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/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
*
* 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
*/
#ifndef SOUND_H
#define SOUND_H
#define BUFFER_SIZE (1 << 16)
#define BUFFER_SIZE_MASK (BUFFER_SIZE - 1)
#define GBA_SOUND_FREQUENCY (64 * 1024)
#define GBA_XTAL 16777216.0f
#define GBC_BASE_RATE GBA_XTAL
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 struct
{
s8 fifo[32];
u32 fifo_base;
u32 fifo_top;
fixed8_24 fifo_fractional;
// The + 1 is to give some extra room for linear interpolation
// when wrapping around.
u32 buffer_index;
direct_sound_status_type status;
direct_sound_volume_type volume;
u32 last_cpu_ticks;
} direct_sound_struct;
typedef enum
{
GBC_SOUND_INACTIVE,
GBC_SOUND_RIGHT,
GBC_SOUND_LEFT,
GBC_SOUND_LEFTRIGHT
} gbc_sound_status_type;
typedef struct
{
u32 rate;
fixed16_16 frequency_step;
fixed16_16 sample_index;
fixed16_16 tick_counter;
u32 total_volume;
u32 envelope_initial_volume;
u32 envelope_volume;
u32 envelope_direction;
u32 envelope_status;
u32 envelope_step;
u32 envelope_ticks;
u32 envelope_initial_ticks;
u32 sweep_status;
u32 sweep_direction;
u32 sweep_ticks;
u32 sweep_initial_ticks;
u32 sweep_shift;
u32 length_status;
u32 length_ticks;
u32 noise_type;
u32 wave_type;
u32 wave_bank;
u32 wave_volume;
gbc_sound_status_type status;
u32 active_flag;
u32 master_enable;
s8* sample_data;
} gbc_sound_struct;
extern direct_sound_struct direct_sound_channel[2];
extern gbc_sound_struct gbc_sound_channel[4];
extern s8 square_pattern_duty[4][8];
extern u32 gbc_sound_master_volume_left;
extern u32 gbc_sound_master_volume_right;
extern u32 gbc_sound_master_volume;
extern u32 gbc_sound_buffer_index;
extern u32 gbc_sound_last_cpu_ticks;
extern u32 sound_frequency;
extern u32 sound_on;
extern u32 global_enable_audio;
extern u32 enable_low_pass_filter;
void sound_timer_queue8(u32 channel, u8 value);
void sound_timer_queue16(u32 channel, u16 value);
void sound_timer_queue32(u32 channel, u32 value);
void sound_timer(fixed8_24 frequency_step, u32 channel);
void sound_reset_fifo(u32 channel);
void update_gbc_sound(u32 cpu_ticks);
void init_sound(int need_reset);
void sound_write_mem_savestate(file_tag_type savestate_file);
void sound_read_savestate(file_tag_type savestate_file);
void render_audio(void);
void reset_sound();
void sound_exit();
#endif
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