126 lines
2 KiB
C
126 lines
2 KiB
C
// 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+320*16+16;
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char *vram0=(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,xds;
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int yd,yds;
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int a,d,c,x,y;
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xd=x2-x1;
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if(xd<0)
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{
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xd=-xd;
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xds=-1;
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}
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else xds=1;
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yd=y2-y1;
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if(yd<0)
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{
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yd=-yd;
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yds=-1;
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}
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else yds=1;
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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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kbhit();
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vram[x1+y1*320]=2;
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x1+=xds;
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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+=yds;
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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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kbhit();
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vram[x1+y1*320]=2;
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y1+=yds;
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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+=xds;
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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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fprintf(out,"lblt_%ib%i:\n",x2&63,y2&63);
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for(y=-16;y<16;y++) for(x=-16;x<16;x++) if(vram[x+y*320]==2)
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{
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if(vram[x+y*320+1]==2)
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{
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fprintf(out,"mov ax,gs:[di+%i]\n",x+y*320);
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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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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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c++;
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}
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}
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#define MINX 10
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#define MAXX 10
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#define MINY 8
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#define MAXY 8
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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,"dw OFFSET lblt_1b0 ;only dot\n",x&63,y&63);
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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=-MINY;y<=MAXY;y++)
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{
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for(x=-MINX;x<=MAXX;x++)
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{
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fprintf(out,"dw OFFSET lblt_%i%b%i\n",x&63,y&63);
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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=-MINY;y<=MAXY;y++)
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{
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for(x=-MINX;x<=MAXX;x++)
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{
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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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