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games/md: interlacing, sort of

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This commit is contained in:
aiju 2014-11-22 19:40:36 +01:00
parent f55c43fe8d
commit 41ef4524ab
3 changed files with 40 additions and 13 deletions
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2
sys/src/games/md/dat.h
View file

@ -23,7 +23,7 @@ extern int keys, scale;
extern u16int vram[32768], vsram[40];
extern u32int cramc[64];
extern u16int vdpstat;
extern int vdpx, vdpy;
extern int vdpx, vdpy, frame, intla;
extern u8int ym[512], ymstat;

2
sys/src/games/md/mem.c
View file

@ -180,6 +180,8 @@ memread(u32int a)
v = vdpx - (vdpx >= 360 ? 406 : 0);
else
v = vdpx - (vdpx >= 296 ? 342 : 0);
if(intla)
return vdpy - (vdpy >= 234 ? 5 : 0) << 8 & 0xfe00 | frame << 8 | v >> 1 & 0xff;
return vdpy - (vdpy >= 234 ? 5 : 0) << 8 | v >> 1 & 0xff;
default:
goto invalid;

49
sys/src/games/md/vdp.c
View file

@ -6,11 +6,12 @@
u8int pic[320*224*4*3];
u16int vdpstat = 0x3400;
int vdpx, vdpy;
int vdpx, vdpy, vdpyy, frame, intla;
u16int hctr;
static int xmax, xdisp, ymax = 262, yvbl = 234;
static int xmax, xdisp;
static int sx, snx, col, pri, lum;
enum { DARK, NORM, BRIGHT };
enum { ymax = 262, yvbl = 234 };
void
vdpmode(void)
@ -22,6 +23,7 @@ vdpmode(void)
xdisp = 256;
xmax = 342;
}
intla = (reg[MODE4] & 6) == 6;
}
static void
@ -43,6 +45,8 @@ pixeldraw(int x, int y, int v)
u.b[2] = v;
u.b[3] = 0;
if(scale == 2){
if(intla)
y = y << 1 | frame;
q = (u32int*)pic + (x + y * 320) * 2;
q[0] = u.w;
q[1] = u.w;
@ -97,9 +101,15 @@ tile(struct pctxt *p)
a += p->tx;
p->t = vram[a];
y = p->tny;
if((p->t & 0x1000) != 0)
y = 7 - y;
a = (p->t & 0x7ff) << 4 | y << 1;
if(intla){
if((p->t & 0x1000) != 0)
y = 15 - y;
a = (p->t & 0x7ff) << 5 | y << 1;
}else{
if((p->t & 0x1000) != 0)
y = 7 - y;
a = (p->t & 0x7ff) << 4 | y << 1;
}
p->c = vram[a] << 16 | vram[a+1];
}
@ -129,9 +139,15 @@ planeinit(void)
v = -(vram[a + i] & 0x3ff);
p->tnx = v & 7;
p->tx = v >> 3 & pctxt[i].w - 1;
v = vsram[i] + vdpy;
p->tny = v & 7;
p->ty = v >> 3 & pctxt[i].h - 1;
if(intla){
v = vsram[i] + vdpyy;
p->tny = v & 15;
p->ty = v >> 4 & pctxt[i].h - 1;
}else{
v = vsram[i] + vdpy;
p->tny = v & 7;
p->ty = v >> 3 & pctxt[i].h - 1;
}
tile(p);
if(p->tnx != 0)
if((p->t & 0x800) != 0)
@ -237,9 +253,15 @@ spritesinit(void)
np = 0;
nt = 0;
do{
q->y = (p[0] & 0x3ff) - 128;
q->h = (p[1] >> 8 & 3) + 1 << 3;
dy = vdpy - q->y;
if(intla){
q->y = (p[0] & 0x3ff) - 256;
q->h = (p[1] >> 8 & 3) + 1 << 4;
dy = vdpyy - q->y;
}else{
q->y = (p[0] & 0x3ff) - 128;
q->h = (p[1] >> 8 & 3) + 1 << 3;
dy = vdpy - q->y;
}
if(dy >= q->h)
continue;
q->t = p[2];
@ -249,7 +271,7 @@ spritesinit(void)
if(q->x == 0xff80)
break;
q->w = (p[1] >> 10 & 3) + 1 << 3;
c = ((q->t & 0x7ff) << 4) + (dy << 1);
c = ((q->t & 0x7ff) << 4+intla) + (dy << 1);
for(i = 0; i < q->w >> 3 && np < xdisp; i++){
v = vram[c] << 16 | vram[(u16int)(c+1)];
c += q->h << 1;
@ -354,6 +376,8 @@ vdpstep(void)
vdpstat &= ~(STATINT | STATVBL | STATOVR | STATCOLL);
flush();
}
if(intla)
vdpyy = vdpy << 1 | frame;
if(vdpy == 0 || vdpy >= 225)
hctr = reg[HORCTR];
else
@ -364,6 +388,7 @@ vdpstep(void)
}
if(vdpy == yvbl){
vdpstat |= STATVBL | STATINT;
frame ^= 1;
z80irq = 1;
if((reg[MODE2] & IE0) != 0)
irq |= INTVBL;