Setting GL_UNPACK_ALIGNMENT to 1

Started by gd_sequoia, Mar 24 2012 06:04 AM

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#1 gd_sequoia Members - Reputation: 99

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Posted 24 March 2012 - 06:04 AM

I've been uploading a texture (glTexSubImage2D) and getting skewed results for upload-buffer sizes that are not a multiple of 4 (I think). Setting GL_UNPACK_ALIGNMENT to 1 fixes that, but is it a good idea? Likely to get me bad performance on certain hw?

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#2 swiftcoder Senior Moderators - Reputation: 4738

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Posted 24 March 2012 - 07:41 AM

Using a buffer size that isn't a multiple of 4 is liable to get you bad performance on quite a lot of hardware. I have one OpenGL application where the performance *doubles* when I add a dummy alpha-channel to pad my textures to 4 bytes/component...

Tristam MacDonald - SDE @ Amazon - swiftcoding [Need to sync your files via the cloud? | Need affordable web hosting?]

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