gpsp/main.h
notaz 2f1c528a6c tweak sound buffering and timing to better match pandora's refresh.
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.
2011-09-08 00:48:33 +03:00

193 lines
7.5 KiB
C

/* 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 MAIN_H
#define MAIN_H
typedef enum
{
TIMER_INACTIVE,
TIMER_PRESCALE,
TIMER_CASCADE
} timer_status_type;
typedef enum
{
TIMER_NO_IRQ,
TIMER_TRIGGER_IRQ
} timer_irq_type;
typedef enum
{
TIMER_DS_CHANNEL_NONE,
TIMER_DS_CHANNEL_A,
TIMER_DS_CHANNEL_B,
TIMER_DS_CHANNEL_BOTH
} timer_ds_channel_type;
typedef struct
{
s32 count;
u32 reload;
u32 prescale;
u32 stop_cpu_ticks;
fixed8_24 frequency_step;
timer_ds_channel_type direct_sound_channels;
timer_irq_type irq;
timer_status_type status;
} timer_type;
typedef enum
{
auto_frameskip,
manual_frameskip,
no_frameskip
} frameskip_type;
extern u32 cpu_ticks;
extern u32 frame_ticks;
extern u32 execute_cycles;
extern frameskip_type current_frameskip_type;
extern u32 frameskip_value;
extern u32 random_skip;
extern u32 global_cycles_per_instruction;
extern u32 synchronize_flag;
extern u32 skip_next_frame;
extern u32 cycle_memory_access;
extern u32 cycle_pc_relative_access;
extern u32 cycle_sp_relative_access;
extern u32 cycle_block_memory_access;
extern u32 cycle_block_memory_sp_access;
extern u32 cycle_block_memory_words;
extern u32 cycle_dma16_words;
extern u32 cycle_dma32_words;
extern u32 flush_ram_count;
extern u64 base_timestamp;
extern char main_path[512];
extern u32 update_backup_flag;
extern u32 clock_speed;
u32 update_gba();
void reset_gba();
void synchronize();
void quit();
void delay_us(u32 us_count);
void get_ticks_us(u64 *tick_return);
void game_name_ext(char *src, char *buffer, char *extension);
void main_write_mem_savestate(file_tag_type savestate_file);
void main_read_savestate(file_tag_type savestate_file);
#ifdef PSP_BUILD
u32 file_length(char *filename, s32 dummy);
#else
u32 file_length(char *dummy, FILE *fp);
#endif
extern u32 real_frame_count;
extern u32 virtual_frame_count;
extern u32 max_frameskip;
extern u32 num_skipped_frames;
#ifdef IN_MEMORY_C
extern timer_type timer[4];
static u32 prescale_table[] = { 0, 6, 8, 10 };
#define count_timer(timer_number) \
timer[timer_number].reload = 0x10000 - value; \
if(timer_number < 2) \
{ \
u32 timer_reload = \
timer[timer_number].reload << timer[timer_number].prescale; \
sound_update_frequency_step(timer_number); \
} \
#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 + buffer_adjust) % BUFFER_SIZE; \
} \
#define trigger_timer(timer_number) \
if(value & 0x80) \
{ \
if(timer[timer_number].status == TIMER_INACTIVE) \
{ \
u32 prescale = prescale_table[value & 0x03]; \
u32 timer_reload = timer[timer_number].reload; \
\
if((value >> 2) & 0x01) \
timer[timer_number].status = TIMER_CASCADE; \
else \
timer[timer_number].status = TIMER_PRESCALE; \
\
timer[timer_number].prescale = prescale; \
timer[timer_number].irq = (value >> 6) & 0x01; \
\
address16(io_registers, 0x100 + (timer_number * 4)) = \
-timer_reload; \
\
timer_reload <<= prescale; \
timer[timer_number].count = timer_reload; \
\
if(timer_reload < execute_cycles) \
execute_cycles = timer_reload; \
\
if(timer_number < 2) \
{ \
u32 buffer_adjust = \
(u32)(((float)(cpu_ticks - gbc_sound_last_cpu_ticks) * \
sound_frequency) / GBC_BASE_RATE) * 2; \
\
sound_update_frequency_step(timer_number); \
adjust_sound_buffer(timer_number, 0); \
adjust_sound_buffer(timer_number, 1); \
} \
} \
} \
else \
{ \
if(timer[timer_number].status != TIMER_INACTIVE) \
{ \
timer[timer_number].status = TIMER_INACTIVE; \
timer[timer_number].stop_cpu_ticks = cpu_ticks; \
} \
} \
address16(io_registers, 0x102 + (timer_number * 4)) = value; \
#endif // IN_MEMORY_C
void change_ext(const char *src, char *buffer, const char *extension);
void set_clock_speed();
#endif