstdata, dstmodulo, paldata);
//return;
int end;
srcmodulo -= srcwidth;
dstmodulo -= srcwidth;
while (srcheight != 0)
{
end = dstdata.offset + srcwidth;
while (dstdata.offset <= end - 8)
{
dstdata.write16(0, paldata[srcdata[0]]);
dstdata.write16(1, paldata[srcdata[1]]);
dstdata.write16(2, paldata[srcdata[2]]);
dstdata.write16(3, paldata[srcdata[3]]);
dstdata.write16(4, paldata[srcdata[4]]);
dstdata.write16(5, paldata[srcdata[5]]);
dstdata.write16(6, paldata[srcdata[6]]);
dstdata.write16(7, paldata[srcdata[7]]);
dstdata.offset += 8 * 2;
srcdata.offset++;
}
while (dstdata.offset < end)
{
dstdata.write16(0, paldata[srcdata[0]]);
srcdata.offset++;
dstdata.offset += 2;
}
srcdata.inc(srcmodulo);
dstdata.inc(dstmodulo);
srcheight--;
}
}
static void blockmove_transmask16(_BytePtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo, UShortSubArray paldata, int transmask) { throw new Exception(); }
public static void tms5220_update(int ch, _ShortPtr buffer, int length)
{
short[] sample_data = new short[MAX_SAMPLE_CHUNK];
ShortSubArray curr_data = new ShortSubArray(sample_data);
short prev = last_sample, curr = curr_sample;
uint final_pos;
uint new_samples;
/* finish off the current sample */
if (source_pos > 0)
{
/* interpolate */
while (length > 0 && source_pos < FRAC_ONE)
{
buffer.write16(0, (ushort)((((int)prev * (FRAC_ONE - source_pos)) + ((int)curr * source_pos)) >> FRAC_BITS));
buffer.offset += 2;
source_pos += source_step;
length--;
}
/* if we're over, continue; otherwise, we're done */
if (source_pos >= FRAC_ONE)
source_pos -= FRAC_ONE;
else
return;
}
/* compute how many new samples we need */
final_pos = (uint)(source_pos + length * source_step);
new_samples = (final_pos + FRAC_ONE - 1) >> FRAC_BITS;
if (new_samples > MAX_SAMPLE_CHUNK)
new_samples = MAX_SAMPLE_CHUNK;
/* generate them into our buffer */
tms5220_process(sample_data, new_samples);
prev = curr;
curr = curr_data[0]; curr_data.offset++;
/* then sample-rate convert with linear interpolation */
while (length > 0)
{
/* interpolate */
while (length > 0 && source_pos < FRAC_ONE)
{
buffer.write16(0, (ushort)((((int)prev * (FRAC_ONE - source_pos)) + ((int)curr * source_pos)) >> FRAC_BITS));
source_pos += source_step;
length--;
}
/* if we're over, grab the next samples */
if (source_pos >= FRAC_ONE)
{
source_pos -= FRAC_ONE;
prev = curr;
curr = curr_data[0]; curr_data.offset++;
}
}
/* remember the last samples */
last_sample = prev;
curr_sample = curr;
}
public static void drawgfxzoom(osd_bitmap dest_bmp, GfxElement gfx, uint code, uint color, bool flipx, bool flipy, int sx, int sy, rectangle clip, int transparency, int transparent_color, int scalex, int scaley)
{
FuncDict["drawgfxzoom"] = "drawgfxzoom";
rectangle myclip = new rectangle();
/* only support TRANSPARENCY_PEN and TRANSPARENCY_COLOR */
if (transparency != TRANSPARENCY_PEN && transparency != TRANSPARENCY_COLOR)
return;
if (transparency == TRANSPARENCY_COLOR)
transparent_color = Machine.pens[transparent_color];
/*
scalex and scaley are 16.16 fixed point numbers
1<<15 : shrink to 50%
1<<16 : uniform scale
1<<17 : double to 200%
*/
if ((Machine.orientation & ORIENTATION_SWAP_XY) != 0)
{
int temp;
temp = sx;
sx = sy;
sy = temp;
var tempb = flipx;
flipx = flipy;
flipy = tempb;
temp = scalex;
scalex = scaley;
scaley = temp;
if (clip != null)
{
/* clip and myclip might be the same, so we need a temporary storage */
temp = clip.min_x;
myclip.min_x = clip.min_y;
myclip.min_y = temp;
temp = clip.max_x;
myclip.max_x = clip.max_y;
myclip.max_y = temp;
clip = myclip;
}
}
if ((Machine.orientation & ORIENTATION_FLIP_X) != 0)
{
sx = dest_bmp.width - ((gfx.width * scalex + 0x7fff) >> 16) - sx;
if (clip != null)
{
int temp;
/* clip and myclip might be the same, so we need a temporary storage */
temp = clip.min_x;
myclip.min_x = dest_bmp.width - 1 - clip.max_x;
myclip.max_x = dest_bmp.width - 1 - temp;
myclip.min_y = clip.min_y;
myclip.max_y = clip.max_y;
clip = myclip;
}
#if !PREROTATE_GFX
flipx = !flipx;
#endif
}
if ((Machine.orientation & ORIENTATION_FLIP_Y) != 0)
{
sy = dest_bmp.height - ((gfx.height * scaley + 0x7fff) >> 16) - sy;
if (clip != null)
{
int temp;
myclip.min_x = clip.min_x;
myclip.max_x = clip.max_x;
/* clip and myclip might be the same, so we need a temporary storage */
temp = clip.min_y;
myclip.min_y = dest_bmp.height - 1 - clip.max_y;
myclip.max_y = dest_bmp.height - 1 - temp;
clip = myclip;
}
#if !PREROTATE_GFX
flipy = !flipy;
#endif
}
/* KW 991012 -- Added code to force clip to bitmap boundary */
if (clip != null)
{
myclip.min_x = clip.min_x;
myclip.max_x = clip.max_x;
myclip.min_y = clip.min_y;
myclip.max_y = clip.max_y;
if (myclip.min_x < 0) myclip.min_x = 0;
if (myclip.max_x >= dest_bmp.width) myclip.max_x = dest_bmp.width - 1;
if (myclip.min_y < 0) myclip.min_y = 0;
if (myclip.max_y >= dest_bmp.height) myclip.max_y = dest_bmp.height - 1;
clip = myclip;
}
/* ASG 980209 -- added 16-bit version */
if (dest_bmp.depth != 16)
{
if (gfx != null && gfx.colortable != null)
{
UShortSubArray pal = new UShortSubArray(gfx.colortable, (int)(gfx.color_granularity * (color % gfx.total_colors))); /* ASG 980209 */
int source_base = (int)((code % gfx.total_elements) * gfx.height);
int sprite_screen_height = (scaley * gfx.height + 0x8000) >> 16;
int sprite_screen_width = (scalex * gfx.width + 0x8000) >> 16;
/* compute sprite increment per screen pixel */
int dx = (gfx.width << 16) / sprite_screen_width;
int dy = (gfx.height << 16) / sprite_screen_height;
int ex = sx + sprite_screen_width;
int ey = sy + sprite_screen_height;
int x_index_base;
int y_index;
if (flipx)
{
x_index_base = (sprite_screen_width - 1) * dx;
dx = -dx;
}
else
{
x_index_base = 0;
}
if (flipy)
{
y_index = (sprite_screen_height - 1) * dy;
dy = -dy;
}
else
{
y_index = 0;
}
if (clip != null)
{
if (sx < clip.min_x)
{ /* clip left */
int pixels = clip.min_x - sx;
sx += pixels;
x_index_base += pixels * dx;
}
if (sy < clip.min_y)
{ /* clip top */
int pixels = clip.min_y - sy;
sy += pixels;
y_index += pixels * dy;
}
/* NS 980211 - fixed incorrect clipping */
if (ex > clip.max_x + 1)
{ /* clip right */
int pixels = ex - clip.max_x - 1;
ex -= pixels;
}
if (ey > clip.max_y + 1)
{ /* clip bottom */
int pixels = ey - clip.max_y - 1;
ey -= pixels;
}
}
if (ex > sx)
{ /* skip if inner loop doesn't draw anything */
int y;
/* case 1: TRANSPARENCY_PEN */
if (transparency == TRANSPARENCY_PEN)
{
for (y = sy; y < ey; y++)
{
_BytePtr source = new _BytePtr(gfx.gfxdata, (source_base + (y_index >> 16)) * gfx.line_modulo);
_BytePtr dest = dest_bmp.line[y];
int x, x_index = x_index_base;
for (x = sx; x < ex; x++)
{
int c = source[x_index >> 16];
if (c != transparent_color) dest[x] = (byte)pal[c];
x_index += dx;
}
y_index += dy;
}
}
/* case 2: TRANSPARENCY_COLOR */
else if (transparency == TRANSPARENCY_COLOR)
{
for (y = sy; y < ey; y++)
{
_BytePtr source = new _BytePtr(gfx.gfxdata, (source_base + (y_index >> 16)) * gfx.line_modulo);
_BytePtr dest = dest_bmp.line[y];
int x, x_index = x_index_base;
for (x = sx; x < ex; x++)
{
int c = pal[source[x_index >> 16]];
if (c != transparent_color) dest[x] = (byte)c;
x_index += dx;
}
y_index += dy;
}
}
}
}
}
/* ASG 980209 -- new 16-bit part */
else
{
if (gfx != null && gfx.colortable != null)
{
UShortSubArray pal = new UShortSubArray(gfx.colortable, (int)(gfx.color_granularity * (color % gfx.total_colors))); /* ASG 980209 */
int source_base = (int)((code % gfx.total_elements) * gfx.height);
int sprite_screen_height = (scaley * gfx.height + 0x8000) >> 16;
int sprite_screen_width = (scalex * gfx.width + 0x8000) >> 16;
/* compute sprite increment per screen pixel */
int dx = (gfx.width << 16) / sprite_screen_width;
int dy = (gfx.height << 16) / sprite_screen_height;
int ex = sx + sprite_screen_width;
int ey = sy + sprite_screen_height;
int x_index_base;
int y_index;
if (flipx)
{
x_index_base = (sprite_screen_width - 1) * dx;
dx = -dx;
}
else
{
x_index_base = 0;
}
if (flipy)
{
y_index = (sprite_screen_height - 1) * dy;
dy = -dy;
}
else
{
y_index = 0;
}
if (clip != null)
{
if (sx < clip.min_x)
{ /* clip left */
int pixels = clip.min_x - sx;
sx += pixels;
x_index_base += pixels * dx;
}
if (sy < clip.min_y)
{ /* clip top */
int pixels = clip.min_y - sy;
sy += pixels;
y_index += pixels * dy;
}
/* NS 980211 - fixed incorrect clipping */
if (ex > clip.max_x + 1)
{ /* clip right */
int pixels = ex - clip.max_x - 1;
ex -= pixels;
}
if (ey > clip.max_y + 1)
{ /* clip bottom */
int pixels = ey - clip.max_y - 1;
ey -= pixels;
}
}
if (ex > sx)
{ /* skip if inner loop doesn't draw anything */
int y;
/* case 1: TRANSPARENCY_PEN */
if (transparency == TRANSPARENCY_PEN)
{
for (y = sy; y < ey; y++)
{
_BytePtr source = new _BytePtr(gfx.gfxdata, (source_base + (y_index >> 16)) * gfx.line_modulo);
_ShortPtr dest = new _ShortPtr(dest_bmp.line[y]);
int x, x_index = x_index_base;
for (x = sx; x < ex; x++)
{
int c = source[x_index >> 16];
if (c != transparent_color) dest[x] = (byte)pal[c];
x_index += dx;
}
y_index += dy;
}
}
/* case 2: TRANSPARENCY_COLOR */
else if (transparency == TRANSPARENCY_COLOR)
{
for (y = sy; y < ey; y++)
{
_BytePtr source = new _BytePtr(gfx.gfxdata, (source_base + (y_index >> 16)) * gfx.line_modulo);
_ShortPtr dest = new _ShortPtr(dest_bmp.line[y]);
int x, x_index = x_index_base;
for (x = sx; x < ex; x++)
{
int c = pal[source[x_index >> 16]];
if (c != transparent_color) dest.write16(x, (ushort)c);
x_index += dx;
}
y_index += dy;
}
}
}
}
}
}
static void SEGAPCMUpdate(int num, _ShortPtr[] buffer, int length)
{
throw new Exception();
}
static void draw_tile(osd_bitmap pixmap, int col, int row, int tile_width, int tile_height, _BytePtr pendata, UShortSubArray paldata, byte flags)
{
int x, sx = tile_width * col;
int sy, y1, y2, dy;
int pi = 0;
if (Machine.scrbitmap.depth == 16)
{
if ((flags & TILE_FLIPY) != 0)
{
y1 = tile_height * row + tile_height - 1;
y2 = y1 - tile_height;
dy = -1;
}
else
{
y1 = tile_height * row;
y2 = y1 + tile_height;
dy = 1;
}
if ((flags & TILE_FLIPX) != 0)
{
tile_width--;
for (sy = y1; sy != y2; sy += dy)
{
_ShortPtr dest = new _ShortPtr(pixmap.line[sy], sx);
for (x = tile_width; x >= 0; x--)
{
dest.write16(x, paldata[pendata[pi++]]);
}
}
}
else
{
for (sy = y1; sy != y2; sy += dy)
{
_ShortPtr dest = new _ShortPtr(pixmap.line[sy], sx);
for (x = 0; x < tile_width; x++)
{
dest.write16(x, paldata[pendata[pi++]]);
}
}
}
}
else
{
if ((flags & TILE_FLIPY) != 0)
{
y1 = tile_height * row + tile_height - 1;
y2 = y1 - tile_height;
dy = -1;
}
else
{
y1 = tile_height * row;
y2 = y1 + tile_height;
dy = 1;
}
if ((flags & TILE_FLIPX) != 0)
{
tile_width--;
for (sy = y1; sy != y2; sy += dy)
{
_BytePtr dest = new _BytePtr(pixmap.line[sy], sx);
for (x = tile_width; x >= 0; x--)
{ dest[x] = (byte)paldata[pendata[pi++]]; }
}
}
else
{
for (sy = y1; sy != y2; sy += dy)
{
_BytePtr dest = new _BytePtr(pixmap.line[sy], sx);
for (x = 0; x < tile_width; x++)
{ dest[x] = (byte)paldata[pendata[pi++]]; }
}
}
}
}
public static void YM3812UpdateOne(FM_OPL OPL, _ShortPtr buffer, int length)
{
int i;
int data;
_ShortPtr buf = buffer;
uint amsCnt = (uint)OPL.amsCnt;
uint vibCnt = (uint)OPL.vibCnt;
byte rythm = (byte)(OPL.rythm & 0x20);
OPL_CH CH;
int R_CH;
if ((object)OPL != cur_chip)
{
cur_chip = OPL;
/* channel pointers */
S_CH = OPL.P_CH;
E_CH = 9;// S_CH[9];
/* rythm slot */
SLOT7_1 = S_CH[7].SLOT[SLOT1];
SLOT7_2 = S_CH[7].SLOT[SLOT2];
SLOT8_1 = S_CH[8].SLOT[SLOT1];
SLOT8_2 = S_CH[8].SLOT[SLOT2];
/* LFO state */
amsIncr = OPL.amsIncr;
vibIncr = OPL.vibIncr;
ams_table = OPL.ams_table;
vib_table = OPL.vib_table;
}
R_CH = rythm != 0 ? 6 : E_CH;
for (i = 0; i < length; i++)
{
/* channel A channel B channel C */
/* LFO */
ams = ams_table[(int)((amsCnt += (uint)amsIncr) >> AMS_SHIFT)];
vib = vib_table[(int)((vibCnt += (uint)vibIncr) >> VIB_SHIFT)];
outd[0] = 0;
/* FM part */
for (int k = 0; k != R_CH; k++)
{
CH = S_CH[k];
//for(CH=S_CH ; CH < R_CH ; CH++)
OPL_CALC_CH(CH);
}
/* Rythn part */
if (rythm != 0)
OPL_CALC_RH(S_CH);
/* limit check */
data = Limit(outd[0], OPL_MAXOUT, OPL_MINOUT);
/* store to sound buffer */
buf.write16(i, (ushort)(data >> OPL_OUTSB));
}
OPL.amsCnt = (int)amsCnt;
OPL.vibCnt = (int)vibCnt;
}
public static void YM2203UpdateOne(int num, _ShortPtr buffer, int length)
{
YM2203 F2203 = (FM2203[num]);
FM_OPN OPN = (FM2203[num].OPN);
int i;
FM_CH ch;
_ShortPtr buf = new _ShortPtr(buffer);
cur_chip = F2203;
State = F2203.OPN.ST;
cch[0] = F2203.CH[0];
cch[1] = F2203.CH[1];
cch[2] = F2203.CH[2];
#if FM_LFO_SUPPORT
/* LFO */
lfo_amd = 0;
lfo_pmd = 0;
#endif
/* frequency counter channel A */
CALC_FCOUNT(cch[0]);
/* frequency counter channel B */
CALC_FCOUNT(cch[1]);
/* frequency counter channel C */
if ((State.mode & 0xc0) != 0)
{
/* 3SLOT MODE */
if (cch[2].SLOT[SLOT1].Incr == unchecked((uint)-1))
{
/* 3 slot mode */
CALC_FCSLOT(cch[2].SLOT[SLOT1], (int)OPN.SL3.fc[1], OPN.SL3.kcode[1]);
CALC_FCSLOT(cch[2].SLOT[SLOT2], (int)OPN.SL3.fc[2], OPN.SL3.kcode[2]);
CALC_FCSLOT(cch[2].SLOT[SLOT3], (int)OPN.SL3.fc[0], OPN.SL3.kcode[0]);
CALC_FCSLOT(cch[2].SLOT[SLOT4], (int)cch[2].fc, cch[2].kcode);
}
}
else CALC_FCOUNT(cch[2]);
for (i = 0; i < length; i++)
{
/* channel A channel B channel C */
out_ch[OUTD_CENTER] = 0;
/* calcrate FM */
//for( ch=cch[0] ; ch <= cch[2] ; ch++)
for (int kk = 0; kk < 2; kk++)
FM_CALC_CH(cch[kk]);
/* limit check */
Limit(ref out_ch[OUTD_CENTER], FM_MAXOUT, FM_MINOUT);
/* store to sound buffer */
buf.write16(i, (ushort)(out_ch[OUTD_CENTER] >> FM_OUTSB));
/* timer controll */
INTERNAL_TIMER_A(State, cch[2]);
}
INTERNAL_TIMER_B(State, length);
}
public static void OPMUpdateOne(int num, _ShortPtr[] buffer, int length)
{
YM2151 OPM = (FMOPM[num]);
int i;
int amd, pmd;
FM_CH ch;
_ShortPtr bufL, bufR;
/* set bufer */
bufL = buffer[0];
bufR = buffer[1];
if ((object)OPM != cur_chip)
{
cur_chip = OPM;
State = OPM.ST;
/* channel pointer */
cch[0] = OPM.CH[0];
cch[1] = OPM.CH[1];
cch[2] = OPM.CH[2];
cch[3] = OPM.CH[3];
cch[4] = OPM.CH[4];
cch[5] = OPM.CH[5];
cch[6] = OPM.CH[6];
cch[7] = OPM.CH[7];
/* ch7.op4 noise mode / step */
NoiseIncr = OPM.NoiseIncr;
NoiseCnt = OPM.NoiseCnt;
#if FM_LFO_SUPPORT
/* LFO */
LFOCnt = OPM.LFOCnt;
//LFOIncr = OPM.LFOIncr;
if (LFOIncr == 0) { lfo_amd = 0; lfo_pmd = 0; }
LFO_wave = OPM.wavetype;
#endif
}
amd = OPM.amd;
pmd = OPM.pmd;
if (amd == 0 && pmd == 0)
LFOIncr = 0;
else
LFOIncr = OPM.LFOIncr;
OPM_CALC_FCOUNT(OPM, cch[0]);
OPM_CALC_FCOUNT(OPM, cch[1]);
OPM_CALC_FCOUNT(OPM, cch[2]);
OPM_CALC_FCOUNT(OPM, cch[3]);
OPM_CALC_FCOUNT(OPM, cch[4]);
OPM_CALC_FCOUNT(OPM, cch[5]);
OPM_CALC_FCOUNT(OPM, cch[6]);
/* CSM check */
OPM_CALC_FCOUNT(OPM, cch[7]);
for (i = 0; i < length; i++)
{
#if FM_LFO_SUPPORT
/* LFO */
if (LFOIncr != 0)
{
int depth = LFO_wave[(int)((LFOCnt += LFOIncr) >> LFO_SHIFT)];
lfo_amd = (uint)(depth * amd);
lfo_pmd = (depth - (LFO_RATE / 127 / 2)) * pmd;
}
#endif
/* clear output acc. */
out_ch[OUTD_LEFT] = out_ch[OUTD_RIGHT] = out_ch[OUTD_CENTER] = 0;
/* calcrate channel output */
//for(ch = cch[0] ; ch <= cch[6] ; ch++)
for (int k = 0; k < 6; k++)
{
ch = cch[k];
FM_CALC_CH(ch);
OPM_CALC_CH7(cch[7]);
/* buffering */
//FM_BUFFERING_STEREO;
#if FM_STEREO_MIX
/* stereo mixing */
{
/* get left & right output with clipping */
out_ch[OUTD_LEFT] += out_ch[OUTD_CENTER];
Limit( out_ch[OUTD_LEFT] , FM_MAXOUT, FM_MINOUT );
out_ch[OUTD_RIGHT] += out_ch[OUTD_CENTER];
Limit( out_ch[OUTD_RIGHT], FM_MAXOUT, FM_MINOUT );
/* buffering */
((FMSAMPLE_MIX *)bufL)[i] = ((out_ch[OUTD_LEFT]>>FM_OUTSB)<<FM_OUTPUT_BIT)|(out_ch[OUTD_RIGHT]>>FM_OUTSB);
}
#else
/* stereo separate */
{
/* get left & right output with clipping */
out_ch[OUTD_LEFT] += out_ch[OUTD_CENTER];
Limit(ref out_ch[OUTD_LEFT], FM_MAXOUT, FM_MINOUT);
out_ch[OUTD_RIGHT] += out_ch[OUTD_CENTER];
Limit(ref out_ch[OUTD_RIGHT], FM_MAXOUT, FM_MINOUT);
/* buffering */
bufL.write16(i, (ushort)(out_ch[OUTD_LEFT] >> FM_OUTSB));
bufR.write16(i, (ushort)(out_ch[OUTD_RIGHT] >> FM_OUTSB));
}
#endif
/* timer A controll */
INTERNAL_TIMER_A(State, cch[7]);
}
INTERNAL_TIMER_B(State, length);
OPM.NoiseCnt = NoiseCnt;
#if FM_LFO_SUPPORT
OPM.LFOCnt = LFOCnt;
#endif
}
}
public void streams_sh_update()
{
if (Machine.sample_rate == 0) return;
/* update all the output buffers */
for (int channel = 0; channel < MIXER_MAX_CHANNELS; channel += stream_joined_channels[channel])
{
if (stream_buffer[channel] != null)
{
int newpos = mixer_need_samples_this_frame(channel, stream_sample_rate[(channel)]);
int buflen = newpos - stream_buffer_pos[channel];
if (stream_joined_channels[channel] > 1)
{
_ShortPtr[] buf = new _ShortPtr[MIXER_MAX_CHANNELS];
if (buflen > 0)
{
for (int i = 0; i < stream_joined_channels[channel]; i++)
buf[i] = new _ShortPtr(stream_buffer[channel + i], stream_buffer_pos[channel + i]*sizeof(short));
stream_callback_multi[channel](stream_param[channel], buf, buflen);
}
for (int i = 0; i < stream_joined_channels[channel]; i++)
stream_buffer_pos[channel + i] = 0;
for (int i = 0; i < stream_joined_channels[channel]; i++)
apply_RC_filter(channel + i, stream_buffer[channel + i], buflen, stream_sample_rate[channel + i]);
}
else
{
if (buflen > 0)
{
_ShortPtr buf= new _ShortPtr(stream_buffer[channel], stream_buffer_pos[channel]*sizeof(short));
stream_callback[channel](stream_param[channel], buf, buflen);
}
stream_buffer_pos[channel] = 0;
apply_RC_filter(channel, stream_buffer[channel], buflen, stream_sample_rate[channel]);
}
}
}
for (int channel = 0; channel < MIXER_MAX_CHANNELS; channel += stream_joined_channels[channel])
{
if (stream_buffer[channel] != null)
{
for (int i = 0; i < stream_joined_channels[channel]; i++)
mixer_play_streamed_sample_16(channel + i,
stream_buffer[channel + i], sizeof(short) *
mixer_need_samples_this_frame((channel + i), stream_sample_rate[(channel + i)]),
stream_sample_rate[channel]);
}
}
}
static void YM3812UpdateHandler(int n, _ShortPtr buf, int length)
{
FMOPL.YM3812UpdateOne(F3812[n], buf, length);
}
public static void fillbitmap(osd_bitmap dest, int pen, rectangle clip)
{
FuncDict["fillbitmap"] = "fillbitmap";
rectangle myclip = new rectangle();
if ((Machine.orientation & ORIENTATION_SWAP_XY) != 0)
{
if (clip != null)
{
myclip.min_x = clip.min_y;
myclip.max_x = clip.max_y;
myclip.min_y = clip.min_x;
myclip.max_y = clip.max_x;
clip = myclip;
}
}
if ((Machine.orientation & ORIENTATION_FLIP_X) != 0)
{
if (clip != null)
{
int temp = clip.min_x;
myclip.min_x = dest.width - 1 - clip.max_x;
myclip.max_x = dest.width - 1 - temp;
myclip.min_y = clip.min_y;
myclip.max_y = clip.max_y;
clip = myclip;
}
}
if ((Machine.orientation & ORIENTATION_FLIP_Y) != 0)
{
if (clip != null)
{
myclip.min_x = clip.min_x;
myclip.max_x = clip.max_x;
int temp = clip.min_y;
myclip.min_y = dest.height - 1 - clip.max_y;
myclip.max_y = dest.height - 1 - temp;
clip = myclip;
}
}
int sx = 0;
int ex = dest.width - 1;
int sy = 0;
int ey = dest.height - 1;
if (clip != null && sx < clip.min_x) sx = clip.min_x;
if (clip != null && ex > clip.max_x) ex = clip.max_x;
if (sx > ex) return;
if (clip != null && sy < clip.min_y) sy = clip.min_y;
if (clip != null && ey > clip.max_y) ey = clip.max_y;
if (sy > ey) return;
osd_mark_dirty(sx, sy, ex, ey, 0); /* ASG 971011 */
/* ASG 980211 */
if (dest.depth == 16)
{
if ((pen >> 8) == (pen & 0xff))
{
for (int y = sy; y <= ey; y++)
{
for (int k = 0; k < (ex - sx + 1) * 2; k++)
dest.line[y][sx * 2 + k] = (byte)(pen & 0xff);
}
//memset(&dest.line[y][sx*2],pen&0xff,(ex-sx+1)*2);
}
else
{
_ShortPtr sp = new _ShortPtr(dest.line[sy]);
int x;
for (x = sx; x <= ex; x++)
sp.write16(x, (ushort)pen);
sp.offset += sx * 2;
for (int y = sy + 1; y <= ey; y++)
{
Buffer.BlockCopy(sp.buffer, sp.offset, dest.line[y].buffer, sx * 2, (ex - sx + 1) * 2);
}
//memcpy(&dest.line[y][sx*2],sp,(ex-sx+1)*2);
}
}
else
{
for (int y = sy; y <= ey; y++)
{
for (int k = 0; k < ex - sx + 1; k++) dest.line[y][sx + k] = (byte)pen;
}
}
}
static void blockmove_opaque_noremap_flipx16(_ShortPtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo) { throw new Exception(); }
static void drawgfx_core16(osd_bitmap dest, GfxElement gfx, uint code, uint color, bool flipx, bool flipy, int sx, int sy, rectangle clip, int transparency, int transparent_color)
{
int ox; int oy; int ex; int ey;
/* check bounds */
ox = sx; oy = sy;
ex = sx + gfx.width - 1; if (sx < 0) sx = 0;
if (clip != null && sx < clip.min_x) sx = clip.min_x;
if (ex >= dest.width) ex = dest.width - 1;
if (clip != null && ex > clip.max_x) ex = clip.max_x;
if (sx > ex) return; ey = sy + gfx.height - 1;
if (sy < 0) sy = 0;
if (clip != null && sy < clip.min_y) sy = clip.min_y;
if (ey >= dest.height) ey = dest.height - 1;
if (clip != null && ey > clip.max_y) ey = clip.max_y;
if (sy > ey) return; osd_mark_dirty(sx, sy, ex, ey, 0); /* ASG 971011 */
{
_BytePtr sd = new _BytePtr(gfx.gfxdata, (int)(code * gfx.char_modulo)); /* source data */
int sw = ex - sx + 1; /* source width */
int sh = ey - sy + 1; /* source height */
int sm = gfx.line_modulo; /* source modulo */
_ShortPtr dd = new _ShortPtr(dest.line[sy], sx); /* dest data */
int dm = dest.line[1].offset - dest.line[0].offset; /* dest modulo */
UShortSubArray paldata = new UShortSubArray(gfx.colortable, (int)((gfx.color_granularity * color)));
if (flipx)
{
sd.offset += gfx.width - 1 - (sx - ox);
}
else
sd.offset += (sx - ox); if (flipy)
{
sd.offset += sm * (gfx.height - 1 - (sy - oy));
sm = -sm;
}
else
sd.offset += sm * (sy - oy); switch (transparency)
{
case TRANSPARENCY_NONE:
if (flipx) blockmove_opaque_flipx16(sd, sw, sh, sm, dd, dm, paldata);
else
blockmove_opaque16(sd, sw, sh, sm, dd, dm, paldata);
break;
case TRANSPARENCY_PEN:
if (flipx)
blockmove_transpen_flipx16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
else
blockmove_transpen16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
break;
case TRANSPARENCY_PENS: if (flipx)
blockmove_transmask_flipx16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
else
blockmove_transmask16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
break;
case TRANSPARENCY_COLOR: if (flipx)
blockmove_transcolor_flipx16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
else
blockmove_transcolor16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
break;
case TRANSPARENCY_THROUGH: if (flipx)
blockmove_transthrough_flipx16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
else
blockmove_transthrough16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
break;
case TRANSPARENCY_PEN_TABLE: if (flipx)
blockmove_pen_table_flipx16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
else
blockmove_pen_table16(sd, sw, sh, sm, dd, dm, paldata, transparent_color);
break;
}
}
}
public override int start(xnamame036.mame.Mame.MachineSound msound)
{
string mono_name = "NAMCO sound";
string[] stereo_names = { "NAMCO sound left", "NAMCO sound right" };
Namco_interface intf = (Namco_interface)msound.sound_interface;
namco_clock = intf.samplerate;
sample_rate = Mame.Machine.sample_rate;
/* get stream channels */
if (intf.stereo)
{
int[] vol = new int[2];
vol[1] = Mame.MIXER(intf.volume, Mame.MIXER_PAN_RIGHT);
vol[0] = Mame.MIXER(intf.volume, Mame.MIXER_PAN_LEFT);
stream = Mame.stream_init_multi(2, stereo_names, vol, intf.samplerate, 0, namco_update_stereo);
}
else
{
stream = Mame.stream_init(mono_name, intf.volume, intf.samplerate, 0, namco_update_mono);
}
/* allocate a pair of buffers to mix into - 1 second's worth should be more than enough */
mixer_buffer = new _ShortPtr(2 * intf.samplerate * sizeof(short) );
mixer_buffer_2 = new _ShortPtr(mixer_buffer, intf.samplerate * sizeof(short));
/* build the mixer table */
make_mixer_table(intf.voices);
/* extract globals from the interface */
num_voices = intf.voices;
last_channel = num_voices;
if (intf.region == -1)
{
sound_prom = namco_wavedata;
samples_per_byte = 2; /* first 4 high bits, then low 4 bits */
}
else
{
sound_prom = Mame.memory_region(intf.region);
samples_per_byte = 1; /* use only low 4 bits */
}
/* start with sound enabled, many games don't have a sound enable register */
sound_enable = true;
/* reset all the voices */
for (int i = 0; i < last_channel; i++)
//for (voice = channel_list; voice < last_channel; voice++)
{
channel_list[i] = new sound_channel();
channel_list[i].frequency = 0;
channel_list[i].volume[0] = channel_list[i].volume[1] = 0;
channel_list[i].wave = sound_prom;
channel_list[i].counter = 0;
channel_list[i].noise_sw = 0;
channel_list[i].noise_state = 0;
channel_list[i].noise_seed = 1;
channel_list[i].noise_counter = 0;
}
return 0;
}
static void blockmove_opaque_flipx16(_BytePtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo, UShortSubArray paldata) { throw new Exception(); }
void apply_RC_filter(int channel, _ShortPtr buf, int len, int sample_rate)
{
if (c[channel] == 0) return; /* filter disabled */
float R1 = r1[channel];
float R2 = r2[channel];
float R3 = r3[channel];
float C = (float)(c[channel] * 1E-12); /* convert pF to F */
/* Cut Frequency = 1/(2*Pi*Req*C) */
float Req = (R1 * (R2 + R3)) / (R1 + R2 + R3);
int K = (int)(0x10000 * Math.Exp(-1 / (Req * C) / sample_rate));
buf.write16(0, (ushort)(buf.read16(0) + (memory[channel] - buf.read16(0)) * K / 0x10000));
for (int i = 1; i < len; i++)
buf.write16(i, (ushort)(buf.read16(i) + (buf.read16(i - 1) - buf.read16(i)) * K / 0x10000));
memory[channel] = buf.read16(len - 1);
}
static void blockmove_pen_table_flipx16(_BytePtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo, UShortSubArray paldata, int transcolor) { throw new Exception(); }
void namco_update_mono(int ch, _ShortPtr buffer, int length)
{
_ShortPtr mix;
/* if no sound, we're done */
if (!sound_enable)
{
Array.Clear(buffer.buffer, buffer.offset, length*2);
return;
}
/* zap the contents of the mixer buffer */
Array.Clear(mixer_buffer.buffer, mixer_buffer.offset, length * 2);
/* loop over each voice and add its contribution */
for (int voice=0;voice<last_channel;voice++)//; voice < last_channel; voice++)
{
int f = channel_list[voice].frequency;
int v = channel_list[voice].volume[0];
mix = new _ShortPtr(mixer_buffer);
if (channel_list[voice].noise_sw != 0)
{
/* only update if we have non-zero volume and frequency */
if (v != 0 && (f & 0xff) != 0)
{
float fbase = (float)sample_rate / (float)namco_clock;
int delta = (int)((float)((f & 0xff) << 4) * fbase);
int c = channel_list[voice].noise_counter;
/* add our contribution */
for (int i = 0; i < length; i++)
{
int noise_data;
int cnt;
if (channel_list[voice].noise_state != 0)
noise_data = 0x07;
else
noise_data = -0x07;
mix.write16(0, (ushort)((short)mix.read16(0) + noise_data * (v >> 1)));
mix.offset += 2;
c += delta;
cnt = (c >> 12);
c &= (1 << 12) - 1;
for (; cnt > 0; cnt--)
{
if (((channel_list[voice].noise_seed + 1) & 2) != 0) channel_list[voice].noise_state ^= 1;
if ((channel_list[voice].noise_seed & 1) != 0) channel_list[voice].noise_seed ^= 0x28000;
channel_list[voice].noise_seed >>= 1;
}
}
/* update the counter for this voice */
channel_list[voice].noise_counter = c;
}
}
else
{
/* only update if we have non-zero volume and frequency */
if (v != 0 && f != 0)
{
int c = channel_list[voice].counter;
/* add our contribution */
for (int i = 0; i < length; i++)
{
c += f;
int offs = (c >> 15) & 0x1f;
//ushort currentmix = mix.read16(0);
if (samples_per_byte == 1) /* use only low 4 bits */
{
mix.write16(0, (ushort)((short)mix.read16(0) + ((channel_list[voice].wave[offs] & 0x0f) - 8) * v));
mix.offset += 2;
}
else /* use full byte, first the high 4 bits, then the low 4 bits */
{
if ((offs & 1) != 0)
{
mix.write16(0, (ushort)((short)mix.read16(0) + ((channel_list[voice].wave[offs >> 1] & 0x0f) - 8) * v));
mix.offset += 2;
}
else
{
mix.write16(0, (ushort)((short)mix.read16(0) + (((channel_list[voice].wave[offs >> 1] >> 4) & 0x0f) - 8) * v));
mix.offset += 2;
}
}
}
/* update the counter for this voice */
channel_list[voice].counter = c;
}
}
}
/* mix it down */
mix = new _ShortPtr(mixer_buffer);
for (int i = 0; i < length; i++)
{
buffer.write16(0, (ushort)mixer_lookup[mixer_lookup_middle+(short)mix.read16(0)]);
buffer.offset += 2;
mix.offset += 2;
}
}
static void blockmove_transthrough_noremap_flipx16(_ShortPtr srcdata, int srcwidth, int srcheight, int srcmodulo, _ShortPtr dstdata, int dstmodulo, int transcolor) { throw new Exception(); }
void AY8910Update(int chip, _ShortPtr[] buffer, int length)
{
AY8910 PSG = AYPSG[chip];
_ShortPtr buf1, buf2, buf3;
int outn;
buf1 = buffer[0];
buf2 = buffer[1];
buf3 = buffer[2];
/* The 8910 has three outputs, each output is the mix of one of the three */
/* tone generators and of the (single) noise generator. The two are mixed */
/* BEFORE going into the DAC. The formula to mix each channel is: */
/* (ToneOn | ToneDisable) & (NoiseOn | NoiseDisable). */
/* Note that this means that if both tone and noise are disabled, the output */
/* is 1, not 0, and can be modulated changing the volume. */
/* If the channels are disabled, set their output to 1, and increase the */
/* counter, if necessary, so they will not be inverted during this update. */
/* Setting the output to 1 is necessary because a disabled channel is locked */
/* into the ON state (see above); and it has no effect if the volume is 0. */
/* If the volume is 0, increase the counter, but don't touch the output. */
if ((PSG.Regs[AY_ENABLE] & 0x01) != 0)
{
if (PSG.CountA <= length * STEP) PSG.CountA += length * STEP;
PSG.OutputA = 1;
}
else if (PSG.Regs[AY_AVOL] == 0)
{
/* note that I do count += length, NOT count = length + 1. You might think */
/* it's the same since the volume is 0, but doing the latter could cause */
/* interferencies when the program is rapidly modulating the volume. */
if (PSG.CountA <= length * STEP) PSG.CountA += length * STEP;
}
if ((PSG.Regs[AY_ENABLE] & 0x02) != 0)
{
if (PSG.CountB <= length * STEP) PSG.CountB += length * STEP;
PSG.OutputB = 1;
}
else if (PSG.Regs[AY_BVOL] == 0)
{
if (PSG.CountB <= length * STEP) PSG.CountB += length * STEP;
}
if ((PSG.Regs[AY_ENABLE] & 0x04) != 0)
{
if (PSG.CountC <= length * STEP) PSG.CountC += length * STEP;
PSG.OutputC = 1;
}
else if (PSG.Regs[AY_CVOL] == 0)
{
if (PSG.CountC <= length * STEP) PSG.CountC += length * STEP;
}
/* for the noise channel we must not touch OutputN - it's also not necessary */
/* since we use outn. */
if ((PSG.Regs[AY_ENABLE] & 0x38) == 0x38) /* all off */
if (PSG.CountN <= length * STEP) PSG.CountN += length * STEP;
outn = (PSG.OutputN | PSG.Regs[AY_ENABLE]);
/* buffering loop */
while (length != 0)
{
int vola, volb, volc;
int left;
/* vola, volb and volc keep track of how long each square wave stays */
/* in the 1 position during the sample period. */
vola = volb = volc = 0;
left = STEP;
do
{
int nextevent;
if (PSG.CountN < left) nextevent = PSG.CountN;
else nextevent = left;
if ((outn & 0x08) != 0)
{
if (PSG.OutputA != 0) vola += PSG.CountA;
PSG.CountA -= nextevent;
/* PeriodA is the half period of the square wave. Here, in each */
/* loop I add PeriodA twice, so that at the end of the loop the */
/* square wave is in the same status (0 or 1) it was at the start. */
/* vola is also incremented by PeriodA, since the wave has been 1 */
/* exactly half of the time, regardless of the initial position. */
/* If we exit the loop in the middle, OutputA has to be inverted */
/* and vola incremented only if the exit status of the square */
/* wave is 1. */
while (PSG.CountA <= 0)
{
PSG.CountA += PSG.PeriodA;
if (PSG.CountA > 0)
{
PSG.OutputA ^= 1;
if (PSG.OutputA != 0) vola += PSG.PeriodA;
break;
}
PSG.CountA += PSG.PeriodA;
vola += PSG.PeriodA;
}
if (PSG.OutputA != 0) vola -= PSG.CountA;
}
else
{
PSG.CountA -= nextevent;
while (PSG.CountA <= 0)
{
PSG.CountA += PSG.PeriodA;
if (PSG.CountA > 0)
{
PSG.OutputA ^= 1;
break;
}
PSG.CountA += PSG.PeriodA;
}
}
if ((outn & 0x10) != 0)
{
if (PSG.OutputB != 0) volb += PSG.CountB;
PSG.CountB -= nextevent;
while (PSG.CountB <= 0)
{
PSG.CountB += PSG.PeriodB;
if (PSG.CountB > 0)
{
PSG.OutputB ^= 1;
if (PSG.OutputB != 0) volb += PSG.PeriodB;
break;
}
PSG.CountB += PSG.PeriodB;
volb += PSG.PeriodB;
}
if (PSG.OutputB != 0) volb -= PSG.CountB;
}
else
{
PSG.CountB -= nextevent;
while (PSG.CountB <= 0)
{
PSG.CountB += PSG.PeriodB;
if (PSG.CountB > 0)
{
PSG.OutputB ^= 1;
break;
}
PSG.CountB += PSG.PeriodB;
}
}
if ((outn & 0x20) != 0)
{
if (PSG.OutputC != 0) volc += PSG.CountC;
PSG.CountC -= nextevent;
while (PSG.CountC <= 0)
{
PSG.CountC += PSG.PeriodC;
if (PSG.CountC > 0)
{
PSG.OutputC ^= 1;
if (PSG.OutputC != 0) volc += PSG.PeriodC;
break;
}
PSG.CountC += PSG.PeriodC;
volc += PSG.PeriodC;
}
if (PSG.OutputC != 0) volc -= PSG.CountC;
}
else
{
PSG.CountC -= nextevent;
while (PSG.CountC <= 0)
{
PSG.CountC += PSG.PeriodC;
if (PSG.CountC > 0)
{
PSG.OutputC ^= 1;
break;
}
PSG.CountC += PSG.PeriodC;
}
}
PSG.CountN -= nextevent;
if (PSG.CountN <= 0)
{
/* Is noise output going to change? */
if (((PSG.RNG + 1) & 2) != 0) /* (bit0^bit1)? */
{
PSG.OutputN = (byte)~PSG.OutputN;
outn = (PSG.OutputN | PSG.Regs[AY_ENABLE]);
}
/* The Random Number Generator of the 8910 is a 17-bit shift */
/* register. The input to the shift register is bit0 XOR bit2 */
/* (bit0 is the output). */
/* The following is a fast way to compute bit 17 = bit0^bit2. */
/* Instead of doing all the logic operations, we only check */
/* bit 0, relying on the fact that after two shifts of the */
/* register, what now is bit 2 will become bit 0, and will */
/* invert, if necessary, bit 16, which previously was bit 18. */
if ((PSG.RNG & 1) != 0) PSG.RNG ^= 0x28000;
PSG.RNG >>= 1;
PSG.CountN += PSG.PeriodN;
}
left -= nextevent;
} while (left > 0);
/* update envelope */
if (PSG.Holding == 0)
{
PSG.CountE -= STEP;
if (PSG.CountE <= 0)
{
do
{
PSG.CountEnv--;
PSG.CountE += PSG.PeriodE;
} while (PSG.CountE <= 0);
/* check envelope current position */
if (PSG.CountEnv < 0)
{
if (PSG.Hold != 0)
{
if (PSG.Alternate != 0)
PSG.Attack ^= 0x1f;
PSG.Holding = 1;
PSG.CountEnv = 0;
}
else
{
/* if CountEnv has looped an odd number of times (usually 1), */
/* invert the output. */
if (PSG.Alternate != 0 && (PSG.CountEnv & 0x20) != 0)
PSG.Attack ^= 0x1f;
PSG.CountEnv &= 0x1f;
}
}
PSG.VolE = PSG.VolTable[PSG.CountEnv ^ PSG.Attack];
/* reload volume */
if (PSG.EnvelopeA != 0) PSG.VolA = PSG.VolE;
if (PSG.EnvelopeB != 0) PSG.VolB = PSG.VolE;
if (PSG.EnvelopeC != 0) PSG.VolC = PSG.VolE;
}
}
buf1.write16(0, (ushort)((vola * PSG.VolA) / STEP));
buf2.write16(0, (ushort)((volb * PSG.VolB) / STEP));
buf3.write16(0, (ushort)((volc * PSG.VolC) / STEP));
buf1.offset += 2;
buf2.offset += 2;
buf3.offset += 2;
length--;
}
}