mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-15 07:15:12 +01:00
678 lines
16 KiB
C
678 lines
16 KiB
C
/*
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dos.c --
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DOS interface code for the emulator
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*/
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#include "shared.h"
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#include "osd.h"
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#define FRAMES_PER_SECOND 60
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#define MSG_LEN 1024
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RGB vdp_palette[3][0x200];
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PALETTE gen_pal;
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BITMAP *gen_bmp;
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volatile int frame_skip = 1;
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volatile int frame_count = 0;
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volatile int frames_rendered = 0;
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volatile int frame_rate = 0;
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volatile int tick_count = 0;
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volatile int old_tick_count = 0;
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volatile int skip = 0;
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int quit = 0;
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unsigned char buf[STATE_SIZE];
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uint8 log_error = 1;
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uint8 debug_on = 0;
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void msg_print(int x, int y, char *fmt, ...)
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{
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int i = bitmap.viewport.x;
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int j = bitmap.viewport.y;
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va_list ap;
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char token[MSG_LEN];
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char str[MSG_LEN];
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strcpy(str, "\0");
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va_start(ap, fmt);
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vsprintf(token, fmt, ap);
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strcat(str, token);
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va_end(ap);
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textprintf_ex(gen_bmp, font, i+x+1, j+y , 0x00, -1, "%s", str);
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textprintf_ex(gen_bmp, font, i+x-1, j+y , 0x00, -1, "%s", str);
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textprintf_ex(gen_bmp, font, i+x , j+y+1, 0x00, -1, "%s", str);
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textprintf_ex(gen_bmp, font, i+x , j+y-1, 0x00, -1, "%s", str);
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textprintf_ex(gen_bmp, font, i+x , j+y , 0xffff, -1, "%s", str);
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}
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int main (int argc, char *argv[])
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{
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if(argc < 2)
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{
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printf("Genesis Plus - Sega Mega Drive emulator (v1.0)\n");
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printf("(C) 1999, 2000, 2001, 2002, 2003 Charles MacDonald\n");
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printf("Usage %s file.[bin|smd|zip] [-options]\n", argv[0]);
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printf("Type `%s -help' for a list of options.\n", argv[0]);
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exit(1);
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};
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if(stricmp(argv[1], "-help") == 0)
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{
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print_options();
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return (0);
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}
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error_init();
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cart.rom = malloc(0xA00000);
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memset(cart.rom, 0, 0xA00000);
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if(!load_rom(argv[1]))
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{
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printf("File `%s' not found.\n", argv[1]);
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return (0);
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}
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/* load BIOS */
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memset(bios_rom, 0, sizeof(bios_rom));
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FILE *f = fopen("./BIOS.bin", "rb");
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if (f!=NULL)
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{
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fread(&bios_rom, 0x800,1,f);
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fclose(f);
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int i;
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for(i = 0; i < 0x800; i += 2)
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{
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uint8 temp = bios_rom[i];
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bios_rom[i] = bios_rom[i+1];
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bios_rom[i+1] = temp;
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}
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config.tmss |= 2;
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}
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/* initialize genesis VM */
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init_machine();
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/* default config */
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do_config("genplus.cfg");
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set_config_defaults();
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/* initialize emulation */
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system_init();
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audio_init(option.sndrate, vdp_pal ? 50 : 60);
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f = fopen("./game.srm", "rb");
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if (f!=NULL)
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{
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fread(&sram.sram,0x10000,1, f);
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fclose(f);
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}
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/* reset emulation */
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system_reset();
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/* emulation loop */
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for(;;)
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{
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dos_update_input();
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frame_count += 1;
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if(quit) break;
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if(frame_count % frame_skip == 0)
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{
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system_frame(0);
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frames_rendered++;
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dos_update_video();
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}
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else
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{
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system_frame(1);
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}
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audio_update();
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if(option.sound)
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dos_update_audio();
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}
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f = fopen("./game.srm", "wb");
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if (f!=NULL)
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{
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fwrite(&sram.sram, 0x10000,1,f);
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fclose(f);
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}
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trash_machine();
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system_shutdown();
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error_shutdown();
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free(cart.rom);
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return (0);
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}
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/* Timer handler */
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void tick_handler(void)
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{
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tick_count += 1;
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if(tick_count % FRAMES_PER_SECOND == 0)
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{
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frame_rate = frames_rendered;
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frames_rendered = 0;
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}
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}
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END_OF_FUNCTION(tick_handler);
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int load_file(char *filename, char *buf, int size)
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{
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FILE *fd = fopen(filename, "rb");
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if(!fd) return (0);
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fread(buf, size, 1, fd);
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fclose(fd);
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return (1);
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}
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int save_file(char *filename, char *buf, int size)
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{
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FILE *fd = NULL;
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if(!(fd = fopen(filename, "wb"))) return (0);
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fwrite(buf, size, 1, fd);
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fclose(fd);
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return (1);
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}
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static int joynum = 0;
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void dos_update_input(void)
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{
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FILE *f;
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if(key[KEY_ESC] || key[KEY_END])
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{
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quit = 1;
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}
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while (input.dev[joynum] == NO_DEVICE)
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{
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joynum ++;
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if (joynum > MAX_DEVICES - 1) joynum = 0;
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}
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if(check_key(KEY_F11))
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{
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joynum ++;
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if (joynum > MAX_DEVICES - 1) joynum = 0;
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while (input.dev[joynum] == NO_DEVICE)
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{
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joynum ++;
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if (joynum > MAX_DEVICES - 1) joynum = 0;
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}
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}
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input.pad[joynum] = 0;
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/* Is the joystick being used ? */
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if(option.joy_driver != JOY_TYPE_NONE)
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{
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poll_joystick();
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/* Check player 1 joystick */
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if(joy[0].stick[0].axis[1].d1) input.pad[0] |= INPUT_UP;
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else
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if(joy[0].stick[0].axis[1].d2) input.pad[0] |= INPUT_DOWN;
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if(joy[0].stick[0].axis[0].d1) input.pad[0] |= INPUT_LEFT;
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else
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if(joy[0].stick[0].axis[0].d2) input.pad[0] |= INPUT_RIGHT;
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if(joy[0].button[0].b) input.pad[0] |= INPUT_A;
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if(joy[0].button[1].b) input.pad[0] |= INPUT_B;
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if(joy[0].button[2].b) input.pad[0] |= INPUT_C;
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if(joy[0].button[3].b) input.pad[0] |= INPUT_START;
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if(joy[0].button[4].b) input.pad[0] |= INPUT_X;
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if(joy[0].button[5].b) input.pad[0] |= INPUT_Y;
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if(joy[0].button[6].b) input.pad[0] |= INPUT_Z;
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if(joy[0].button[7].b) input.pad[0] |= INPUT_MODE;
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/* More than one joystick supported ? */
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if(num_joysticks > 2)
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{
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/* Check player 2 joystick */
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if(joy[1].stick[0].axis[1].d1) input.pad[1] |= INPUT_UP;
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else
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if(joy[1].stick[0].axis[1].d2) input.pad[1] |= INPUT_DOWN;
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if(joy[1].stick[0].axis[0].d1) input.pad[1] |= INPUT_LEFT;
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else
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if(joy[1].stick[0].axis[0].d1) input.pad[1] |= INPUT_RIGHT;
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if(joy[1].button[0].b) input.pad[1] |= INPUT_A;
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if(joy[1].button[1].b) input.pad[1] |= INPUT_B;
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if(joy[1].button[2].b) input.pad[1] |= INPUT_C;
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if(joy[1].button[3].b) input.pad[1] |= INPUT_START;
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if(joy[1].button[4].b) input.pad[1] |= INPUT_X;
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if(joy[1].button[5].b) input.pad[1] |= INPUT_Y;
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if(joy[1].button[6].b) input.pad[1] |= INPUT_Z;
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if(joy[1].button[7].b) input.pad[1] |= INPUT_MODE;
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}
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}
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/* keyboard */
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if(key[KEY_UP]) input.pad[joynum] |= INPUT_UP;
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else
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if(key[KEY_DOWN]) input.pad[joynum] |= INPUT_DOWN;
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if(key[KEY_LEFT]) input.pad[joynum] |= INPUT_LEFT;
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else
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if(key[KEY_RIGHT]) input.pad[joynum] |= INPUT_RIGHT;
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if(key[KEY_A]) input.pad[joynum] |= INPUT_A;
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if(key[KEY_S]) input.pad[joynum] |= INPUT_B;
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if(key[KEY_D]) input.pad[joynum] |= INPUT_C;
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if(key[KEY_Z]) input.pad[joynum] |= INPUT_X;
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if(key[KEY_X]) input.pad[joynum] |= INPUT_Y;
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if(key[KEY_C]) input.pad[joynum] |= INPUT_Z;
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if(key[KEY_V]) input.pad[joynum] |= INPUT_MODE;
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if(key[KEY_F]) input.pad[joynum] |= INPUT_START;
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extern uint8 pico_current;
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if (input.dev[joynum] == DEVICE_LIGHTGUN)
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{
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/* Poll mouse if necessary */
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if(mouse_needs_poll() == TRUE)
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poll_mouse();
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/* Calculate X Y axis values */
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input.analog[joynum - 4][0] = (mouse_x * bitmap.viewport.w) / SCREEN_W;
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input.analog[joynum - 4][1] = (mouse_y * bitmap.viewport.h) / SCREEN_H;
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/* Map mouse buttons to player #1 inputs */
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if(mouse_b & 4) input.pad[joynum] |= INPUT_C;
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if(mouse_b & 2) input.pad[joynum] |= INPUT_B;
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if(mouse_b & 1) input.pad[joynum] |= INPUT_A;
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}
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else if (input.dev[joynum] == DEVICE_MOUSE)
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{
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/* Poll mouse if necessary */
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if(mouse_needs_poll() == TRUE)
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poll_mouse();
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/* Get X & Y quantity of movement */
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get_mouse_mickeys(&input.analog[2][0], &input.analog[2][1]);
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/* Sega Mouse range is -256;+256 */
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input.analog[2][0] = (input.analog[2][0] * 256) / SCREEN_W;
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input.analog[2][1] = (input.analog[2][1] * 256) / SCREEN_H;
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/* Vertical movement is upsidedown */
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if (!config.invert_mouse) input.analog[2][1] = 0 - input.analog[2][1];
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/* Map mouse buttons to player #1 inputs */
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if(mouse_b & 4) input.pad[joynum] |= INPUT_C;
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if(mouse_b & 1) input.pad[joynum] |= INPUT_B;
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if(mouse_b & 2) input.pad[joynum] |= INPUT_A;
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}
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else if (system_hw == SYSTEM_PICO)
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{
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/* Poll mouse if necessary */
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if(mouse_needs_poll() == TRUE)
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poll_mouse();
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/* Calculate X Y axis values */
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input.analog[0][0] = 0x3c + (mouse_x * (0x17c-0x03c+1)) / SCREEN_W;
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input.analog[0][1] = 0x1fc + (mouse_y * (0x2f7-0x1fc+1)) / SCREEN_H;
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/* Map mouse buttons to player #1 inputs */
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if(mouse_b & 2) input.pad[0] |= INPUT_B;
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if(mouse_b & 1) input.pad[0] |= INPUT_A;
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if(mouse_b & 4) pico_current++;
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if (pico_current > 6) pico_current = 0;
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}
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if(check_key(KEY_F1)) frame_skip = 1;
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if(check_key(KEY_F2)) frame_skip = 2;
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if(check_key(KEY_F3)) frame_skip = 3;
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if(check_key(KEY_F4)) frame_skip = 4;
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if(check_key(KEY_F5)) log_error ^= 1;
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if(check_key(KEY_F6)) debug_on ^= 1;
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if(check_key(KEY_F7))
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{
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f = fopen("game.gpz","r+b");
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if (f)
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{
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fread(&buf, STATE_SIZE, 1, f);
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state_load(buf);
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fclose(f);
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}
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}
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if(check_key(KEY_F8))
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{
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f = fopen("game.gpz","w+b");
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if (f)
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{
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state_save(buf);
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fwrite(&buf, STATE_SIZE, 1, f);
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fclose(f);
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}
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}
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if(check_key(KEY_F9))
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{
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vdp_pal ^= 1;
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/* save YM2612 context */
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unsigned char *temp = malloc(YM2612GetContextSize());
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if (temp)
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memcpy(temp, YM2612GetContextPtr(), YM2612GetContextSize());
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/* reinitialize all timings */
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audio_init(snd.sample_rate, snd.frame_rate);
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system_init();
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/* restore YM2612 context */
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if (temp)
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{
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YM2612Restore(temp);
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free(temp);
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}
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/* reinitialize VC max value */
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vc_max = 0xEA + 24*vdp_pal;
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if (reg[1] & 8)
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{
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vc_max += (28 - 20*vdp_pal);
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}
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/* reinitialize overscan area */
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bitmap.viewport.y = (config.overscan & 1) ? (((reg[1] & 8) ? 0 : 8) + (vdp_pal ? 24 : 0)) : 0;
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}
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if(check_key(KEY_F10)) set_softreset();
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if(check_key(KEY_TAB)) system_reset();
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}
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void dos_update_audio(void)
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{
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osd_play_streamed_sample_16(option.swap ^ 0, snd.buffer[0], snd.buffer_size * 2, option.sndrate, FRAMES_PER_SECOND, -100);
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osd_play_streamed_sample_16(option.swap ^ 1, snd.buffer[1], snd.buffer_size * 2, option.sndrate, FRAMES_PER_SECOND, 100);
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}
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#if 0
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void dos_update_palette(void)
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{
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if(is_border_dirty)
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{
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uint16 data = *(uint16 *)&cram[(border << 1)];
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RGB *color;
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is_border_dirty = 0;
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if(reg[12] & 8)
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{
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int j;
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for(j = 0; j < 3; j += 1)
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{
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color = &vdp_palette[j][data];
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set_color((j << 6), color);
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}
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}
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else
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{
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color = &vdp_palette[1][data];
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set_color(0x00, color);
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set_color(0x40, color);
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set_color(0x80, color);
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}
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}
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if(is_color_dirty)
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{
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int i;
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uint16 *p = (uint16 *)&cram[0];
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is_color_dirty = 0;
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for(i = 0; i < 64; i += 1)
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{
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if((color_dirty[i]) && ((i & 0x0F) != 0x00))
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{
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RGB *color;
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color_dirty[i] = 0;
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if(reg[12] & 8)
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{
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int j;
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for(j = 0; j < 3; j += 1)
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{
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color = &vdp_palette[j][p[i]];
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set_color((j << 6) | i, color);
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}
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}
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else
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{
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color = &vdp_palette[1][p[i]];
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set_color(0x00 | i, color);
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set_color(0x40 | i, color);
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set_color(0x80 | i, color);
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}
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}
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}
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}
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}
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#endif
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void dos_update_video(void)
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{
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int width = (bitmap.viewport.w + 2 * bitmap.viewport.x);
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int height = (bitmap.viewport.h + 2 * bitmap.viewport.y) << (interlaced ? 1:0);
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int center_x = (SCREEN_W - width) / 2;
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int center_y = (SCREEN_H / (option.scanlines ? 4 : 2)) - (height / 2);
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/* Wait for VSync */
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if(option.vsync) vsync();
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if(bitmap.viewport.changed)
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{
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bitmap.viewport.changed = 0;
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if(bitmap.remap)
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{
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clear(screen);
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}
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else
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{
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clear_to_color(screen, 0xFF);
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}
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}
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#if 0
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if(bitmap.remap == 0)
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{
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dos_update_palette();
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}
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#endif
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msg_print(2, 2, "%d", frame_rate);
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if(option.scanlines)
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{
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int y;
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for(y = 0; y < height; y += 1)
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{
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blit(gen_bmp, screen, 0x0, y, center_x, (center_y + y) << 1, width, 1);
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}
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}
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else
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{
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stretch_blit(gen_bmp, screen, 0, 0, width, height, (SCREEN_W-352)/2, (SCREEN_H-240)/2, 352,240 << (interlaced ? 1:0));
|
|
}
|
|
}
|
|
|
|
void init_machine(void)
|
|
{
|
|
do_config("gen.cfg");
|
|
|
|
if(option.sound)
|
|
{
|
|
msdos_init_sound(&option.sndrate, option.sndcard);
|
|
}
|
|
|
|
allegro_init();
|
|
install_mouse();
|
|
install_keyboard();
|
|
install_joystick(option.joy_driver);
|
|
|
|
install_timer();
|
|
LOCK_FUNCTION(tick_handler);
|
|
LOCK_VARIABLE(tick_count);
|
|
LOCK_VARIABLE(frame_rate);
|
|
install_int_ex(tick_handler, BPS_TO_TIMER(FRAMES_PER_SECOND));
|
|
|
|
set_color_depth(option.video_depth);
|
|
gen_bmp = create_bitmap(720, 576);
|
|
clear(gen_bmp);
|
|
|
|
memset(&bitmap, 0, sizeof(bitmap));
|
|
bitmap.data = (uint8 *)&gen_bmp->line[0][0];
|
|
bitmap.width = gen_bmp->w;
|
|
bitmap.height = gen_bmp->h;
|
|
bitmap.depth = option.video_depth;
|
|
switch(option.video_depth)
|
|
{
|
|
case 8:
|
|
bitmap.granularity = 1;
|
|
break;
|
|
case 15:
|
|
bitmap.granularity = 2;
|
|
break;
|
|
case 16:
|
|
bitmap.granularity = 2;
|
|
break;
|
|
case 32:
|
|
bitmap.granularity = 4;
|
|
break;
|
|
}
|
|
bitmap.pitch = (bitmap.width * bitmap.granularity);
|
|
bitmap.viewport.w = 256;
|
|
bitmap.viewport.h = 224;
|
|
bitmap.viewport.x = 0x00;
|
|
bitmap.viewport.y = 0x00;
|
|
bitmap.remap = 0;
|
|
if(option.remap) bitmap.remap = 1;
|
|
else
|
|
if(bitmap.depth > 8) bitmap.remap = 1;
|
|
|
|
make_vdp_palette();
|
|
|
|
memcpy(gen_pal, black_palette, sizeof(PALETTE));
|
|
gen_pal[0xFE].r = \
|
|
gen_pal[0xFE].g = \
|
|
gen_pal[0xFE].b = 0x3F;
|
|
|
|
dos_change_mode();
|
|
}
|
|
|
|
void trash_machine(void)
|
|
{
|
|
if(option.sound)
|
|
{
|
|
msdos_shutdown_sound();
|
|
}
|
|
clear(screen);
|
|
destroy_bitmap(gen_bmp);
|
|
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
|
|
}
|
|
|
|
void make_vdp_palette(void)
|
|
{
|
|
uint8 lut[3][8] =
|
|
{
|
|
{0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C},
|
|
{0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38},
|
|
{0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C},
|
|
};
|
|
|
|
int j;
|
|
for(j = 0; j < 0x600; j += 1)
|
|
{
|
|
|
|
int r = (j >> 6) & 7;
|
|
int g = (j >> 3) & 7;
|
|
int b = (j >> 0) & 7;
|
|
int i = (j >> 9) & 3;
|
|
|
|
vdp_palette[i][j & 0x1FF].r = lut[i][r];
|
|
vdp_palette[i][j & 0x1FF].g = lut[i][g];
|
|
vdp_palette[i][j & 0x1FF].b = lut[i][b];
|
|
}
|
|
}
|
|
|
|
void dos_change_mode(void)
|
|
{
|
|
int ret;
|
|
int width = option.video_width;
|
|
int height = option.video_height;
|
|
|
|
if(option.scanlines) height *= 2;
|
|
ret = set_gfx_mode(option.video_driver, width, height, 0, 0);
|
|
if(ret != 0)
|
|
{
|
|
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
|
|
printf("Error setting graphics mode (%dx%d %dbpp).\nAllegro says: `%s'\n", width, height, option.video_depth, allegro_error);
|
|
exit(1);
|
|
}
|
|
|
|
if(bitmap.depth == 8)
|
|
{
|
|
if(bitmap.remap)
|
|
{
|
|
int i;
|
|
for(i = 0; i < 0x100; i += 1)
|
|
{
|
|
gen_pal[i].r = ((i >> 5) & 7) << 3;
|
|
gen_pal[i].g = ((i >> 2) & 7) << 3;
|
|
gen_pal[i].b = ((i >> 0) & 3) << 4;
|
|
}
|
|
set_palette(gen_pal);
|
|
}
|
|
else
|
|
{
|
|
clear_to_color(screen, 0xFF);
|
|
gen_pal[0xfe].r = 0xff;
|
|
gen_pal[0xfe].g = 0xff;
|
|
gen_pal[0xfe].b = 0xff;
|
|
set_palette(gen_pal);
|
|
inp(0x3DA);
|
|
outp(0x3C0, 0x31);
|
|
outp(0x3C0, 0xFF);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
clear(screen);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* Check if a key is pressed */
|
|
int check_key(int code)
|
|
{
|
|
static char lastbuf[0x100] = {0};
|
|
|
|
if((!key[code]) && (lastbuf[code] == 1))
|
|
lastbuf[code] = 0;
|
|
|
|
if((key[code]) && (lastbuf[code] == 0))
|
|
{
|
|
lastbuf[code] = 1;
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|