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glDrawPixels

Started by klems Jan 18, 2003 at 11:06 AM 4 replies 250+ views

Original Post

Jan 18, 2003 at 11:06 AM

The OpenGL red book reccomends glDrawPixels if you want to draw a 2D image in OpenGL, but I recall hearing some people here on GDNet saying that the glRead/DrawPixels functions are really slow. Was that only for glReadPixels, or should I use some other way to draw 2D stuff?

I tolerate no intolerance!

Halo7

Jan 18, 2003 at 12:28 PM

I have found it faster to texture a quad than use glDrawPixels.

Halo7

klems

Jan 18, 2003 at 6:05 PM

I figured that too, but then the texture filtering comes into play, chich can seriously mess up low-res images. How can I avoid the filtering screwing my low-res images up?

I tolerate no intolerance!

Brother Bob

Jan 18, 2003 at 6:11 PM

If you''re talking about the image getting blurry, set magnification filtering to GL_NEAREST.

klems

Jan 18, 2003 at 6:18 PM

OK, thanks!

I tolerate no intolerance!

Raduprv

Jan 18, 2003 at 6:19 PM

Or, just go into the Ortho mode, and display the texture at it''s real size, so you will have no filterign whatsoever.

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