home *** CD-ROM | disk | FTP | other *** search
- {
- Voxel's in a litteral sence are "Volume Pixels" so to do it 100% correctly
- you would have to draw a 3d rectangular box at each coord.
-
- Fortunitely there is an easy way to make it MUCH faster with out loosing
- much detail.
-
- Here is a re-work of the voxel code posted earlier. I have renamed
- everything so it would be easier to follow. I have also added color
- interpolation when drawing it. I haven't played with it in a while (cause
- I like to write all my own code), but I'm sure everything is in working
- order.
- }
- Program VoxelLand; {$G+}
- { Alex Chalfin }
- { Yet another modified source of Voxels (I forget who posted it first) }
- { Added: Gouraud interpolation of the colors for a smoother look }
- { It might be a little faster. }
- { Internet: achalfin@uceng.uc.edu }
- { Fidonet: 1:108/180 }
-
- Uses Crt;
- Type MapArray = Array[0..65534] of Byte; ScreenArray=Array[0..63999] of Byte;
- PMapArray = ^MapArray; PScreenArray = ^ScreenArray;
-
- Var Map : PMapArray; VScreen : PScreenArray; Screen : PScreenArray;
- Range : Array[0..319] of Byte;
- Sine, Cosine : Array[0..511] of Integer;
-
- Procedure InitGraph;
- Begin Screen := Ptr($A000, 0); New(VScreen);
- Asm; Mov ax,13h; Int 10h; End; End;
-
- Procedure CloseGraph;
- Begin Asm; Mov ax,3h; Int 10h; End; Dispose(VScreen); End;
-
- Procedure ClearScreen(Var S); Assembler;
- Asm; Les di,S; db 66h; Xor ax,ax; Mov cx,16000; db 66h; Rep Stosw; End;
-
- Procedure CopyScreen(Var S, D); Assembler;
- Asm; Push ds;Les di,D;Lds si,S;Mov cx,16000;db 66h;Rep Movsw;Pop ds; End;
-
- Procedure SetColor(Color, R, G, B : Byte);
- Begin Port[$3c8]:=Color;Port[$3c9]:=R;Port[$3c9]:=G;Port[$3c9]:=B;End;
-
- Procedure InitPalette;
- Var Count : Word;
- Begin For Count := 1 to 25 do SetColor(Count, Count*2, Count*2, 63);
- For Count := 25 to 127 do SetColor(Count, Count Div 3, Count Div 2, 0); End;
-
- Function NewColor(Mc, N, Dvd : integer) : Byte;
- Var Loc : Integer;
- Begin Loc := (Mc + N - Random(N Shl 1)) Div Dvd - 1;
- If Loc > 250 Then Loc := 250;
- If Loc < 5 Then Loc:=5; NewColor := Lo(Loc); End;
-
- Procedure MakeFractalMap(X1, Y1, X2, Y2 : Word);
- Var Xn, Yn, Dxy, P1, P2, P3, P4 : Word;
- Begin If ((x2-x1<2) and (y2-y1<2)) Then Exit;
- P1:=Map^[(Y1 Shl 8)+X1]; P2:=Map^[(Y2 Shl 8)+X1]; P3:=Map^[(Y1 Shl 8)+X2];
- P4:=Map^[(Y2 Shl 8)+X2]; Xn:=(X2+X1) Shr 1; Yn:=(Y2+Y1) Shr 1;
- Dxy:=5 * (X2 - X1 + Y2 - Y1) Div 3;
- If Map^[(Y1 Shl 8)+Xn]=0 Then Map^[(Y1 Shl 8)+Xn]:=NewColor(P1+P3,Dxy,2);
- If Map^[(Yn Shl 8)+X1]=0 Then Map^[(Yn Shl 8)+X1]:=NewColor(P1+P2,Dxy,2);
- If Map^[(Yn Shl 8)+X2]=0 Then Map^[(Yn Shl 8)+X2]:=NewColor(P3+P4,Dxy,2);
- If Map^[(Y2 Shl 8)+Xn]=0 Then Map^[(Y2 Shl 8)+Xn]:=NewColor(P1+P2,Dxy,2);
- Map^[(Yn Shl 8)+Xn] := NewColor(P1 + P2 + P3 + P4, Dxy, 4);
- MakeFractalMap(X1, Y1, Xn, Yn); MakeFractalMap(Xn, Y1, X2, Yn);
- MakeFractalMap(X1, Yn, Xn, Y2); MakeFractalMap(Xn, Yn, X2, Y2); End;
-
- Procedure CreateMap;
- Begin Randomize; New(Map); FillChar(Map^[0], (256*256)-1, 0);
- Map^[0]:=128; Writeln('Generating map.'); MakeFractalMap(0,0,256,256); End;
-
- Procedure MakeSinus;
- Var Count : Word;
- Begin For Count := 0 to 511 do Begin
- Sine[Count] := Round(Sin(Count*((2*Pi)/512)) * 256);
- Cosine[Count] := Round(Cos(Count*((2*Pi)/512)) * 256); End;End;
-
- Procedure InterPollColor(Y, Y2, X, MapColor: Integer); Assembler;
- Asm; Les di,VScreen; Mov ax,Y2;Cmp ax,199;Jl @GouraudColor;@FlatColor:
- Mov bx,320;IMul bx;Add ax,X;Add di,ax; Mov cx,Y2;Sub cx,Y;Mov ax,MapColor
- @FlatLooper:;Mov es:[di],al;Sub di,320;Dec cx;Jnz @FlatLooper;Jmp @Exit
- @GouraudColor:;Mov cx,ax; Sub cx,Y;Mov bx,320;IMul bx;Add ax,X
- Add di,ax;Mov ax,MapColor;Xor bx,bx;Mov bl,Byte Ptr es:[di+320]
- Push bx;Sub ax,bx;Shl ax,8;Cwd;Idiv cx;Mov bx,ax;Pop ax;Shl ax,8
- Shr cx,1;Jnc @Gouraud4Looper;Mov es:[di],ah;Add ax,bx;Sub di,320
- Jcxz @Exit;@Gouraud4Looper:;Mov es:[di],ah;Add ax,bx;Sub di,320
- Mov es:[di],ah;Add ax,bx;Sub di,320;Dec cx;Jnz @Gouraud4Looper;@Exit: End;
-
- Procedure DisplayLandScape(XPos, YPos, Dir : Integer);
- Const ScreenWidth = 320;
- Var ViewerZ, YDepth, ColWidth,XCount, YCount, NewX, NewY : Integer;
- ProjX, ProjY, ZPos, MapColor,BarCount, CrossCount : Integer;
- LeftLine, RightLine,YSin, YCos : Integer;
-
- Begin
- FillChar(Range, 320, 199); ViewerZ := Map^[(YPos Shl 8)+XPos] + 100;
- For YCount := YPos to (YPos + 50) do
- Begin YDepth := ((YCount-YPos) Shl 1)+1; ColWidth:=(300 Div YDepth)+4;
- LeftLine:=(XPos+(YPos-YCount));RightLine:=(XPos + (-YPos + YCount));
- YSin := (YCount-YPos) * Sine[Dir];YCos := (YCount-YPos) * CoSine[Dir];
- For XCount := LeftLine to RightLine do
- Begin
- NewX := ((XCount-XPos)*CoSine[Dir]+YSin) Shr 8 + XPos;
- NewY := (YCos-(XCount-XPos)*Sine[Dir]) Shr 8 + YPos;
- ProjX := ((XCount-XPos) * ScreenWidth) Div YDepth + 160;
- If (ProjX >= 0) And ((ProjX + ColWidth) <= 319)
- Then Begin
- ZPos := Map^[(NewY Shl 8) + NewX]; MapColor := ZPos Shr 1;
- If ZPos <= 50 Then ZPos := 50;
- ProjY := ((ViewerZ - ZPos) Shl 5) Div YDepth + 100;
- If (ProjY >= 0) And (ProjY <= 199)
- Then Begin For BarCount := ProjX to (ProjX + ColWidth) do
- Begin If ProjY < Range[BarCount] Then Begin
- InterPollColor(ProjY, Range[BarCount], BarCount, MapColor);
- Range[BarCount] := ProjY; End;End;End;End;End;End;End;
-
- Function Voxelize : Real;
-
- Var Time : Longint Absolute $0000:$046c; StartTime, EndTime, Frame : Longint;
- XPos, YPos, Dir : Integer; Quit : Boolean;
-
- Begin
- InitGraph; InitPalette;Quit:=False;XPos:=0;YPos:=0;Dir:=0;StartTime:=Time;
- Frame := 0;
- Repeat
- Dir := Dir And 511; Frame := Frame + 1;
- ClearScreen(VScreen^); DisplayLandscape(XPos Shr 8, YPos Shr 8, Dir);
- CopyScreen(VScreen^, Screen^);
- If KeyPressed Then Begin
- Case ReadKey of #0 : Case ReadKey of
- #75 : Dir := Dir - 10; #77 : Dir := Dir + 10; { Right Key }
- #72 : Begin XPos:=(XPos+Sine[Dir] Shl 2);
- YPos := (YPos + CoSine[Dir] Shl 2); End;
- #80 : Begin XPos := (XPos - Sine[Dir] Shl 2);
- YPos := (YPos - CoSine[Dir] Shl 2); End;
- End; #27 : Quit := True; End; End;
- Until Quit; EndTime := Time; CloseGraph; Dispose(Map);
- Voxelize := (Frame*18.2)/(EndTime-StartTime); End;
-
- Begin
- MakeSinus; CreateMap; Writeln(Voxelize:5:2, ' Frames per second');
- End.
-
-
-
-
- This one is a little longer (ok, alot), but it looks cool!
-
- Alex
-
- ... I haven't lost my mind; it's backed up on tape somewhere!
- ___ Blue Wave/QWK v2.12
-
- --- WILDMAIL!/WC v4.11
- * Origin: Cormac mac Airt BBS - Cincinnati, OH (513) 731-4493 (1:108/180.0)
- SEEN-BY: 108/50 155 180 220 325 396/1 3615/50 51
- PATH: 108/180 220 3615/50
-