thirdparty/scummvm
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Reverted to "old" YM3812 (FMOPL) emulator code.

Browse source 
Until specific information regarding the benefits
of migrating to the new emulator can be made
available, the "old" code will remain in effect
for the benefit of slower hardware platforms such
as some WinCE-based devices.

svn-id: r8903
This commit is contained in:
Jamieson Christian 2003-07-11 07:14:21 +00:00
parent 39b37df37a
commit 8b8b964aad
7 changed files with 996 additions and 2279 deletions
Download patch file Download diff file Expand all files Collapse all files

19
backends/midi/adlib.cpp
View file

@ -577,6 +577,7 @@ private:
bool _isOpen;
bool _game_SmallHeader;
FM_OPL *_opl;
byte *_adlib_reg_cache;
SoundMixer *_mixer;
@ -848,8 +849,12 @@ int MidiDriver_ADLIB::open() {
_adlib_reg_cache = (byte *)calloc(256, 1);
// We need to emulate one YM3812 chip
if (0 != YM3812Init(1, 3579545, g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0)))
error("Error initialising YM3812 sound chip emulation");
// if (0 != YM3812Init(1, 3579545, g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0)))
// error("Error initialising YM3812 sound chip emulation");
int env_bits = g_system->property(OSystem::PROP_GET_FMOPL_ENV_BITS, NULL);
int eg_ent = g_system->property(OSystem::PROP_GET_FMOPL_EG_ENT, NULL);
OPLBuildTables((env_bits ? env_bits : FMOPL_ENV_BITS_HQ), (eg_ent ? eg_ent : FMOPL_EG_ENT_HQ));
_opl = OPLCreate(OPL_TYPE_YM3812, 3579545, g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0));
adlib_write(1, 0x20);
adlib_write(8, 0x40);
@ -876,7 +881,7 @@ void MidiDriver_ADLIB::close() {
_mixer->setupPremix (0, 0);
// Turn off the OPL emulation
YM3812Shutdown();
// YM3812Shutdown();
free(_adlib_reg_cache);
@ -986,8 +991,9 @@ void MidiDriver_ADLIB::adlib_write(byte port, byte value) {
return;
_adlib_reg_cache[port] = value;
YM3812Write(0, 0, port);
YM3812Write(0, 1, value);
// YM3812Write(0, 0, port);
// YM3812Write(0, 1, value);
OPLWriteReg (_opl, port, value);
}
void MidiDriver_ADLIB::generate_samples(int16 *data, int len) {
@ -997,7 +1003,8 @@ void MidiDriver_ADLIB::generate_samples(int16 *data, int len) {
step = len;
if (step > _next_tick)
step = _next_tick;
YM3812UpdateOne(0, data, step);
// YM3812UpdateOne(0, data, step);
YM3812UpdateOne (_opl, data, step);
_next_tick -= step;
if (!_next_tick) {