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Fix some SMS audio inaccuracies (squashed PR #3602) 

* fix noise audio channel on SMS VDP

* Update SN76489sms.cs

also, white noise is generated by XORing bits 0 and 3, not 0 and 1, on an SMS/GG VDP

* Update SN76489sms.cs

reverting commit #7b857e7
This commit is contained in:
sverx 2023-04-27 06:46:52 +01:00 committed by GitHub
parent dd30a389a0
commit 102dee9622
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 12 deletions
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19
src/BizHawk.Emulation.Cores/Sound/SN76489sms.cs
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@ -24,8 +24,6 @@ namespace BizHawk.Emulation.Cores.Components
public int noise_rate;
public bool noise_bit;
public ushort tone_low;
public bool A_L, B_L, C_L, noise_L;
public bool A_R, B_R, C_R, noise_R;
@ -90,8 +88,6 @@ namespace BizHawk.Emulation.Cores.Components
ser.Sync(nameof(noise_clock), ref noise_clock);
ser.Sync(nameof(noise_bit), ref noise_bit);
ser.Sync(nameof(tone_low), ref tone_low);
ser.Sync(nameof(psg_clock), ref psg_clock);
ser.Sync(nameof(A_up), ref A_up);
@ -137,7 +133,8 @@ namespace BizHawk.Emulation.Cores.Components
{
if (chan_sel < 3)
{
tone_low = (ushort)(value & 0xF);
Chan_tone[chan_sel] &= 0x3F0;
Chan_tone[chan_sel] |= (ushort)(value & 0xF);
}
else
{
@ -159,7 +156,8 @@ namespace BizHawk.Emulation.Cores.Components
{
if (chan_sel < 3)
{
Chan_tone[chan_sel] = (ushort)(((value & 0x3F) << 4) | tone_low);
Chan_tone[chan_sel] &= 0xF;
Chan_tone[chan_sel] |= (ushort)((value & 0x3F) << 4);
}
else
{
@ -193,11 +191,11 @@ namespace BizHawk.Emulation.Cores.Components
noise_bit = noise.Bit(0);
if (noise_type)
{
noise = (((noise & 1) ^ ((noise >> 1) & 1)) << 14) | (noise >> 1);
noise = (((noise & 1) ^ ((noise >> 3) & 1)) << 15) | (noise >> 1);
}
else
{
noise = ((noise & 1) << 14) | (noise >> 1);
noise = ((noise & 1) << 15) | (noise >> 1);
}
if (noise_rate == 0)
@ -224,21 +222,18 @@ namespace BizHawk.Emulation.Cores.Components
{
A_up = !A_up;
clock_A = Chan_tone[0] + 1;
if (clock_A == 1) { A_up = !A_up; }
}
if (clock_B == 0)
{
B_up = !B_up;
clock_B = Chan_tone[1] + 1;
if (clock_B == 1) { B_up = !B_up; }
}
if (clock_C == 0)
{
C_up = !C_up;
clock_C = Chan_tone[2] + 1;
if (clock_C == 1) { C_up = !C_up; }
}
// now calculate the volume of each channel and add them together
@ -260,4 +255,4 @@ namespace BizHawk.Emulation.Cores.Components
}
}
}
}
}