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opl3_drums.c
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1 /*
2  * Copyright (c) by Uros Bizjak <[email protected]>
3  *
4  * OPL2/OPL3/OPL4 FM routines for internal percussion channels
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  */
21 
22 #include "opl3_voice.h"
23 
24 extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];
25 
26 static char snd_opl3_drum_table[47] =
27 {
28  OPL3_BASSDRUM_ON, OPL3_BASSDRUM_ON, OPL3_HIHAT_ON, /* 35 - 37 */
29  OPL3_SNAREDRUM_ON, OPL3_HIHAT_ON, OPL3_SNAREDRUM_ON, /* 38 - 40 */
30  OPL3_BASSDRUM_ON, OPL3_HIHAT_ON, OPL3_BASSDRUM_ON, /* 41 - 43 */
31  OPL3_HIHAT_ON, OPL3_TOMTOM_ON, OPL3_HIHAT_ON, /* 44 - 46 */
32  OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_CYMBAL_ON, /* 47 - 49 */
33 
34  OPL3_TOMTOM_ON, OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, /* 50 - 52 */
35  OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, /* 53 - 55 */
36  OPL3_HIHAT_ON, OPL3_CYMBAL_ON, OPL3_TOMTOM_ON, /* 56 - 58 */
37  OPL3_CYMBAL_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 59 - 61 */
38  OPL3_HIHAT_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 62 - 64 */
39 
40  OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 65 - 67 */
41  OPL3_TOMTOM_ON, OPL3_HIHAT_ON, OPL3_HIHAT_ON, /* 68 - 70 */
42  OPL3_HIHAT_ON, OPL3_HIHAT_ON, OPL3_TOMTOM_ON, /* 71 - 73 */
43  OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 74 - 76 */
44  OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 77 - 79 */
45  OPL3_CYMBAL_ON, OPL3_CYMBAL_ON /* 80 - 81 */
46 };
47 
48 struct snd_opl3_drum_voice {
49  int voice;
50  int op;
51  unsigned char am_vib;
52  unsigned char ksl_level;
53  unsigned char attack_decay;
54  unsigned char sustain_release;
55  unsigned char feedback_connection;
56  unsigned char wave_select;
57 };
58 
59 struct snd_opl3_drum_note {
60  int voice;
61  unsigned char fnum;
62  unsigned char octave_f;
63  unsigned char feedback_connection;
64 };
65 
66 static struct snd_opl3_drum_voice bass_op0 = {6, 0, 0x00, 0x32, 0xf8, 0x66, 0x30, 0x00};
67 static struct snd_opl3_drum_voice bass_op1 = {6, 1, 0x00, 0x03, 0xf6, 0x57, 0x30, 0x00};
68 static struct snd_opl3_drum_note bass_note = {6, 0x90, 0x09};
69 
70 static struct snd_opl3_drum_voice hihat = {7, 0, 0x00, 0x03, 0xf0, 0x06, 0x20, 0x00};
71 
72 static struct snd_opl3_drum_voice snare = {7, 1, 0x00, 0x03, 0xf0, 0x07, 0x20, 0x02};
73 static struct snd_opl3_drum_note snare_note = {7, 0xf4, 0x0d};
74 
75 static struct snd_opl3_drum_voice tomtom = {8, 0, 0x02, 0x03, 0xf0, 0x06, 0x10, 0x00};
76 static struct snd_opl3_drum_note tomtom_note = {8, 0xf4, 0x09};
77 
78 static struct snd_opl3_drum_voice cymbal = {8, 1, 0x04, 0x03, 0xf0, 0x06, 0x10, 0x00};
79 
80 /*
81  * set drum voice characteristics
82  */
83 static void snd_opl3_drum_voice_set(struct snd_opl3 *opl3,
84  struct snd_opl3_drum_voice *data)
85 {
86  unsigned char op_offset = snd_opl3_regmap[data->voice][data->op];
87  unsigned char voice_offset = data->voice;
88  unsigned short opl3_reg;
89 
90  /* Set OPL3 AM_VIB register */
91  opl3_reg = OPL3_LEFT | (OPL3_REG_AM_VIB + op_offset);
92  opl3->command(opl3, opl3_reg, data->am_vib);
93 
94  /* Set OPL3 KSL_LEVEL register */
95  opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset);
96  opl3->command(opl3, opl3_reg, data->ksl_level);
97 
98  /* Set OPL3 ATTACK_DECAY register */
99  opl3_reg = OPL3_LEFT | (OPL3_REG_ATTACK_DECAY + op_offset);
100  opl3->command(opl3, opl3_reg, data->attack_decay);
101 
102  /* Set OPL3 SUSTAIN_RELEASE register */
103  opl3_reg = OPL3_LEFT | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
104  opl3->command(opl3, opl3_reg, data->sustain_release);
105 
106  /* Set OPL3 FEEDBACK_CONNECTION register */
107  opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
108  opl3->command(opl3, opl3_reg, data->feedback_connection);
109 
110  /* Select waveform */
111  opl3_reg = OPL3_LEFT | (OPL3_REG_WAVE_SELECT + op_offset);
112  opl3->command(opl3, opl3_reg, data->wave_select);
113 }
114 
115 /*
116  * Set drum voice pitch
117  */
118 static void snd_opl3_drum_note_set(struct snd_opl3 *opl3,
119  struct snd_opl3_drum_note *data)
120 {
121  unsigned char voice_offset = data->voice;
122  unsigned short opl3_reg;
123 
124  /* Set OPL3 FNUM_LOW register */
125  opl3_reg = OPL3_LEFT | (OPL3_REG_FNUM_LOW + voice_offset);
126  opl3->command(opl3, opl3_reg, data->fnum);
127 
128  /* Set OPL3 KEYON_BLOCK register */
129  opl3_reg = OPL3_LEFT | (OPL3_REG_KEYON_BLOCK + voice_offset);
130  opl3->command(opl3, opl3_reg, data->octave_f);
131 }
132 
133 /*
134  * Set drum voice volume and position
135  */
136 static void snd_opl3_drum_vol_set(struct snd_opl3 *opl3,
137  struct snd_opl3_drum_voice *data,
138  int vel, struct snd_midi_channel *chan)
139 {
140  unsigned char op_offset = snd_opl3_regmap[data->voice][data->op];
141  unsigned char voice_offset = data->voice;
142  unsigned char reg_val;
143  unsigned short opl3_reg;
144 
145  /* Set OPL3 KSL_LEVEL register */
146  reg_val = data->ksl_level;
147  snd_opl3_calc_volume(&reg_val, vel, chan);
148  opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset);
149  opl3->command(opl3, opl3_reg, reg_val);
150 
151  /* Set OPL3 FEEDBACK_CONNECTION register */
152  /* Set output voice connection */
153  reg_val = data->feedback_connection | OPL3_STEREO_BITS;
154  if (chan->gm_pan < 43)
155  reg_val &= ~OPL3_VOICE_TO_RIGHT;
156  if (chan->gm_pan > 85)
157  reg_val &= ~OPL3_VOICE_TO_LEFT;
158  opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
159  opl3->command(opl3, opl3_reg, reg_val);
160 }
161 
162 /*
163  * Loads drum voices at init time
164  */
165 void snd_opl3_load_drums(struct snd_opl3 *opl3)
166 {
167  snd_opl3_drum_voice_set(opl3, &bass_op0);
168  snd_opl3_drum_voice_set(opl3, &bass_op1);
169  snd_opl3_drum_note_set(opl3, &bass_note);
170 
171  snd_opl3_drum_voice_set(opl3, &hihat);
172 
173  snd_opl3_drum_voice_set(opl3, &snare);
174  snd_opl3_drum_note_set(opl3, &snare_note);
175 
176  snd_opl3_drum_voice_set(opl3, &tomtom);
177  snd_opl3_drum_note_set(opl3, &tomtom_note);
178 
179  snd_opl3_drum_voice_set(opl3, &cymbal);
180 }
181 
182 /*
183  * Switch drum voice on or off
184  */
185 void snd_opl3_drum_switch(struct snd_opl3 *opl3, int note, int vel, int on_off,
186  struct snd_midi_channel *chan)
187 {
188  unsigned char drum_mask;
189  struct snd_opl3_drum_voice *drum_voice;
190 
191  if (!(opl3->drum_reg & OPL3_PERCUSSION_ENABLE))
192  return;
193 
194  if ((note < 35) || (note > 81))
195  return;
196  drum_mask = snd_opl3_drum_table[note - 35];
197 
198  if (on_off) {
199  switch (drum_mask) {
200  case OPL3_BASSDRUM_ON:
201  drum_voice = &bass_op1;
202  break;
203  case OPL3_HIHAT_ON:
204  drum_voice = &hihat;
205  break;
206  case OPL3_SNAREDRUM_ON:
207  drum_voice = &snare;
208  break;
209  case OPL3_TOMTOM_ON:
210  drum_voice = &tomtom;
211  break;
212  case OPL3_CYMBAL_ON:
213  drum_voice = &cymbal;
214  break;
215  default:
216  drum_voice = &tomtom;
217  }
218 
219  snd_opl3_drum_vol_set(opl3, drum_voice, vel, chan);
220  opl3->drum_reg |= drum_mask;
221  } else {
222  opl3->drum_reg &= ~drum_mask;
223  }
224  opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
225  opl3->drum_reg);
226 }
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