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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010 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, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "cogl.h"
#include "cogl-fixed.h"
#include "cogl-internal.h"
#include "cogl-pipeline.h"
#include "cogl-offscreen.h"
#include "cogl-shader.h"
#include "cogl-texture.h"
#include "cogl-types.h"
#include "cogl-util.h"
/*
* cogl_util_next_p2:
* @a: Value to get the next power of two
*
* Calculates the next power of two greater than or equal to @a.
*
* Return value: @a if @a is already a power of two, otherwise returns
* the next nearest power of two.
*/
int
_cogl_util_next_p2 (int a)
{
int rval = 1;
while (rval < a)
rval <<= 1;
return rval;
}
/* gtypes */
/*
* CoglFixed
*/
static GTypeInfo _info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
static GTypeFundamentalInfo _finfo = { 0, };
static void
cogl_value_init_fixed (GValue *value)
{
value->data[0].v_int = 0;
}
static void
cogl_value_copy_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = src->data[0].v_int;
}
static char *
cogl_value_collect_fixed (GValue *value,
unsigned int n_collect_values,
GTypeCValue *collect_values,
unsigned int collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
return NULL;
}
static char *
cogl_value_lcopy_fixed (const GValue *value,
unsigned int n_collect_values,
GTypeCValue *collect_values,
unsigned int collect_flags)
{
gint32 *fixed_p = collect_values[0].v_pointer;
if (!fixed_p)
return g_strdup_printf ("value location for '%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*fixed_p = value->data[0].v_int;
return NULL;
}
static void
cogl_value_transform_fixed_int (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_TO_INT (src->data[0].v_int);
}
static void
cogl_value_transform_fixed_double (const GValue *src,
GValue *dest)
{
dest->data[0].v_double = COGL_FIXED_TO_DOUBLE (src->data[0].v_int);
}
static void
cogl_value_transform_fixed_float (const GValue *src,
GValue *dest)
{
dest->data[0].v_float = COGL_FIXED_TO_FLOAT (src->data[0].v_int);
}
static void
cogl_value_transform_int_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_INT (src->data[0].v_int);
}
static void
cogl_value_transform_double_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_DOUBLE (src->data[0].v_double);
}
static void
cogl_value_transform_float_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_FLOAT (src->data[0].v_float);
}
static const GTypeValueTable _cogl_fixed_value_table = {
cogl_value_init_fixed,
NULL,
cogl_value_copy_fixed,
NULL,
"i",
cogl_value_collect_fixed,
"p",
cogl_value_lcopy_fixed
};
GType
cogl_fixed_get_type (void)
{
static GType _cogl_fixed_type = 0;
if (G_UNLIKELY (_cogl_fixed_type == 0))
{
_info.value_table = & _cogl_fixed_value_table;
_cogl_fixed_type =
g_type_register_fundamental (g_type_fundamental_next (),
g_intern_static_string ("CoglFixed"),
&_info, &_finfo, 0);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_INT,
cogl_value_transform_fixed_int);
g_value_register_transform_func (G_TYPE_INT, _cogl_fixed_type,
cogl_value_transform_int_fixed);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_FLOAT,
cogl_value_transform_fixed_float);
g_value_register_transform_func (G_TYPE_FLOAT, _cogl_fixed_type,
cogl_value_transform_float_fixed);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_DOUBLE,
cogl_value_transform_fixed_double);
g_value_register_transform_func (G_TYPE_DOUBLE, _cogl_fixed_type,
cogl_value_transform_double_fixed);
}
return _cogl_fixed_type;
}
unsigned int
_cogl_util_one_at_a_time_mix (unsigned int hash)
{
hash += ( hash << 3 );
hash ^= ( hash >> 11 );
hash += ( hash << 15 );
return hash;
}
/* The 'ffs' function is part of C99 so it isn't always available */
#ifndef HAVE_FFS
int
_cogl_util_ffs (int num)
{
int i = 1;
if (num == 0)
return 0;
while ((num & 1) == 0)
{
num >>= 1;
i++;
}
return i;
}
#endif /* HAVE_FFS */
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