3 * Copyright (C) 2006 Exophase <exophase@gmail.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
39 TIMER_DS_CHANNEL_NONE,
43 } timer_ds_channel_type;
51 fixed16_16 frequency_step;
52 timer_ds_channel_type direct_sound_channels;
54 timer_status_type status;
65 extern u32 frame_ticks;
66 extern u32 execute_cycles;
67 extern frameskip_type current_frameskip_type;
68 extern u32 frameskip_value;
69 extern u32 random_skip;
70 extern u32 global_cycles_per_instruction;
71 extern u32 synchronize_flag;
72 extern u32 skip_next_frame;
74 extern u32 cycle_memory_access;
75 extern u32 cycle_pc_relative_access;
76 extern u32 cycle_sp_relative_access;
77 extern u32 cycle_block_memory_access;
78 extern u32 cycle_block_memory_sp_access;
79 extern u32 cycle_block_memory_words;
80 extern u32 cycle_dma16_words;
81 extern u32 cycle_dma32_words;
82 extern u32 flush_ram_count;
84 extern u64 base_timestamp;
86 extern char main_path[512];
88 extern u32 update_backup_flag;
89 extern u32 clock_speed;
95 void delay_us(u32 us_count);
96 void get_ticks_us(u64 *tick_return);
97 void game_name_ext(char *src, char *buffer, char *extension);
98 void main_write_mem_savestate(file_tag_type savestate_file);
99 void main_read_savestate(file_tag_type savestate_file);
104 u32 file_length(char *filename, s32 dummy);
108 u32 file_length(char *dummy, FILE *fp);
112 extern u32 real_frame_count;
113 extern u32 virtual_frame_count;
114 extern u32 max_frameskip;
115 extern u32 num_skipped_frames;
119 extern timer_type timer[4];
120 static u32 prescale_table[] = { 0, 6, 8, 10 };
122 #define count_timer(timer_number) \
123 timer[timer_number].reload = 0x10000 - value; \
124 if(timer_number < 2) \
127 timer[timer_number].reload << timer[timer_number].prescale; \
128 sound_update_frequency_step(timer_number); \
131 #define adjust_sound_buffer(timer_number, channel) \
132 if(timer[timer_number].direct_sound_channels & (0x01 << channel)) \
134 direct_sound_channel[channel].buffer_index = \
135 (direct_sound_channel[channel].buffer_index + buffer_adjust) % \
139 #define trigger_timer(timer_number) \
142 if(timer[timer_number].status == TIMER_INACTIVE) \
144 u32 prescale = prescale_table[value & 0x03]; \
145 u32 timer_reload = timer[timer_number].reload; \
147 if((value >> 2) & 0x01) \
148 timer[timer_number].status = TIMER_CASCADE; \
150 timer[timer_number].status = TIMER_PRESCALE; \
152 timer[timer_number].prescale = prescale; \
153 timer[timer_number].irq = (value >> 6) & 0x01; \
155 address16(io_registers, 0x100 + (timer_number * 4)) = \
158 timer_reload <<= prescale; \
159 timer[timer_number].count = timer_reload; \
161 if(timer_reload < execute_cycles) \
162 execute_cycles = timer_reload; \
164 if(timer_number < 2) \
166 u32 buffer_adjust = \
167 (u32)(((float)(cpu_ticks - timer[timer_number].stop_cpu_ticks) * \
168 sound_frequency) / 16777216.0) * 2; \
170 sound_update_frequency_step(timer_number); \
171 adjust_sound_buffer(timer_number, 0); \
172 adjust_sound_buffer(timer_number, 1); \
178 if(timer[timer_number].status != TIMER_INACTIVE) \
180 timer[timer_number].status = TIMER_INACTIVE; \
181 timer[timer_number].stop_cpu_ticks = cpu_ticks; \
184 address16(io_registers, 0x102 + (timer_number * 4)) = value; \
186 #endif // IN_MEMORY_C
188 void change_ext(const char *src, char *buffer, const char *extension);
190 void set_clock_speed();