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HARD/DOLINE.C

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+// create code for line blitter
+
+#include <stdio.h>
+
+char *vram=(char *)0xa0000000L;
+
+FILE	*out;
+
+
+void	line(int x1,int y1,int x2,int y2)
+{
+	int	xd=x2-x1;
+	int	yd=y2-y1;
+	int	a,d,x,y;
+	memset(vram,0,16*320);
+	if(xd>yd) 
+	{
+		d=-xd/2;
+		while(x1<x2 || y1<y2)
+		{
+			vram[x1+y1*320]=2;
+			x1++;
+			d+=yd; 
+			if(d>0)
+			{
+				d-=xd;
+				y1++;
+			}
+		}
+	}
+	else 
+	{
+		d=-yd/2;
+		while(x1<x2 || y1<y2)
+		{
+			vram[x1+y1*320]=2;
+			y1++;
+			d+=xd;
+			if(d>0)
+			{
+				d-=yd;
+				x1++;
+			}
+		}
+	}
+	//vram[x2+y2*320]=1;
+	for(y=0;y<16;y++) for(x=0;x<16;x++) if(vram[x+y*320])
+	{
+		if(vram[x+y*320+1])
+		{
+			fprintf(out,"mov es:[di+%i],ax\n",x+y*320);
+			vram[x+y*320]=vram[x+y*320+1]=0;
+		}
+		else
+		{
+			fprintf(out,"mov es:[di+%i],al\n",x+y*320);
+			vram[x+y*320]=0;
+		}
+	}
+}
+
+main()
+{
+	int	x,y;
+	_asm mov ax,13h
+	_asm int 10h
+	out=fopen("lineblit.inc","wt");
+	fprintf(out,";LineBlitter core - created by doline.c\n");
+	fprintf(out,"lblt_table LABEL WORD\n");
+	for(x=0;x<16;x++)
+	{
+		for(y=0;y<16;y++)
+		{
+			fprintf(out,"dw OFFSET lblt_%i_%i\n",x,y);
+		}
+	}
+	for(x=0;x<16;x++)
+	{
+		for(y=0;y<16;y++)
+		{
+			fprintf(out,"lblt_%i_%i:\n",x,y);
+			line(0,0,x,y);
+			fprintf(out,"ret\n",x,y);
+		}
+	}
+	fclose(out);
+	_asm mov ax,3h
+	_asm int 10h
+}