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OpenGL point antialiasing impact on glBitmap

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Hi all, I'm using glut bitmap fonts to display text in my app. I've discovered that point anti aliasing has a great impact on glBitmap performance - when disabled i get 332fps (eating up 99% of my athlon64 2ghz cpu). When enabled i get only 157fps (also eating up full cpu power). Consulting to the docs (opengl.org): "A bitmap is a binary image. When drawn, the bitmap is positioned relative to the current raster position, and frame buffer pixels corresponding to 1's in the bitmap are written using the current raster color or index. Frame buffer pixels corresponding to 0's in the bitmap are not modified." Now, how altering framebuffer pixels has to do with antialiasing? (of course there is no visual difference between 'anti aliased' and 'non-anti aliased' glBitmap). I'm running 64-bit debian on athlon64 2ghz, gpu is ati radeon x1300 and the driver is ati fglrx 8.31.5 (also 64bit version) on xorg 7.0. hw acceleration works (somehow.... the driver likes to crush in some circumstances).

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