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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OpenGL12, AppEvnts, Textures;

type
  TForm1 = class(TForm)
    ApplicationEvents1: TApplicationEvents;
    procedure FormCreate(Sender: TObject);
    procedure InitGL;
    procedure DrawScene;
    procedure ApplicationEvents1Idle(Sender: TObject; var Done: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

procedure SetDCPixelFormat(Handle: HDC);


var
  Form1: TForm1;
  h_DC: hDC;
  hRC: HGLRC;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
InitOpenGL;
  h_DC:=GetDC(Handle);
  SetDCPixelFormat(h_DC);
  hRC:=wglCreateContext(h_DC);
  wglMakeCurrent(h_DC,hRC);
  Application.OnIdle := ApplicationEvents1Idle;
end;

procedure SetDCPixelFormat(Handle: HDC);
  var
    nPixelFormat: GLUint;
  const
    pfd: PIXELFORMATDESCRIPTOR = (
        nSize: sizeof( PIXELFORMATDESCRIPTOR );
        nVersion: 1;
        dwFlags: PFD_DRAW_TO_WINDOW
        or PFD_SUPPORT_OPENGL
        or PFD_DOUBLEBUFFER;
        iPixelType: PFD_TYPE_RGBA;
        cColorBits: 16;
        cRedBits: 0;
        cRedShift: 0;
        cGreenBits: 0;
        cBlueBits: 0;
        cBlueShift: 0;
        cAlphaBits: 0;
        cAlphaShift: 0;
        cAccumBits: 0;
        cAccumRedBits: 0;
        cAccumGreenBits: 0;
        cAccumBlueBits: 0;
        cAccumAlphaBits: 0;
        cDepthBits: 16;
        cStencilBits: 0;
        cAuxBuffers: 0;
        iLayerType: PFD_MAIN_PLANE;
        bReserved: 0;
        dwLayerMask: 0;
        dwVisibleMask: 0;
        dwDamageMask: 0
    );
  begin
    nPixelFormat:=ChoosePixelFormat(h_DC, @pfd);
    SetPixelFormat(h_DC,nPixelFormat,@pfd);
  end;

procedure TForm1.InitGL;
begin
  glClearColor(0,0,0,0);
  glClearDepth(1);
  glDepthFunc(GL_LESS);
  glShadeModel(GL_SMOOTH);
  glEnable(GL_DEPTH_TEST);

  glViewport(0,0,Width,Height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity;
  gluPerspective(45,Width/Height,1,100);
  glMatrixMode(GL_MODELVIEW);
end;

procedure TForm1.DrawScene;
begin
  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
  glLoadIdentity;
  
  glBegin(GL_QUADS); 
  glVertex3f(1,-1,-5); 
  glVertex3f(1,1,-5); 
  glVertex3f(-1,1,-5); 
  glVertex3f(-1,-1,-5);
glEnd;
glTranslate(0,0,-5); 
glBegin(GL_QUADS); 
  glColor3f(1,0,0);  //Rot 
  glVertex3f(1,-1,0); 
  glColor3f(1,1,0);  //Gelb 
  glVertex3f(1,1,0); 
  glColor3f(0,1,0);  //Grün 
  glVertex3f(-1,1,0); 
  glColor3f(0,0,1);  //Blau 
  glVertex3f(-1,-1,0); 
glEnd;

  SwapBuffers(h_DC);
end;

procedure TForm1.ApplicationEvents1Idle(Sender: TObject;
  var Done: Boolean);
begin
DrawScene; 
Done:=False;
end;

end.                    

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  glBegin(GL_QUADS);
  glVertex3f(1,-1,-5);
  glVertex3f(1,1,-5);
  glVertex3f(-1,1,-5);
  glVertex3f(-1,-1,-5);
glEnd;
glTranslate(0,0,-5);
glBegin(GL_QUADS);
  glColor3f(1,0,0);  //Rot
  glVertex3f(1,-1,0);
  glColor3f(1,1,0);  //Gelb
  glVertex3f(1,1,0);
  glColor3f(0,1,0);  //Grün
  glVertex3f(-1,1,0);
  glColor3f(0,0,1);  //Blau
  glVertex3f(-1,-1,0);
glEnd;                    

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glTranslate(0,0,-5);
glBegin(GL_QUADS);
  glColor3f(1,0,0);  //Rot
  glVertex3f(1,-1,0);
  glColor3f(1,1,0);  //Gelb
  glVertex3f(1,1,0);
  glColor3f(0,1,0);  //Grün
  glVertex3f(-1,1,0);
  glColor3f(0,0,1);  //Blau
  glVertex3f(-1,-1,0);
glEnd;                    

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procedure TForm1.FormResize(Sender: TObject);
begin
glViewport(0, 0, form1.clientWidth, form1.clientHeight);    // Setzt den Viewport für das OpenGL Fenster
glMatrixMode(GL_PROJECTION);        // Matrix Mode auf Projection setzen
glLoadIdentity();                   // Reset View
gluPerspective(45.0, form1.clientWidth/form1.clientHeight, 1, 100.0);  // Perspektive den neuen Maßen anpassen.
glMatrixMode(GL_MODELVIEW);         // Zurück zur Modelview Matrix
glLoadIdentity();
end;