[Mesa-dev] [Bug 89586] Drivers/DRI/swrast

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89586

--- Comment #37 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Dan Sebald from comment #36)
> What is the general thought regarding floating point numerical issues and
> the OpenGL formulas?

In early GLSL versions, floating point accuracy was supposed to be to within
0.1 (i.e. pretty huge errors were allowable). However if the hw were to start
introducing such errors left and right, it'd wreak huge havoc... with
ARB_shader_precision (part of GL 4.1), it specifies these things fairly
precisely.

Not sure how that carries over to the glPixelZoom-style formulas.

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