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some more tweaks

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svn-id: r10637
This commit is contained in:
Max Horn 2003-10-06 13:02:06 +00:00
parent ca13989959
commit 5a1bd7574a
1 changed files with 5 additions and 15 deletions
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20
backends/midi/ym2612.cpp
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@ -324,6 +324,7 @@ void Operator2612::nextTick(uint16 rate, const int *phasebuf, int *outbuf, int b
int32 target;
State next_state;
const int32 zero_level = ((int32)0x7f << 15);
const int phaseIncrement = (_multiple > 0) ? (_frequency * _multiple) : (_frequency / 2);
while (buflen) {
switch (_state) {
@ -355,19 +356,13 @@ void Operator2612::nextTick(uint16 rate, const int *phasebuf, int *outbuf, int b
if (next_state == _s_attacking) {
// Attack phase
++_tickCount;
if (_attackTime <= 0) {
int i = (int) (_tickCount * _attackTime);
if (i >= 1024) {
_currentLevel = 0;
_state = _s_decaying;
switching = true;
} else {
int i = (int) (_tickCount * _attackTime);
if (i >= 1024) {
_currentLevel = 0;
_state = _s_decaying;
switching = true;
} else {
_currentLevel = attackOut[i] << (31 - 8 - 16);
}
_currentLevel = (attackOut[i] << (31 - 8 - 16));
}
} else {
// Decay, Sustain and Release phases
@ -402,12 +397,7 @@ void Operator2612::nextTick(uint16 rate, const int *phasebuf, int *outbuf, int b
// Result varies from original code by max of 8.
output = ((output >> 4) * (powtbl[511-((level>>9)&511)] >> 3)) / 1024;
if (_multiple > 0)
// _phase += (_frequency * _multiple) / rate;
_phase += _frequency * _multiple; // / rate; already included
else
// _phase += _frequency / (rate << 1);
_phase += _frequency / 2;
_phase += phaseIncrement;
}
_lastOutput = output;