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var
  Form1: TForm1;
  DC: HDC;
  RC: HGLRC;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);  //OpenGL init
var
pfd: TPixelFormatDescriptor;
P: Integer;
begin
fillchar(pfd, sizeof(pfd),0);
DC := getDC(Form1.Handle);
pfd.cDepthBits := 32;
pfd.cColorBits := 24;
pfd.dwFlags := PFD_DRAW_TO_WINDOW or PFD_SUPPORT_OPENGL or PFD_DOUBLEBUFFER;
P := ChoosePixelFormat(DC,@pfd);
setPixelFormat(DC,P,@pfd);
RC := wglCreateContext(DC);
wglMakeCurrent(DC,RC);
glClearColor(0,0,0,0);
Application.OnIdle := Form1.OnIdle;
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glEnable(GL_TEXTURE_2D);
end;

procedure TForm1.OnIdle (Sender: TObject; var Done: Boolean);  //Rendern
begin
Done := false;
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

SwapBuffers(DC);
end;

procedure TForm1.FormDestroy(Sender: TObject);  //Speicher entleeren
begin
wglMakeCurrent(DC,0);
wglDeleteContext(RC);
releaseDC(0,DC);
end;

procedure TForm1.FormResize(Sender: TObject);
begin
glViewPort(0,0,clientwidth,clientheight); 
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
gluPerspective(45,clientwidth/clientheight,0.1,100);
glMatrixMode(GL_MODELVIEW);
end;

end.