procedure TForm1.FormCreate(Sender: TObject);
var
pfd: TPixelFormatDescriptor;
FormatIndex: integer;
begin
fillchar(pfd,SizeOf(pfd),0);
with pfd do
begin
nSize := SizeOf(pfd);
nVersion := 1; {The current version of the desccriptor is 1}
dwFlags := PFD_DRAW_TO_WINDOW or PFD_SUPPORT_OPENGL;
iPixelType := PFD_TYPE_RGBA;
cColorBits := 24; {support 24-bit color}
cDepthBits := 32; {depth of z-axis}
iLayerType := PFD_MAIN_PLANE;
end; {with}
FormatIndex := ChoosePixelFormat(Canvas.Handle,@pfd);
GLContext := wglCreateContext(Canvas.Handle);
wglMakeCurrent(Canvas.Handle,GLContext);
end; {FormCreate}
procedure TForm1.FormPaint(Sender: TObject);
begin
{background}
glClearColor(0.0,0.4,0.0,0.0);
glClear(GL_COLOR_BUFFER_BIT);
{error checking}
errorCode := glGetError;
if errorCode<>GL_NO_ERROR then
raise Exception.Create('Error in Paint'#13+
gluErrorString(errorCode));
end;