[Piglit] [PATCH 1/9] util: Make piglit_probe_rect_halves_equal_rgba() GLES-compatible

[Eric Anholt]

Chad Versace <chad.versace at linux.intel.com> writes:

> In GLES, glReadPixels does not accept format=GL_FLOAT, but it does accept
> format=GL_BYTE.
>
> This shouldn't make any tests begin failing. If anything, this commit may
> make pass some almost-passing tests because there is less precision in
> probing with glReadPixels(GL_BYTE) than glReadPixels(GL_FLOAT).

Choosing to compare with bytes should be based on the type/size of the
renderbuffer's channels, imo.
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