Re: [Plib-users] ssgMakeMipMaps

[Steve B. <sjb...@ai...>]

jnilson_99 wrote:
> i think you're missing the point. an image doesn't need to be sized based on
> a power of two. only MIPMAPS need to be sized to a power of 2.

No - that's not true.  Even top level maps - or non-MIPmapped textures must be
a power of two in size in each dimension.

According to the RedBook description of glTexImage2D:

   "The width and height parameters give the dimensions of the texture
    image; border indicates the width of the border, which is either
    zero (no border) or one.  Both width and height must have the form
    2^m + 2b, where m is a nonnegative inteager (which can have a different
    value for width than for height) and b is the value of border."

...so, presuming you aren't using a one pixel border, your map has to be
a power of two in both dimensions....no exceptions.

You *might* get away with it in some (broken) OpenGL implementations - but
it's definitely not legal and if your OpenGL library doesn't report a
GL_INVALID_VALUE error when you do it - then there is a definite bug in
your OpenGL library because the specification of that functions says it
MUST produce that error.

---------------------------- Steve Baker -------------------------
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