2f1c528a6c
this also changes how direct sound channels are started and sample step precision is increased to hopefully fix gbc + direct channel desync that has been reported on the forums.
193 lines
7.5 KiB
C
193 lines
7.5 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 MAIN_H
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#define MAIN_H
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typedef enum
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{
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TIMER_INACTIVE,
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TIMER_PRESCALE,
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TIMER_CASCADE
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} timer_status_type;
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typedef enum
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{
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TIMER_NO_IRQ,
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TIMER_TRIGGER_IRQ
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} timer_irq_type;
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typedef enum
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{
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TIMER_DS_CHANNEL_NONE,
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TIMER_DS_CHANNEL_A,
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TIMER_DS_CHANNEL_B,
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TIMER_DS_CHANNEL_BOTH
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} timer_ds_channel_type;
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typedef struct
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{
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s32 count;
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u32 reload;
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u32 prescale;
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u32 stop_cpu_ticks;
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fixed8_24 frequency_step;
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timer_ds_channel_type direct_sound_channels;
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timer_irq_type irq;
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timer_status_type status;
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} timer_type;
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typedef enum
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{
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auto_frameskip,
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manual_frameskip,
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no_frameskip
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} frameskip_type;
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extern u32 cpu_ticks;
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extern u32 frame_ticks;
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extern u32 execute_cycles;
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extern frameskip_type current_frameskip_type;
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extern u32 frameskip_value;
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extern u32 random_skip;
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extern u32 global_cycles_per_instruction;
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extern u32 synchronize_flag;
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extern u32 skip_next_frame;
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extern u32 cycle_memory_access;
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extern u32 cycle_pc_relative_access;
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extern u32 cycle_sp_relative_access;
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extern u32 cycle_block_memory_access;
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extern u32 cycle_block_memory_sp_access;
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extern u32 cycle_block_memory_words;
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extern u32 cycle_dma16_words;
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extern u32 cycle_dma32_words;
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extern u32 flush_ram_count;
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extern u64 base_timestamp;
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extern char main_path[512];
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extern u32 update_backup_flag;
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extern u32 clock_speed;
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u32 update_gba();
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void reset_gba();
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void synchronize();
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void quit();
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void delay_us(u32 us_count);
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void get_ticks_us(u64 *tick_return);
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void game_name_ext(char *src, char *buffer, char *extension);
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void main_write_mem_savestate(file_tag_type savestate_file);
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void main_read_savestate(file_tag_type savestate_file);
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#ifdef PSP_BUILD
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u32 file_length(char *filename, s32 dummy);
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#else
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u32 file_length(char *dummy, FILE *fp);
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#endif
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extern u32 real_frame_count;
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extern u32 virtual_frame_count;
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extern u32 max_frameskip;
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extern u32 num_skipped_frames;
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#ifdef IN_MEMORY_C
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extern timer_type timer[4];
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static u32 prescale_table[] = { 0, 6, 8, 10 };
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#define count_timer(timer_number) \
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timer[timer_number].reload = 0x10000 - value; \
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if(timer_number < 2) \
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{ \
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u32 timer_reload = \
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timer[timer_number].reload << timer[timer_number].prescale; \
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sound_update_frequency_step(timer_number); \
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} \
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#define adjust_sound_buffer(timer_number, channel) \
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if(timer[timer_number].direct_sound_channels & (0x01 << channel)) \
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{ \
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direct_sound_channel[channel].buffer_index = \
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(gbc_sound_buffer_index + buffer_adjust) % BUFFER_SIZE; \
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} \
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#define trigger_timer(timer_number) \
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if(value & 0x80) \
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{ \
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if(timer[timer_number].status == TIMER_INACTIVE) \
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{ \
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u32 prescale = prescale_table[value & 0x03]; \
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u32 timer_reload = timer[timer_number].reload; \
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\
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if((value >> 2) & 0x01) \
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timer[timer_number].status = TIMER_CASCADE; \
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else \
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timer[timer_number].status = TIMER_PRESCALE; \
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\
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timer[timer_number].prescale = prescale; \
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timer[timer_number].irq = (value >> 6) & 0x01; \
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\
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address16(io_registers, 0x100 + (timer_number * 4)) = \
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-timer_reload; \
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\
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timer_reload <<= prescale; \
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timer[timer_number].count = timer_reload; \
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\
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if(timer_reload < execute_cycles) \
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execute_cycles = timer_reload; \
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\
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if(timer_number < 2) \
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{ \
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u32 buffer_adjust = \
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(u32)(((float)(cpu_ticks - gbc_sound_last_cpu_ticks) * \
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sound_frequency) / GBC_BASE_RATE) * 2; \
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\
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sound_update_frequency_step(timer_number); \
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adjust_sound_buffer(timer_number, 0); \
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adjust_sound_buffer(timer_number, 1); \
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} \
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} \
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} \
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else \
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{ \
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if(timer[timer_number].status != TIMER_INACTIVE) \
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{ \
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timer[timer_number].status = TIMER_INACTIVE; \
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timer[timer_number].stop_cpu_ticks = cpu_ticks; \
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} \
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} \
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address16(io_registers, 0x102 + (timer_number * 4)) = value; \
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#endif // IN_MEMORY_C
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void change_ext(const char *src, char *buffer, const char *extension);
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void set_clock_speed();
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#endif
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