summaryrefslogtreecommitdiff
path: root/src/soundux.h
blob: 4b313df85f559c8aadff7cb4ae33ef888b4160d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
 * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 *
 * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
 *                           Jerremy Koot (jkoot@snes9x.com)
 *
 * Super FX C emulator code 
 * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
 *                           Gary Henderson.
 * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
 *
 * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
 * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
 * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
 *
 * DOS port code contains the works of other authors. See headers in
 * individual files.
 *
 * Snes9x homepage: http://www.snes9x.com
 *
 * Permission to use, copy, modify and distribute Snes9x in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Snes9x is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Snes9x or software derived from Snes9x.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so everyone can benefit from the modifications
 * in future versions.
 *
 * Super NES and Super Nintendo Entertainment System are trademarks of
 * Nintendo Co., Limited and its subsidiary companies.
 */
#ifndef _SOUND_H_
#define _SOUND_H_

enum { SOUND_SAMPLE = 0, SOUND_NOISE, SOUND_EXTRA_NOISE, SOUND_MUTE };
enum { SOUND_SILENT, SOUND_ATTACK, SOUND_DECAY, SOUND_SUSTAIN,
       SOUND_RELEASE, SOUND_GAIN, SOUND_INCREASE_LINEAR,
       SOUND_INCREASE_BENT_LINE, SOUND_DECREASE_LINEAR,
       SOUND_DECREASE_EXPONENTIAL};

enum { MODE_NONE = SOUND_SILENT, MODE_ADSR, MODE_RELEASE = SOUND_RELEASE,
       MODE_GAIN, MODE_INCREASE_LINEAR, MODE_INCREASE_BENT_LINE,
       MODE_DECREASE_LINEAR, MODE_DECREASE_EXPONENTIAL};

#define MAX_ENVELOPE_HEIGHT 127
#define ENVELOPE_SHIFT 7
#define MAX_VOLUME 127
#define VOLUME_SHIFT 7
#define VOL_DIV 128
#define SOUND_DECODE_LENGTH 16

#define NUM_CHANNELS    8
#define SOUND_BUFFER_SIZE (2*44100/50)
#define MAX_BUFFER_SIZE SOUND_BUFFER_SIZE

#define SOUND_BUFS      4

typedef struct {
    int playback_rate;
    bool8 stereo;
    bool8 mute_sound;
    uint8 sound_switch;
    int noise_gen;
	uint32 freqbase; // notaz
} SoundStatus;

EXTERN_C SoundStatus so;

typedef struct {
    int state;			// 0x00
    int type;			// 0x04
    short volume_left;		// 0x08
    short volume_right;		// 0x0A
    uint32 hertz;		// 0x0C
    uint32 frequency;		// 0x10
    uint32 count;		// 0x14
    bool32 loop;		// 0x18
    int envx;			// 0x1C
    short left_vol_level;	// 0x20	
    short right_vol_level;	// 0x22
    short envx_target;		// 0x24
    short padding;		// 0x26
    unsigned long int env_error;	// 0x28
    unsigned long erate;		// 0x2C
    int direction;			// 0x30
    unsigned long attack_rate;		// 0x34
    unsigned long decay_rate;		// 0x38
    unsigned long sustain_rate;		// 0x3C
    unsigned long release_rate;		// 0x40
    unsigned long sustain_level;	// 0x44
    signed short sample;		// 0x48
    signed short decoded [16];
    signed short previous16 [2];
    signed short *block;
    uint16 sample_number;
    bool8 last_block;
    bool8 needs_decode;
    uint32 block_pointer;
    uint32 sample_pointer;
    int *echo_buf_ptr;
    int mode;
    int32 envxx;
    signed short next_sample;
    int32 interpolate;
    int32 previous [2];
	// notaz
	uint8 env_ind_attack;
	uint8 env_ind_decay;
	uint8 env_ind_sustain;
	uint8 dummy1;
    // Just incase they are needed in the future, for snapshot compatibility.
    uint32 dummy [7];
	//I'll use Fatl's recovery on savestates.
	short gaussian[8];
	int   g_index;
	unsigned short last_valid_header;
	uint8 padding2[256-212];	// Last time I checked it, it was 212 bytes long
} Channel;

typedef struct
{
    short master_volume_left;  // 0x00
    short master_volume_right; // 0x02 
    short echo_volume_left;    // 0x04	
    short echo_volume_right;	// 0x06
    int echo_enable;		// 0x08
    int echo_feedback;		// 0x0C
    int echo_ptr;		// 0x10
    int echo_buffer_size;	// 0x14
    int echo_write_enabled;	// 0x18
    int echo_channel_enable;	// 0x1C
    int pitch_mod;		// 0x20
    // Just incase they are needed in the future, for snapshot compatibility.
    uint32 dummy [3];		// 0x24, 0x28, 0x2C
    Channel channels [NUM_CHANNELS];	// 0x30
    bool8 no_filter;
    int master_volume [2];
    int echo_volume [2];
    int noise_hertz;
} SSoundData;

EXTERN_C SSoundData SoundData;

void S9xSetEnvelopeHeight (int channel, int height);
void S9xSetSoundKeyOff (int channel);
void S9xSetSoundDecayMode (int channel);
void S9xSetSoundAttachMode (int channel);
void S9xSoundStartEnvelope (Channel *);
void S9xSetSoundSample (int channel, uint16 sample_number);
void S9xSetEchoDelay (int byte);
void S9xResetSound (bool8 full);
void S9xFixSoundAfterSnapshotLoad ();
void S9xPlaybackSoundSetting (int channel);
void S9xFixEnvelope (int channel, uint8 gain, uint8 adsr1, uint8 adsr2);
void S9xStartSample (int channel);

EXTERN_C void S9xMixSamples (signed short *buffer, int sample_count);
EXTERN_C void S9xMixSamplesO(signed short *buffer, int sample_count, int sample_offset);
void S9xSetPlaybackRate (uint32 rate);
bool8 S9xInitSound (void);
#endif



// notaz: some stuff from soundux.cpp to enable their inlining
#include "apu.h"
//#define DEBUG
//#include <dprintf.h>

extern int Echo [24000];
extern int Loop [16];
extern int FilterTaps [8];
extern int EchoBuffer [SOUND_BUFFER_SIZE];
extern int NoiseFreq [32];

// precalculated env rates for S9xSetEnvRate
extern unsigned long AttackERate     [16][10];
extern unsigned long DecayERate       [8][10];
extern unsigned long SustainERate    [32][10];
extern unsigned long IncreaseERate   [32][10];
extern unsigned long DecreaseERateExp[32][10];
extern unsigned long KeyOffERate[10];


#define FIXED_POINT 0x10000UL
#define CLIP8(v) \
if ((v) < -128) \
    (v) = -128; \
else \
if ((v) > 127) \
    (v) = 127

static inline void S9xSetSoundMute (bool8 mute)
{
    //bool8 old = so.mute_sound;
    so.mute_sound = mute;
    //return (old);
}

static inline void S9xSetEnvRate (Channel *ch, unsigned long rate, int direction, int target, unsigned int mode)
{
    ch->envx_target = target;

    if (rate == ~0UL)
    {
	ch->direction = 0;
	rate = 0;
    }
    else
	ch->direction = direction;


    if (rate == 0 || so.playback_rate == 0)
		ch->erate = 0;
    else
    {
		switch(mode >> 28) {
			case 0: // attack
			ch->erate = AttackERate[ch->env_ind_attack][ch->state];
			break;

			case 1: // Decay
			ch->erate = DecayERate[ch->env_ind_decay][ch->state];
			break;

			case 2: // Sustain
			ch->erate = SustainERate[ch->env_ind_sustain][ch->state];
			break;

			case 3: // Increase
			ch->erate = IncreaseERate[mode&0x1f][ch->state];
			break;

			case 4: // DecreaseExp
			ch->erate = DecreaseERateExp[mode&0x1f][ch->state];
			break;

			case 5: // KeyOff
			ch->erate = KeyOffERate[ch->state];
			break;
		}
	}

#if 0
    static int steps [] =
    {
//	0, 64, 1238, 1238, 256, 1, 64, 109, 64, 1238
	0, 64, 619, 619, 128, 1, 64, 55, 64, 619
    };

    if (rate == 0 || so.playback_rate == 0)
	ch->erate = 0;
    else
    {
	ch->erate = (unsigned long)
		    (((int64) FIXED_POINT * 1000 * steps [ch->state]) /
		      (rate * so.playback_rate));
    }
#endif
}

static inline void S9xSetEchoEnable (uint8 byte)
{
    SoundData.echo_channel_enable = byte;
    if (!SoundData.echo_write_enabled || Settings.DisableSoundEcho)
	byte = 0;
    if (byte && !SoundData.echo_enable)
    {
	memset (Echo, 0, sizeof (Echo));
	memset (Loop, 0, sizeof (Loop));
    }

    SoundData.echo_enable = byte;
    for (int i = 0; i < 8; i++)
    {
	if (byte & (1 << i))
	    SoundData.channels [i].echo_buf_ptr = EchoBuffer;
	else
	    SoundData.channels [i].echo_buf_ptr = 0;
    }
}

static inline void S9xSetEchoFeedback (int feedback)
{
    CLIP8(feedback);
    SoundData.echo_feedback = feedback;
}

static inline void S9xSetFilterCoefficient (int tap, int value)
{
    FilterTaps [tap & 7] = value;
    SoundData.no_filter = (FilterTaps [0] == 127 || FilterTaps [0] == 0) && 
			   FilterTaps [1] == 0   &&
			   FilterTaps [2] == 0   &&
			   FilterTaps [3] == 0   &&
			   FilterTaps [4] == 0   &&
			   FilterTaps [5] == 0   &&
			   FilterTaps [6] == 0   &&
			   FilterTaps [7] == 0;
}

static inline uint16 *S9xGetSampleAddress (int sample_number)
{
    uint32 addr = (((APU.DSP[APU_DIR] << 8) + (sample_number << 2)) & 0xffff);
    return (uint16 *)(IAPU.RAM + addr);
}

static inline void S9xSetSoundFrequency (int channel, int hertz) // hertz [0~64K<<1]
{
    if (so.playback_rate)
    {
		if (SoundData.channels[channel].type == SOUND_NOISE)
			hertz = NoiseFreq [APU.DSP [APU_FLG] & 0x1f];
#if 0 // notaz: this compiles to something awful
		SoundData.channels[channel].frequency = (int)
			(((int64) hertz * FIXED_POINT) / so.playback_rate);
#else
		SoundData.channels[channel].frequency = (hertz * so.freqbase) >> 11;
#endif

	/*	if (Settings.FixFrequency)
		{
			SoundData.channels[channel].frequency = 
			(unsigned long) ((double)  SoundData.channels[channel].frequency * 0.980);
		}*/
	}
}