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I believe that the purpose of updateCallback45() is to add a signed value to a

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channel's unsigned tempo. Rewrote the function to make this clearer, and
renamed it update_changeChannelTempo().

svn-id: r21448
This commit is contained in:
Torbjörn Andersson 2006-03-25 10:11:38 +00:00
parent 2c279848d8
commit 737c52590b
1 changed files with 11 additions and 14 deletions
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25
engines/kyra/sound_adlib.cpp
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@ -275,7 +275,7 @@ private:
int update_resetToGlobalTempo(uint8 *&dataptr, Channel &channel, uint8 value);
int update_nop1(uint8 *&dataptr, Channel &channel, uint8 value);
int update_setDurationRandomness(uint8 *&dataptr, Channel &channel, uint8 value);
int updateCallback45(uint8 *&dataptr, Channel &channel, uint8 value);
int update_changeChannelTempo(uint8 *&dataptr, Channel &channel, uint8 value);
int updateCallback46(uint8 *&dataptr, Channel &channel, uint8 value);
int update_nop2(uint8 *&dataptr, Channel &channel, uint8 value);
int update_setupRhythmSection(uint8 *&dataptr, Channel &channel, uint8 value);
@ -1560,18 +1560,15 @@ int AdlibDriver::update_setDurationRandomness(uint8 *&dataptr, Channel &channel,
return 0;
}
int AdlibDriver::updateCallback45(uint8 *&dataptr, Channel &channel, uint8 value) {
if (value & 0x80) {
value += channel.tempo;
if (value >= channel.tempo)
value = 1;
} else {
uint8 temp = value;
value += channel.tempo;
if (value < temp)
value = 0xFF;
}
channel.tempo = value;
int AdlibDriver::update_changeChannelTempo(uint8 *&dataptr, Channel &channel, uint8 value) {
int tempo = channel.tempo + (int8)value;
if (tempo <= 0)
tempo = 1;
else if (tempo > 255)
tempo = 255;
channel.tempo = tempo;
return 0;
}
@ -1922,7 +1919,7 @@ const AdlibDriver::ParserOpcode AdlibDriver::_parserOpcodeTable[] = {
// 60
COMMAND(update_setDurationRandomness),
COMMAND(updateCallback45),
COMMAND(update_changeChannelTempo),
COMMAND(update_stopChannel),
COMMAND(updateCallback46),