[Bug 108805] i965 regressions from EXT_texture_sRGB_R8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108805

--- Comment #7 from Gert Wollny <gw.fossdev at gmail.com> ---
Created attachment 142534
  --> https://bugs.freedesktop.org/attachment.cgi?id=142534&action=edit
proposed fix for sRGB-R8 regressions

This patch contains two chunks: 
- Only set swizzle for GL_RED and GL_RG when the format is GL_UNSIGNED_BYTE,
this should fix the piglit failure. 

- add a code path to report INCOMPLETE_ATTACHMENT for MESA_FORMAT_R_SRGB8 and
report UNSUPPORTED otherwise. This should fix the KHR regressions and still
keep dEQP-GLES3 happy.

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