X-Git-Url: http://4ch.mooo.com/gitweb/?a=blobdiff_plain;f=asmyt.c;h=d8447479a20927cf9c9ae4603dbfb9997d9c9827;hb=646d04f51c8fd06e93b6517334bcac1e9b7157f2;hp=a615e54d26c5885a41e70bf5e1465b82278c19fb;hpb=415e8c10d612e89c1cd6a63ad1293e34f8e47547;p=plz.git

diff --git a/asmyt.c b/asmyt.c
index a615e54..d844747 100755
--- a/asmyt.c
+++ b/asmyt.c
@@ -1,33 +1,127 @@
-#include "asmyt.h"
-// __asm{
-// PUBLIC C plzline, C setplzparas, C psini, C lsini4, C lsini16
-//
-// LABEL psini BYTE
-// INCLUDE 'psini.inc'
-// ;       db      16384 dup(?)
-//
-// LABEL lsini4 WORD
-// INCLUDE 'lsini4.inc'
-// ;       db      16384 dup(?)
-//
-// LABEL lsini16 WORD
-// INCLUDE 'lsini16.inc'
-// ;       db      16384 dup(?)
-// }
-
-void set_plzstart(word start)
-{
-__asm{
-	mov	dx, 3d4h
-	mov	al, 18h		; linecompare
-	mov	ah, [Byte start]
-	out	dx, ax
-	mov	al, 07h
-	mov	ah, [Byte start+1]
-	shl	ah, 4d
-	and	ah, 10h
-	or	ah, 0fh
-	out	dx, ax			; 8th bit
-}
-	return start;
-}
+/*
+ * Written by Nick Kovac with minor changes by Claudio Matsuoka
+ */
+
+#include "common.h"
+
+static uint16_t selfmod[5][84];
+extern char *psini;
+
+#define PSINI_OFFSET	0
+#define LSINI4_OFFSET	16384
+#define LSINI16_OFFSET	(16384 + 2 * 8192)
+
+
+int plzline(int y, int vseg)
+{
+	// vseg represented a segment, so multiply by sixteen (shift left by 4)
+	// to convert into an offset.
+	int nVgaYOffset = vseg << 4;
+
+	int cccTable[] = {
+		3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12, 19, 18,
+		17, 16, 23, 22, 21, 20, 27, 26, 25, 24, 31, 30, 29, 28, 35,
+		34, 33, 32, 39, 38, 37, 36, 43, 42, 41, 40, 47, 46, 45, 44,
+		51, 50, 49, 48, 55, 54, 53, 52, 59, 58, 57, 56, 63, 62, 61,
+		60, 67, 66, 65, 64, 71, 70, 69, 68, 75, 74, 73, 72, 79, 78,
+		77, 76, 83, 82, 81, 80
+	};
+	uint8_t ah = 0;
+	uint8_t al = 0;
+	uint16_t eax = 0;
+	int i;
+
+	for (i = 0; i < 84; i++) {
+		int ccc = cccTable[i];
+		uint16_t offs;
+		int bx;
+
+		if ((ccc & 1) == 1) {
+			// within lsini16
+			offs = (y * 2) + selfmod[2][ccc];
+			bx = *(short *)&psini[offs];
+
+			// within psini
+			offs = bx + selfmod[1][ccc];
+			ah = psini[offs];
+
+			// within lsini4
+			offs = (y * 2) + selfmod[4][ccc];
+			bx = *(short *)&psini[offs];
+
+			// within psini
+			offs = bx + (y * 2) + selfmod[3][ccc];
+			ah += psini[offs];
+		} else {
+			offs = (y * 2) + selfmod[2][ccc];
+			bx = *(short *)&psini[offs];
+
+			offs = bx + selfmod[1][ccc];
+			al = psini[offs];
+
+			offs = (y * 2) + selfmod[4][ccc];
+			bx = *(short *)&psini[offs];
+
+			offs = bx + (y * 2) + selfmod[3][ccc];
+			al += psini[offs];
+		}
+
+		if ((ccc & 3) == 2) {
+			eax = (ah << 8) | al;
+			eax <<= 8;
+		}
+
+		if ((ccc & 3) == 0) {
+			eax |= (ah << 8) | al;
+//			vga_write32(nVgaYOffset + ccc, eax);
+			__asm {
+				mov     [es:ccc], ax
+			}
+		}
+	}
+
+	return 0;
+}
+
+int setplzparas(int c1, int c2, int c3, int c4)
+{
+	int ccc;
+
+	for (ccc = 0; ccc < 84; ccc++) {
+		uint16_t lc1, lc2, lc3, lc4;
+
+		lc1 = c1 + PSINI_OFFSET + (ccc * 8);
+		selfmod[1][ccc] = lc1;
+
+		lc2 = (c2 * 2) + LSINI16_OFFSET - (ccc * 8) + (80 * 8);
+		selfmod[2][ccc] = lc2;
+
+		lc3 = c3 + PSINI_OFFSET - (ccc * 4) + (80 * 4);
+		selfmod[3][ccc] = lc3;
+
+		lc4 = (c4 * 2) + LSINI4_OFFSET + (ccc * 32);
+		selfmod[4][ccc] = lc4;
+	}
+
+	return 0;
+}
+
+word set_plzstart(word start)
+{
+__asm{
+	mov	dx, 3d4h
+	mov	al, 18h		; linecompare
+	mov	ah, [Byte PTR start]
+	out	dx, ax
+	mov	al, 07h
+	mov	ah, [Byte PTR start+1]
+	shl	ah, 1d
+	shl	ah, 1d
+	shl	ah, 1d
+	shl	ah, 1d
+	and	ah, 10h
+	or	ah, 0fh
+	out	dx, ax			; 8th bit
+}
+	return start;
+}