shithub: sms

ref: 96bb44290d4c7f3d6719cfcb877954c4cedc7976
dir: /sms.c/

#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <keyboard.h>
#include "../eui.h"
#include "dat.h"
#include "fns.h"

int t = 0;
u32int r[16];
extern u16int pc, curpc, sp;
u32int irq;
u8int *rom = nil;
u8int *mem = nil;
u8int *pic = nil;
int vdpclock = 0;
int psgclock = 0;

static void
loadrom(char *file)
{
	int fd;

	fd = open(file, OREAD);
	if(fd < 0)
		sysfatal("open: %r");

	pic = malloc(320 * 224 * 4);
	rom = malloc(0x40000);
	//memcpy(rom, data, 0x40000);
	if(readn(fd, rom, 0x40000) < 0x40000)
		sysfatal("read: %r");
	mem = malloc(0xC000+0x8000);
	memcpy(mem, rom, 0xC000);
	pc = 0;

	psginit(RATE, PSGCLOCK);
	vdpmode();
}

void
usage(void)
{
	fprint(2, "usage: %s [-a] [-x scale] rom\n", argv0);
	exits("usage");
}

void
process_inputs()
{
	/*for(int p = 0; p < 2; p++)
	{
		keys[p] = 0xff;
		for(int id = 0; id < RETRO_DEVICE_ID_JOYPAD_X; id++)
			if(input_state_cb(p, RETRO_DEVICE_JOYPAD, 0, id))
				keys[p] = keys[p] & ~retro_bind[id];
	}

	portDC = (keys[0] & 0x3f) + ((keys[1] << 6) & 0xc0);
	portDD = ((keys[1] >> 2) & 0x0f) | 0xf0;*/
}

void
threadmain(int argc, char **argv)
{
	int t;

	ARGBEGIN{
	case 'a':
		initaudio();
		break;
	case 'x':
		fixscale = strtol(EARGF(usage()), nil, 0);
		break;
	default:
		usage();
	} ARGEND;
	if(argc < 1)
		usage();
	loadrom(*argv);
	initemu(320, 224, 4, XRGB32, 1, nil);
	regkey("a", 'c', 1<<4);
	regkey("b", 'x', 1<<5);
	regkey("start", '\n', 1<<6);
	regkey("up", Kup, 0x0);
	regkey("down", Kdown, 1<<1);
	regkey("left", Kleft, 1<<2);
	regkey("right", Kright, 1<<3);
	z80reset();
	vdpmode();
	//ymreset();
	for(;;){
		//process_inputs();
		t = z80step();
		vdpclock -= t * Z80DIV;
		//total += t;

		while(vdpclock < 0){
			vdpstep();
			vdpclock += 8;
		}
		/*if(total > 702240){
			flush();
			total = 0;
			vdpx = 0;
			vdpy = 0;
		}*/
	}
}

void
flush(void)
{
	flushmouse(1);
	flushscreen();
	//flushaudio(audioout);
}