main.h

   1 /* gameplaySP
   2  *
   3  * Copyright (C) 2006 Exophase <exophase@gmail.com>
   4  *
   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.
   9  *
  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.
  14  *
  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
  18  */
  19
  20 #ifndef MAIN_H
  21 #define MAIN_H
  22
  23 typedef enum
  24 {
  25   TIMER_INACTIVE,
  26   TIMER_PRESCALE,
  27   TIMER_CASCADE
  28 } timer_status_type;
  29
  30 typedef enum
  31 {
  32   TIMER_NO_IRQ,
  33   TIMER_TRIGGER_IRQ
  34 } timer_irq_type;
  35
  36
  37 typedef enum
  38 {
  39   TIMER_DS_CHANNEL_NONE,
  40   TIMER_DS_CHANNEL_A,
  41   TIMER_DS_CHANNEL_B,
  42   TIMER_DS_CHANNEL_BOTH
  43 } timer_ds_channel_type;
  44
  45 typedef struct
  46 {
  47   s32 count;
  48   u32 reload;
  49   u32 prescale;
  50   u32 stop_cpu_ticks;
  51   fixed8_24 frequency_step;
  52   timer_ds_channel_type direct_sound_channels;
  53   timer_irq_type irq;
  54   timer_status_type status;
  55 } timer_type;
  56
  57 typedef enum
  58 {
  59   auto_frameskip,
  60   manual_frameskip,
  61   no_frameskip
  62 } frameskip_type;
  63
  64 extern u32 cpu_ticks;
  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;
  73
  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;
  83
  84 extern u64 base_timestamp;
  85
  86 extern char main_path[512];
  87
  88 extern u32 update_backup_flag;
  89 extern u32 clock_speed;
  90
  91 u32 update_gba();
  92 void reset_gba();
  93 void synchronize();
  94 void quit();
  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);
 100
 101
 102 #ifdef PSP_BUILD
 103
 104 u32 file_length(char *filename, s32 dummy);
 105
 106 #else
 107
 108 u32 file_length(char *dummy, FILE *fp);
 109
 110 #endif
 111
 112 extern u32 real_frame_count;
 113 extern u32 virtual_frame_count;
 114 extern u32 max_frameskip;
 115 extern u32 num_skipped_frames;
 116
 117 #ifdef IN_MEMORY_C
 118
 119 extern timer_type timer[4];
 120 static u32 prescale_table[] = { 0, 6, 8, 10 };
 121
 122 #define count_timer(timer_number)                                             \
 123   timer[timer_number].reload = 0x10000 - value;                               \
 124   if(timer_number < 2)                                                        \
 125   {                                                                           \
 126     u32 timer_reload =                                                        \
 127      timer[timer_number].reload << timer[timer_number].prescale;              \
 128     sound_update_frequency_step(timer_number);                                \
 129   }                                                                           \
 130
 131 #define adjust_sound_buffer(timer_number, channel)                            \
 132   if(timer[timer_number].direct_sound_channels & (0x01 << channel))           \
 133   {                                                                           \
 134     direct_sound_channel[channel].buffer_index =                              \
 135      (gbc_sound_buffer_index + buffer_adjust) % BUFFER_SIZE;                  \
 136   }                                                                           \
 137
 138 #define trigger_timer(timer_number)                                           \
 139   if(value & 0x80)                                                            \
 140   {                                                                           \
 141     if(timer[timer_number].status == TIMER_INACTIVE)                          \
 142     {                                                                         \
 143       u32 prescale = prescale_table[value & 0x03];                            \
 144       u32 timer_reload = timer[timer_number].reload;                          \
 145                                                                               \
 146       if((value >> 2) & 0x01)                                                 \
 147         timer[timer_number].status = TIMER_CASCADE;                           \
 148       else                                                                    \
 149         timer[timer_number].status = TIMER_PRESCALE;                          \
 150                                                                               \
 151       timer[timer_number].prescale = prescale;                                \
 152       timer[timer_number].irq = (value >> 6) & 0x01;                          \
 153                                                                               \
 154       address16(io_registers, 0x100 + (timer_number * 4)) =                   \
 155        -timer_reload;                                                         \
 156                                                                               \
 157       timer_reload <<= prescale;                                              \
 158       timer[timer_number].count = timer_reload;                               \
 159                                                                               \
 160       if(timer_reload < execute_cycles)                                       \
 161         execute_cycles = timer_reload;                                        \
 162                                                                               \
 163       if(timer_number < 2)                                                    \
 164       {                                                                       \
 165         u32 buffer_adjust =                                                   \
 166          (u32)(((float)(cpu_ticks - gbc_sound_last_cpu_ticks) *               \
 167          sound_frequency) / GBC_BASE_RATE) * 2;                               \
 168                                                                               \
 169         sound_update_frequency_step(timer_number);                            \
 170         adjust_sound_buffer(timer_number, 0);                                 \
 171         adjust_sound_buffer(timer_number, 1);                                 \
 172       }                                                                       \
 173     }                                                                         \
 174   }                                                                           \
 175   else                                                                        \
 176   {                                                                           \
 177     if(timer[timer_number].status != TIMER_INACTIVE)                          \
 178     {                                                                         \
 179       timer[timer_number].status = TIMER_INACTIVE;                            \
 180       timer[timer_number].stop_cpu_ticks = cpu_ticks;                         \
 181     }                                                                         \
 182   }                                                                           \
 183   address16(io_registers, 0x102 + (timer_number * 4)) = value;                \
 184
 185 #endif // IN_MEMORY_C
 186
 187 void change_ext(const char *src, char *buffer, const char *extension);
 188 void make_rpath(char *buff, size_t size, const char *ext);
 189
 190 void set_clock_speed();
 191
 192 #endif
 193
 194