Double buffering

[link19]

When i rotate an object, i get heavy flickering. I understand that double buffering will prevent this, however i do not know how to implement it.
I did a search in this forum and found that its quite simple using GLUT, but i am not. There was no help for implementing it for Win32/MFC. Im using VC++6.0 and would appreciate suggestions.
TIA

[link19]

I realized i have to set the PFD_DOUBLEBUFFER flag in my SetWindowPixelFormat() method. Then i call SwapBuffers(dc.GetSafeHdc()); in my OnPaint()...but this has no effect on my view. Still have flickering when animating my object.
Ideas please??!

[Warrior]

you on the right track.
you do need to specify PFD_DOUBLEBUFFER when filling in your PIXELFORMATDESCRIPTOR structure. then, to flip the buffers you call SwapBuffers(HDC).

if you need more info, your best bet is to read NeHe's tutorial on setting up a window in Windows. go to http://nehe.gamedev.net for this tutorial

- Dave

[This message has been edited by Warrior (edited 04-16-2001).]

[danny1238]

I've just started learning how to program in OpenGL through a book called "OpenGL SuperBible". I came across the topics of double buffering and single buffering. To enable double buffering you should initialize it within the display mode before creating the window.

glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);

Also, you should use

glutSwapBuffers();

at the end of the Rendering function instead of

glFlush();

[link19]

Thx Danny...but if you had read my first post, im not using GLUT.
BTW, im still getting flickering and not sure why double buffering would not be enabled. Ive looked through NeHe's first tut and dont think im missing anything. Could there be something in my code that would prevent it?
Thx...

[JoeMac]

You might actually be using double buffers correctly and still get flickering if you have some combination of:
software rendering, a lot of polygons, slow computer, vsync disabled.
Joe

[Sanchis]

Maybe
glFinish();
SwapBuffers(wglGetCurrentDC()); ?

[DaViper]

Are you sure that you are rendering to the backbuffer with using glDrawBuffer(GL_BACK)

Chris

[link19]

My computer is fast, but i am drawing a lot of polygons...so possibly youre right. However, I commented out the SwapBuffer() call and my rendering is still visible. Does this mean that i am not drawing to the back buffer? I made the call glDrawBuffer(GL_BACK)right before i call my rendering function in OnPaint(). Is this the correct place for it?
Thx for your sugggestions...

[Deiussum]

It sounds like you are using MFC. Try over-riding the OnEraseBkgnd() function and make it return TRUE.