March 2013
Intermediate to advanced
984 pages
26h 18m
English
book
OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition
by Dave Shreiner, Graham Sellers, John M. Kessenich, Bill M. Licea-Kane
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Calculating the Mipmap Level
The computation of which mipmap level of a texture to use for a particular pixel depends on the scale factor between the texture image and the size of the polygon to be textured (in pixels). Let’s call this scale factor ρ, and also define a second value, λ, where λ = log2 ρ + lodbias. (Since texture images can be multidimensional, it is important to clarify that ρ is the maximum scale factor of all dimensions.)
lodbias is the level-of-detail bias for the sampler, a constant value set by calling glSamplerParameteri() with the pname parameter set to GL_TEXTURE_LOD_BIAS and is used to adjust λ. By default, lodbias = 0.0, which has no effect. It’s best to start with this default value and adjust in small amounts, if needed. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.