mirror of
https://github.com/brl/mutter.git
synced 2024-11-23 00:20:42 -05:00
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
|
/*
|
||
|
|
* Cogl
|
||
|
|
*
|
||
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
||
|
|
*
|
||
|
|
* Copyright (C) 2011 Intel Corporation.
|
||
|
|
*
|
||
|
|
* This library is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This library is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with this library; if not, write to the
|
||
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
|
|
* Boston, MA 02111-1307, USA.
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Neil Roberts <neil@linux.intel.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __COGL_FLAGS_H
|
||
|
|
#define __COGL_FLAGS_H
|
||
|
|
|
||
|
|
#include <glib.h>
|
||
|
|
|
||
|
|
G_BEGIN_DECLS
|
||
|
|
|
||
|
|
/* These are macros used to implement a fixed-size array of bits. This
|
||
|
|
should be used instead of CoglBitmask when the maximum bit number
|
||
|
|
that will be set is known at compile time, for example when setting
|
||
|
|
for recording a set of known available features */
|
||
|
|
|
||
|
|
/* The bits are stored in an array of unsigned ints. It would probably
|
||
|
|
make sense to use unsigned long instead because then on 64-bit
|
||
|
|
systems where it can handle 64-bits just as easily and it can test
|
||
|
|
more bits. However GDebugKey uses a guint for the mask and we need
|
||
|
|
to fit the masks into this */
|
||
|
|
|
||
|
|
/* To use these macros, you would typically have an enum defining the
|
||
|
|
available bits with an extra last enum to define the maximum
|
||
|
|
value. Then to store the flags you would declare an array of
|
||
|
|
unsigned ints sized using COGL_FLAGS_N_INTS_FOR_SIZE, eg:
|
||
|
|
|
||
|
|
typedef enum { FEATURE_A, FEATURE_B, FEATURE_C, N_FEATURES } Features;
|
||
|
|
|
||
|
|
unsigned int feature_flags[COGL_FLAGS_N_INTS_FOR_SIZE (N_FEATURES)];
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define COGL_FLAGS_N_INTS_FOR_SIZE(size) \
|
||
|
|
(((size) + \
|
||
|
|
(sizeof (unsigned int) * 8 - 1)) \
|
||
|
|
/ (sizeof (unsigned int) * 8))
|
||
|
|
|
||
|
|
/* @flag is expected to be constant so these should result in a
|
||
|
|
constant expression. This means that setting a flag is equivalent
|
||
|
|
to just setting in a bit in a global variable at a known
|
||
|
|
location */
|
||
|
|
#define COGL_FLAGS_GET_INDEX(flag) \
|
||
|
|
((flag) / (sizeof (unsigned int) * 8))
|
||
|
|
#define COGL_FLAGS_GET_MASK(flag) \
|
||
|
|
(1U << ((unsigned int) (flag) & \
|
||
|
|
(sizeof (unsigned int) * 8 - 1)))
|
||
|
|
|
||
|
|
#define COGL_FLAGS_GET(array, flag) \
|
||
|
|
(!!((array)[COGL_FLAGS_GET_INDEX (flag)] & \
|
||
|
|
COGL_FLAGS_GET_MASK (flag)))
|
||
|
|
|
||
|
|
/* The expectation here is that @value will be constant so the if
|
||
|
|
statement will be optimised out */
|
||
|
|
#define COGL_FLAGS_SET(array, flag, value) \
|
||
|
|
G_STMT_START { \
|
||
|
|
if (value) \
|
||
|
|
((array)[COGL_FLAGS_GET_INDEX (flag)] |= \
|
||
|
|
COGL_FLAGS_GET_MASK (flag)); \
|
||
|
|
else \
|
||
|
|
((array)[COGL_FLAGS_GET_INDEX (flag)] &= \
|
||
|
|
~COGL_FLAGS_GET_MASK (flag)); \
|
||
|
|
} G_STMT_END
|
||
|
|
|
||
|
|
G_END_DECLS
|
||
|
|
|
||
|
|
#endif /* __COGL_FLAGS_H */
|
||
|
|
|