Non-mipmapped textures don't work?

BlitzMax Forums/BlitzMax Programming/Non-mipmapped textures don't work?

teamonkey (Posted 2004) [#1]

Hi I'm loading in an image as a pixmap and converting it to a texture using bglTexFromPixmap. By default, mipmapping is set to on and I can display it OK on an OpenGL quad. If I turn mipmapping off for that texture it just displays as a white square. Is this happening for anyone else?

marksibly (Posted 2004) [#2]

Hi, You probably need to set the min and mag filters, eg: glBindTexture GL_TEXTURE_2D,my_tex glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST

ImaginaryHuman (Posted 2004) [#3]

Even if mipmapping is off?

marksibly (Posted 2004) [#4]

That's how you turn mipmapping off! The bglTexFromPixmap flags just determines whether mipmaps are built - not enabled.

teamonkey (Posted 2004) [#5]

Yeah that was it - I had the glTexParameteri lines before the glBindTexture. :/ GL_NEAREST for 2D quads looks rubbish on my machine. It distorts the textures ever so slightly in a way that is very noticable on a TFT. I thought it was the mipmapping, but using GL_LINEAR is a big improvement. I guess DrawImage uses GL_LINEAR?