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GA20: yet another optimization

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This commit is contained in:
tildearrow 2025-02-20 04:44:19 -05:00
parent c6bb7acfad
commit cf89a4ff44
2 changed files with 14 additions and 6 deletions
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12
src/engine/platform/sound/ga20/iremga20.cpp
View file

@ -95,8 +95,6 @@ void iremga20_device::sound_stream_update(short** outputs, int len)
{ {
for (int j = 0; j < 4; j++) for (int j = 0; j < 4; j++)
{ {
s32 sampleout = 0;
channel_def &ch = m_channel[j]; channel_def &ch = m_channel[j];
if (ch.play) if (ch.play)
{ {
@ -104,17 +102,21 @@ void iremga20_device::sound_stream_update(short** outputs, int len)
ch.play = false; ch.play = false;
else else
{ {
sampleout = ch.mute ? 0 : (ch.sample - 0x80) * (s32)ch.volume; if (ch.hot) {
ch.hot=false;
ch.output = ch.mute ? 0 : (ch.sample - 0x80) * (s32)ch.volume;
}
ch.counter--; ch.counter--;
if (ch.counter <= ch.rate) if (ch.counter <= ch.rate)
{ {
ch.pos++; ch.pos++;
ch.counter = 0x100; ch.counter = 0x100;
ch.sample = m_intf.read_byte(ch.pos); ch.sample = m_intf.read_byte(ch.pos);
ch.hot=true;
} }
} }
} }
outputs[j][i] = sampleout; outputs[j][i] = ch.output;
} }
} }
} }
@ -141,6 +143,7 @@ void iremga20_device::write(u32 offset, u8 data)
case 5: case 5:
m_channel[ch].volume = (data * 256) / (data + 10); m_channel[ch].volume = (data * 256) / (data + 10);
m_channel[ch].hot=true;
break; break;
case 6: case 6:
@ -152,6 +155,7 @@ void iremga20_device::write(u32 offset, u8 data)
m_channel[ch].end = (m_regs[ch << 3 | 2] | m_regs[ch << 3 | 3] << 8) << 4; m_channel[ch].end = (m_regs[ch << 3 | 2] | m_regs[ch << 3 | 3] << 8) << 4;
m_channel[ch].counter = 0x100; m_channel[ch].counter = 0x100;
m_channel[ch].sample = m_intf.read_byte(m_channel[ch].pos); m_channel[ch].sample = m_intf.read_byte(m_channel[ch].pos);
m_channel[ch].hot=true;
} }
else else
m_channel[ch].play = false; m_channel[ch].play = false;

8
src/engine/platform/sound/ga20/iremga20.h
View file

@ -38,7 +38,7 @@ public:
void write(u32 offset, u8 data); void write(u32 offset, u8 data);
u8 read(u32 offset); u8 read(u32 offset);
inline void set_mute(const int ch, const bool mute) { m_channel[ch & 3].mute = mute; } inline void set_mute(const int ch, const bool mute) { m_channel[ch & 3].mute = mute; m_channel[ch & 3].hot = true; }
inline unsigned int get_position(const int ch) { inline unsigned int get_position(const int ch) {
return m_channel[ch&3].pos; return m_channel[ch&3].pos;
} }
@ -63,8 +63,10 @@ private:
counter(0), counter(0),
end(0), end(0),
volume(0), volume(0),
output(0),
play(0), play(0),
mute(false) mute(false),
hot(false)
{ {
} }
@ -74,8 +76,10 @@ private:
u32 counter; u32 counter;
u32 end; u32 end;
u32 volume; u32 volume;
int output;
bool play; bool play;
bool mute; bool mute;
bool hot;
}; };
u8 m_regs[0x20]; u8 m_regs[0x20];