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kannan622 / min3d

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GL_GENERATE_MIPMAP generates a white texture #21

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
I was about to add mipmapping to my app and took a look at the Example. On my 
Motorola Milestone (international version of the Droid) the cube with 
mipmapping enabled is completely white.

Original issue reported on code.google.com by nienhs on 10 Nov 2010 at 10:40

GoogleCodeExporter commented 9 years ago 
It seems some devices don't support GL_GENERATE_MIPMAP, even though they claim 
support for GL 1.1.
Mike Miller came up with a simple solution to create them yourself. I couldn't 
find the original publication, but it's discussed in 
http://insanitydesign.com/wp/2009/08/01/android-opengl-es-mipmaps/.

I just added the new buildMipMap() method to Renderer.java and changed 
uploadTextureAndReturnId() to use it to generate MipMaps. As an added bonus 
this should also work on devices that don't support GL 1.1 at all.

The attached files just contain the two methods mentioned above.

Original comment by nienhs on 11 Nov 2010 at 2:53

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GoogleCodeExporter commented 9 years ago 
I would add that in my experience, to make this work must be given all the 
mipmap levels from 0 to n, where n is the texture size equal to 1

In addition, when it comes to the texture atlas, there may be white texture. 
Therefore, should also generate all the mipmaps every time you add a new 
texture to the atlas. Otherwise will be a problem.

And in my case, the best function to send texture is GLU.glTexImage..

sorry for my english :).

Original comment by m3g...@gmail.com on 21 Apr 2011 at 4:37