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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Mipmap Level-of-Detail Control
In addition to the parameters controlling lodmin, lodmax, and λbase during the calculation of λ, further control over the selected level of the mipmap pyramid is provided through the GL_TEXTURE_BASE_LEVEL and GL_TEXTURE_MAX_LEVEL parameters, which may be set using glSamplerParameteri(). GL_TEXTURE_BASE_LEVEL specifies the lowest mipmap level (i.e., highest resolution) that will be sampled, regardless of the value of λ, whereas GL_TEXTURE_MAX_LEVEL specifies the highest mipmap level (i.e., lowest resolution) that will be sampled. This can be used to constrain sampling to a subset of the mipmap pyramid.
One potential use for GL_TEXTURE_BASE_LEVEL is texture streaming. When using texture streaming, storage for the ...