embedding glut application in win32api

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i have done a opengl application in win32 only using platform library.
it was performing very slow so i decided to do the same opengl project using glut library

opengl code workes fine in glut but not in win32.

i thought it would be because of wm-paint so i did it with timer but no effect even
played with pixel struct.

so how can i integrate opengl code in win32 without loss in performance

Posted 21-Jun-12 18:50pm

01.mandar

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Santhosh G_ · Answer 1 · 2012-06-22T01:51:00

Solution 1

After drawing a frame, please call ::ValidateRect( m_hRenderingWindow, 0 ); of the corresponding Window. m_hRenderingWindow is the window where you drawing opengl scene. 0 is given to avoid the entire region from updating on next time.

Please try like this:

C++

LRESULT CALLBACK WindowProc( HWND   hWnd, 
							 UINT   msg, 
							 WPARAM wParam, 
							 LPARAM lParam )
switch( msg )
	{
        case WM_PAINT:
	{
....  
RenderScene(); // Prepares your sence.

ValidateRect( m_hRenderWindow, 0 ); // Specifies that entire region of window should be avoided from update region.
	}
.....
}

Posted 22-Jun-12 1:51am

Santhosh G_

Updated 22-Jun-12 2:15am

v3

Comments

Richard MacCutchan 22-Jun-12 7:54am

ValidateRect() takes a HWND not a HDC as parameter 1.

Santhosh G_ 22-Jun-12 8:16am

Thanks Richard, I corrected the answer.

01.mandar 22-Jun-12 10:10am

i have already passed NULL.
is there anything that increase win32 opengl execution which i may have missed out.

i am puzzled how have glut optimized their loop?

Santhosh G_ 22-Jun-12 10:28am

If issue is related to unwanted WM_PAINT message, then ValidateRect can solve.
What are the operations in your drawing ?
Is there any chance to consume much time for the processing ?