http://bugs.freedesktop.org/show_bug.cgi?id=11877





--- Comment #15 from Zou Nan hai <[EMAIL PROTECTED]>  2008-03-18 20:11:54 PST 
---
Brian, that is because in _mesa_get_teximage sGRB texture is get by direct
memcpy without pixel transfer. 
For of hardware limit SRGB is transfered to SRGBA format on 965.

If you modify the testcase to use GL_RGBA to get the image but GL_SRGB_EXT to
store the image, you will see the same issue in software rendering.

To fix the issue, maybe we need something like add FetchTex2fRaw interface for
TexImage. 


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