unit fCelShadingD;

interface

uses
  Winapi.Windows,
  Winapi.OpenGL,
  System.SysUtils,
  System.Classes,
  System.Math,
  Vcl.Graphics,
  Vcl.Controls,
  Vcl.Forms,
  Vcl.Dialogs,
  Vcl.Imaging.Jpeg,

  GLS.Scene,
  GLScene.VectorTypes,
  GLScene.VectorGeometry,
  GLS.Cadencer,
  GLS.SceneViewer,
  GLS.VectorFileObjects,
  GLS.AsyncTimer,
  GLS.GeomObjects,
  GLS.Texture,
  GLS.Objects,

  GLS.Material,
  GLS.Coordinates,
  GLS.BaseClasses,
  GLS.FileMD2,
  GLS.XCollection,
  GLScene.Utils,
  GLSL.ShapeShaders;

type
  TFormCelShading = class(TForm)
    GLScene1: TGLScene;
    GLSceneViewer1: TGLSceneViewer;
    GLMaterialLibrary1: TGLMaterialLibrary;
    GLCadencer1: TGLCadencer;
    GLCamera1: TGLCamera;
    GLDummyCube1: TGLDummyCube;
    GLLightSource1: TGLLightSource;
    GLActor1: TGLActor;
    AsyncTimer1: TGLAsyncTimer;
    GLTexturedCelShader: TGLCelShader;
    GLColoredCelShader: TGLCelShader;
    GLTorus1: TGLTorus;
    procedure GLSceneViewer1MouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer);
    procedure GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
    procedure FormCreate(Sender: TObject);
    procedure AsyncTimer1Timer(Sender: TObject);
    procedure GLCadencer1Progress(Sender: TObject; const deltaTime, newTime: Double);
  private

  public

    mx, my, lx, ly: Integer;
  end;

var
  FormCelShading: TFormCelShading;

implementation

{$R *.dfm}

procedure TFormCelShading.FormCreate(Sender: TObject);
begin
  var Path: TFileName := GetCurrentAssetPath();
  SetCurrentDir(Path + '\modelext');
  GLActor1.LoadFromFile('waste.md2');
  var
    r: Single := GLActor1.BoundingSphereRadius;
  GLActor1.Scale.SetVector(2.5 / r, 2.5 / r, 2.5 / r);
  GLActor1.AnimationMode := aamLoop;
  GLMaterialLibrary1.Materials[0].Material.Texture.Image.LoadFromFile('wastecell.jpg');
end;

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

procedure TFormCelShading.GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin
  mx := X;
  my := Y;
end;

procedure TFormCelShading.AsyncTimer1Timer(Sender: TObject);
begin
  FormCelShading.Caption := Format('GLScene Cel Shading - %.2f FPS',
    [GLSceneViewer1.FramesPerSecond]);
  GLSceneViewer1.ResetPerformanceMonitor;
end;

procedure TFormCelShading.GLCadencer1Progress(Sender: TObject; const deltaTime, newTime: Double);
begin
  if IsKeyDown(VK_LBUTTON) then
  begin
    GLCamera1.MoveAroundTarget(ly - my, lx - mx);
    lx := mx;
    ly := my;
  end;

  GLTorus1.TurnAngle := 15 * Sin(newTime * 5);
  GLTorus1.PitchAngle := 15 * Cos(newTime * 5);
end;

end.