mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-13 22:35:10 +01:00
651 lines
16 KiB
C
651 lines
16 KiB
C
#include <windows.h>
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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 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, as_obtained;
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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_S16LSB;
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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, &as_obtained) == -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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if(as_desired.samples != as_obtained.samples) {
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MessageBox(NULL, "SDL Audio wrong setup", "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) * 11;
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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()
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{
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int i;
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short* p;
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int size = audio_update();
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if (use_sound)
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{
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SDL_LockAudio();
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p = (short*)sdl_sound.current_pos;
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for(i = 0; i < size; ++i) {
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*p = snd.buffer[0][i];
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++p;
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*p = snd.buffer[1][i];
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++p;
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}
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sdl_sound.current_pos = (char*)p;
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sdl_sound.current_emulated_samples += size * 2 * 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_WM_SetCaption("Genesis Plus/SDL", NULL);
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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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system_frame(0);
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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 (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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}
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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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if (sdl_video.surf_bitmap)
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SDL_FreeSurface(sdl_video.surf_bitmap);
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if (sdl_video.surf_screen)
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SDL_FreeSurface(sdl_video.surf_screen);
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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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/* 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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char caption[100];
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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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int fps = vdp_pal ? (sdl_video.frames_rendered / 3) : sdl_video.frames_rendered;
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sdl_sync.ticks = sdl_video.frames_rendered = 0;
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sprintf(caption, "Genesis Plus SDL - %d FPS", fps);
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SDL_WM_SetCaption(caption, NULL);
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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 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_init();
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system_reset();
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break;
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}
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case SDLK_F2:
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{
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if (fullscreen) fullscreen = 0;
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else fullscreen = 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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config.render ^=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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/*config.ntsc ++;
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if (config.ntsc > 3) config.ntsc = 0;
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bitmap.viewport.changed = 1;*/
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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) turbo_mode ^=1;
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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.gpz","r+b");
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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.gpz","w+b");
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if (f)
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{
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uint8 buf[STATE_SIZE];
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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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break;
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}
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case SDLK_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 HVC tables */
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vctab = vdp_pal ? ((reg[1] & 8) ? vc_pal_240 : vc_pal_224) : vc_ntsc_224;
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hctab = (reg[12] & 1) ? cycle2hc40 : cycle2hc32;
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/* reinitialize overscan area */
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bitmap.viewport.x = (config.overscan & 2) ? ((reg[12] & 1) ? 16 : 12) : 0;
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bitmap.viewport.y = (config.overscan & 1) ? (((reg[1] & 8) ? 0 : 8) + (vdp_pal ? 24 : 0)) : 0;
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bitmap.viewport.changed = 1;
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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_softreset(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 ^= 1;
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bitmap.viewport.x = (config.overscan & 2) ? ((reg[12] & 1) ? 16 : 12) : 0;
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bitmap.viewport.y = (config.overscan & 1) ? (((reg[1] & 8) ? 0 : 8) + (vdp_pal ? 24 : 0)) : 0;
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bitmap.viewport.changed = 1;
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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 ++;
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if (joynum > MAX_DEVICES - 1)
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joynum = 0;
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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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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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/* reset input */
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input.pad[joynum] = 0;
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/* keyboard */
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if(keystate[SDLK_a]) input.pad[joynum] |= INPUT_A;
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if(keystate[SDLK_s]) input.pad[joynum] |= INPUT_B;
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if(keystate[SDLK_d]) input.pad[joynum] |= INPUT_C;
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if(keystate[SDLK_f]) input.pad[joynum] |= INPUT_START;
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if(keystate[SDLK_z]) input.pad[joynum] |= INPUT_X;
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if(keystate[SDLK_x]) input.pad[joynum] |= INPUT_Y;
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if(keystate[SDLK_c]) input.pad[joynum] |= INPUT_Z;
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if(keystate[SDLK_v]) input.pad[joynum] |= INPUT_MODE;
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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 (absolute values) */
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int x,y;
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int state = SDL_GetMouseState(&x,&y);
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/* Calculate X Y axis values */
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input.analog[joynum - 4][0] = (x * bitmap.viewport.w) / 640;
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input.analog[joynum - 4][1] = (y * bitmap.viewport.h) / 480;
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/* Map mouse buttons to player #1 inputs */
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if(state & SDL_BUTTON_MMASK) input.pad[joynum] |= INPUT_C;
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if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_B;
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if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_A;
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break;
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}
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case DEVICE_MOUSE:
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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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/* Sega Mouse range is -256;+256 */
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input.analog[2][0] = x;
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input.analog[2][1] = y;
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/* Vertical movement is upsidedown */
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if (!config.invert_mouse)
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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(state & SDL_BUTTON_MMASK) input.pad[joynum] |= INPUT_C;
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if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_B;
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if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_A;
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break;
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}
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default:
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{
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if(keystate[SDLK_UP]) input.pad[joynum] |= INPUT_UP;
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else
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if(keystate[SDLK_DOWN]) input.pad[joynum] |= INPUT_DOWN;
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if(keystate[SDLK_LEFT]) input.pad[joynum] |= INPUT_LEFT;
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else
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if(keystate[SDLK_RIGHT]) input.pad[joynum] |= INPUT_RIGHT;
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break;
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}
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}
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if (system_hw == SYSTEM_PICO)
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{
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/* get mouse (absolute values) */
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int x,y;
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int state = SDL_GetMouseState(&x,&y);
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/* Calculate X Y axis values */
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input.analog[0][0] = 0x3c + (x * (0x17c-0x03c+1)) / VIDEO_WIDTH;
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input.analog[0][1] = 0x1fc + (y * (0x2f7-0x1fc+1)) / VIDEO_HEIGHT;
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/* Map mouse buttons to player #1 inputs */
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if(state & SDL_BUTTON_MMASK) pico_current++;
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if(state & SDL_BUTTON_RMASK) input.pad[joynum] |= INPUT_B;
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if(state & SDL_BUTTON_LMASK) input.pad[joynum] |= INPUT_A;
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}
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free (keystate);
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return 1;
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}
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int main (int argc, char **argv)
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{
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int running = 1;
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/* Print help if no game specified */
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if(argc < 2)
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{
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char caption[256];
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sprintf(caption, "Genesis Plus\\SDL by Charles MacDonald\nWWW: http://cgfm2.emuviews.com\nusage: %s gamename\n", argv[0]);
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MessageBox(NULL, caption, "Information", 0);
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exit(1);
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}
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/* set default config */
|
|
error_init();
|
|
set_config_defaults();
|
|
|
|
/* Load ROM file */
|
|
cart.rom = malloc(10*1024*1024);
|
|
memset(cart.rom, 0, 10*1024*1024);
|
|
if(!load_rom(argv[1]))
|
|
{
|
|
char caption[256];
|
|
sprintf(caption, "Error loading file `%s'.", argv[1]);
|
|
MessageBox(NULL, caption, "Error", 0);
|
|
exit(1);
|
|
}
|
|
|
|
/* load BIOS */
|
|
memset(bios_rom, 0, sizeof(bios_rom));
|
|
FILE *f = fopen(OS_ROM, "rb");
|
|
if (f!=NULL)
|
|
{
|
|
fread(&bios_rom, 0x800,1,f);
|
|
fclose(f);
|
|
int i;
|
|
for(i = 0; i < 0x800; i += 2)
|
|
{
|
|
uint8 temp = bios_rom[i];
|
|
bios_rom[i] = bios_rom[i+1];
|
|
bios_rom[i+1] = temp;
|
|
}
|
|
config.tmss |= 2;
|
|
}
|
|
|
|
/* initialize SDL */
|
|
if(SDL_Init(0) < 0)
|
|
{
|
|
char caption[256];
|
|
sprintf(caption, "SDL initialization failed");
|
|
MessageBox(NULL, caption, "Error", 0);
|
|
exit(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;
|
|
bitmap.depth = 16;
|
|
bitmap.granularity = 2;
|
|
bitmap.pitch = (bitmap.width * bitmap.granularity);
|
|
bitmap.data = sdl_video.surf_bitmap->pixels;
|
|
SDL_UnlockSurface(sdl_video.surf_bitmap);
|
|
bitmap.viewport.changed = 3;
|
|
|
|
/* initialize emulation */
|
|
audio_init(SOUND_FREQUENCY, vdp_pal ? 50:60);
|
|
//audio_init(SOUND_FREQUENCY, 1000000.0/16715.0);
|
|
system_init();
|
|
|
|
/* load SRAM */
|
|
f = fopen("./game.srm", "rb");
|
|
if (f!=NULL)
|
|
{
|
|
fread(sram.sram,0x10000,1, f);
|
|
fclose(f);
|
|
}
|
|
|
|
/* reset emulation */
|
|
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_QUIT:
|
|
running = 0;
|
|
break;
|
|
|
|
case SDL_KEYDOWN:
|
|
running = sdl_control_update(event.key.keysym.sym);
|
|
break;
|
|
}
|
|
}
|
|
|
|
sdl_video_update();
|
|
sdl_sound_update();
|
|
|
|
if(!turbo_mode && sdl_sync.sem_sync && sdl_video.frames_rendered % 3 == 0)
|
|
{
|
|
SDL_SemWait(sdl_sync.sem_sync);
|
|
}
|
|
|
|
}
|
|
|
|
/* save SRAM */
|
|
f = fopen("./game.srm", "wb");
|
|
if (f!=NULL)
|
|
{
|
|
fwrite(sram.sram,0x10000,1, f);
|
|
fclose(f);
|
|
}
|
|
|
|
system_shutdown();
|
|
audio_shutdown();
|
|
error_shutdown();
|
|
free(cart.rom);
|
|
|
|
sdl_video_close();
|
|
sdl_sound_close();
|
|
sdl_sync_close();
|
|
SDL_Quit();
|
|
|
|
return 0;
|
|
}
|