shithub: sms

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Fix viewport

--- a/sms.c

+++ b/sms.c

@@ -89,7 +89,7 @@

 	if(argc < 1)

 		usage();

 	loadrom(*argv);

-	initemu(320, 224, 4, XRGB32, 1, nil);

+	initemu(256, 224, 4, XRGB32, 1, nil);

 	regkey("a", 'c', 1<<4);

 	regkey("b", 'x', 1<<5);

 	regkey("start", '\n', 1<<6);

--- a/vdp.c

+++ b/vdp.c

@@ -13,7 +13,7 @@

 int vdpx = 0, vdpyy, frame, intla;

 int first = 1;

 u16int hctr;

-static int xmax, xdisp;

+static int xmax, xdisp, ydisp;

 enum { ymax = 262, yvbl = 234 };

 int vdpy = ymax-1;

 static u8int scrollx;

@@ -24,6 +24,7 @@

 {

 	xmax = 320;

 	xdisp = 256;

+	ydisp = 224;

 }

 static void

@@ -32,7 +33,9 @@

 	u32int *p;

 	union { u32int l; u8int b[4]; } u;

-	p = (u32int *)pic + (x + y * 320);

+	if(x < 0 || x >= xdisp || y < 0 || y >= ydisp)

+		return;

+	p = (u32int *)pic + (x + y * xdisp);

 	u.b[0] = v >> 16;

 	u.b[1] = v >> 8;

 	u.b[2] = v;

@@ -253,14 +256,15 @@

 			scrolly = reg[VERSCR];

 	}

-	if(vdpx < 320 && vdpy < disph)

-		if(vdpx < xdisp){

+	if(vdpx < xdisp && vdpy < ydisp){

+		if(vdpy < disph){

 			int c = (reg[BGCOL] & 0x0f) + 16;

 			pixeldraw(vdpx, vdpy, cramc[c]);

 			planes();

 			sprites();

 		}else

-			pixeldraw(vdpx, vdpy, cramc[(reg[BGCOL] & 0x0f) + 16]);

+			pixeldraw(vdpx, vdpy, 0);

+	}

 	if(++vdpx >= xmax){

 		z80irq = 0;

 		vdpx = 0;

-- 

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