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desktop-main.cpp: round the fractional part of the GL version

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When verMinor is extracted with the glGetString() method,
use roundf() to round the GL MINOR version to an integer.

2.1 is split in 2 and 1.

Without this patch rounding issues are present as for 32bit IEEE
the default rounding makes (0.1f * 10.f) into 0.999999f.

Given the MINOR is a single digit for GL, calling roundf() on
0.999999 gives the expected result 1 for the MINOR.

Reported-by: Murillo Fernandes Bernardes <notifications@github.com>
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2017-11-02 17:58:56 +02:00
parent 28299b0ebc
commit 6bab8267eb
1 changed files with 1 additions and 1 deletions
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2
subsurface-desktop-main.cpp
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@ -190,7 +190,7 @@ void validateGL()
}
if (sscanf(verChar, "%f", &verFloat) == 1) {
verMajor = (GLint)verFloat;
verMinor = (GLint)((verFloat - verMajor) * 10.f);
verMinor = (GLint)roundf((verFloat - verMajor) * 10.f);
}
}
// attempt to detect version using the newer API