unit fPortalD;

interface

uses
  Winapi.OpenGL,
  System.SysUtils,
  System.Classes,
  System.Math,
  System.Types,
  Vcl.Graphics,
  Vcl.Controls,
  Vcl.Forms,
  Vcl.Dialogs,
  Vcl.Grids,
  Vcl.StdCtrls,
  Vcl.ExtCtrls,
  Vcl.Imaging.Jpeg,

  GLS.Scene,

  Stage.VectorTypes,
  GLS.PersistentClasses,
  Stage.Keyboard,
  GLS.Coordinates,
  GLS.BaseClasses,
  GLS.XCollection,
  Stage.Utils,

  GLS.Texture,
  GLS.VectorFileObjects,
  GLS.Objects,
  GLS.Cadencer,
  GLS.Portal,
  GLS.SceneViewer,

  GLS.Material,
  GLS.SimpleNavigation;

type
  TFormPortal = class(TForm)
    Label1: TLabel;
    GLScene1: TGLScene;
    GLSceneViewer1: TGLSceneViewer;
    Label2: TLabel;
    BUForward: TButton;
    BUTurnLeft: TButton;
    BUTurnRight: TButton;
    BUBackward: TButton;
    SGMap: TStringGrid;
    GLMaterialLibrary1: TGLMaterialLibrary;
    BBProcess: TButton;
    GLLightSource1: TGLLightSource;
    DummyCube1: TGLDummyCube;
    GLCamera1: TGLCamera;
    Timer1: TTimer;
    GLCadencer1: TGLCadencer;
    Portal1: TGLPortal;
    Label3: TLabel;
    CBAuto: TCheckBox;
    CBFog: TCheckBox;
    procedure FormCreate(Sender: TObject);
    procedure BBProcessClick(Sender: TObject);
    procedure BUTurnLeftClick(Sender: TObject);
    procedure BUTurnRightClick(Sender: TObject);
    procedure BUForwardClick(Sender: TObject);
    procedure BUBackwardClick(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure GLCadencer1Progress(Sender: TObject;
      const deltaTime, newTime: Double);
    procedure SGMapSetEditText(Sender: TObject; ACol, ARow: Integer;
      const Value: String);
    procedure CBFogClick(Sender: TObject);
    procedure GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState;
      X, Y: Integer);
    procedure GLSceneViewer1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure FormMouseWheel(Sender: TObject; Shift: TShiftState;
      WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
  private

    mx, my: Integer;
  public

    portalCount, triangleCount: Integer;
  end;

var
  FormPortal: TFormPortal;

implementation

{$R *.DFM}

procedure TFormPortal.FormCreate(Sender: TObject);
var
  i: Integer;
begin
  var Path: TFileName := GetCurrentAssetPath();
  // Load Texture for ground
  SetCurrentDir(Path  + '\texture');

  for i := 0 to 15 do
    SGMap.Cells[i, i] := 'X';
  SGMap.Cells[8, 8] := '';
  SGMap.Col := 8;
  SGMap.Row := 12;
  with GLMaterialLibrary1 do
  begin
    AddTextureMaterial('gnd', 'walkway.jpg');
    with AddTextureMaterial('wall', 'rawwall.jpg') do
    begin
      TextureScale.Y := 3;
    end;
  end;
  BBProcessClick(Self);
end;

procedure TFormPortal.FormMouseWheel(Sender: TObject; Shift: TShiftState;
  WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
begin
  GLCamera1.AdjustDistanceToTarget(Power(1.1, WheelDelta / 120));
end;

procedure TFormPortal.BBProcessClick(Sender: TObject);
var
  X, Y, n: Integer;
  h: Single;
  Sector: TGLSectorMeshObject;
  Poly: TFGPolygon;
begin
  h := 3;
  portalCount := 0;
  triangleCount := 0;
  Portal1.MeshObjects.Clear;
  for X := -7 to 8 do
    for Y := -7 to 8 do
    begin
      Sector := TGLSectorMeshObject.CreateOwned(Portal1.MeshObjects);
      with Sector.Vertices do
      begin
        n := Count;
        Add(X, 0, Y);
        Add(X + 1, 0, Y);
        Add(X + 1, 0, Y + 1);
        Add(X, 0, Y + 1);
        Add(X, h, Y);
        Add(X + 1, h, Y);
        Add(X + 1, h, Y + 1);
        Add(X, h, Y + 1);
      end;
      with Sector.TexCoords do
      begin
        Add(0, 0, 0);
        Add(1, 0, 0);
        Add(1, 1, 0);
        Add(0, 1, 0);
      end;
      // ground
      Sector.Normals.Add(0, 1, 0);
      if SGMap.Cells[X + 7, Y + 7] = '' then
      begin
        Poly := TFGPolygon.CreateOwned(Sector.FaceGroups);
        with Poly do
        begin
          MaterialName := 'gnd';
          Add(n + 0, 0, 0);
          Add(n + 3, 0, 3);
          Add(n + 2, 0, 2);
          Add(n + 1, 0, 1);
        end;
      end;
      // front wall
      Sector.Normals.Add(0, 0, 1);
      if (Y = -7) or (SGMap.Cells[X + 7, Y - 1 + 7] <> '') then
      begin
        Poly := TFGPolygon.CreateOwned(Sector.FaceGroups);
        Poly.MaterialName := 'wall';
        Inc(triangleCount, 2);
      end
      else
      begin
        Poly := TFGPortalPolygon.CreateOwned(Sector.FaceGroups);
        TFGPortalPolygon(Poly).DestinationSectorIndex := (X + 7) * 16 +
          (Y - 1 + 7);
        Inc(portalCount);
      end;
      with Poly do
      begin
        Add(n + 0, 1, 3);
        Add(n + 1, 1, 2);
        Add(n + 5, 1, 1);
        Add(n + 4, 1, 0);
      end;
      // left wall
      Sector.Normals.Add(1, 0, 0);
      if (X = -7) or (SGMap.Cells[X - 1 + 7, Y + 7] <> '') then
      begin
        Poly := TFGPolygon.CreateOwned(Sector.FaceGroups);
        Poly.MaterialName := 'wall';
        Inc(triangleCount, 2);
      end
      else
      begin
        Poly := TFGPortalPolygon.CreateOwned(Sector.FaceGroups);
        TFGPortalPolygon(Poly).DestinationSectorIndex := (X - 1 + 7) * 16
          + (Y + 7);
        Inc(portalCount);
      end;
      with Poly do
      begin
        Add(n + 4, 2, 1);
        Add(n + 7, 2, 0);
        Add(n + 3, 2, 3);
        Add(n + 0, 2, 2);
      end;
      // right wall
      Sector.Normals.Add(-1, 0, 0);
      if (X = 8) or (SGMap.Cells[X + 1 + 7, Y + 7] <> '') then
      begin
        Poly := TFGPolygon.CreateOwned(Sector.FaceGroups);
        Poly.MaterialName := 'wall';
        Inc(triangleCount, 2);
      end
      else
      begin
        Poly := TFGPortalPolygon.CreateOwned(Sector.FaceGroups);
        TFGPortalPolygon(Poly).DestinationSectorIndex := (X + 1 + 7) * 16
          + (Y + 7);
        Inc(portalCount);
      end;
      with Poly do
      begin
        Add(n + 1, 3, 3);
        Add(n + 2, 3, 2);
        Add(n + 6, 3, 1);
        Add(n + 5, 3, 0);
      end;
      // back wall
      Sector.Normals.Add(0, 0, 1);
      if (Y = 8) or (SGMap.Cells[X + 7, Y + 1 + 7] <> '') then
      begin
        Poly := TFGPolygon.CreateOwned(Sector.FaceGroups);
        Poly.MaterialName := 'wall';
        Inc(triangleCount, 2);
      end
      else
      begin
        Poly := TFGPortalPolygon.CreateOwned(Sector.FaceGroups);
        TFGPortalPolygon(Poly).DestinationSectorIndex := (X + 7) * 16 +
          (Y + 1 + 7);
        Inc(portalCount);
      end;
      with Poly do
      begin
        Add(n + 3, 4, 2);
        Add(n + 7, 4, 1);
        Add(n + 6, 4, 0);
        Add(n + 2, 4, 3);
      end;
    end;
  Portal1.StructureChanged;
end;

procedure TFormPortal.BUTurnLeftClick(Sender: TObject);
begin
  DummyCube1.Turn(-15);
  GLCamera1.TransformationChanged;
end;

procedure TFormPortal.BUTurnRightClick(Sender: TObject);
begin
  DummyCube1.Turn(+15);
  GLCamera1.TransformationChanged;
end;

procedure TFormPortal.BUForwardClick(Sender: TObject);
begin
  DummyCube1.Move(-0.25);
  GLCamera1.TransformationChanged;
end;

procedure TFormPortal.BUBackwardClick(Sender: TObject);
begin
  DummyCube1.Move(0.25);
  GLCamera1.TransformationChanged;
end;

procedure TFormPortal.Timer1Timer(Sender: TObject);
begin
  Caption := Format('%.2f FPS - %d Portals - %d Triangles',
    [GLSceneViewer1.FramesPerSecond, portalCount, triangleCount]);
  GLSceneViewer1.ResetPerformanceMonitor;
end;

procedure TFormPortal.GLCadencer1Progress(Sender: TObject;
  const deltaTime, newTime: Double);
begin
  if IsKeyDown('Z') or IsKeyDown('W') then
    DummyCube1.Move(-3 * deltaTime)
  else if IsKeyDown('S') then
    DummyCube1.Move(3 * deltaTime);
  if IsKeyDown('A') or IsKeyDown('Q') then
    DummyCube1.Turn(-60 * deltaTime)
  else if IsKeyDown('D') then
    DummyCube1.Turn(60 * deltaTime);
  GLCamera1.TransformationChanged;
end;

procedure TFormPortal.GLSceneViewer1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  mx := X;
  my := Y;
end;

procedure TFormPortal.GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin
  if ssLeft in Shift then
  begin
    GLCamera1.MoveAroundTarget(my - Y, mx - X);
  end;
  mx := X;
  my := Y;
end;

procedure TFormPortal.SGMapSetEditText(Sender: TObject; ACol, ARow: Integer;
  const Value: String);
begin
  if CBAuto.Checked then
    BBProcessClick(Self);
end;

procedure TFormPortal.CBFogClick(Sender: TObject);
begin
  if CBFog.Checked then
    GLCamera1.DepthOfView := 11
  else
    GLCamera1.DepthOfView := 100;
  GLSceneViewer1.Buffer.FogEnable := CBFog.Checked;
end;

end.