giz renderers and stuff
[picodrive.git] / platform / gizmondo / emu.c
index 3d5fae7..8a57556 100644 (file)
 #include <windows.h>
+#include <string.h>
 
+#include <sys/stat.h>  // mkdir
+#include <sys/types.h>
+
+#include "kgsdk/Framework.h"
+#include "kgsdk/Framework2D.h"
+#include "kgsdk/FrameworkAudio.h"
+#include "../common/emu.h"
+#include "../common/lprintf.h"
+#include "../common/arm_utils.h"
 #include "emu.h"
+#include "menu.h"
+#include "giz.h"
+#include "asm_utils.h"
+
+#include <Pico/PicoInt.h>
+
+#ifdef BENCHMARK
+#define OSD_FPS_X 220
+#else
+#define OSD_FPS_X 260
+#endif
 
+// main 300K gfx-related buffer. Used by menu and renderers.
+unsigned char gfx_buffer[321*240*2*2];
 char romFileName[MAX_PATH];
 int engineState;
-currentConfig_t currentConfig;
 
-unsigned char *rom_data = NULL;
-unsigned char *PicoDraw2FB = NULL;  // temporary buffer for alt renderer
-int state_slot = 0;
+unsigned char *PicoDraw2FB = gfx_buffer;  // temporary buffer for alt renderer ( (8+320)*(8+240+8) )
 int reset_timing = 0;
-int config_slot = 0, config_slot_current = 0;
-
-
-
-
-int  emu_ReloadRom(void){}
-void emu_Init(void){}
-void emu_Deinit(void){}
-int  emu_SaveLoadGame(int load, int sram){}
-void emu_Loop(void){}
-void emu_ResetGame(void){}
-int  emu_ReadConfig(int game, int no_defaults){}
-int  emu_WriteConfig(int game){}
-char *emu_GetSaveFName(int load, int is_sram, int slot){}
-int  emu_check_save_file(int slot){}
-void emu_set_save_cbs(int gz){}
-void emu_forced_frame(void){}
-int  emu_cd_check(char **bios_file){}
-int  find_bios(int region, char **bios_file){}
-void scaling_update(void){}
+
+static DWORD noticeMsgTime = 0;
+
+
+static void blit(const char *fps, const char *notice);
+static void clearArea(int full);
+
+void emu_noticeMsgUpdated(void)
+{
+       noticeMsgTime = GetTickCount();
+}
+
+void emu_getMainDir(char *dst, int len)
+{
+       if (len > 0) *dst = 0;
+}
+
+static void emu_msg_cb(const char *msg)
+{
+       if (giz_screen == NULL)
+               giz_screen = Framework2D_LockBuffer();
+
+       memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
+       emu_textOut16(4, 232, msg);
+       noticeMsgTime = GetTickCount() - 2000;
+
+       /* assumption: emu_msg_cb gets called only when something slow is about to happen */
+       reset_timing = 1;
+}
+
+static void emu_state_cb(const char *str)
+{
+       if (giz_screen == NULL)
+               giz_screen = Framework2D_LockBuffer();
+
+       clearArea(0);
+       blit("", str);
+
+       Framework2D_UnlockBuffer();
+       giz_screen = NULL;
+}
+
+static void emu_msg_tray_open(void)
+{
+       strcpy(noticeMsg, "CD tray opened");
+       noticeMsgTime = GetTickCount();
+}
+
+
+void emu_Init(void)
+{
+       // make dirs for saves, cfgs, etc.
+       mkdir("mds", 0777);
+       mkdir("srm", 0777);
+       mkdir("brm", 0777);
+       mkdir("cfg", 0777);
+
+       PicoInit();
+       PicoMessage = emu_msg_cb;
+       PicoMCDopenTray = emu_msg_tray_open;
+       PicoMCDcloseTray = menu_loop_tray;
+}
+
+void emu_Deinit(void)
+{
+       // save SRAM
+       if((currentConfig.EmuOpt & 1) && SRam.changed) {
+               emu_SaveLoadGame(0, 1);
+               SRam.changed = 0;
+       }
+
+       if (!(currentConfig.EmuOpt & 0x20)) {
+               FILE *f = fopen(PicoConfigFile, "r+b");
+               if (!f) emu_WriteConfig(0);
+               else {
+                       // if we already have config, reload it, except last ROM
+                       fseek(f, sizeof(currentConfig.lastRomFile), SEEK_SET);
+                       fread(&currentConfig.EmuOpt, 1, sizeof(currentConfig) - sizeof(currentConfig.lastRomFile), f);
+                       fseek(f, 0, SEEK_SET);
+                       fwrite(&currentConfig, 1, sizeof(currentConfig), f);
+                       fflush(f);
+                       fclose(f);
+               }
+       }
+
+       PicoExit();
+}
+
+void emu_setDefaultConfig(void)
+{
+       memset(&currentConfig, 0, sizeof(currentConfig));
+       currentConfig.lastRomFile[0] = 0;
+       currentConfig.EmuOpt  = 0x1f | 0x680; // | confirm_save, cd_leds, 16bit rend
+       currentConfig.PicoOpt = 0x0f | 0xc00; // | cd_pcm, cd_cdda
+       currentConfig.PsndRate = 22050;
+       currentConfig.PicoRegion = 0; // auto
+       currentConfig.PicoAutoRgnOrder = 0x184; // US, EU, JP
+       currentConfig.Frameskip = 0;//-1; // auto
+       currentConfig.volume = 50;
+       currentConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
+       currentConfig.KeyBinds[ 3] = 1<<1;
+       currentConfig.KeyBinds[ 0] = 1<<2;
+       currentConfig.KeyBinds[ 1] = 1<<3;
+       currentConfig.KeyBinds[ 5] = 1<<4;
+       currentConfig.KeyBinds[ 6] = 1<<5;
+       currentConfig.KeyBinds[ 7] = 1<<6;
+       currentConfig.KeyBinds[ 4] = 1<<7;
+       currentConfig.KeyBinds[13] = 1<<26; // switch rend
+       currentConfig.KeyBinds[ 8] = 1<<27; // save state
+       currentConfig.KeyBinds[ 9] = 1<<28; // load state
+       currentConfig.KeyBinds[12] = 1<<29; // vol up
+       currentConfig.KeyBinds[11] = 1<<30; // vol down
+       currentConfig.PicoCDBuffers = 64;
+       currentConfig.scaling = 0;
+}
+
+
+static int EmuScan16(unsigned int num, void *sdata)
+{
+       if (!(Pico.video.reg[1]&8)) num += 8;
+       DrawLineDest = (unsigned short *) giz_screen + 321*(num+1);
+
+       return 0;
+}
+
+static int EmuScan8(unsigned int num, void *sdata)
+{
+       // draw like the fast renderer
+       if (!(Pico.video.reg[1]&8)) num += 8;
+       HighCol = gfx_buffer + 328*(num+1);
+
+       return 0;
+}
+
+static void osd_text(int x, int y, const char *text)
+{
+       int len = strlen(text) * 8 / 2;
+       int *p, h;
+       for (h = 0; h < 8; h++) {
+               p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
+               p = (int *) ((int)p & ~3); // align
+               memset32(p, 0, len);
+       }
+       emu_textOut16(x, y, text);
+}
+
+/*
+void log1(void *p1, void *p2)
+{
+       lprintf("%p %p %p\n", p1, p2, DrawLineDest);
+}
+*/
+
+static void cd_leds(void)
+{
+       static int old_reg = 0;
+       unsigned int col_g, col_r, *p;
+
+       if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
+       old_reg = Pico_mcd->s68k_regs[0];
+
+       p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
+       col_g = (old_reg & 2) ? 0x06000600 : 0;
+       col_r = (old_reg & 1) ? 0xc000c000 : 0;
+       *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
+       *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
+       *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
+}
+
+
+static short localPal[0x100];
+
+static void blit(const char *fps, const char *notice)
+{
+       int emu_opt = currentConfig.EmuOpt;
+
+       if (PicoOpt&0x10)
+       {
+               int lines_flags = 224;
+               // 8bit fast renderer
+               if (Pico.m.dirtyPal) {
+                       Pico.m.dirtyPal = 0;
+                       vidConvCpyRGB565(localPal, Pico.cram, 0x40);
+               }
+               if (!(Pico.video.reg[12]&1)) lines_flags|=0x100;
+               vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
+       }
+       else if (!(emu_opt&0x80))
+       {
+               int lines_flags;
+               // 8bit accurate renderer
+               if (Pico.m.dirtyPal) {
+                       Pico.m.dirtyPal = 0;
+                       vidConvCpyRGB565(localPal, Pico.cram, 0x40);
+                       if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
+                               //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
+                               //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
+                               blockcpy(localPal+0xc0, localPal+0x40, 0x40*2);
+                               localPal[0xc0] = 0x0600;
+                               localPal[0xd0] = 0xc000;
+                               localPal[0xe0] = 0x0000; // reserved pixels for OSD
+                               localPal[0xf0] = 0xffff;
+                       }
+                       /* no support
+                       else if (rendstatus & 0x20) { // mid-frame palette changes
+                               vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
+                               vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
+                       } */
+               }
+               lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
+               if (!(Pico.video.reg[12]&1)) lines_flags|=0x100;
+               vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
+       }
+
+       if (notice || (emu_opt & 2)) {
+               int h = 232;
+               if (notice)      osd_text(4, h, notice);
+               if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
+       }
+
+       if ((emu_opt & 0x400) && (PicoMCD & 1))
+               cd_leds();
+}
+
+// clears whole screen or just the notice area (in all buffers)
+static void clearArea(int full)
+{
+       if (giz_screen == NULL)
+               giz_screen = Framework2D_LockBuffer();
+       if (full) memset32(giz_screen, 0, 320*240*2/4);
+       else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
+}
+
+static void vidResetMode(void)
+{
+       giz_screen = Framework2D_LockBuffer();
+
+       if (PicoOpt&0x10) {
+       } else if (currentConfig.EmuOpt&0x80) {
+               PicoDrawSetColorFormat(1);
+               PicoScan = EmuScan16;
+       } else {
+               PicoDrawSetColorFormat(-1);
+               PicoScan = EmuScan8;
+       }
+       if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
+               // setup pal for 8-bit modes
+               localPal[0xc0] = 0x0600;
+               localPal[0xd0] = 0xc000;
+               localPal[0xe0] = 0x0000; // reserved pixels for OSD
+               localPal[0xf0] = 0xffff;
+       }
+       Pico.m.dirtyPal = 1;
+
+       memset32(giz_screen, 0, 321*240*2/4);
+       Framework2D_UnlockBuffer();
+       giz_screen = NULL;
+}
+
+
+static void SkipFrame(int do_audio)
+{
+       PicoSkipFrame=do_audio ? 1 : 2;
+       PicoFrame();
+       PicoSkipFrame=0;
+}
+
+void emu_forcedFrame(void)
+{
+       // TODO
+}
+
+static void RunEvents(unsigned int which)
+{
+       if (which & 0x1800) { // save or load (but not both)
+               int do_it = 1;
+               if ( emu_checkSaveFile(state_slot) &&
+                               (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) ||   // load
+                                (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) { // save
+                       int keys;
+                       blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
+                       while( !((keys = Framework_PollGetButtons()) & (BTN_PLAY|BTN_STOP)) )
+                               Sleep(50);
+                       if (keys & BTN_STOP) do_it = 0;
+                       clearArea(0);
+               }
+               if (do_it) {
+                       osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
+                       PicoStateProgressCB = emu_state_cb;
+                       emu_SaveLoadGame((which & 0x1000) >> 12, 0);
+                       PicoStateProgressCB = NULL;
+               }
+
+               reset_timing = 1;
+       }
+       if (which & 0x0400) { // switch renderer
+               if      (  PicoOpt&0x10)             { PicoOpt&=~0x10; currentConfig.EmuOpt |= 0x80; }
+               else if (!(currentConfig.EmuOpt&0x80)) PicoOpt|= 0x10;
+               else   currentConfig.EmuOpt &= ~0x80;
+
+               vidResetMode();
+
+               if (PicoOpt&0x10) {
+                       strcpy(noticeMsg, " 8bit fast renderer");
+               } else if (currentConfig.EmuOpt&0x80) {
+                       strcpy(noticeMsg, "16bit accurate renderer");
+               } else {
+                       strcpy(noticeMsg, " 8bit accurate renderer");
+               }
+
+               noticeMsgTime = GetTickCount();
+       }
+       if (which & 0x0300) {
+               if(which&0x0200) {
+                       state_slot -= 1;
+                       if(state_slot < 0) state_slot = 9;
+               } else {
+                       state_slot += 1;
+                       if(state_slot > 9) state_slot = 0;
+               }
+               sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_checkSaveFile(state_slot) ? "USED" : "FREE");
+               noticeMsgTime = GetTickCount();
+       }
+}
+
+static void updateKeys(void)
+{
+       unsigned int keys, allActions[2] = { 0, 0 }, events;
+       static unsigned int prevEvents = 0;
+       int i;
+
+       keys = Framework_PollGetButtons();
+       if (keys & BTN_HOME) {
+               engineState = PGS_Menu;
+               // wait until select is released, so menu would not resume game
+               while (Framework_PollGetButtons() & BTN_HOME) Sleep(50);
+       }
+
+       keys &= CONFIGURABLE_KEYS;
+
+       for (i = 0; i < 32; i++)
+       {
+               if (keys & (1 << i)) {
+                       int pl, acts = currentConfig.KeyBinds[i];
+                       if (!acts) continue;
+                       pl = (acts >> 16) & 1;
+                       /* TODO if (combo_keys & (1 << i)) {
+                               int u = i+1, acts_c = acts & combo_acts;
+                               // let's try to find the other one
+                               if (acts_c)
+                                       for (; u < 32; u++)
+                                               if ( (currentConfig.KeyBinds[u] & acts_c) && (keys & (1 << u)) ) {
+                                                       allActions[pl] |= acts_c;
+                                                       keys &= ~((1 << i) | (1 << u));
+                                                       break;
+                                               }
+                               // add non-combo actions if combo ones were not found
+                               if (!acts_c || u == 32)
+                                       allActions[pl] |= acts & ~combo_acts;
+                       } else */ {
+                               allActions[pl] |= acts;
+                       }
+               }
+       }
+
+       PicoPad[0] = (unsigned short) allActions[0];
+       PicoPad[1] = (unsigned short) allActions[1];
+
+       events = (allActions[0] | allActions[1]) >> 16;
+
+       // volume is treated in special way and triggered every frame
+       if (events & 0x6000) {
+               int vol = currentConfig.volume;
+               if (events & 0x2000) {
+                       if (vol < 100) vol++;
+               } else {
+                       if (vol >   0) vol--;
+               }
+               //gp2x_sound_volume(vol, vol);
+               sprintf(noticeMsg, "VOL: %02i", vol);
+               noticeMsgTime = GetTickCount();
+               currentConfig.volume = vol;
+       }
+
+       events &= ~prevEvents;
+       if (events) RunEvents(events);
+       if (movie_data) emu_updateMovie();
+
+       prevEvents = (allActions[0] | allActions[1]) >> 16;
+}
+
+static void simpleWait(DWORD until)
+{
+       DWORD tval;
+       int diff;
+
+       tval = GetTickCount();
+       diff = (int)until - (int)tval;
+       if (diff >= 2)
+               Sleep(diff - 1);
+
+       while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
+               spend_cycles(1024*2);
+}
+
+void emu_Loop(void)
+{
+       //static int PsndRate_old = 0, PicoOpt_old = 0, PsndLen_real = 0, pal_old = 0;
+       char fpsbuff[24]; // fps count c string
+       DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
+       int frames_done = 0, frames_shown = 0, oldmodes = 0;
+       int target_fps, target_frametime, lim_time, tval_diff, i;
+       char *notice = NULL;
+
+       lprintf("entered emu_Loop()\n");
+
+       fpsbuff[0] = 0;
+
+       // make sure we are in correct mode
+       vidResetMode();
+       if (currentConfig.scaling) PicoOpt|=0x4000;
+       else PicoOpt&=~0x4000;
+       Pico.m.dirtyPal = 1;
+       oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
+       //find_combos(); // TODO
+
+       // pal/ntsc might have changed, reset related stuff
+       target_fps = Pico.m.pal ? 50 : 60;
+       target_frametime = (1000<<8)/target_fps;
+       reset_timing = 1;
+
+       // prepare sound stuff
+/*     if (currentConfig.EmuOpt & 4) {
+               int snd_excess_add;
+               if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
+                       sound_rerate(Pico.m.frame_count ? 1 : 0);
+               }
+               snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
+               lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
+                       PsndRate, PsndLen, snd_excess_add, (PicoOpt&8)>>3, Pico.m.pal);
+               gp2x_start_sound(PsndRate, 16, (PicoOpt&8)>>3);
+               gp2x_sound_volume(currentConfig.volume, currentConfig.volume);
+               PicoWriteSound = updateSound;
+               memset(sndBuffer, 0, sizeof(sndBuffer));
+               PsndOut = sndBuffer;
+               PsndRate_old = PsndRate;
+               PsndLen_real = PsndLen;
+               PicoOpt_old  = PicoOpt;
+               pal_old = Pico.m.pal;
+       } else*/ {
+               PsndOut = 0;
+       }
+
+       // prepare CD buffer
+       if (PicoMCD & 1) PicoCDBufferInit();
+
+       // loop?
+       while (engineState == PGS_Running)
+       {
+               int modes;
+
+               tval = GetTickCount();
+               if (reset_timing || tval < tval_prev) {
+                       reset_timing = 0;
+                       tval_thissec = tval;
+                       frames_shown = frames_done = 0;
+               }
+
+               // show notice message?
+               if (noticeMsgTime) {
+                       static int noticeMsgSum;
+                       if (tval - noticeMsgTime > 2000) { // > 2.0 sec
+                               noticeMsgTime = 0;
+                               clearArea(0);
+                               notice = 0;
+                       } else {
+                               int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
+                               if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
+                               notice = noticeMsg;
+                       }
+               }
+
+               // check for mode changes
+               modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
+               if (modes != oldmodes) {
+                       oldmodes = modes;
+                       clearArea(1);
+               }
+
+               // second passed?
+               if (tval - tval_thissec >= 1000)
+               {
+#ifdef BENCHMARK
+                       static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
+                       if(++bench == 10) {
+                               bench = 0;
+                               bench_fps_s = bench_fps;
+                               bf[bfp++ & 3] = bench_fps;
+                               bench_fps = 0;
+                       }
+                       bench_fps += frames_shown;
+                       sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
+#else
+                       if(currentConfig.EmuOpt & 2)
+                               sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
+#endif
+                       tval_thissec = tval;
+
+                       if (PsndOut == 0 && currentConfig.Frameskip >= 0) {
+                               frames_done = frames_shown = 0;
+                       } else {
+                               // it is quite common for this implementation to leave 1 fame unfinished
+                               // when second changes, but we don't want buffer to starve.
+                               if (PsndOut && frames_done < target_fps && frames_done > target_fps-5) {
+                                       updateKeys();
+                                       SkipFrame(1); frames_done++;
+                               }
+
+                               frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
+                               frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
+                               if (frames_shown > frames_done) frames_shown = frames_done;
+                       }
+               }
+#ifdef PFRAMES
+               sprintf(fpsbuff, "%i", Pico.m.frame_count);
+#endif
+
+               tval_prev = tval;
+               lim_time = (frames_done+1) * target_frametime;
+               if (currentConfig.Frameskip >= 0) // frameskip enabled
+               {
+                       for (i = 0; i < currentConfig.Frameskip; i++) {
+                               updateKeys();
+                               SkipFrame(1); frames_done++;
+                               if (PsndOut) { // do framelimitting if sound is enabled
+                                       int tval_diff;
+                                       tval = GetTickCount();
+                                       tval_diff = (int)(tval - tval_thissec) << 8;
+                                       if (tval_diff < lim_time) // we are too fast
+                                               simpleWait(tval + ((lim_time - tval_diff)>>8));
+                               }
+                               lim_time += target_frametime;
+                       }
+               }
+               else // auto frameskip
+               {
+                       int tval_diff;
+                       tval = GetTickCount();
+                       tval_diff = (int)(tval - tval_thissec) << 8;
+                       if (tval_diff > lim_time)
+                       {
+                               // no time left for this frame - skip
+                               if (tval_diff - lim_time >= (300<<8)) {
+                                       /* something caused a slowdown for us (disk access? cache flush?)
+                                        * try to recover by resetting timing... */
+                                       reset_timing = 1;
+                                       continue;
+                               }
+                               updateKeys();
+                               SkipFrame(tval_diff < lim_time+target_frametime*2); frames_done++;
+                               continue;
+                       }
+               }
+
+               updateKeys();
+
+               if (giz_screen == NULL && (currentConfig.EmuOpt&0x80))
+                       giz_screen = Framework2D_LockBuffer();
+               if (!(PicoOpt&0x10))
+                       PicoScan((unsigned) -1, NULL);
+
+               PicoFrame();
+
+               if (giz_screen == NULL)
+                       giz_screen = Framework2D_LockBuffer();
+
+               blit(fpsbuff, notice);
+
+               if (giz_screen != NULL) {
+                       Framework2D_UnlockBuffer();
+                       giz_screen = NULL;
+               }
+
+               // check time
+               tval = GetTickCount();
+               tval_diff = (int)(tval - tval_thissec) << 8;
+
+               if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
+                       reset_timing = 1;
+               else if (PsndOut != NULL || currentConfig.Frameskip < 0)
+               {
+                       // sleep if we are still too fast
+                       if (tval_diff < lim_time)
+                       {
+                               // we are too fast
+                               simpleWait(tval + ((lim_time - tval_diff) >> 8));
+                       }
+               }
+
+               frames_done++; frames_shown++;
+       }
+
+
+       if (PicoMCD & 1) PicoCDBufferFree();
+
+       // save SRAM
+       if ((currentConfig.EmuOpt & 1) && SRam.changed) {
+               emu_state_cb("Writing SRAM/BRAM..");
+               emu_SaveLoadGame(0, 1);
+               SRam.changed = 0;
+       }
+}
+
+
+void emu_ResetGame(void)
+{
+       PicoReset(0);
+       reset_timing = 1;
+}