ref: a43e60ee11f11fa8140b7b22da70f06b598fc49d
parent: c887c9804b07ffc2d56fc4ab31ed1aa1486fd5c4
author: Simon Howard <fraggle@gmail.com>
date: Mon Aug 31 13:32:22 EDT 2009
Make channel volume work. Subversion-branch: /branches/opl-branch Subversion-revision: 1650
--- a/src/i_oplmusic.c
+++ b/src/i_oplmusic.c
@@ -133,6 +133,12 @@
// The frequency value being used.
unsigned int freq;
+ // The volume of the note being played on this channel.
+ unsigned int note_volume;
+
+ // The current volume that has been set for this channel.
+ unsigned int volume;
+
// Next in freelist
opl_voice_t *next;
};
@@ -163,22 +169,22 @@
// Mapping from MIDI volume level to OPL level value.
static const unsigned int volume_mapping_table[] = {- 0x3f, 0x3f, 0x3e, 0x3d, 0x3c, 0x3b, 0x3a, 0x3a,
- 0x39, 0x38, 0x37, 0x37, 0x36, 0x35, 0x34, 0x34,
- 0x33, 0x32, 0x32, 0x31, 0x30, 0x2f, 0x2f, 0x2e,
- 0x2d, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, 0x28, 0x27,
- 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x22, 0x21,
- 0x20, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1c,
- 0x1b, 0x1b, 0x1a, 0x1a, 0x19, 0x18, 0x18, 0x17,
- 0x17, 0x16, 0x16, 0x16, 0x16, 0x15, 0x15, 0x14,
- 0x14, 0x13, 0x13, 0x12, 0x12, 0x12, 0x11, 0x11,
- 0x10, 0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e,
- 0x0e, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c, 0x0b,
- 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09,
- 0x08, 0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07,
- 0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x04,
- 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+ 0, 1, 3, 5, 6, 8, 10, 11,
+ 13, 14, 16, 17, 19, 20, 22, 23,
+ 25, 26, 27, 29, 30, 32, 33, 34,
+ 36, 37, 39, 41, 43, 45, 47, 49,
+ 50, 52, 54, 55, 57, 59, 60, 61,
+ 63, 64, 66, 67, 68, 69, 71, 72,
+ 73, 74, 75, 76, 77, 79, 80, 81,
+ 82, 83, 84, 84, 85, 86, 87, 88,
+ 89, 90, 91, 92, 92, 93, 94, 95,
+ 96, 96, 97, 98, 99, 99, 100, 101,
+ 101, 102, 103, 103, 104, 105, 105, 106,
+ 107, 107, 108, 109, 109, 110, 110, 111,
+ 112, 112, 113, 113, 114, 114, 115, 115,
+ 116, 117, 117, 118, 118, 119, 119, 120,
+ 120, 121, 121, 122, 122, 123, 123, 123,
+ 124, 124, 125, 125, 126, 126, 127, 127
};
static boolean music_initialised = false;
@@ -433,8 +439,13 @@
// Set the instrument for a particular voice.
-static void SetVoiceInstrument(opl_voice_t *voice, genmidi_voice_t *data)
+static void SetVoiceInstrument(opl_voice_t *voice, genmidi_instr_t *instr)
{+ genmidi_voice_t *data;
+
+ voice->current_instr = instr;
+ data = &instr->opl2_voice;
+
// Doom loads the second operator first, then the first.
LoadOperatorData(voice->op2, &data->carrier, true);
@@ -446,8 +457,44 @@
WriteRegister(OPL_REGS_FEEDBACK + voice->index,
data->feedback | 0x30);
+
+ // Hack to force a volume update.
+
+ voice->volume = 999;
}
+static void SetVoiceVolume(opl_voice_t *voice, unsigned int volume)
+{+ unsigned int full_volume;
+ unsigned int instr_volume;
+ unsigned int reg_volume;
+
+ voice->note_volume = volume;
+
+ // Multiply note volume and channel volume to get the actual volume.
+
+ full_volume = (voice->note_volume * voice->channel->volume) / 127;
+
+ // The volume of each instrument can be controlled via GENMIDI:
+
+ instr_volume = 0x3f - voice->current_instr->opl2_voice.carrier.level;
+
+ // The volume value to use in the register:
+
+ reg_volume = ((instr_volume * volume_mapping_table[full_volume]) / 128);
+ reg_volume = (0x3f - reg_volume)
+ | voice->current_instr->opl2_voice.carrier.scale;
+
+ // Update the register, if necessary:
+
+ if (voice->volume != reg_volume)
+ {+ voice->volume = reg_volume;
+
+ WriteRegister(OPL_REGS_LEVEL + voice->op2, reg_volume);
+ }
+}
+
// Initialise the voice table and freelist
static void InitVoices(void)
@@ -698,6 +745,7 @@
if (voice == NULL)
{+ printf("\tno free voice\n");return;
}
@@ -706,12 +754,11 @@
// Program the voice with the instrument data:
- SetVoiceInstrument(voice, &instrument->opl2_voice);
+ SetVoiceInstrument(voice, instrument);
- // TODO: Set the volume level.
+ // Set the volume level.
- WriteRegister(OPL_REGS_LEVEL + voice->op2,
- volume_mapping_table[volume]);
+ SetVoiceVolume(voice, volume);
// Fixed pitch?
@@ -743,6 +790,23 @@
// channel, and change the instrument.
}
+static void SetChannelVolume(opl_channel_data_t *channel, unsigned int volume)
+{+ unsigned int i;
+
+ channel->volume = volume;
+
+ // Update all voices that this channel is using.
+
+ for (i=0; i<OPL_NUM_VOICES; ++i)
+ {+ if (voices[i].channel == channel)
+ {+ SetVoiceVolume(&voices[i], voices[i].note_volume);
+ }
+ }
+}
+
static void ControllerEvent(opl_track_data_t *track, midi_event_t *event)
{unsigned int controller;
@@ -761,7 +825,7 @@
switch (controller)
{case MIDI_CONTROLLER_MAIN_VOLUME:
- channel->volume = param;
+ SetChannelVolume(channel, param);
break;
case MIDI_CONTROLLER_PAN: