[Bug 97321] Query INFO_LOG_LENGTH for empty info log should return 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97321

--- Comment #17 from Ian Romanick <idr at freedesktop.org> ---
There has been a couple weeks of discussion about this inside Khronos (see
Khronos internal bug #16110).

A lot of the discussion focused on which option would be least likely to be
used incorrectly by developers.  Since glGetProgramInfoLog takes a maxLength
parameter, overruns should be unlikely.  I'm still not 100% comfortable with
it, but I can live with it.

The conclusion is as follows:

1. In the initial state, the info log is empty.  As of this writing, the spec
says there is "no info log."

2. If the info log is empty, the GL_INFO_LOG_LENGTH query should return 0.

3. If maxLength passed to glGetProgramInfoLog is > 0, the buffer pointed to by
infoLog will be NUL terminated even if GL_INFO_LOG_LENGTH returned 0.  The spec
be clarified to make this last point explicit.

Guess who gets to write CTS tests to exercise all of this behavior?  Yeah, I
do.

We should implement the behavior described by the pending spec changes.  I
believe this matches the expectations of the WebGL test referenced in comment
#2.

Tapani: Are you still available to do this?

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