X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=libpicofe.git;a=blobdiff_plain;f=pandora%2Femu.c;h=4a628c7638d5d5283dd8227ac37897092da58b88;hp=af3474a6e623afc092a909575cfe4f3f7124fa3d;hb=d2f29611d1379a249c8f3f955ed16a336f9290cd;hpb=a96477bb5e1623dc132d632ac51a22cf7bdabfa7

diff --git a/pandora/emu.c b/pandora/emu.c
index af3474a..4a628c7 100644
--- a/pandora/emu.c
+++ b/pandora/emu.c
@@ -4,112 +4,38 @@
 // For commercial use, separate licencing terms must be obtained.
 
 #include <stdio.h>
-#include <stdlib.h>
-#include <sys/time.h>
-#include <stdarg.h>
 
-#include "../common/arm_utils.h"
-#include "../common/fonts.h"
 #include "../common/emu.h"
 #include "../common/menu.h"
-#include "../common/config.h"
-#include "../common/input.h"
+#include "../common/plat.h"
+#include "../common/arm_utils.h"
 #include "../linux/sndout_oss.h"
 #include "asm_utils.h"
+#include "version.h"
 
 #include <pico/pico_int.h>
-#include <pico/patch.h>
-#include <pico/sound/mix.h>
-#include <zlib/zlib.h>
-
-//#define PFRAMES
-#define BENCHMARK
-//#define USE_320_SCREEN 1
 
-#ifdef BENCHMARK
-#define OSD_FPS_X (800-200)
-#else
-#define OSD_FPS_X (800-120)
-#endif
+#define USE_320_SCREEN 1
 
 
 static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
+static unsigned char temp_frame[g_screen_width * g_screen_height * 2];
+unsigned char *PicoDraw2FB = temp_frame;
 static int osd_fps_x;
-unsigned char *PicoDraw2FB = NULL;  // temporary buffer for alt renderer
-
-#define PICO_PEN_ADJUST_X 4
-#define PICO_PEN_ADJUST_Y 2
-static int pico_pen_x = 0, pico_pen_y = 240/2;
-
-
-int plat_get_root_dir(char *dst, int len)
-{
-	extern char **g_argv;
-	int j;
+char cpu_clk_name[] = "unused";
 
-	strncpy(dst, g_argv[0], len);
-	len -= 32; // reserve
-	if (len < 0) len = 0;
-	dst[len] = 0;
-	for (j = strlen(dst); j > 0; j--)
-		if (dst[j] == '/') { dst[j+1] = 0; break; }
-
-	return j + 1;
-}
 
 void pemu_prep_defconfig(void)
 {
-	memset(&defaultConfig, 0, sizeof(defaultConfig));
-	defaultConfig.EmuOpt    = 0x8f | 0x00600; // | <- confirm_save, cd_leds
-	defaultConfig.s_PicoOpt  = 0x0f | POPT_EXT_FM|POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_SVP_DRC;
-	defaultConfig.s_PicoOpt |= POPT_ACC_SPRITES|POPT_EN_MCD_GFX;
-	defaultConfig.EmuOpt    &= ~8; // no save gzip
-	defaultConfig.s_PsndRate = 44100;
-	defaultConfig.s_PicoRegion = 0;
-	defaultConfig.s_PicoAutoRgnOrder = 0x184; // US, EU, JP
-	defaultConfig.s_PicoCDBuffers = 0;
-	defaultConfig.Frameskip = 0;
-	defaultConfig.CPUclock = 200;
-	defaultConfig.volume = 50;
-	defaultConfig.scaling = 0;
-	defaultConfig.turbo_rate = 15;
+	// XXX: move elsewhere
+	g_menubg_ptr = temp_frame;
 }
 
-static void textOut16(int x, int y, const char *text)
+void pemu_validate_config(void)
 {
-	int i,l,len=strlen(text);
-	unsigned int *screen = (unsigned int *)((unsigned short *)g_screen_ptr + (x&~1) + y*g_screen_width);
-
-	for (i = 0; i < len; i++)
-	{
-		for (l=0;l<16;)
-		{
-			unsigned char fd = fontdata8x8[((text[i])*8)+l/2];
-			unsigned int *d = &screen[l*g_screen_width/2];
-			if (fd&0x80) d[0]=0xffffffff;
-			if (fd&0x40) d[1]=0xffffffff;
-			if (fd&0x20) d[2]=0xffffffff;
-			if (fd&0x10) d[3]=0xffffffff;
-			if (fd&0x08) d[4]=0xffffffff;
-			if (fd&0x04) d[5]=0xffffffff;
-			if (fd&0x02) d[6]=0xffffffff;
-			if (fd&0x01) d[7]=0xffffffff;
-			l++; d = &screen[l*g_screen_width/2];
-			if (fd&0x80) d[0]=0xffffffff;
-			if (fd&0x40) d[1]=0xffffffff;
-			if (fd&0x20) d[2]=0xffffffff;
-			if (fd&0x10) d[3]=0xffffffff;
-			if (fd&0x08) d[4]=0xffffffff;
-			if (fd&0x04) d[5]=0xffffffff;
-			if (fd&0x02) d[6]=0xffffffff;
-			if (fd&0x01) d[7]=0xffffffff;
-			l++;
-		}
-		screen += 8;
-	}
 }
 
-
+// FIXME: cleanup
 static void osd_text(int x, int y, const char *text)
 {
 	int len = strlen(text)*8;
@@ -163,25 +89,6 @@ static void draw_cd_leds(void)
 	}
 }
 
-static void draw_pico_ptr(void)
-{
-	unsigned short *p = (unsigned short *)g_screen_ptr;
-
-	// only if pen enabled and for 16bit modes
-	if (pico_inp_mode == 0 || (PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) return;
-
-	if (!(Pico.video.reg[12]&1) && !(PicoOpt&POPT_DIS_32C_BORDER))
-		p += 32;
-
-	p += g_screen_width * (pico_pen_y + PICO_PEN_ADJUST_Y);
-	p += pico_pen_x + PICO_PEN_ADJUST_X;
-	p[0]   ^= 0xffff;
-	p[319] ^= 0xffff;
-	p[320] ^= 0xffff;
-	p[321] ^= 0xffff;
-	p[640] ^= 0xffff;
-}
-
 #ifdef USE_320_SCREEN
 
 static int EmuScanBegin16(unsigned int num)
@@ -236,188 +143,78 @@ static int EmuScanEnd16(unsigned int num)
 
 #endif // USE_320_SCREEN
 
-int localPal[0x100];
-static void (*vidCpyM2)(void *dest, void *src) = NULL;
-
-static void blit(const char *fps, const char *notice)
+void pemu_update_display(const char *fps, const char *notice)
 {
-	int emu_opt = currentConfig.EmuOpt;
-
-	if (PicoOpt&0x10)
-	{
-		// 8bit fast renderer
-		if (Pico.m.dirtyPal) {
-			Pico.m.dirtyPal = 0;
-			vidConvCpyRGB32(localPal, Pico.cram, 0x40);
-			// feed new palette to our device
-			// gp2x_video_setpalette(localPal, 0x40);
-		}
-		// a hack for VR
-		if (PicoAHW & PAHW_SVP)
-			memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
-		// do actual copy
-		vidCpyM2((unsigned char *)g_screen_ptr+g_screen_width*8, PicoDraw2FB+328*8);
-	}
-	else if (!(emu_opt&0x80))
-	{
-		// 8bit accurate renderer
-		if (Pico.m.dirtyPal)
-		{
-			int pallen = 0xc0;
-			Pico.m.dirtyPal = 0;
-			if (Pico.video.reg[0xC]&8) // shadow/hilight mode
-			{
-				vidConvCpyRGB32(localPal, Pico.cram, 0x40);
-				vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
-				vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40);
-				memcpy32(localPal+0xc0, localPal+0x40, 0x40);
-				pallen = 0x100;
-			}
-			else if (rendstatus & PDRAW_SONIC_MODE) { // mid-frame palette changes
-				vidConvCpyRGB32(localPal, Pico.cram, 0x40);
-				vidConvCpyRGB32(localPal+0x40, HighPal, 0x40);
-				vidConvCpyRGB32(localPal+0x80, HighPal+0x40, 0x40);
-				pallen = 0xc0;
-			}
-			else {
-				vidConvCpyRGB32(localPal, Pico.cram, 0x40);
-				memcpy32(localPal+0x80, localPal, 0x40);
-			}
-			if (pallen > 0xc0) {
-				localPal[0xc0] = 0x0000c000;
-				localPal[0xd0] = 0x00c00000;
-				localPal[0xe0] = 0x00000000; // reserved pixels for OSD
-				localPal[0xf0] = 0x00ffffff;
-			}
-			// gp2x_video_setpalette(localPal, pallen);
-		}
+	if (notice || (currentConfig.EmuOpt & EOPT_SHOW_FPS)) {
+		if (notice)
+			osd_text(4, 460, notice);
+		if (currentConfig.EmuOpt & EOPT_SHOW_FPS)
+			osd_text(osd_fps_x, 460, fps);
 	}
-
-	if (notice || (emu_opt & 2)) {
-		int h = g_screen_height-16;
-		if (currentConfig.scaling == 2 && !(Pico.video.reg[1]&8)) h -= 16;
-		if (notice) osd_text(4, h, notice);
-		if (emu_opt & 2)
-			osd_text(osd_fps_x, h, fps);
-	}
-	if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
+	if ((PicoAHW & PAHW_MCD) && (currentConfig.EmuOpt & EOPT_EN_CD_LEDS))
 		draw_cd_leds();
-	if (PicoAHW & PAHW_PICO)
-		draw_pico_ptr();
+}
 
-	//gp2x_video_wait_vsync();
-	// gp2x_video_flip();
+void plat_video_toggle_renderer(int is_next, int force_16bpp, int is_menu)
+{
+	// this will auto-select SMS/32X renderers
+	PicoDrawSetColorFormat(1);
 }
 
+void plat_video_menu_enter(int is_rom_loaded)
+{
+}
 
-// clears whole screen or just the notice area (in all buffers)
-static void clearArea(int full)
+void plat_video_menu_begin(void)
 {
-	if (full) memset(g_screen_ptr, 0, g_screen_width*g_screen_height*2);
-	else      memset((short *)g_screen_ptr + g_screen_width * (g_screen_height - 16), 0,
-			g_screen_width * 16 * 2);
+	memcpy32(g_screen_ptr, g_menubg_ptr, g_screen_width * g_screen_height * 2 / 4);
 }
 
+void plat_video_menu_end(void)
+{
+}
 
-static void vidResetMode(void)
+void plat_status_msg_clear(void)
 {
-#if 0
-	if (PicoOpt&0x10) {
-		gp2x_video_changemode(8);
-	} else if (currentConfig.EmuOpt&0x80) {
-		gp2x_video_changemode(16);
-#ifdef USE_320_SCREEN
-		PicoDrawSetColorFormat(1);
-		PicoScanBegin = EmuScanBegin16;
-#else
-		PicoDrawSetColorFormat(-1);
-		PicoScanEnd = EmuScanEnd16;
-#endif
-	} else {
-		gp2x_video_changemode(8);
-		PicoDrawSetColorFormat(2);
-		PicoScanBegin = EmuScanBegin8;
-	}
-	if ((PicoOpt&0x10)||!(currentConfig.EmuOpt&0x80)) {
-		// setup pal for 8-bit modes
-		localPal[0xc0] = 0x0000c000; // MCD LEDs
-		localPal[0xd0] = 0x00c00000;
-		localPal[0xe0] = 0x00000000; // reserved pixels for OSD
-		localPal[0xf0] = 0x00ffffff;
-		gp2x_video_setpalette(localPal, 0x100);
-		gp2x_memset_all_buffers(0, 0xe0, 320*240);
-		gp2x_video_flip();
-	}
-	Pico.m.dirtyPal = 1;
-	// reset scaling
-	if (currentConfig.scaling == 2 && !(Pico.video.reg[1]&8))
-	     gp2x_video_RGB_setscaling(8, (PicoOpt&0x100)&&!(Pico.video.reg[12]&1) ? 256 : 320, 224);
-	else gp2x_video_RGB_setscaling(0, (PicoOpt&0x100)&&!(Pico.video.reg[12]&1) ? 256 : 320, 240);
-#else
-#ifdef USE_320_SCREEN
-	PicoDrawSetColorFormat(1);
-	PicoScanBegin = EmuScanBegin16;
-#else
-	PicoDrawSetColorFormat(-1);
-	PicoScanEnd = EmuScanEnd16;
-#endif
-#endif
+	unsigned short *d = (unsigned short *)g_screen_ptr + g_screen_width * g_screen_height;
+	int l = g_screen_width * 8;
+	memset32((int *)(d - l), 0, l * 2 / 4);
 }
 
+void plat_status_msg_busy_next(const char *msg)
+{
+	plat_status_msg_clear();
+	pemu_update_display("", msg);
+	emu_status_msg("");
+	reset_timing = 1;
+}
 
-static void update_volume(int has_changed, int is_up)
+void plat_status_msg_busy_first(const char *msg)
+{
+//	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
+	plat_status_msg_busy_next(msg);
+}
+
+void plat_update_volume(int has_changed, int is_up)
 {
 	static int prev_frame = 0, wait_frames = 0;
 	int vol = currentConfig.volume;
 
 	if (has_changed)
 	{
-		if (vol < 5 && (PicoOpt&8) && prev_frame == Pico.m.frame_count - 1 && wait_frames < 12)
-			wait_frames++;
-		else {
-			if (is_up) {
-				if (vol < 99) vol++;
-			} else {
-				if (vol >  0) vol--;
-			}
-			wait_frames = 0;
-			sndout_oss_setvol(vol, vol);
-			currentConfig.volume = vol;
+		if (is_up) {
+			if (vol < 99) vol++;
+		} else {
+			if (vol >  0) vol--;
 		}
-		sprintf(noticeMsg, "VOL: %02i", vol);
-		gettimeofday(&noticeMsgTime, 0);
+		wait_frames = 0;
+		sndout_oss_setvol(vol, vol);
+		currentConfig.volume = vol;
+		emu_status_msg("VOL: %02i", vol);
 		prev_frame = Pico.m.frame_count;
 	}
-
-	// set the right mixer func
-	if (!(PicoOpt&8)) return; // just use defaults for mono
-	if (vol >= 5)
-		PsndMix_32_to_16l = mix_32_to_16l_stereo;
-	else {
-		mix_32_to_16l_level = 5 - vol;
-		PsndMix_32_to_16l = mix_32_to_16l_stereo_lvl;
-	}
-}
-
-
-static void updateSound(int len)
-{
-	if (PicoOpt&8) len<<=1;
-
-	/* avoid writing audio when lagging behind to prevent audio lag */
-	if (PicoSkipFrame != 2)
-		sndout_oss_write(PsndOut, len<<1);
 }
 
-
-static void SkipFrame(int do_audio)
-{
-	PicoSkipFrame=do_audio ? 1 : 2;
-	PicoFrame();
-	PicoSkipFrame=0;
-}
-
-
 void pemu_forced_frame(int opts)
 {
 	int po_old = PicoOpt;
@@ -427,7 +224,6 @@ void pemu_forced_frame(int opts)
 	PicoOpt |= opts|POPT_ACC_SPRITES; // acc_sprites
 	currentConfig.EmuOpt |= 0x80;
 
-	//vidResetMode();
 #ifdef USE_320_SCREEN
 	PicoDrawSetColorFormat(1);
 	PicoScanBegin = EmuScanBegin16;
@@ -438,38 +234,22 @@ void pemu_forced_frame(int opts)
 	Pico.m.dirtyPal = 1;
 	PicoFrameDrawOnly();
 
-/*
-	if (!(Pico.video.reg[12]&1)) {
-		vidCpyM2 = vidCpyM2_32col;
-		clearArea(1);
-	} else	vidCpyM2 = vidCpyM2_40col;
-
-	vidCpyM2((unsigned char *)g_screen_ptr+g_screen_width*8, PicoDraw2FB+328*8);
-	vidConvCpyRGB32(localPal, Pico.cram, 0x40);
-	gp2x_video_setpalette(localPal, 0x40);
-*/
 	PicoOpt = po_old;
 	currentConfig.EmuOpt = eo_old;
 }
 
-void plat_debug_cat(char *str)
-{
-}
-
-static void simpleWait(int thissec, int lim_time)
+static void updateSound(int len)
 {
-	struct timeval tval;
+	len <<= 1;
+	if (PicoOpt & POPT_EN_STEREO)
+		len <<= 1;
 
-	spend_cycles(1024);
-	gettimeofday(&tval, 0);
-	if (thissec != tval.tv_sec) tval.tv_usec+=1000000;
+	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))
+		return;
 
-	while (tval.tv_usec < lim_time)
-	{
-		spend_cycles(1024);
-		gettimeofday(&tval, 0);
-		if (thissec != tval.tv_sec) tval.tv_usec+=1000000;
-	}
+	/* avoid writing audio when lagging behind to prevent audio lag */
+	if (PicoSkipFrame != 2)
+		sndout_oss_write(PsndOut, len);
 }
 
 void pemu_sound_start(void)
@@ -491,7 +271,7 @@ void pemu_sound_start(void)
 		sndout_oss_start(PsndRate, 16, (PicoOpt&8)>>3);
 		sndout_oss_setvol(currentConfig.volume, currentConfig.volume);
 		PicoWriteSound = updateSound;
-		update_volume(0, 0);
+		plat_update_volume(0, 0);
 		memset(sndBuffer, 0, sizeof(sndBuffer));
 		PsndOut = sndBuffer;
 		PsndRate_old = PsndRate;
@@ -509,224 +289,89 @@ void pemu_sound_wait(void)
 	// don't need to do anything, writes will block by themselves
 }
 
-void pemu_loop(void)
+void plat_debug_cat(char *str)
 {
-	char fpsbuff[24]; // fps count c string
-	struct timeval tval; // timing
-	int pframes_done, pframes_shown, pthissec; // "period" frames, used for sync
-	int  frames_done,  frames_shown,  thissec; // actual frames
-	int oldmodes = 0, target_fps, target_frametime, lim_time, vsync_offset, i;
-	char *notice = 0;
-
-	printf("entered emu_Loop()\n");
-
-	fpsbuff[0] = 0;
-
-	// make sure we are in correct mode
-	vidResetMode();
-	Pico.m.dirtyPal = 1;
-	oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
-
-	// pal/ntsc might have changed, reset related stuff
-	target_fps = Pico.m.pal ? 50 : 60;
-	target_frametime = 1000000/target_fps;
-	reset_timing = 1;
-
-	pemu_sound_start();
-
-	// prepare CD buffer
-	if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
-
-	// calc vsync offset to sync timing code with vsync
-	if (currentConfig.EmuOpt&0x2000) {
-		gettimeofday(&tval, 0);
-		//gp2x_video_wait_vsync();
-		gettimeofday(&tval, 0);
-		vsync_offset = tval.tv_usec;
-		while (vsync_offset >= target_frametime)
-			vsync_offset -= target_frametime;
-		if (!vsync_offset) vsync_offset++;
-		printf("vsync_offset: %i\n", vsync_offset);
-	} else
-		vsync_offset = 0;
-
-	frames_done = frames_shown = thissec =
-	pframes_done = pframes_shown = pthissec = 0;
-
-	// loop
-	while (engineState == PGS_Running)
-	{
-		int modes;
-
-		gettimeofday(&tval, 0);
-		if (reset_timing) {
-			reset_timing = 0;
-			pthissec = tval.tv_sec;
-			pframes_shown = pframes_done = tval.tv_usec/target_frametime;
-		}
+}
 
-		// show notice message?
-		if (noticeMsgTime.tv_sec)
-		{
-			static int noticeMsgSum;
-			if((tval.tv_sec*1000000+tval.tv_usec) - (noticeMsgTime.tv_sec*1000000+noticeMsgTime.tv_usec) > 2000000) { // > 2.0 sec
-				noticeMsgTime.tv_sec = noticeMsgTime.tv_usec = 0;
-				clearArea(0);
-				notice = 0;
-			} else {
-				int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
-				if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
-				notice = noticeMsg;
-			}
-		}
+void emu_video_mode_change(int start_line, int line_count, int is_32cols)
+{
+	osd_fps_x = 260;
 
-		// check for mode changes
-		modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
-		if (modes != oldmodes)
-		{
-			int scalex = g_screen_width;
-			osd_fps_x = OSD_FPS_X;
-			if (modes & 4) {
-				vidCpyM2 = vidCpyM2_40col;
-			} else {
-				if (PicoOpt & 0x100) {
-					vidCpyM2 = vidCpyM2_32col_nobord;
-					scalex = 256;
-					osd_fps_x = OSD_FPS_X - 64;
-				} else {
-					vidCpyM2 = vidCpyM2_32col;
-				}
-			}
-			//if (currentConfig.scaling == 2 && !(modes&8)) // want vertical scaling and game is not in 240 line mode
-			//      gp2x_video_RGB_setscaling(8, scalex, 224);
-			// else gp2x_video_RGB_setscaling(0, scalex, 240);
-			oldmodes = modes;
-			clearArea(1);
-		}
+	// clear whole screen in all buffers
+	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
+}
 
-		// second changed?
-		if (thissec != tval.tv_sec)
-		{
-#ifdef BENCHMARK
-			static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
-			if (++bench == 4) {
-				bench = 0;
-				bench_fps_s = bench_fps / 4;
-				bf[bfp++ & 3] = bench_fps / 4;
-				bench_fps = 0;
-			}
-			bench_fps += frames_shown;
-			sprintf(fpsbuff, "%3i/%3i/%3i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
-			printf("%s\n", fpsbuff);
+void pemu_loop_prep(void)
+{
+#ifdef USE_320_SCREEN
+	PicoDrawSetColorFormat(1);
+	PicoScanBegin = EmuScanBegin16;
 #else
-			if (currentConfig.EmuOpt & 2) {
-				sprintf(fpsbuff, "%3i/%3i", frames_shown, frames_done);
-				if (fpsbuff[5] == 0) { fpsbuff[5] = fpsbuff[6] = ' '; fpsbuff[7] = 0; }
-			}
-#endif
-			frames_shown = frames_done = 0;
-			thissec = tval.tv_sec;
-		}
-#ifdef PFRAMES
-		sprintf(fpsbuff, "%i", Pico.m.frame_count);
+	PicoDrawSetColorFormat(-1);
+	PicoScanEnd = EmuScanEnd16;
 #endif
 
-		if (pthissec != tval.tv_sec)
-		{
-			if (PsndOut == 0 && currentConfig.Frameskip >= 0) {
-				pframes_done = pframes_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 && pframes_done < target_fps && pframes_done > target_fps-5) {
-					emu_update_input();
-					SkipFrame(1); pframes_done++;
-				}
-
-				pframes_done  -= target_fps; if (pframes_done  < 0) pframes_done  = 0;
-				pframes_shown -= target_fps; if (pframes_shown < 0) pframes_shown = 0;
-				if (pframes_shown > pframes_done) pframes_shown = pframes_done;
-			}
-			pthissec = tval.tv_sec;
-		}
+	pemu_sound_start();
+}
 
-		lim_time = (pframes_done+1) * target_frametime + vsync_offset;
-		if (currentConfig.Frameskip >= 0) // frameskip enabled
-		{
-			for(i = 0; i < currentConfig.Frameskip; i++) {
-				emu_update_input();
-				SkipFrame(1); pframes_done++; frames_done++;
-				if (PsndOut && !reset_timing) { // do framelimitting if sound is enabled
-					gettimeofday(&tval, 0);
-					if (pthissec != tval.tv_sec) tval.tv_usec+=1000000;
-					if (tval.tv_usec < lim_time) { // we are too fast
-						simpleWait(pthissec, lim_time);
-					}
-				}
-				lim_time += target_frametime;
-			}
-		}
-		else if (tval.tv_usec > lim_time) // auto frameskip
-		{
-			// no time left for this frame - skip
-			if (tval.tv_usec - lim_time >= 300000) {
-				/* something caused a slowdown for us (disk access? cache flush?)
-				 * try to recover by resetting timing... */
-				reset_timing = 1;
-				continue;
-			}
-			emu_update_input();
-			SkipFrame(tval.tv_usec < lim_time+target_frametime*2); pframes_done++; frames_done++;
-			continue;
-		}
+void pemu_loop_end(void)
+{
+	int po_old = PicoOpt;
+	int eo_old = currentConfig.EmuOpt;
 
-		emu_update_input();
-		PicoFrame();
+	pemu_sound_stop();
+	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
 
-		// check time
-		gettimeofday(&tval, 0);
-		if (pthissec != tval.tv_sec) tval.tv_usec+=1000000;
+	/* do one more frame for menu bg */
+	PicoOpt &= ~POPT_ALT_RENDERER;
+	PicoOpt |= POPT_EN_SOFTSCALE|POPT_ACC_SPRITES;
+	currentConfig.EmuOpt |= EOPT_16BPP;
 
-		if (currentConfig.Frameskip < 0 && tval.tv_usec - lim_time >= 300000) // slowdown detection
-			reset_timing = 1;
-#if 1
-		else if (PsndOut != NULL || currentConfig.Frameskip < 0)
-		{
-			// sleep or vsync if we are still too fast
-			// usleep sleeps for ~20ms minimum, so it is not a solution here
-			if (!reset_timing && tval.tv_usec < lim_time)
-			{
-				// we are too fast
-				if (vsync_offset) {
-					if (lim_time - tval.tv_usec > target_frametime/2)
-						simpleWait(pthissec, lim_time - target_frametime/4);
-					// gp2x_video_wait_vsync();
-				} else {
-					simpleWait(pthissec, lim_time);
-				}
-			}
-		}
-#endif
-		blit(fpsbuff, notice);
+	PicoDrawSetColorFormat(1);
+	Pico.m.dirtyPal = 1;
+	PicoFrame();
 
-		pframes_done++; pframes_shown++;
-		 frames_done++;  frames_shown++;
-	}
+	PicoOpt = po_old;
+	currentConfig.EmuOpt = eo_old;
+}
 
-	emu_set_fastforward(0);
+/* XXX: avoid busy wait somehow? */
+void plat_wait_till_us(unsigned int us_to)
+{
+	unsigned int now;
 
-	if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
+	spend_cycles(1024);
+	now = plat_get_ticks_us();
 
-	// save SRAM
-	if ((currentConfig.EmuOpt & EOPT_EN_SRAM) && SRam.changed) {
-		/* FIXME: plat_status_msg_busy_first */
-		emu_state_cb("Writing SRAM/BRAM..");
-		emu_save_load_game(0, 1);
-		SRam.changed = 0;
+	while ((signed int)(us_to - now) > 512)
+	{
+		spend_cycles(1024);
+		now = plat_get_ticks_us();
 	}
+}
 
-	// if in 8bit mode, generate 16bit image for menu background
-	if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80))
-		pemu_forced_frame(POPT_EN_SOFTSCALE);
+void plat_video_wait_vsync(void)
+{
 }
 
+const char *plat_get_credits(void)
+{
+	return "PicoDrive v" VERSION " (c) notaz, 2006-2009\n\n\n"
+		"Credits:\n"
+		"fDave: Cyclone 68000 core,\n"
+		"      base code of PicoDrive\n"
+		"Reesy & FluBBa: DrZ80 core\n"
+		"MAME devs: YM2612 and SN76496 cores\n"
+		"rlyeh and others: minimal SDK\n"
+		"Squidge: mmuhack\n"
+		"Dzz: ARM940 sample\n"
+		"GnoStiC / Puck2099: USB joy code\n"
+		"craigix: GP2X hardware\n"
+		"ketchupgun: skin design\n"
+		"\n"
+		"special thanks (for docs, ideas):\n"
+		" Charles MacDonald, Haze,\n"
+		" Stephane Dallongeville,\n"
+		" Lordus, Exophase, Rokas,\n"
+		" Nemesis, Tasco Deluxe";
+}