Beginner question about OpenGL problem

ADINSX_3 · 2006-03-07T13:01:27

I 'm sure this had been asked somewhere before, but I used the search, and was unable to find anyone with the same problem as me. Heres what I want to do: Create a 3d application that doesn't clear any buffers after each loop. glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); ^-- Thats what I want to leave out. When I leave this out on the computers at my school, or on any other computer at my house, it does what I want it to do. Which is leave previously drawn pixels on the screen. On my computer, when I run the program, all of the static/lines/error-looking-stuff is in the window, flashing like crazy. I'm guessing its a problem with my graphics card or something, but I'm not sure. I have an Intel 82915G/GV/910GL Express Chipset Family Graphics card (I don't know if this information is helpful, but just in case...) On previous occasions, I just started out every OpenGL application with a black rotating quad that cleared whatever data seemed to be stuck where it didn't belong. But now I am running into situations where this won't be practical. I am using Dev-C++, and this problem occurs in the OpenGL template included with Dev-C++, and with the NeHe template I downloaded through the DevPacks sever. How do I fix this problem? (If necessary, I can post my source, although it's not much different than the templates.)

For Beginners

Started by ADINSX_3 March 06, 2006 06:54 PM

10 comments, last by kburkhart84 18 years, 1 month ago

ADINSX_3

150

Author

March 06, 2006 08:06 PM

Quote:Original post by Sneftel
You have to leave the initial glClear in. Also, if you aren't calling SwapBuffers, you may need to call glFinish after each frame. Also, of course, you need to remove the PFD_DOUBLEBUFFER attribute.

Thanks. I think I can get it working from here.

Edit: Yep. It's working now. Thanks again.

kburkhart84

3,224

March 07, 2006 01:01 PM

Quote:Original post by Sneftel
You have to leave the initial glClear in. Also, if you aren't calling SwapBuffers, you may need to call glFinish after each frame. Also, of course, you need to remove the PFD_DOUBLEBUFFER attribute.

It was the DOUBLEBUFFER attribute. If you leave it in, since drawing goes to the back buffer, you never see it if you don't swap buffers.

Beginner question about OpenGL problem

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Beginner question about OpenGL problem

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