Re: Draw OpenGLScene without WM_PAINT

Hi Jonno,
probably owing to my bad english I did't explain correctly my problem:
I have an application named EKXXX with 3 cl*****

CEKXXXApp
CEKXXXDlg
COpenGLControl

in CEKXXXDlg there is a function named OnPaint associate at WM_PAINT
message and is

void CEKXXXDlg::OnPaint()
{
CPaintDC	dc(this); // device context for painting
if (IsIconic())
 {
	SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
	// Center icon in client rectangle
	int cxIcon = GetSystemMetrics(SM_CXICON);
	int cyIcon = GetSystemMetrics(SM_CYICON);

	CRect rect;
	GetClientRect(&rect);
	int x = (rect.Width() - cxIcon + 1) / 2;
	int y = (rect.Height() - cyIcon + 1) / 2;

	// Draw the icon
	dc.DrawIcon(x, y, m_hIcon);
 }
 else
 {
       CDialog::OnPaint();
 }
}

in COpenGLControl there is a function named OnPaint associate at
WM_PAINT message and is

void COpenGLControl::OnPaint()
{
 if(*datoOK)
 {
	/** OpenGL section **/

	openGLDevice.makeCurrent();
	DrawGLScene();
	*datoOK=false;

	temp_stato_old=tab;
 }
}

When the software don't show opengl (there are two tab, in the first
there is a text box with the program description, in the second there
is an opengl windows that draw the data received from USB) the CPU
usage is about 10%, when the opengl is showed the CPU usage is about
98%, MORE.

I think that WM_PAINT is the same windows message and when it comes
the software runs OnPaint in CEKXXXDlg and OnPaint in COpenGLControl.

I can't use Sleep(x) becuse the system became too late, how I can do
to decrease CPU usage when the software shows OpenGL windows???

Sorry and thank you

Alberto