mirror of
https://github.com/brl/mutter.git
synced 2024-11-26 01:50:42 -05:00
f4c1ba9ed9
Previously cogl-flags was using an array of ints to store the flags. There was a comment saying that it would be nice to use longs but this is awkward because g_parse_debug_flags can only work in ints. This is a silly reason not to use longs because we can just parse multiple sets of flags per long. This patch therefore changes cogl-flags to use longs and tweaks the debug key parsing code. Reviewed-by: Robert Bragg <robert@linux.intel.com>
85 lines
3.0 KiB
C
85 lines
3.0 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 longs. 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 longs sized
|
|
using COGL_FLAGS_N_LONGS_FOR_SIZE, eg:
|
|
|
|
typedef enum { FEATURE_A, FEATURE_B, FEATURE_C, N_FEATURES } Features;
|
|
|
|
unsigned long feature_flags[COGL_FLAGS_N_LONGS_FOR_SIZE (N_FEATURES)];
|
|
*/
|
|
|
|
#define COGL_FLAGS_N_LONGS_FOR_SIZE(size) \
|
|
(((size) + \
|
|
(sizeof (unsigned long) * 8 - 1)) \
|
|
/ (sizeof (unsigned long) * 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 long) * 8))
|
|
#define COGL_FLAGS_GET_MASK(flag) \
|
|
(1UL << ((unsigned long) (flag) & \
|
|
(sizeof (unsigned long) * 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 */
|
|
|