OpenGL multiple small rendering sections

ThaUnknownProgga · 2000-03-14T21:29:31

I''ve recently started work on a 3d graphics editor of sorts. I was thinking of how I wanted to do it, and I decided I was sick of working soley with DirectX. It''s time I learn a thing or two about this OpenGL. First of all, OMG, this API is great! So easy! So functional! Alright anyway, here''s what I want to do. I want to have like 4 seperate little black boxes where rendering takes place (top view, side view...) right now, the whole window is black. I tried glViewport(100, 100, 100, 100); (much smaller than my window. This changes the size of the the triangle (all I''m drawing right now) but it still clears the whole screen to black. How can i make this only clear a small rectangular section that i specify? Also, how should i go about creating the 4 different rendering sections?

Graphics and GPU Programming Programming OpenGL

Started by ThaUnknownProgga March 09, 2000 08:41 PM

11 comments, last by ThaUnknownProgga 24 years, 1 month ago

ThaUnknownProgga

122

Author

March 14, 2000 02:41 PM

The problem is that when I call SwapBuffers it copies all of the offscreen buffer into the Hdc. This is because I learned through a tutorial that does double buffering. So how do i fix this now?

ThaUnknownProgga

122

Author

March 14, 2000 09:14 PM

Should I somehow be defining an HDC that is only the rectangle I want drawn? Or is there another way of rendering in OpenGL, besides double buffereing and using SwapBuffers?

ThaUnknownProgga

122

Author

March 14, 2000 09:29 PM

I figured out how to pull out the double buffering code and it does what i want now, but now there''s some flicker. Anyway to eliminate this?

OpenGL multiple small rendering sections

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OpenGL multiple small rendering sections

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