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|
/* unofficial gameplaySP kai
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
* Copyright (C) 2007 takka <takka@tfact.net>
* Copyright (C) 2007 ????? <?????>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/******************************************************************************
* sound.h
* サウンド周りの処理
******************************************************************************/
#ifndef SOUND_H
#define SOUND_H
/******************************************************************************
* マクロ等の定義
******************************************************************************/
typedef enum
{
DIRECT_SOUND_INACTIVE,
DIRECT_SOUND_RIGHT,
DIRECT_SOUND_LEFT,
DIRECT_SOUND_LEFTRIGHT
} DIRECT_SOUND_STATUS_TYPE;
typedef enum
{
DIRECT_SOUND_VOLUME_50,
DIRECT_SOUND_VOLUME_100
} DIRECT_SOUND_VOLUME_TYPE;
typedef enum
{
GBC_SOUND_INACTIVE,
GBC_SOUND_RIGHT,
GBC_SOUND_LEFT,
GBC_SOUND_LEFTRIGHT
} GBC_SOUND_STATUS_TYPE;
typedef struct
{
int8_t fifo[32];
uint32_t fifo_base;
uint32_t fifo_top;
FIXED16_16 fifo_fractional;
// The + 1 is to give some extra room for linear interpolation
// when wrapping around.
uint32_t buffer_index;
DIRECT_SOUND_STATUS_TYPE status;
DIRECT_SOUND_VOLUME_TYPE volume;
uint32_t last_cpu_ticks;
} DIRECT_SOUND_STRUCT;
typedef struct
{
uint32_t rate;
FIXED16_16 frequency_step;
FIXED16_16 sample_index;
FIXED16_16 tick_counter;
uint32_t total_volume;
uint32_t envelope_initial_volume;
uint32_t envelope_volume;
uint32_t envelope_direction;
uint32_t envelope_status;
uint32_t envelope_step;
uint32_t envelope_ticks;
uint32_t envelope_initial_ticks;
uint32_t sweep_status;
uint32_t sweep_direction;
uint32_t sweep_ticks;
uint32_t sweep_initial_ticks;
uint32_t sweep_shift;
uint32_t length_status;
uint32_t length_ticks;
uint32_t noise_type;
uint32_t wave_type;
uint32_t wave_bank;
uint32_t wave_volume;
GBC_SOUND_STATUS_TYPE status;
uint32_t active_flag;
uint32_t master_enable;
int8_t *sample_data;
} GBC_SOUND_STRUCT;
#define BUFFER_SIZE (0x10000)
#define BUFFER_SIZE_MASK (0xffff) // バッファのバイト数。変更しないこと
// This is the frequency of sound output by the GBA. It is stored in a
// ring buffer containing BUFFER_SIZE bytes.
// The value should technically be 32768, but at least the GBA Video ROMs and
// Golden Sun - The Lost Age require this to be 2 times that, and
// the Pokémon GBA games require it to be a multiple or divisor of 22050 Hz.
#define SOUND_FREQUENCY (88200.0f)
#define GBC_SOUND_TONE_CONTROL_LOW(channel, address) \
{ \
uint32_t initial_volume = (value >> 12) & 0x0F; \
uint32_t envelope_ticks = ((value >> 8) & 0x07) * 4; \
gbc_sound_channel[channel].length_ticks = 64 - (value & 0x3F); \
gbc_sound_channel[channel].sample_data = \
square_pattern_duty[(value >> 6) & 0x03]; \
gbc_sound_channel[channel].envelope_direction = (value >> 11) & 0x01; \
gbc_sound_channel[channel].envelope_initial_volume = initial_volume; \
gbc_sound_channel[channel].envelope_volume = initial_volume; \
gbc_sound_channel[channel].envelope_initial_ticks = envelope_ticks; \
gbc_sound_channel[channel].envelope_ticks = envelope_ticks; \
gbc_sound_channel[channel].envelope_status = (envelope_ticks != 0); \
gbc_sound_channel[channel].envelope_volume = initial_volume; \
gbc_sound_update = 1; \
ADDRESS16(io_registers, address) = value; \
} \
#define GBC_SOUND_TONE_CONTROL_HIGH(channel, address) \
{ \
uint32_t rate = value & 0x7FF; \
gbc_sound_channel[channel].rate = rate; \
gbc_sound_channel[channel].frequency_step = FLOAT_TO_FP16_16((1048576.0f / SOUND_FREQUENCY) / (2048 - rate)); \
gbc_sound_channel[channel].length_status = (value >> 14) & 0x01; \
if(value & 0x8000) \
{ \
gbc_sound_channel[channel].active_flag = 1; \
gbc_sound_channel[channel].sample_index -= FLOAT_TO_FP16_16(1.0f / 12.0f); \
gbc_sound_channel[channel].envelope_ticks = \
gbc_sound_channel[channel].envelope_initial_ticks; \
gbc_sound_channel[channel].envelope_volume = \
gbc_sound_channel[channel].envelope_initial_volume; \
/*gbc_sound_channel[channel].sweep_ticks = \
gbc_sound_channel[channel].sweep_initial_ticks;*/ \
} \
\
gbc_sound_update = 1; \
ADDRESS16(io_registers, address) = value; \
} \
#define GBC_SOUND_TONE_CONTROL_SWEEP() \
{ \
uint32_t sweep_ticks = ((value >> 4) & 0x07) * 2; \
gbc_sound_channel[0].sweep_shift = value & 0x07; \
gbc_sound_channel[0].sweep_direction = (value >> 3) & 0x01; \
gbc_sound_channel[0].sweep_status = (value != 8); \
gbc_sound_channel[0].sweep_ticks = sweep_ticks; \
gbc_sound_channel[0].sweep_initial_ticks = sweep_ticks; \
gbc_sound_update = 1; \
ADDRESS16(io_registers, 0x60) = value; \
} \
#define GBC_SOUND_WAVE_CONTROL() \
{ \
gbc_sound_channel[2].wave_type = (value >> 5) & 0x01; \
gbc_sound_channel[2].wave_bank = (value >> 6) & 0x01; \
if(value & 0x80) \
{ \
gbc_sound_channel[2].master_enable = 1; \
} \
else \
{ \
gbc_sound_channel[2].master_enable = 0; \
} \
\
gbc_sound_update = 1; \
ADDRESS16(io_registers, 0x70) = value; \
} \
#define GBC_SOUND_TONE_CONTROL_LOW_WAVE() \
{ \
gbc_sound_channel[2].length_ticks = 256 - (value & 0xFF); \
if((value >> 15) & 0x01) \
{ \
gbc_sound_channel[2].wave_volume = 12288; \
} \
else \
{ \
gbc_sound_channel[2].wave_volume = \
gbc_sound_wave_volume[(value >> 13) & 0x03]; \
} \
gbc_sound_update = 1; \
ADDRESS16(io_registers, 0x72) = value; \
} \
#define GBC_SOUND_TONE_CONTROL_HIGH_WAVE() \
{ \
uint32_t rate = value & 0x7FF; \
gbc_sound_channel[2].rate = rate; \
gbc_sound_channel[2].frequency_step = FLOAT_TO_FP16_16((2097152.0f / SOUND_FREQUENCY) / (2048 - rate)); \
gbc_sound_channel[2].length_status = (value >> 14) & 0x01; \
if(value & 0x8000) \
{ \
gbc_sound_channel[2].sample_index = 0; \
gbc_sound_channel[2].active_flag = 1; \
} \
gbc_sound_update = 1; \
ADDRESS16(io_registers, 0x74) = value; \
} \
#define GBC_SOUND_NOISE_CONTROL() \
{ \
uint32_t dividing_ratio = value & 0x07; \
uint32_t frequency_shift = (value >> 4) & 0x0F; \
if(dividing_ratio == 0) \
{ \
gbc_sound_channel[3].frequency_step = \
FLOAT_TO_FP16_16((1048576.0f / SOUND_FREQUENCY) / \
(2 << frequency_shift)); \
} \
else \
{ \
gbc_sound_channel[3].frequency_step = \
FLOAT_TO_FP16_16((524288.0f / SOUND_FREQUENCY) / (dividing_ratio * \
(2 << frequency_shift))); \
} \
gbc_sound_channel[3].noise_type = (value >> 3) & 0x01; \
gbc_sound_channel[3].length_status = (value >> 14) & 0x01; \
if(value & 0x8000) \
{ \
gbc_sound_channel[3].sample_index = 0; \
gbc_sound_channel[3].active_flag = 1; \
gbc_sound_channel[3].envelope_ticks = \
gbc_sound_channel[3].envelope_initial_ticks; \
gbc_sound_channel[3].envelope_volume = \
gbc_sound_channel[3].envelope_initial_volume; \
} \
gbc_sound_update = 1; \
ADDRESS16(io_registers, 0x7C) = value; \
} \
#define GBC_TRIGGER_SOUND_CHANNEL(channel) \
gbc_sound_channel[channel].status = \
((value >> (channel + 11)) & 0x02) | ((value >> (channel + 8)) & 0x01) \
#define GBC_TRIGGER_SOUND() \
{ \
gbc_sound_master_volume_right = value & 0x07; \
gbc_sound_master_volume_left = (value >> 4) & 0x07; \
\
GBC_TRIGGER_SOUND_CHANNEL(0); \
GBC_TRIGGER_SOUND_CHANNEL(1); \
GBC_TRIGGER_SOUND_CHANNEL(2); \
GBC_TRIGGER_SOUND_CHANNEL(3); \
ADDRESS16(io_registers, 0x80) = value; \
} \
#define TRIGGER_SOUND() \
{ \
timer[0].direct_sound_channels = \
((~value >> 13) & 0x02) | ((~value >> 10) & 0x01); \
timer[1].direct_sound_channels = \
((value >> 13) & 0x02) | ((value >> 10) & 0x01); \
\
direct_sound_channel[0].volume = (value >> 2) & 0x01; \
direct_sound_channel[0].status = (value >> 8) & 0x03; \
direct_sound_channel[1].volume = (value >> 3) & 0x01; \
direct_sound_channel[1].status = (value >> 12) & 0x03; \
gbc_sound_master_volume = value & 0x03; \
\
if((value >> 11) & 0x01) \
sound_reset_fifo(0); \
if((value >> 15) & 0x01) \
sound_reset_fifo(1); \
ADDRESS16(io_registers, 0x82) = value; \
} \
#define SOUND_ON() \
if(value & 0x80) \
sound_on = 1; \
else \
{ \
uint32_t i; \
for(i = 0; i < 4; i++) \
{ \
gbc_sound_channel[i].active_flag = 0; \
} \
sound_on = 0; \
} \
ADDRESS16(io_registers, 0x84) = \
(ADDRESS16(io_registers, 0x84) & 0x000F) | (value & 0xFFF0); \
// タイマーの値の調整
// TODO:調整必要
#define ADJUST_SOUND_BUFFER(timer_number, channel) \
if(timer[timer_number].direct_sound_channels & (0x01 << (channel))) \
{ \
direct_sound_channel[channel].buffer_index = gbc_sound_buffer_index; \
} \
#define SOUND_UPDATE_FREQUENCY_STEP(timer_number) \
timer[timer_number].frequency_step = \
FLOAT_TO_FP16_16((SYS_CLOCK / SOUND_FREQUENCY) / timer_reload) \
/******************************************************************************
* グローバル変数の宣言
******************************************************************************/
extern DIRECT_SOUND_STRUCT direct_sound_channel[2];
extern GBC_SOUND_STRUCT gbc_sound_channel[4];
extern int8_t square_pattern_duty[4][8];
extern uint32_t gbc_sound_master_volume_left;
extern uint32_t gbc_sound_master_volume_right;
extern uint32_t gbc_sound_master_volume;
extern uint32_t sound_on;
extern uint32_t gbc_sound_wave_volume[4];
extern uint32_t gbc_sound_buffer_index;
extern uint32_t gbc_sound_partial_ticks;
void sound_timer_queue32(uint8_t channel);
void sound_timer(FIXED16_16 frequency_step, uint32_t channel);
void sound_reset_fifo(uint32_t channel);
void update_gbc_sound(uint32_t cpu_ticks);
void init_sound();
void sound_read_mem_savestate();
void sound_write_mem_savestate();
void reset_sound();
// Services provided to ports
/*
* Returns the number of samples available in the core's audio buffer.
* This number of samples is always interpreted with a sample rate of
* SOUND_FREQUENCY Hz, which is used by the core to render to its buffer.
*
* Returns:
* The number of samples available for reading by ReGBA_LoadNextAudioSample
* at the time of the function call, counting 1 for each two stereo samples
* available; that is, the number of times ReGBA_LoadNextAudioSample can be
* called with Left and Right without it returning zero.
*/
uint32_t ReGBA_GetAudioSamplesAvailable(void);
/*
* Loads and consumes the next audio sample from the core's audio buffer.
* The sample rate is SOUND_FREQUENCY Hz.
* Output:
* Left: A pointer to a signed 16-bit variable updated with the value for
* the next sample's left stereo channel.
* Right: A pointer to a signed 16-bit variable updated with the value for
* the next sample's right stereo channel.
* Returns:
* Non-zero if a sample was available; zero if no samples were available.
* Output assertions:
* If non-zero is returned, the loaded sample is consumed in the core's
* audio buffer.
* If zero is returned, neither variable is written to.
*/
uint32_t ReGBA_LoadNextAudioSample(int16_t* Left, int16_t* Right);
/*
* Discards the requested number of samples from the core's audio buffer.
* The sample rate is SOUND_FREQUENCY Hz.
* Input:
* Count: The number of samples to be discarded by the core.
* Returns:
* The number of samples that were actually discarded, which may be Count
* or fewer.
*/
uint32_t ReGBA_DiscardAudioSamples(uint32_t Count);
#endif /* SOUND_H */
|
