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- {$X+}
- USES Crt,GFX2;
-
- CONST VGA = $A000;
- maxpolys = 6;
- A : Array [1..maxpolys,1..4,1..3] of integer =
- (
- ((-10,-10,10),(-10,10,10),(10,10,10),(10,-10,10)),
- ((-10,-10,-10),(-10,10,-10),(10,10,-10),(10,-10,-10)),
- ((-10,-10,-10),(-10,10,-10),(-10,10,10),(-10,-10,10)),
- ((10,-10,-10),(10,10,-10),(10,10,10),(10,-10,10)),
- ((10,-10,10),(10,-10,-10),(-10,-10,-10),(-10,-10,10)),
- ((10,10,10),(10,10,-10),(-10,10,-10),(-10,10,10))
- ); { The 3-D coordinates of our object ... stored as (X1,Y1,Z1), }
- { (X2,Y2,Z2) ... for the 4 points of a poly }
-
-
- Type Point = Record
- x,y,z:integer; { The data on every point we rotate}
- END;
-
-
- VAR Lines : Array [1..maxpolys,1..4] of Point; { The base object to be rotated }
- Translated : Array [1..maxpolys,1..4] of Point; { The rotated object }
- lookup : Array [0..360,1..2] of integer; { Our sin and cos lookup table }
- poly : array [0..199,1..2] of integer;
- ytopclip,ybotclip:integer; {where to clip our polys to}
- xoff,yoff,zoff:integer;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure SetMCGA; { This procedure gets you into 320x200x256 mode. }
- BEGIN
- asm
- mov ax,0013h
- int 10h
- end;
- END;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure Hline (x1,x2,y:word;col:byte;where:word); assembler;
- { This draws a horizontal line from x1 to x2 on line y in color col }
- asm
- mov ax,where
- mov es,ax
- mov ax,y
- mov di,ax
- shl ax,8
- shl di,6
- add di,ax
- add di,x1
-
- mov cx,x2
- sub cx,x1
- cmp cx,0
- jle @End
- @Loop1 :
- mov al,es:[di]
- add al,col
- { inc al}
- stosb
- loop @loop1
- @End:
- end;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure DrawPoly(x1,y1,x2,y2,x3,y3,x4,y4:integer;color:byte;where:word);
- { This draw a polygon with 4 points at x1,y1 , x2,y2 , x3,y3 , x4,y4
- in color col }
- var miny,maxy:integer;
- loop1:integer;
-
- Procedure doside (x1,y1,x2,y2:integer);
- { This scans the side of a polygon and updates the poly variable }
- VAR temp:integer;
- x,xinc:integer;
- loop1:integer;
- BEGIN
- if y1=y2 then exit;
- if y2<y1 then BEGIN
- temp:=y2;
- y2:=y1;
- y1:=temp;
- temp:=x2;
- x2:=x1;
- x1:=temp;
- END;
- xinc:=((x2-x1) shl 7) div (y2-y1);
- x:=x1 shl 7;
- for loop1:=y1 to y2 do BEGIN
- if (loop1>ytopclip-1) and (loop1<ybotclip+1) then BEGIN
- if (x shr 7<poly[loop1,1]) then poly[loop1,1]:=x shr 7;
- if (x shr 7>poly[loop1,2]) then poly[loop1,2]:=x shr 7;
- END;
- x:=x+xinc;
- END;
- END;
-
- begin
- asm
- mov si,offset poly
- mov cx,200
- @Loop1:
- mov ax,32766
- mov ds:[si],ax
- inc si
- inc si
- mov ax,-32767
- mov ds:[si],ax
- inc si
- inc si
- loop @loop1
- end; { Setting the minx and maxx values to extremes }
- miny:=y1;
- maxy:=y1;
- if y2<miny then miny:=y2;
- if y3<miny then miny:=y3;
- if y4<miny then miny:=y4;
- if y2>maxy then maxy:=y2;
- if y3>maxy then maxy:=y3;
- if y4>maxy then maxy:=y4;
- if miny<ytopclip then miny:=ytopclip;
- if maxy>ybotclip then maxy:=ybotclip;
- if (miny>199) or (maxy<0) then exit;
-
- Doside (x1,y1,x2,y2);
- Doside (x2,y2,x3,y3);
- Doside (x3,y3,x4,y4);
- Doside (x4,y4,x1,y1);
-
- for loop1:= miny to maxy do
- hline (poly[loop1,1],poly[loop1,2],loop1,color,where);
- end;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure SetUpPoints;
- { This creates the lookup table }
- VAR loop1,loop2:integer;
- BEGIN
- For loop1:=0 to 360 do BEGIN
- lookup [loop1,1]:=round(sin (rad (loop1))*16384);
- lookup [loop1,2]:=round(cos (rad (loop1))*16384);
- END;
- END;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure RotatePoints (x,Y,z:Integer);
- { This rotates the objecct in lines to translated }
- VAR loop1,loop2:integer;
- a,b,c:integer;
- BEGIN
- For loop1:=1 to maxpolys do BEGIN
- for loop2:=1 to 4 do BEGIN
- b:=lookup[y,2];
- c:=lines[loop1,loop2].x;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[y,1];
- c:=lines[loop1,loop2].z;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- add a,dx
- end;
- translated[loop1,loop2].x:=a;
- translated[loop1,loop2].y:=lines[loop1,loop2].y;
- b:=-lookup[y,1];
- c:=lines[loop1,loop2].x;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[y,2];
- c:=lines[loop1,loop2].z;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- add a,dx
- end;
- translated[loop1,loop2].z:=a;
-
-
- if x<>0 then BEGIN
- b:=lookup[x,2];
- c:=translated[loop1,loop2].y;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[x,1];
- c:=translated[loop1,loop2].z;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- sub a,dx
- end;
- b:=lookup[x,1];
- c:=translated[loop1,loop2].y;
- translated[loop1,loop2].y:=a;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[x,2];
- c:=translated[loop1,loop2].z;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- add a,dx
- end;
- translated[loop1,loop2].z:=a;
- END;
-
-
-
-
- if z<>0 then BEGIN
- b:=lookup[z,2];
- c:=translated[loop1,loop2].x;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[z,1];
- c:=translated[loop1,loop2].y;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- sub a,dx
- end;
- b:=lookup[z,1];
- c:=translated[loop1,loop2].x;
- translated[loop1,loop2].x:=a;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- mov a,dx
- end;
- b:=lookup[z,2];
- c:=translated[loop1,loop2].y;
- asm
- mov ax,b
- imul c
- sal ax,1
- rcl dx,1
- sal ax,1
- rcl dx,1
- add a,dx
- end;
- translated[loop1,loop2].y:=a;
- END;
- END;
- END;
- END;
-
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure DrawPoints;
- { This draws the translated object to the virtual screen }
- VAR loop1:Integer;
- temp:integer;
- nx:integer;
- tx1,ty1,tx2,ty2,tx3,ty3,tx4,ty4:integer;
- BEGIN
- For loop1:=1 to maxpolys do BEGIN
- If (translated[loop1,1].z+zoff<0) and (translated[loop1,2].z+zoff<0)
- and (translated[loop1,3].z+zoff<0) and (translated[loop1,4].z+zoff<0)
- then BEGIN
- temp:=round (translated[loop1,1].z)+zoff;
- nx:=translated[loop1,1].X;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,160
- mov nx,ax
- end;
- tx1:=nx;
- nx:=translated[loop1,1].Y;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,100
- mov nx,ax
- end;
- ty1:=nx;
-
-
- temp:=round (translated[loop1,2].z)+zoff;
- nx:=translated[loop1,2].X;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,160
- mov nx,ax
- end;
- tx2:=nx;
- nx:=translated[loop1,2].Y;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,100
- mov nx,ax
- end;
- ty2:=nx;
-
-
- temp:=round (translated[loop1,3].z)+zoff;
- nx:=translated[loop1,3].X;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,160
- mov nx,ax
- end;
- tx3:=nx;
- nx:=translated[loop1,3].Y;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,100
- mov nx,ax
- end;
- ty3:=nx;
-
-
- temp:=round (translated[loop1,4].z)+zoff;
- nx:=translated[loop1,4].X;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,160
- mov nx,ax
- end;
- tx4:=nx;
- nx:=translated[loop1,4].Y;
- asm
- mov ax,nx
- mov dx,ax
- sal ax,8
- sar dx,8
- idiv temp
- add ax,100
- mov nx,ax
- end;
- ty4:=nx;
-
- drawpoly (tx1,ty1,tx2,ty2,tx3,ty3,tx4,ty4,loop1,vaddr);
- END;
- END;
- END;
-
-
- {──────────────────────────────────────────────────────────────────────────}
- Procedure MoveAround;
- { This is the main display procedure. }
- VAR deg,loop1,loop2:integer;
- ch:char;
-
- BEGIN
- for loop1:=1 to 15 do
- pal (loop1,0,loop1*4+3,63-(loop1*4+3));
- pal (100,50,50,50);
-
- deg:=0;
- ch:=#0;
- Cls (vaddr,0);
- For loop1:=1 to maxpolys do
- For loop2:=1 to 4 do BEGIN
- Lines [loop1,loop2].x:=a [loop1,loop2,1]*8;
- Lines [loop1,loop2].y:=a [loop1,loop2,2]*8;
- Lines [loop1,loop2].z:=a [loop1,loop2,3]*8;
- END;
-
- cls (vaddr,0);
- cls (vga,0);
- Xoff := 160;
- Yoff:=100;
- zoff:=-500;
-
- ytopclip:=101;
- ybotclip:=100;
- line (0,100,319,100,100,vga);
- delay (2000);
- for loop1:=1 to 25 do BEGIN
- RotatePoints (deg,deg,deg);
- DrawPoints;
- line (0,ytopclip,319,ytopclip,100,vaddr);
- line (0,ybotclip,319,ybotclip,100,vaddr);
- flip (vaddr,vga);
- cls (vaddr,0);
- deg:=(deg+5) mod 360;
- ytopclip:=ytopclip-4;
- ybotclip:=ybotclip+4;
- END;
- Repeat
- if keypressed then ch:=upcase (Readkey);
- RotatePoints (deg,deg,deg);
- DrawPoints;
- line (0,0,319,0,100,vaddr);
- line (0,199,319,199,100,vaddr);
- flip (vaddr,vga);
- cls (vaddr,0);
- deg:=(deg+5) mod 360;
- Until ch=#27;
- for loop1:=1 to 25 do BEGIN
- ytopclip:=ytopclip+4;
- ybotclip:=ybotclip-4;
- RotatePoints (deg,deg,deg);
- DrawPoints;
- line (0,ytopclip,319,ytopclip,100,vaddr);
- line (0,ybotclip,319,ybotclip,100,vaddr);
- flip (vaddr,vga);
- cls (vaddr,0);
- deg:=(deg+5) mod 360;
- END;
- END;
-
-
- BEGIN
- clrscr;
- writeln ('Welcome to the fourteenth trainer! This one is on glenzing, and also');
- writeln ('throws in a faster poly, fixed point math and a lot more assembler.');
- writeln;
- Writeln ('This isn''t very interactive ... hit any key to start, and then');
- writeln ('hit the [ESC] key to exit. It is a glenzed cube spinning in the');
- writeln ('middle of the screen. Read the text file for more information on');
- writeln ('how the fixed point etc. works ... it will also help a lot if you');
- writeln ('compare it with TUTPROG9.PAS, as this is the same 3D system, just');
- writeln ('speeded up.');
- writeln;
- writeln;
- writeln;
- write ('Hit any key to continue ...');
- readkey;
- SetUpVirtual;
- SetMCGA;
- SetUpPoints;
- MoveAround;
- SetText;
- ShutDown;
- Writeln ('All done. This concludes the fourteenth sample program in the ASPHYXIA');
- Writeln ('Training series. You may reach DENTHOR under the names of GRANT');
- Writeln ('SMITH/DENTHOR/ASPHYXIA on the ASPHYXIA BBS.I also occasinally');
- Writeln ('RSAProg, comp.lang.pascal and comp.sys.ibm.pc.demos. E-mail me at :');
- Writeln (' smith9@batis.bis.und.ac.za');
- Writeln ('The numbers are available in the main text. You may also write to me at:');
- Writeln (' Grant Smith');
- Writeln (' P.O. Box 270');
- Writeln (' Kloof');
- Writeln (' 3640');
- Writeln (' Natal');
- Writeln (' South Africa');
- Writeln ('I hope to hear from you soon!');
- Writeln; Writeln;
- Write ('Hit any key to exit ...');
- readkey;
- END.
-