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79acb088e7
Since using addresses that might change is something that finally the FSF acknowledge as a plausible scenario (after changing address twice), the license blurb in the source files should use the URI for getting the license in case the library did not come with it. Not that URIs cannot possibly change, but at least it's easier to set up a redirection at the same place. As a side note: this commit closes the oldes bug in Clutter's bug report tool. http://bugzilla.openedhand.com/show_bug.cgi?id=521
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_UTIL_H
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#define __COGL_UTIL_H
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#include <glib.h>
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#include <math.h>
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int
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cogl_util_next_p2 (int a);
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/* The signbit macro is defined by ISO C99 so it should be available,
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however if it's not we can fallback to an evil hack */
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#ifdef signbit
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#define cogl_util_float_signbit(x) signbit(x)
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#else
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/* This trick was stolen from here:
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http://lists.boost.org/Archives/boost/2006/08/108731.php
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It xors the integer reinterpretations of -1.0f and 1.0f. In theory
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they should only differ by the signbit so that gives a mask for the
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sign which we can just test against the value */
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static inline gboolean
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cogl_util_float_signbit (float x)
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{
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static const union { float f; guint32 i; } negative_one = { -1.0f };
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static const union { float f; guint32 i; } positive_one = { +1.0f };
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union { float f; guint32 i; } value = { x };
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return !!((negative_one.i ^ positive_one.i) & value.i);
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}
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#endif
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/* This is a replacement for the nearbyint function which always
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rounds to the nearest integer. nearbyint is apparently a C99
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function so it might not always be available but also it seems in
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glibc it is defined as a function call so this macro could end up
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faster anyway. We can't just add 0.5f because it will break for
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negative numbers. */
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#define COGL_UTIL_NEARBYINT(x) ((int) ((x) < 0.0f ? (x) - 0.5f : (x) + 0.5f))
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#endif /* __COGL_UTIL_H */
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