title: Shader TextureLod parameter value?
body: <p>What value does the LOD parameter take for <a href="https://www.opengl.org/sdk/docs/man/html/textureLod.xhtml" rel="noreferrer">texturelod</a>? The spec I found doesn't mention it at all. Is it a percentage or an index value with a percent. If the later is the case, is there a way to get the number of mipmaps the texture has so that I would be able to use a percentage?</p>