MipMapping troubles

OpenGL OpenGL: Advanced Coding
1

I have enabled mipmapping, but up close the texture looks wrong

It should be

I am using
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );

Thanks in advance for any help…

2

this is not really “advanced” opengl, this is more beginner questions.

You are wrong, mipmapping is enabled with :
(with trilinear filtering, come on, we are in 2007)

glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

then the mag filter should be bilinear :
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

And about your rgb stripes
on your texture it looks like you did not upload it correctly.

3

Sorry - I did not post enough info -

When I render the texture without mipmapping, it appears fine up close (no rgb colors). But when viewing from a far it looks poor - lots of aliasing of the lines.

When I render with mipmapping, the aliasing goes away, but I get strange rgb stripes up close.

I am generating mipmaps with:
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, w, h, GL_RGB, GL_UNSIGNED_BYTE, image->pixels );

and rendering with (thanks for the trilinear tip):
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

Why do I get strange RGB lines when rendering with mipmapping enabled?

Thanks again for any help…

4

I solved it.

It was my own error.

Format should have been GL_RGBA
gluBuild2DMipmaps( GL_TEXTURE_2D, 4, w, h, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels );

Thanks for your help…