diff options
Diffstat (limited to 'backends/midi')
| -rw-r--r-- | backends/midi/adlib.cpp | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/backends/midi/adlib.cpp b/backends/midi/adlib.cpp index 0c745dae6a..43ab7dec73 100644 --- a/backends/midi/adlib.cpp +++ b/backends/midi/adlib.cpp @@ -25,6 +25,8 @@ #include "common/engine.h" // for warning/error/debug #include "common/util.h" +static int tick; + class MidiDriver_ADLIB; struct AdlibVoice; @@ -156,7 +158,7 @@ struct Struct10 { byte active; int16 cur_val; int16 count; - uint16 param; + uint16 max_value; int16 start_value; byte loop; byte table_a[4]; @@ -237,7 +239,7 @@ const byte param_table_1[16] = { 21, 30, 31, 0 }; -const uint16 param_table_2[16] = { +const uint16 maxval_table[16] = { 0x2FF, 0x1F, 0x7, 0x3F, 0x0F, 0x0F, 0x0F, 0x3, 0x3F, 0x0F, 0x0F, 0x0F, @@ -1004,6 +1006,7 @@ void MidiDriver_ADLIB::generate_samples(int16 *data, int len) { _next_tick -= step; if (!_next_tick) { + tick++; if (_timer_proc) (*_timer_proc)(_timer_param); on_timer(); @@ -1210,7 +1213,7 @@ void MidiDriver_ADLIB::struct10_setup(Struct10 *s10) { s10->num_steps = s10->speed_lo_max = e; if (f != 2) { - c = s10->param; + c = s10->max_value; g = s10->start_value; t = s10->table_b[f]; d = lookup_volume(c, (t & 0x7F) - 31); @@ -1397,7 +1400,7 @@ void MidiDriver_ADLIB::adlib_setup_channel(int chan, AdlibInstrument *instr, byt port = channel_mappings[chan]; adlib_write(port + 0x20, instr->flags_1); - if (!_game_SmallHeader ||(instr->feedback & 1)) + if (!_game_SmallHeader) adlib_write(port + 0x40, (instr->oplvl_1 | 0x3F) - vol_1 ); else adlib_write(port + 0x40, instr->oplvl_1); @@ -1408,7 +1411,10 @@ void MidiDriver_ADLIB::adlib_setup_channel(int chan, AdlibInstrument *instr, byt port = channel_mappings_2[chan]; adlib_write(port + 0x20, instr->flags_2); - adlib_write(port + 0x40, (instr->oplvl_2 | 0x3F) - vol_2 ); + if (!_game_SmallHeader) + adlib_write(port + 0x40, (instr->oplvl_1 | 0x3F) - vol_1 ); + else + adlib_write(port + 0x40, instr->oplvl_2 ); adlib_write(port + 0x60, 0xff & (~instr->atdec_2)); adlib_write(port + 0x80, 0xff & (~instr->sustrel_2)); adlib_write(port + 0xE0, instr->waveform_2); @@ -1434,7 +1440,7 @@ void MidiDriver_ADLIB::mc_init_stuff (AdlibVoice *voice, Struct10 * s10, s10->loop = flags & 0x20; s11->flag0x10 = flags & 0x10; s11->param = param_table_1[flags & 0xF]; - s10->param = param_table_2[flags & 0xF]; + s10->max_value = maxval_table[flags & 0xF]; s10->unk3 = 31; if (s11->flag0x40) { s10->modwheel = part->_modwheel >> 2; |