115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/* gameplaySP
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*
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* Copyright (C) 2006 Exophase <exophase@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SOUND_H
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#define SOUND_H
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#define BUFFER_SIZE (1 << 16)
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#define BUFFER_SIZE_MASK (BUFFER_SIZE - 1)
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#define GBA_SOUND_FREQUENCY (64 * 1024)
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#ifdef OVERCLOCK_60FPS
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#define GBC_BASE_RATE ((float)(60 * 228 * (272+960)))
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#else
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#define GBC_BASE_RATE ((float)(16 * 1024 * 1024))
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#endif
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#define DIRECT_SOUND_INACTIVE 0
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#define DIRECT_SOUND_RIGHT 1
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#define DIRECT_SOUND_LEFT 2
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#define DIRECT_SOUND_LEFTRIGHT 3
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typedef struct
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{
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s8 fifo[32];
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u32 fifo_base;
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u32 fifo_top;
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fixed8_24 fifo_fractional;
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// The + 1 is to give some extra room for linear interpolation
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// when wrapping around.
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u32 buffer_index;
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u32 status;
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u32 volume_halve;
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} direct_sound_struct;
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#define GBC_SOUND_INACTIVE 0
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#define GBC_SOUND_RIGHT 1
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#define GBC_SOUND_LEFT 2
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#define GBC_SOUND_LEFTRIGHT 3
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typedef struct
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{
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u32 rate;
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fixed16_16 frequency_step;
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fixed16_16 sample_index;
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fixed16_16 tick_counter;
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u32 total_volume;
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u32 envelope_initial_volume;
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u32 envelope_volume;
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u32 envelope_direction;
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u32 envelope_status;
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u32 envelope_ticks;
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u32 envelope_initial_ticks;
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u32 sweep_status;
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u32 sweep_direction;
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u32 sweep_ticks;
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u32 sweep_initial_ticks;
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u32 sweep_shift;
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u32 length_status;
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u32 length_ticks;
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u32 noise_type;
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u32 wave_type;
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u32 wave_bank;
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u32 wave_volume;
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u32 status;
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u32 active_flag;
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u32 master_enable;
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u32 sample_table_idx;
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} gbc_sound_struct;
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const extern s8 square_pattern_duty[4][8];
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extern direct_sound_struct direct_sound_channel[2];
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extern gbc_sound_struct gbc_sound_channel[4];
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extern u32 gbc_sound_master_volume_left;
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extern u32 gbc_sound_master_volume_right;
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extern u32 gbc_sound_master_volume;
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extern u32 gbc_sound_buffer_index;
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extern u32 gbc_sound_last_cpu_ticks;
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extern const u32 sound_frequency;
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extern u32 sound_on;
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void sound_timer_queue32(u32 channel, u32 value);
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unsigned sound_timer(fixed8_24 frequency_step, u32 channel);
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void sound_reset_fifo(u32 channel);
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void render_gbc_sound();
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void init_sound();
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bool sound_check_savestate(const u8 *src);
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unsigned sound_write_savestate(u8 *dst);
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bool sound_read_savestate(const u8 *src);
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u32 sound_read_samples(s16 *out, u32 frames);
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void reset_sound(void);
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#endif
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