private static void c352_ramp_volume(C352_Voice v, int ch, byte val)
{
short vol_delta = (short)(v.curr_vol[ch] - val);
if (vol_delta != 0)
{
v.curr_vol[ch] = (byte)(v.curr_vol[ch] + ((vol_delta > 0) ? -1 : 1));
}
//Console.WriteLine("v.curr_vol[ch{0}] = {1} val={2}", ch, v.curr_vol[ch], val);
}
private static void c352_ramp_volume(C352_Voice v, int ch, byte val)
{
if ((v.flags & (int)C352_FLG.FILTER) != 0)
{
v.curr_vol[ch] = val;
return;
}
short vol_delta = (short)(v.curr_vol[ch] - val);
if (vol_delta != 0)
{
v.curr_vol[ch] = (byte)(v.curr_vol[ch] + ((vol_delta > 0) ? -1 : 1));
}
//Console.WriteLine("v.curr_vol[ch{0}] = {1} val={2}", ch, v.curr_vol[ch], val);
}
private static void C352_fetch_sample(C352 c, C352_Voice v)
{
//Console.WriteLine("v->sample = {0} v->pos = {1} c->wave_mask = {2} v->flags ={3} ", v.sample, v.pos, c.wave_mask, v.flags);
v.last_sample = v.sample;
//if (v.flags & C352_FLG_NOISE)
if ((v.flags & 0x0010) != 0)
{
c.random = (ushort)((c.random >> 1) ^ ((-(c.random & 1)) & 0xfff6));
v.sample = (short)c.random;
}
else
{
sbyte s, s2;
ushort pos;
s = (sbyte)c.wave[v.pos & c.wave_mask];
v.sample = (short)(s << 8);
//if (v.flags & C352_FLG_MULAW)
if ((v.flags & 0x0008) != 0)
{
s2 = (sbyte)((s & 0x7f) >> 4);
v.sample = (short)(((s2 * s2) << 4) - (~(s2 << 1)) * (s & 0x0f));
v.sample = (short)(((s & 0x80) != 0) ? ((~v.sample) << 5) : (v.sample << 5));
}
pos = (ushort)(v.pos & 0xffff);
//if ((v.flags & C352_FLG_LOOP) && v.flags & C352_FLG_REVERSE)
if ((v.flags & 0x0002) != 0 && (v.flags & 0x0001) != 0)
{
// backwards>forwards
//if ((v.flags & C352_FLG_LDIR) && pos == v.wave_loop)
if ((v.flags & 0x0040) != 0 && pos == v.wave_loop)
{
//v.flags &= ~C352_FLG_LDIR;
v.flags &= 0xffbf;
}
// forwards>backwards
//else if (!(v.flags & C352_FLG_LDIR) && pos == v.wave_end)
else if ((v.flags & 0x0040) == 0 && pos == v.wave_end)
{
//v.flags |= C352_FLG_LDIR;
v.flags |= 0x0040;
}
//v.pos += (v.flags & C352_FLG_LDIR) ? -1 : 1;
v.pos = (uint)(v.pos + ((v.flags & 0x0040) != 0 ? -1 : 1));
}
else if (pos == v.wave_end)
{
//if ((v.flags & C352_FLG_LINK) && (v.flags & C352_FLG_LOOP))
if ((v.flags & 0x0020) != 0 && (v.flags & 0x0002) != 0)
{
v.pos = (uint)((v.wave_start << 16) | v.wave_loop);
//v.flags |= C352_FLG_LOOPHIST;
v.flags |= 0x0800;
}
//else if (v.flags & C352_FLG_LOOP)
else if ((v.flags & 0x0002) != 0)
{
v.pos = (v.pos & 0xff0000) | v.wave_loop;
//v.flags |= C352_FLG_LOOPHIST;
v.flags |= 0x0800;
}
else
{
//v.flags |= C352_FLG_KEYOFF;
v.flags |= 0x2000;
//v.flags &= ~C352_FLG_BUSY;
v.flags &= 0x7fff;
v.sample = 0;
}
}
else
{
//v.pos += (v.flags & C352_FLG_REVERSE) ? -1 : 1;
v.pos = (uint)(v.pos + ((v.flags & 0x0001) != 0 ? -1 : 1));
}
}
}