shithub: sms

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Start implementing the vdp background

--- a/vdp.c

+++ b/vdp.c

@@ -51,15 +51,31 @@

 static void

 planes(void)

 {

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

-}

+	if (vdpy > 192) return;

-static struct sprite {

-	uint16_t y, x;

-	uint8_t w, h;

-	uint16_t t;

-	uint32_t c[4];

-} spr[21], *lsp;

+	int y = vdpy >> 3;

+

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

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

+		int tidx = vram[taddr];

+		int tdataaddr = tidx << 5;

+

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

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

+

+			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;

+

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

+		}

+	}

+}

 int sprlst[64] = {-1};

-- 

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