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type
  TJpegImage = TBitmap					

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uses
  OpenGL12, SysUtils, QGraphics, Classes;
  // Windows, OpenGL12, SysUtils, Graphics, JPEG, Classes;					

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type
  TJpegImage = TBitmap;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure InitGL;
    procedure DrawScene; 
    procedure ApplicationEvents1Idle(Sender: TObject; var Done: Boolean);
  private
    { Private-Deklarationen }
  public 
    { Public-Deklarationen }
  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); 
InitGL;
Application.OnIdle := ApplicationEvents1Idle;
end; 

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

procedure TForm1.DrawScene; 
begin 
  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT); 
  glLoadIdentity;

  glTranslate(0,0,-5); 
  glBegin(GL_QUADS); 
    glVertex3f(1,-1,0); 
    glVertex3f(1,1,0); 
    glVertex3f(-1,1,0); 
    glVertex3f(-1,-1,0); 
  glEnd; 
   
  SwapBuffers(h_DC);  
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 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;

end.					

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procedure TForm1.DrawScene; 
begin
  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
  glLoadIdentity;

  glTranslate(0,0,-5);
  glBegin(GL_QUADS);
    glVertex3f(1,-1,0);
    glVertex3f(1,1,0);
    glVertex3f(-1,1,0);
    glVertex3f(-1,-1,0);
  glEnd;

  SwapBuffers(h_DC);
end;