Re: [Mesa3d-dev] s_texture.c

[Daniel V. <vo...@lo...>]

On Thu, Dec 14, 2000 at 10:16:58AM -0700, Brian Paul wrote:
> 
> Are you settting GL_TEXTURE_BASE_LEVEL?

No, I only set GL_TEXTURE_MAX_LEVEL and cut off the last two mip levels.
It also looks like the filters use the wrong base mipmap. Everything
looks overblurry from an angle and a naive guess would be that it's
taking everything 2 levels too far down.

> I think I see an error in the calculation in _P.  I think I should
> add the base level to it.  However, that would increase _P.

from mtypes.h:

   GLint _P;			/* Highest mipmap level */
   GLfloat _M;			/* = MIN(MaxLevel, P) - BaseLevel */

What do _P and _M actually mean? Is _P the highest mip level based on
the size of the image (e.g. 5 for 32x32) and _M supposed to be the one
after "clipping"?



                            Daniel Vogel, Programmer, Loki Software Inc.