Diagnosing OpenGL ES issues

[stuart_george]

I'm trying to create a simple application that renders a background texture using OpenGL ES (I've used the Slideshow example as a basis). The texture (or at least the bitmap) is being successfully loaded, but the output only white.

The texture is 512x512, glGetError returns GL_NO_ERROR after glBindTexture, glVertexPointer, glTexCoordPointer and glDrawArrays.

What is the best way to diagnose the problem?

(As an alternative, I'm willing to dump my entire codebase if there is a better, working, template to work against)

Many thanks,
Stuart

[Maveric]

Hello there, stuart_george!


Just checking, can you tell me if you use e.g. bgImage = Bitmap.createBitmap do you have width height of POW2 and maybe non-POW values...?



Best Regards,

[stuart_george]

Hi Marko,

I'm using CTextureManager from the OpenGL samples to load the texture. CTextureManager appears to be using CImageDecoder::FileNewL, ::FrameInfo and ::Convert to load the bitmaps.

The texture is 512x512 (I resized it because I vaguely remembered OpenGL having a POW2 texture restriction).

Any thoughts to what could be the problem or how to diagnose it? Alternatively, if there's a simpler working code example around that'd be handy too

Thanks,
Stuart