mirror of
https://github.com/libretro/Genesis-Plus-GX.git
synced 2024-11-24 00:39:45 +00:00
942 lines
24 KiB
C
942 lines
24 KiB
C
#ifdef __WIN32__
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#include <windows.h>
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#else
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#define MessageBox(owner, text, caption, type) printf("%s: %s\n", caption, text)
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#endif
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#include "SDL.h"
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#include "SDL_thread.h"
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#include "shared.h"
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#include "sms_ntsc.h"
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#include "md_ntsc.h"
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#define SOUND_FREQUENCY 48000
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#define SOUND_SAMPLES_SIZE 2048
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#define VIDEO_WIDTH 320
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#define VIDEO_HEIGHT 240
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int joynum = 0;
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int log_error = 0;
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int debug_on = 0;
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int turbo_mode = 0;
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int use_sound = 1;
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int fullscreen = 0; /* SDL_FULLSCREEN */
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/* sound */
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struct {
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char* current_pos;
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char* buffer;
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int current_emulated_samples;
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} sdl_sound;
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static uint8 brm_format[0x40] =
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{
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0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x00,0x00,0x00,0x00,0x40,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x53,0x45,0x47,0x41,0x5f,0x43,0x44,0x5f,0x52,0x4f,0x4d,0x00,0x01,0x00,0x00,0x00,
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0x52,0x41,0x4d,0x5f,0x43,0x41,0x52,0x54,0x52,0x49,0x44,0x47,0x45,0x5f,0x5f,0x5f
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};
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static short soundframe[SOUND_SAMPLES_SIZE];
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static void sdl_sound_callback(void *userdata, Uint8 *stream, int len)
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{
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if(sdl_sound.current_emulated_samples < len) {
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memset(stream, 0, len);
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}
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else {
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memcpy(stream, sdl_sound.buffer, len);
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/* loop to compensate desync */
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do {
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sdl_sound.current_emulated_samples -= len;
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} while(sdl_sound.current_emulated_samples > 2 * len);
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memcpy(sdl_sound.buffer,
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sdl_sound.current_pos - sdl_sound.current_emulated_samples,
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sdl_sound.current_emulated_samples);
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sdl_sound.current_pos = sdl_sound.buffer + sdl_sound.current_emulated_samples;
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}
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}
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static int sdl_sound_init()
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{
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int n;
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SDL_AudioSpec as_desired;
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if(SDL_Init(SDL_INIT_AUDIO) < 0) {
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MessageBox(NULL, "SDL Audio initialization failed", "Error", 0);
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return 0;
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}
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as_desired.freq = SOUND_FREQUENCY;
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as_desired.format = AUDIO_S16SYS;
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as_desired.channels = 2;
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as_desired.samples = SOUND_SAMPLES_SIZE;
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as_desired.callback = sdl_sound_callback;
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if(SDL_OpenAudio(&as_desired, NULL) == -1) {
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MessageBox(NULL, "SDL Audio open failed", "Error", 0);
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return 0;
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}
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sdl_sound.current_emulated_samples = 0;
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n = SOUND_SAMPLES_SIZE * 2 * sizeof(short) * 20;
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sdl_sound.buffer = (char*)malloc(n);
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if(!sdl_sound.buffer) {
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MessageBox(NULL, "Can't allocate audio buffer", "Error", 0);
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return 0;
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}
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memset(sdl_sound.buffer, 0, n);
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sdl_sound.current_pos = sdl_sound.buffer;
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return 1;
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}
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static void sdl_sound_update(int enabled)
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{
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int size = audio_update(soundframe) * 2;
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if (enabled)
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{
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int i;
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short *out;
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SDL_LockAudio();
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out = (short*)sdl_sound.current_pos;
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for(i = 0; i < size; i++)
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{
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*out++ = soundframe[i];
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}
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sdl_sound.current_pos = (char*)out;
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sdl_sound.current_emulated_samples += size * sizeof(short);
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SDL_UnlockAudio();
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}
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}
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static void sdl_sound_close()
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{
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SDL_PauseAudio(1);
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SDL_CloseAudio();
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if (sdl_sound.buffer)
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free(sdl_sound.buffer);
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}
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/* video */
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md_ntsc_t *md_ntsc;
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sms_ntsc_t *sms_ntsc;
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struct {
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SDL_Surface* surf_screen;
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SDL_Surface* surf_bitmap;
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SDL_Rect srect;
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SDL_Rect drect;
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Uint32 frames_rendered;
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} sdl_video;
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static int sdl_video_init()
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{
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if(SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
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MessageBox(NULL, "SDL Video initialization failed", "Error", 0);
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return 0;
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}
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sdl_video.surf_screen = SDL_SetVideoMode(VIDEO_WIDTH, VIDEO_HEIGHT, 16, SDL_SWSURFACE | fullscreen);
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sdl_video.surf_bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, 720, 576, 16, 0, 0, 0, 0);
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sdl_video.frames_rendered = 0;
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SDL_ShowCursor(0);
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return 1;
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}
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static void sdl_video_update()
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{
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if (system_hw == SYSTEM_MCD)
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{
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system_frame_scd(0);
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}
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else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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system_frame_gen(0);
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}
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else
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{
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system_frame_sms(0);
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}
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/* viewport size changed */
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if(bitmap.viewport.changed & 1)
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{
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bitmap.viewport.changed &= ~1;
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/* source bitmap */
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sdl_video.srect.w = bitmap.viewport.w+2*bitmap.viewport.x;
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sdl_video.srect.h = bitmap.viewport.h+2*bitmap.viewport.y;
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sdl_video.srect.x = 0;
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sdl_video.srect.y = 0;
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if (sdl_video.srect.w > VIDEO_WIDTH)
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{
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sdl_video.srect.x = (sdl_video.srect.w - VIDEO_WIDTH) / 2;
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sdl_video.srect.w = VIDEO_WIDTH;
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}
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if (sdl_video.srect.h > VIDEO_HEIGHT)
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{
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sdl_video.srect.y = (sdl_video.srect.h - VIDEO_HEIGHT) / 2;
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sdl_video.srect.h = VIDEO_HEIGHT;
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}
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/* destination bitmap */
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sdl_video.drect.w = sdl_video.srect.w;
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sdl_video.drect.h = sdl_video.srect.h;
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sdl_video.drect.x = (VIDEO_WIDTH - sdl_video.drect.w) / 2;
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sdl_video.drect.y = (VIDEO_HEIGHT - sdl_video.drect.h) / 2;
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/* clear destination surface */
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SDL_FillRect(sdl_video.surf_screen, 0, 0);
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#if 0
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if (config.render && (interlaced || config.ntsc)) rect.h *= 2;
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if (config.ntsc) rect.w = (reg[12]&1) ? MD_NTSC_OUT_WIDTH(rect.w) : SMS_NTSC_OUT_WIDTH(rect.w);
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if (config.ntsc)
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{
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sms_ntsc = (sms_ntsc_t *)malloc(sizeof(sms_ntsc_t));
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md_ntsc = (md_ntsc_t *)malloc(sizeof(md_ntsc_t));
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switch (config.ntsc)
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{
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case 1:
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sms_ntsc_init(sms_ntsc, &sms_ntsc_composite);
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md_ntsc_init(md_ntsc, &md_ntsc_composite);
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break;
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case 2:
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sms_ntsc_init(sms_ntsc, &sms_ntsc_svideo);
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md_ntsc_init(md_ntsc, &md_ntsc_svideo);
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break;
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case 3:
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sms_ntsc_init(sms_ntsc, &sms_ntsc_rgb);
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md_ntsc_init(md_ntsc, &md_ntsc_rgb);
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break;
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}
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}
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else
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{
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if (sms_ntsc)
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{
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free(sms_ntsc);
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sms_ntsc = NULL;
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}
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if (md_ntsc)
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{
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free(md_ntsc);
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md_ntsc = NULL;
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}
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}
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#endif
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}
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SDL_BlitSurface(sdl_video.surf_bitmap, &sdl_video.srect, sdl_video.surf_screen, &sdl_video.drect);
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SDL_UpdateRect(sdl_video.surf_screen, 0, 0, 0, 0);
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++sdl_video.frames_rendered;
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}
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static void sdl_video_close()
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{
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SDL_FreeSurface(sdl_video.surf_bitmap);
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}
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/* Timer Sync */
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struct {
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SDL_sem* sem_sync;
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unsigned ticks;
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} sdl_sync;
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static Uint32 sdl_sync_timer_callback(Uint32 interval)
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{
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SDL_SemPost(sdl_sync.sem_sync);
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sdl_sync.ticks++;
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if (sdl_sync.ticks == (vdp_pal ? 50 : 20))
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{
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SDL_Event event;
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SDL_UserEvent userevent;
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userevent.type = SDL_USEREVENT;
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userevent.code = vdp_pal ? (sdl_video.frames_rendered / 3) : sdl_video.frames_rendered;
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userevent.data1 = NULL;
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userevent.data2 = NULL;
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sdl_sync.ticks = sdl_video.frames_rendered = 0;
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event.type = SDL_USEREVENT;
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event.user = userevent;
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SDL_PushEvent(&event);
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}
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return interval;
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}
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static int sdl_sync_init()
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{
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if(SDL_InitSubSystem(SDL_INIT_TIMER|SDL_INIT_EVENTTHREAD) < 0)
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{
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MessageBox(NULL, "SDL Timer initialization failed", "Error", 0);
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return 0;
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}
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sdl_sync.sem_sync = SDL_CreateSemaphore(0);
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sdl_sync.ticks = 0;
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return 1;
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}
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static void sdl_sync_close()
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{
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if(sdl_sync.sem_sync)
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SDL_DestroySemaphore(sdl_sync.sem_sync);
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}
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static const uint16 vc_table[4][2] =
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{
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/* NTSC, PAL */
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{0xDA , 0xF2}, /* Mode 4 (192 lines) */
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{0xEA , 0x102}, /* Mode 5 (224 lines) */
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{0xDA , 0xF2}, /* Mode 4 (192 lines) */
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{0x106, 0x10A} /* Mode 5 (240 lines) */
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};
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static int sdl_control_update(SDLKey keystate)
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{
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switch (keystate)
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{
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case SDLK_TAB:
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{
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system_reset();
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break;
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}
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case SDLK_F1:
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{
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if (SDL_ShowCursor(-1)) SDL_ShowCursor(0);
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else SDL_ShowCursor(1);
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break;
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}
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case SDLK_F2:
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{
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fullscreen = (fullscreen ? 0 : SDL_FULLSCREEN);
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sdl_video.surf_screen = SDL_SetVideoMode(VIDEO_WIDTH, VIDEO_HEIGHT, 16, SDL_SWSURFACE | fullscreen);
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break;
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}
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case SDLK_F3:
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{
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if (config.bios == 0) config.bios = 3;
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else if (config.bios == 3) config.bios = 1;
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break;
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}
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case SDLK_F4:
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{
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if (!turbo_mode) use_sound ^= 1;
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break;
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}
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case SDLK_F5:
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{
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log_error ^= 1;
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break;
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}
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case SDLK_F6:
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{
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if (!use_sound)
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{
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turbo_mode ^=1;
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sdl_sync.ticks = 0;
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}
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break;
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}
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case SDLK_F7:
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{
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FILE *f = fopen("game.gp0","rb");
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if (f)
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{
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uint8 buf[STATE_SIZE];
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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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break;
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}
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case SDLK_F8:
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{
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FILE *f = fopen("game.gp0","wb");
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if (f)
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{
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uint8 buf[STATE_SIZE];
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int len = state_save(buf);
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fwrite(&buf, len, 1, f);
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fclose(f);
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}
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break;
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}
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case SDLK_F9:
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{
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config.region_detect = (config.region_detect + 1) % 5;
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get_region(0);
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/* framerate has changed, reinitialize audio timings */
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audio_init(snd.sample_rate, 0);
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/* system with region BIOS should be reinitialized */
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if ((system_hw == SYSTEM_MCD) || ((system_hw & SYSTEM_SMS) && (config.bios & 1)))
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{
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system_init();
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system_reset();
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}
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else
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{
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/* reinitialize I/O region register */
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if (system_hw == SYSTEM_MD)
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{
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io_reg[0x00] = 0x20 | region_code | (config.bios & 1);
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}
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else
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{
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io_reg[0x00] = 0x80 | (region_code >> 1);
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}
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/* reinitialize VDP */
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if (vdp_pal)
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{
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status |= 1;
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lines_per_frame = 313;
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}
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else
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{
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status &= ~1;
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lines_per_frame = 262;
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}
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/* reinitialize VC max value */
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switch (bitmap.viewport.h)
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{
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case 192:
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vc_max = vc_table[0][vdp_pal];
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break;
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case 224:
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vc_max = vc_table[1][vdp_pal];
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break;
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case 240:
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vc_max = vc_table[3][vdp_pal];
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break;
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}
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}
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break;
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}
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case SDLK_F10:
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{
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gen_reset(0);
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break;
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}
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case SDLK_F11:
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{
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config.overscan = (config.overscan + 1) & 3;
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if ((system_hw == SYSTEM_GG) && !config.gg_extra)
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{
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bitmap.viewport.x = (config.overscan & 2) ? 14 : -48;
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}
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else
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{
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bitmap.viewport.x = (config.overscan & 2) * 7;
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}
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bitmap.viewport.changed = 3;
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break;
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}
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case SDLK_F12:
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{
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joynum = (joynum + 1) % MAX_DEVICES;
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while (input.dev[joynum] == NO_DEVICE)
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{
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joynum = (joynum + 1) % MAX_DEVICES;
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}
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break;
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}
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case SDLK_ESCAPE:
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{
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return 0;
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}
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default:
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break;
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}
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return 1;
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}
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int sdl_input_update(void)
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{
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uint8 *keystate = SDL_GetKeyState(NULL);
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/* reset input */
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input.pad[joynum] = 0;
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switch (input.dev[joynum])
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{
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case DEVICE_LIGHTGUN:
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{
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/* get mouse coordinates (absolute values) */
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int x,y;
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int state = SDL_GetMouseState(&x,&y);
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/* X axis */
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input.analog[joynum][0] = x - (VIDEO_WIDTH-bitmap.viewport.w)/2;
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/* Y axis */
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input.analog[joynum][1] = y - (VIDEO_HEIGHT-bitmap.viewport.h)/2;
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/* TRIGGER, B, C (Menacer only), START (Menacer & Justifier only) */
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if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_A;
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if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_B;
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if(state & SDL_BUTTON_MMASK) input.pad[joynum] |= INPUT_C;
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if(keystate[SDLK_f]) input.pad[joynum] |= INPUT_START;
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break;
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}
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case DEVICE_PADDLE:
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{
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/* get mouse (absolute values) */
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int x;
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int state = SDL_GetMouseState(&x, NULL);
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/* Range is [0;256], 128 being middle position */
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input.analog[joynum][0] = x * 256 /VIDEO_WIDTH;
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/* Button I -> 0 0 0 0 0 0 0 I*/
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if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_B;
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break;
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}
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case DEVICE_SPORTSPAD:
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{
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/* get mouse (relative values) */
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int x,y;
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int state = SDL_GetRelativeMouseState(&x,&y);
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/* Range is [0;256] */
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input.analog[joynum][0] = (unsigned char)(-x & 0xFF);
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input.analog[joynum][1] = (unsigned char)(-y & 0xFF);
|
|
|
|
/* Buttons I & II -> 0 0 0 0 0 0 II I*/
|
|
if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_B;
|
|
if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_C;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_MOUSE:
|
|
{
|
|
/* get mouse (relative values) */
|
|
int x,y;
|
|
int state = SDL_GetRelativeMouseState(&x,&y);
|
|
|
|
/* Sega Mouse range is [-256;+256] */
|
|
input.analog[joynum][0] = x * 2;
|
|
input.analog[joynum][1] = y * 2;
|
|
|
|
/* Vertical movement is upsidedown */
|
|
if (!config.invert_mouse)
|
|
input.analog[joynum][1] = 0 - input.analog[joynum][1];
|
|
|
|
/* Start,Left,Right,Middle buttons -> 0 0 0 0 START MIDDLE RIGHT LEFT */
|
|
if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_B;
|
|
if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_C;
|
|
if(state & SDL_BUTTON_MMASK) input.pad[joynum] |= INPUT_A;
|
|
if(keystate[SDLK_f]) input.pad[joynum] |= INPUT_START;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_XE_1AP:
|
|
{
|
|
/* A,B,C,D,Select,START,E1,E2 buttons -> E1(?) E2(?) START SELECT(?) A B C D */
|
|
if(keystate[SDLK_a]) input.pad[joynum] |= INPUT_START;
|
|
if(keystate[SDLK_s]) input.pad[joynum] |= INPUT_A;
|
|
if(keystate[SDLK_d]) input.pad[joynum] |= INPUT_C;
|
|
if(keystate[SDLK_f]) input.pad[joynum] |= INPUT_Y;
|
|
if(keystate[SDLK_z]) input.pad[joynum] |= INPUT_B;
|
|
if(keystate[SDLK_x]) input.pad[joynum] |= INPUT_X;
|
|
if(keystate[SDLK_c]) input.pad[joynum] |= INPUT_MODE;
|
|
if(keystate[SDLK_v]) input.pad[joynum] |= INPUT_Z;
|
|
|
|
/* Left Analog Stick (bidirectional) */
|
|
if(keystate[SDLK_UP]) input.analog[joynum][1]-=2;
|
|
else if(keystate[SDLK_DOWN]) input.analog[joynum][1]+=2;
|
|
else input.analog[joynum][1] = 128;
|
|
if(keystate[SDLK_LEFT]) input.analog[joynum][0]-=2;
|
|
else if(keystate[SDLK_RIGHT]) input.analog[joynum][0]+=2;
|
|
else input.analog[joynum][0] = 128;
|
|
|
|
/* Right Analog Stick (unidirectional) */
|
|
if(keystate[SDLK_KP8]) input.analog[joynum+1][0]-=2;
|
|
else if(keystate[SDLK_KP2]) input.analog[joynum+1][0]+=2;
|
|
else if(keystate[SDLK_KP4]) input.analog[joynum+1][0]-=2;
|
|
else if(keystate[SDLK_KP6]) input.analog[joynum+1][0]+=2;
|
|
else input.analog[joynum+1][0] = 128;
|
|
|
|
/* Limiters */
|
|
if (input.analog[joynum][0] > 0xFF) input.analog[joynum][0] = 0xFF;
|
|
else if (input.analog[joynum][0] < 0) input.analog[joynum][0] = 0;
|
|
if (input.analog[joynum][1] > 0xFF) input.analog[joynum][1] = 0xFF;
|
|
else if (input.analog[joynum][1] < 0) input.analog[joynum][1] = 0;
|
|
if (input.analog[joynum+1][0] > 0xFF) input.analog[joynum+1][0] = 0xFF;
|
|
else if (input.analog[joynum+1][0] < 0) input.analog[joynum+1][0] = 0;
|
|
if (input.analog[joynum+1][1] > 0xFF) input.analog[joynum+1][1] = 0xFF;
|
|
else if (input.analog[joynum+1][1] < 0) input.analog[joynum+1][1] = 0;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_PICO:
|
|
{
|
|
/* get mouse (absolute values) */
|
|
int x,y;
|
|
int state = SDL_GetMouseState(&x,&y);
|
|
|
|
/* Calculate X Y axis values */
|
|
input.analog[0][0] = 0x3c + (x * (0x17c-0x03c+1)) / VIDEO_WIDTH;
|
|
input.analog[0][1] = 0x1fc + (y * (0x2f7-0x1fc+1)) / VIDEO_HEIGHT;
|
|
|
|
/* Map mouse buttons to player #1 inputs */
|
|
if(state & SDL_BUTTON_MMASK) pico_current = (pico_current + 1) & 7;
|
|
if(state & SDL_BUTTON_RMASK) input.pad[0] |= INPUT_PICO_RED;
|
|
if(state & SDL_BUTTON_LMASK) input.pad[0] |= INPUT_PICO_PEN;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_TEREBI:
|
|
{
|
|
/* get mouse (absolute values) */
|
|
int x,y;
|
|
int state = SDL_GetMouseState(&x,&y);
|
|
|
|
/* Calculate X Y axis values */
|
|
input.analog[0][0] = (x * 250) / VIDEO_WIDTH;
|
|
input.analog[0][1] = (y * 250) / VIDEO_HEIGHT;
|
|
|
|
/* Map mouse buttons to player #1 inputs */
|
|
if(state & SDL_BUTTON_RMASK) input.pad[0] |= INPUT_B;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_GRAPHIC_BOARD:
|
|
{
|
|
/* get mouse (absolute values) */
|
|
int x,y;
|
|
int state = SDL_GetMouseState(&x,&y);
|
|
|
|
/* Calculate X Y axis values */
|
|
input.analog[0][0] = (x * 255) / VIDEO_WIDTH;
|
|
input.analog[0][1] = (y * 255) / VIDEO_HEIGHT;
|
|
|
|
/* Map mouse buttons to player #1 inputs */
|
|
if(state & SDL_BUTTON_LMASK) input.pad[0] |= INPUT_GRAPHIC_PEN;
|
|
if(state & SDL_BUTTON_RMASK) input.pad[0] |= INPUT_GRAPHIC_MENU;
|
|
if(state & SDL_BUTTON_MMASK) input.pad[0] |= INPUT_GRAPHIC_DO;
|
|
|
|
break;
|
|
}
|
|
|
|
case DEVICE_ACTIVATOR:
|
|
{
|
|
if(keystate[SDLK_g]) input.pad[joynum] |= INPUT_ACTIVATOR_7L;
|
|
if(keystate[SDLK_h]) input.pad[joynum] |= INPUT_ACTIVATOR_7U;
|
|
if(keystate[SDLK_j]) input.pad[joynum] |= INPUT_ACTIVATOR_8L;
|
|
if(keystate[SDLK_k]) input.pad[joynum] |= INPUT_ACTIVATOR_8U;
|
|
}
|
|
|
|
default:
|
|
{
|
|
if(keystate[SDLK_a]) input.pad[joynum] |= INPUT_A;
|
|
if(keystate[SDLK_s]) input.pad[joynum] |= INPUT_B;
|
|
if(keystate[SDLK_d]) input.pad[joynum] |= INPUT_C;
|
|
if(keystate[SDLK_f]) input.pad[joynum] |= INPUT_START;
|
|
if(keystate[SDLK_z]) input.pad[joynum] |= INPUT_X;
|
|
if(keystate[SDLK_x]) input.pad[joynum] |= INPUT_Y;
|
|
if(keystate[SDLK_c]) input.pad[joynum] |= INPUT_Z;
|
|
if(keystate[SDLK_v]) input.pad[joynum] |= INPUT_MODE;
|
|
|
|
if(keystate[SDLK_UP]) input.pad[joynum] |= INPUT_UP;
|
|
else
|
|
if(keystate[SDLK_DOWN]) input.pad[joynum] |= INPUT_DOWN;
|
|
if(keystate[SDLK_LEFT]) input.pad[joynum] |= INPUT_LEFT;
|
|
else
|
|
if(keystate[SDLK_RIGHT]) input.pad[joynum] |= INPUT_RIGHT;
|
|
|
|
break;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
int main (int argc, char **argv)
|
|
{
|
|
FILE *fp;
|
|
int running = 1;
|
|
|
|
/* Print help if no game specified */
|
|
if(argc < 2)
|
|
{
|
|
char caption[256];
|
|
sprintf(caption, "Genesis Plus GX\\SDL\nusage: %s gamename\n", argv[0]);
|
|
MessageBox(NULL, caption, "Information", 0);
|
|
return 1;
|
|
}
|
|
|
|
/* set default config */
|
|
error_init();
|
|
set_config_defaults();
|
|
|
|
/* mark all BIOS as unloaded */
|
|
system_bios = 0;
|
|
|
|
/* Genesis BOOT ROM support (2KB max) */
|
|
memset(boot_rom, 0xFF, 0x800);
|
|
fp = fopen(MD_BIOS, "rb");
|
|
if (fp != NULL)
|
|
{
|
|
int i;
|
|
|
|
/* read BOOT ROM */
|
|
fread(boot_rom, 1, 0x800, fp);
|
|
fclose(fp);
|
|
|
|
/* check BOOT ROM */
|
|
if (!memcmp((char *)(boot_rom + 0x120),"GENESIS OS", 10))
|
|
{
|
|
/* mark Genesis BIOS as loaded */
|
|
system_bios = SYSTEM_MD;
|
|
}
|
|
|
|
/* Byteswap ROM */
|
|
for (i=0; i<0x800; i+=2)
|
|
{
|
|
uint8 temp = boot_rom[i];
|
|
boot_rom[i] = boot_rom[i+1];
|
|
boot_rom[i+1] = temp;
|
|
}
|
|
}
|
|
|
|
/* initialize SDL */
|
|
if(SDL_Init(0) < 0)
|
|
{
|
|
MessageBox(NULL, "SDL initialization failed", "Error", 0);
|
|
return 1;
|
|
}
|
|
sdl_video_init();
|
|
if (use_sound) sdl_sound_init();
|
|
sdl_sync_init();
|
|
|
|
/* initialize Genesis virtual system */
|
|
SDL_LockSurface(sdl_video.surf_bitmap);
|
|
memset(&bitmap, 0, sizeof(t_bitmap));
|
|
bitmap.width = 720;
|
|
bitmap.height = 576;
|
|
#if defined(USE_8BPP_RENDERING)
|
|
bitmap.pitch = (bitmap.width * 1);
|
|
#elif defined(USE_15BPP_RENDERING)
|
|
bitmap.pitch = (bitmap.width * 2);
|
|
#elif defined(USE_16BPP_RENDERING)
|
|
bitmap.pitch = (bitmap.width * 2);
|
|
#elif defined(USE_32BPP_RENDERING)
|
|
bitmap.pitch = (bitmap.width * 4);
|
|
#endif
|
|
bitmap.data = sdl_video.surf_bitmap->pixels;
|
|
SDL_UnlockSurface(sdl_video.surf_bitmap);
|
|
bitmap.viewport.changed = 3;
|
|
|
|
/* Load game file */
|
|
if(!load_rom(argv[1]))
|
|
{
|
|
char caption[256];
|
|
sprintf(caption, "Error loading file `%s'.", argv[1]);
|
|
MessageBox(NULL, caption, "Error", 0);
|
|
return 1;
|
|
}
|
|
|
|
/* initialize system hardware */
|
|
audio_init(SOUND_FREQUENCY, 0);
|
|
system_init();
|
|
|
|
/* Mega CD specific */
|
|
if (system_hw == SYSTEM_MCD)
|
|
{
|
|
/* load internal backup RAM */
|
|
fp = fopen("./scd.brm", "rb");
|
|
if (fp!=NULL)
|
|
{
|
|
fread(scd.bram, 0x2000, 1, fp);
|
|
fclose(fp);
|
|
}
|
|
|
|
/* check if internal backup RAM is formatted */
|
|
if (memcmp(scd.bram + 0x2000 - 0x20, brm_format + 0x20, 0x20))
|
|
{
|
|
/* clear internal backup RAM */
|
|
memset(scd.bram, 0x00, 0x200);
|
|
|
|
/* Internal Backup RAM size fields */
|
|
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = 0x00;
|
|
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (sizeof(scd.bram) / 64) - 3;
|
|
|
|
/* format internal backup RAM */
|
|
memcpy(scd.bram + 0x2000 - 0x40, brm_format, 0x40);
|
|
}
|
|
|
|
/* load cartridge backup RAM */
|
|
if (scd.cartridge.id)
|
|
{
|
|
fp = fopen("./cart.brm", "rb");
|
|
if (fp!=NULL)
|
|
{
|
|
fread(scd.cartridge.area, scd.cartridge.mask + 1, 1, fp);
|
|
fclose(fp);
|
|
}
|
|
|
|
/* check if cartridge backup RAM is formatted */
|
|
if (memcmp(scd.cartridge.area + scd.cartridge.mask + 1 - 0x20, brm_format + 0x20, 0x20))
|
|
{
|
|
/* clear cartridge backup RAM */
|
|
memset(scd.cartridge.area, 0x00, scd.cartridge.mask + 1);
|
|
|
|
/* Cartridge Backup RAM size fields */
|
|
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = (((scd.cartridge.mask + 1) / 64) - 3) >> 8;
|
|
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (((scd.cartridge.mask + 1) / 64) - 3) & 0xff;
|
|
|
|
/* format cartridge backup RAM */
|
|
memcpy(scd.cartridge.area + scd.cartridge.mask + 1 - sizeof(brm_format), brm_format, sizeof(brm_format));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sram.on)
|
|
{
|
|
/* load SRAM */
|
|
fp = fopen("./game.srm", "rb");
|
|
if (fp!=NULL)
|
|
{
|
|
fread(sram.sram,0x10000,1, fp);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
/* reset system hardware */
|
|
system_reset();
|
|
|
|
if(use_sound) SDL_PauseAudio(0);
|
|
|
|
/* 3 frames = 50 ms (60hz) or 60 ms (50hz) */
|
|
if(sdl_sync.sem_sync)
|
|
SDL_SetTimer(vdp_pal ? 60 : 50, sdl_sync_timer_callback);
|
|
|
|
/* emulation loop */
|
|
while(running)
|
|
{
|
|
SDL_Event event;
|
|
if (SDL_PollEvent(&event))
|
|
{
|
|
switch(event.type)
|
|
{
|
|
case SDL_USEREVENT:
|
|
{
|
|
char caption[100];
|
|
sprintf(caption,"Genesis Plus GX - %d fps - %s", event.user.code, (rominfo.international[0] != 0x20) ? rominfo.international : rominfo.domestic);
|
|
SDL_WM_SetCaption(caption, NULL);
|
|
break;
|
|
}
|
|
|
|
case SDL_QUIT:
|
|
{
|
|
running = 0;
|
|
break;
|
|
}
|
|
|
|
case SDL_KEYDOWN:
|
|
{
|
|
running = sdl_control_update(event.key.keysym.sym);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
sdl_video_update();
|
|
sdl_sound_update(use_sound);
|
|
|
|
if(!turbo_mode && sdl_sync.sem_sync && sdl_video.frames_rendered % 3 == 0)
|
|
{
|
|
SDL_SemWait(sdl_sync.sem_sync);
|
|
}
|
|
}
|
|
|
|
if (system_hw == SYSTEM_MCD)
|
|
{
|
|
/* save internal backup RAM (if formatted) */
|
|
if (!memcmp(scd.bram + 0x2000 - 0x20, brm_format + 0x20, 0x20))
|
|
{
|
|
fp = fopen("./scd.brm", "wb");
|
|
if (fp!=NULL)
|
|
{
|
|
fwrite(scd.bram, 0x2000, 1, fp);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
/* save cartridge backup RAM (if formatted) */
|
|
if (scd.cartridge.id)
|
|
{
|
|
if (!memcmp(scd.cartridge.area + scd.cartridge.mask + 1 - 0x20, brm_format + 0x20, 0x20))
|
|
{
|
|
fp = fopen("./cart.brm", "wb");
|
|
if (fp!=NULL)
|
|
{
|
|
fwrite(scd.cartridge.area, scd.cartridge.mask + 1, 1, fp);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sram.on)
|
|
{
|
|
/* save SRAM */
|
|
fp = fopen("./game.srm", "wb");
|
|
if (fp!=NULL)
|
|
{
|
|
fwrite(sram.sram,0x10000,1, fp);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
audio_shutdown();
|
|
error_shutdown();
|
|
|
|
sdl_video_close();
|
|
sdl_sound_close();
|
|
sdl_sync_close();
|
|
SDL_Quit();
|
|
|
|
return 0;
|
|
}
|