shithub: sms

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bg almost working

--- a/vdp.c

+++ b/vdp.c

@@ -43,12 +43,6 @@

 }

 static void

-plane(int n, int vis)

-{

-

-}

-

-static void

 planes(void)

 {

 	uint16_t screenmap = (reg[PANT] & 0x0e) << 10;

@@ -57,23 +51,24 @@

 	int y = vdpy >> 3;

-	for(int x = 0; x < 32; x++){

-		uint16_t taddr = screenmap + (((y << 5) + x) << 1);

+	for(int x = 0; x < 256; x++){

+		int tx = x >> 3;

+		int ty = y >> 3;

+		int txoff = x & 7;

+		int tyoff = vdpy & 7;

+		uint16_t taddr = screenmap + (((y << 5) + tx) << 1);

 		int tidx = vram[taddr];

-		int tdataaddr = tidx << 5;

+		int data = (tidx << 5) + (tyoff << 2);

+		int xx = 7 - txoff;

-		for (int xx = 0; xx < 8; xx++){

-			if (x*8+xx > 256) continue;

+		int c = ((vram[data] >> xx) & 1) +

+				(((vram[data + 1] >> xx) & 1) << 1) +

+				(((vram[data + 2] >> xx) & 1) << 2) +

+				(((vram[data + 3] >> xx) & 1) << 3);

-			int c = ((vram[tdataaddr] >> xx) & 0x01) +

-					(((vram[tdataaddr + 1] >> xx) & 0x01) << 1) +

-					(((vram[tdataaddr + 2] >> xx) & 0x01) << 2) +

-					(((vram[tdataaddr + 3] >> xx) & 0x01) << 3);

+		if (c == 0) continue;

-			if (c == 0) continue;

-

-			pixeldraw(x*8+xx, vdpy, cramc[c + 16]);

-		}

+		pixeldraw(x, vdpy, cramc[c + 16]);

 	}

 }

-- 

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