Problem porting 3D world function to lazarus

[crash_master25]

Hi!!

I have a  problem, I'm working in a 3D creator appz, I'm useing a 3D engine library, but I need to port it to lazars, all the port now is ok, but I have a problem with one file, because it uses TBitmap.ScanLine, and lazarus don't, then I read many forums and articles by Mattias, but really I'm new in Object Pascal and I don't understand how to make this, I hoppe you can help me how to do this...

The code is this:

----------------------------------------------------------------------------------
unit World3D;

interface

uses
  Windows, Model3D, Dialogs, Graphics, ColorConv, Global, Camera, Math;

type

  TRGBTripleArray = array[0..32767] of TRGBTriple;
  PRGBTripleArray = ^TRGBTripleArray;

  TRGBFixed = record
    R : integer;
    G : integer;
    B : integer;
  end;

  TPointColor = record
    X : single;
    Y : single;
    RGB : TRGBTriple;
  end;
  TPointColorTriangle = array[0..2] of TPointColor;

  TPointLight = record
    X : single;
    Y : single;
    N : TPoint3DSingle;
    S : TPoint3DSingle;
  end;
  TPointLightTriangle = array[0..2] of TPointLight;

  TPointTriangle = array[0..2] of TPointFloat;

  TLight = record
    Position : TPoint3D; // position of light in world
    Luminance : byte; // brightness
  end;

  TVisibleIndex = record
    ObjectIndex : integer;
    Index : integer;
    Distance : Real;
  end;
  TVisibleIndexArray = array of TVisibleIndex;

  T3DWorld = Class(TObject)
    private

      FWireframe : boolean;
      FPhong : boolean;
      FBackfaceRemoval : boolean;
      FAmbient : byte; // ambient light intensity
      FScreenRect : TRect;
      FBackgroundColor : TColor;
      Scanlines : array of pRGBTripleArray;

      procedure SetScreenRect(ARect : TRect);
      procedure RenderWireframe;
      procedure QuickSort(var A: TVisibleIndexArray; iLo, iHi: Integer);
      function PerspectiveProject(APoint3D : TPoint3D) : TPointFloat;
      procedure FlatFace(AObject, AFace : integer);
      procedure GouraudFace(AObject, AFace : integer);
      procedure PhongFace(AObject, AFace : integer);
      procedure GouraudPoly(W, H : integer ; V : TPointColorTriangle);
      procedure PhongPoly(W, H : integer ; V : TPointLightTriangle ;
                          Hue, Sat, Lum, Amb : byte);
      procedure WuLine(x1, y1, x2, y2 : integer ; R, G, B : byte);

    public

      Objects : array of T3DModel; // array of objects in world
      Camera : TCamera;
      Light : TLight;
      OffScrBmp : TBitmap; // off screen bitmap for drawing to

      procedure Render;
      procedure ClearBitmap;

      property ScreenRect : TRect read FScreenRect write SetScreenRect;
      property Wireframe : boolean read FWireframe write FWireframe;
      property Phong : boolean read FPhong write FPhong;
      property BackfaceRemoval : boolean read FBackFaceRemoval write FBackFaceRemoval;
      property Ambient : byte read FAmbient write FAmbient;
      property BackgroundColor : TColor read FBackgroundColor write FBackgroundColor;

      constructor Create;
      destructor Destroy; override;

    end;
----------------------------------------------------------------------------
Tks
Bruno Chavez

[Marmin_]

it seems scanline is not supported by Lazarus ..

[crash_master25]

Yep, I know it's not supported by lazarus, that's why I'm trying to search another way to make that function....

[matthijs]

But to check over 1000 lines of code, is a bit much So if you extract the relevant part, we could have a look.

[fatg]

Yes, or you could provide a link to the file ... Pasting large amounts of code on forums is rather unnecessary

[Anonymous]

Sorry for that, I paste the only procedure with the problem:

procedure T3DWorld.SetScreenRect(ARect : TRect);
Var
  LLine : integer;
begin
  FScreenRect := ARect;

  // set screen center position
  Camera.ScreenMid.X := ARect.Right div 2;
  Camera.ScreenMid.Y := ARect.Bottom div 2;

  // set bitmap dimensions
  OffScrBmp.Width  := ARect.Right;
  OffScrBmp.Height := ARect.Bottom;

  SetLength(Scanlines, ARect.Bottom);
  for LLine := 0 to ARect.Bottom - 1 do
    Scanlines[LLine] := OffScrBmp.ScanLine[LLine];
end;

Tks
Bruno Chavez