GL mipmap question

[Stefan Dösinger]

Hi,
I'm trying to get the Mipmap example of the DX7 sdk running, and I've run into 
a problem:

OpenGL requires mipmap levels down to 1x1 (according to the red book), but 
DirectX can provide less levels, e.g. the smallest with 16x16. If I use such 
a mipmaped texture from d3d in opengl, this results in a white texture image. 
I've verified this with a GL-only program.

Is there any way to such a texture with opengl, or do I need other tricks? I 
could use gluBuild2DMipmaps() to create the smaller textures, but I dislike 
that way.

Stefan

[Stefan Dösinger]

Hi,
> OpenGL requires mipmap levels down to 1x1 (according to the red book), but
> DirectX can provide less levels, e.g. the smallest with 16x16. If I use
> such a mipmaped texture from d3d in opengl, this results in a white texture
> image. I've verified this with a GL-only program.

Never mind that, I just forgot to reduce the texture size for heigher levels. 
Now the mipmap example works fine. I don't know why my OpenGL test failed.