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unit Main;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, OpenGlEngine, Vcl.AppEvnts, dglOpenGL;

type
  TMainForm = class(TForm)
    OpenGlTarget: TPanel;
    ApplicationEvents: TApplicationEvents;
    procedure FormDestroy(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormResize(Sender: TObject);
  private
    Engine: TOpenGlEngine;
    { Private-Deklarationen }
  public
    procedure GameLoop;
    { Public-Deklarationen }
  end;

var
  MainForm: TMainForm;

implementation

{$R *.dfm}

procedure TMainForm.FormActivate(Sender: TObject);
begin
  GameLoop;
end;

procedure TMainForm.FormDestroy(Sender: TObject);
begin
  Engine.Free;
end;

procedure TMainForm.FormResize(Sender: TObject);
begin
  Engine.Resize(self.ClientWidth,self.ClientHeight);
end;

procedure TMainForm.FormShow(Sender: TObject);
begin
  Engine := TOpenGlEngine.Create(OpenGlTarget.Handle);
  Engine.Resize(self.ClientWidth,self.ClientHeight);
end;

procedure TMainForm.GameLoop;
begin
  while not Application.Terminated do
  begin
    Application.ProcessMessages;
    if Engine.CanRender then Engine.Render;
  end;
end;

end.                    

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unit OpenGLEngine;

interface

uses
  dglOpenGL, Windows;

type
  TOpenGlEngine = class
    protected
      FRC: Cardinal;
      FDC: Cardinal;
      FWindowHandle: Hwnd;
      FWidth,FHeight: Cardinal;
      FCanRender: boolean;
    protected
      procedure SetupOpenGL;
    public
      constructor Create(AWindowHandle:Hwnd);
      destructor Destroy; override;
    public
      procedure Resize(AWidth,AHeight: Cardinal);
      procedure Render;
    public
      property CanRender: boolean read FCanRender;
      property Width: Cardinal read FWidth;
      property Height: Cardinal read FHeight;
  end;

implementation

const
  NearClipping = 1;
  FarClipping  = 1000;

constructor TOpenGlEngine.Create(AWindowHandle:Hwnd);
begin
  inherited Create;
  FDC := 0;
  FWidth := 0;
  FHeight := 0;
  FCanRender := false;
  FWindowHandle := AWindowHandle;
  if not InitOpenGL then halt;

  FDC := GetDC(AWindowHandle);
  FRC := CreateRenderingContext(FDC,[opDoubleBuffered],32,24,0,0,0,0);
  ActivateRenderingContext(FDC, FRC);

  SetupOpenGL;

  FCanRender := true;

end;

destructor TOpenGlEngine.Destroy;
begin
  DeactivateRenderingContext;
  DestroyRenderingContext(FRC);
  ReleaseDC(FWindowHandle,FDC);
  inherited;
end;

procedure TOpenGlEngine.SetupOpenGL;
begin
  glClearColor(0.3, 0.4, 0.7, 0.0);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_CULL_FACE);
end;

procedure TOpenGlEngine.Resize(AWidth,AHeight: Cardinal);
begin
  FWidth := AWidth;
  FHeight := AHheight;

  glViewport(0, 0, Width, Height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity;
  gluPerspective(45.0, Width/Height, NearClipping, FarClipping);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity;

  Render;
end;

procedure TOpenGlEngine.Render;
begin
  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity;
  gluPerspective(45.0, Width/Height, NearClipping, FarClipping);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity;

  glTranslatef( -1.5,  0,  -6);

  glBegin(GL_TRIANGLES);
      glColor3f(1,0,0);
      glVertex3f(-1.0,-1.0, 0.0);
      glColor3f(0,1,0);
      glVertex3f( 0.0, 1.0, 0.0);
      glColor3f(0,0,1);
      glVertex3f( 1.0,-1.0, 0.0);
  glEnd();


  SwapBuffers(FDC);
end;

end.                    

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  glBegin(GL_TRIANGLES);
    glColor3f(0,0,1);
    glVertex3f( 1.0,-1.0, 0.0);
    glColor3f(0,1,0);
    glVertex3f( 0.0, 1.0, 0.0);
    glColor3f(1,0,0);
    glVertex3f(-1.0,-1.0, 0.0);
  glEnd();                    

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  glEnable(GL_CULL_FACE);