105 lines
1.8 KiB
Text
105 lines
1.8 KiB
Text
// create code for line blitter
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#include <stdio.h>
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#include <string.h>
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char *vram=(char *)0xa0000000L;
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FILE *out;
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int isor;
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void line(int x1,int y1,int x2,int y2)
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{
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int xd=x2-x1;
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int yd=y2-y1;
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int a,d,x,y;
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memset(vram,0,16*320);
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if(xd>yd)
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{
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d=-xd/2;
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while(x1<x2 || y1<y2)
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{
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vram[x1+y1*320]=2;
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x1++;
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d+=yd;
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if(d>0)
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{
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d-=xd;
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y1++;
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}
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}
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}
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else
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{
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d=-yd/2;
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while(x1<x2 || y1<y2)
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{
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vram[x1+y1*320]=2;
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y1++;
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d+=xd;
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if(d>0)
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{
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d-=yd;
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x1++;
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}
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}
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}
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//vram[x2+y2*320]=1;
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for(y=0;y<16;y++) for(x=0;x<16;x++) if(vram[x+y*320])
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{
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if(vram[x+y*320+1])
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{
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fprintf(out,"mov ax,gs:[di+%i]\n",x+y*320);
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if(isor) fprintf(out,"or ax,dx\n");
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else fprintf(out,"xor ax,dx\n");
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fprintf(out,"mov gs:[di+%i],ax\n",x+y*320);
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fprintf(out,"mov es:[di+%i],ax\n",x+y*320);
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vram[x+y*320]=vram[x+y*320+1]=0;
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}
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else
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{
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fprintf(out,"mov al,gs:[di+%i]\n",x+y*320);
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if(isor) fprintf(out,"or al,dl\n");
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else fprintf(out,"xor al,dl\n");
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fprintf(out,"mov gs:[di+%i],al\n",x+y*320);
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fprintf(out,"mov es:[di+%i],al\n",x+y*320);
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vram[x+y*320]=0;
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}
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}
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}
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main()
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{
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int x,y;
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_asm mov ax,13h
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_asm int 10h
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out=fopen("lineblit.inc","wt");
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fprintf(out,";LineBlitter core - created by doline.c\n");
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fprintf(out,"lblt_table LABEL WORD\n");
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for(isor=0;isor>=0;isor--)
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{
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for(y=0;y<12;y++)
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{
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for(x=0;x<12;x++)
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{
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fprintf(out,"dw OFFSET lblt_%i%c%i\n",x,isor?'o':'a',y);
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}
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}
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}
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for(isor=0;isor>=0;isor--)
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{
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for(y=0;y<12;y++)
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{
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for(x=0;x<12;x++)
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{
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fprintf(out,"lblt_%i%c%i:\n",x,isor?'o':'a',y);
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line(0,0,x,y);
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fprintf(out,"ret\n",x,y);
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}
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}
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}
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fclose(out);
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_asm mov ax,3h
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_asm int 10h
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}
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