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mutter-performance-source/cogl/cogl-vector.c
Robert Bragg a0441778ad This re-licenses Cogl 1.18 under the MIT license
Since the Cogl 1.18 branch is actively maintained in parallel with the
master branch; this is a counter part to commit 1b83ef938fc16b which
re-licensed the master branch to use the MIT license.

This re-licensing is a follow up to the proposal that was sent to the
Cogl mailing list:
http://lists.freedesktop.org/archives/cogl/2013-December/001465.html

Note: there was a copyright assignment policy in place for Clutter (and
therefore Cogl which was part of Clutter at the time) until the 11th of
June 2010 and so we only checked the details after that point (commit
0bbf50f905)

For each file, authors were identified via this Git command:
$ git blame -p -C -C -C20 -M -M10  0bbf50f905..HEAD

We received blanket approvals for re-licensing all Red Hat and Collabora
contributions which reduced how many people needed to be contacted
individually:
- http://lists.freedesktop.org/archives/cogl/2013-December/001470.html
- http://lists.freedesktop.org/archives/cogl/2014-January/001536.html

Individual approval requests were sent to all the other identified authors
who all confirmed the re-license on the Cogl mailinglist:
http://lists.freedesktop.org/archives/cogl/2014-January

As well as updating the copyright header in all sources files, the
COPYING file has been updated to reflect the license change and also
document the other licenses used in Cogl such as the SGI Free Software
License B, version 2.0 and the 3-clause BSD license.

This patch was not simply cherry-picked from master; but the same
methodology was used to check the source files.
2014-02-22 02:02:53 +00:00

300 lines
6.4 KiB
C

/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2010 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <cogl-util.h>
#include <cogl-vector.h>
#include <glib.h>
#include <math.h>
#include <string.h>
#define X 0
#define Y 1
#define Z 2
#define W 3
void
cogl_vector3_init (float *vector, float x, float y, float z)
{
vector[X] = x;
vector[Y] = y;
vector[Z] = z;
}
void
cogl_vector3_init_zero (float *vector)
{
memset (vector, 0, sizeof (float) * 3);
}
CoglBool
cogl_vector3_equal (const void *v1, const void *v2)
{
float *vector0 = (float *)v1;
float *vector1 = (float *)v2;
_COGL_RETURN_VAL_IF_FAIL (v1 != NULL, FALSE);
_COGL_RETURN_VAL_IF_FAIL (v2 != NULL, FALSE);
/* There's no point picking an arbitrary epsilon that's appropriate
* for comparing the components so we just use == that will at least
* consider -0 and 0 to be equal. */
return
vector0[X] == vector1[X] &&
vector0[Y] == vector1[Y] &&
vector0[Z] == vector1[Z];
}
CoglBool
cogl_vector3_equal_with_epsilon (const float *vector0,
const float *vector1,
float epsilon)
{
_COGL_RETURN_VAL_IF_FAIL (vector0 != NULL, FALSE);
_COGL_RETURN_VAL_IF_FAIL (vector1 != NULL, FALSE);
if (fabsf (vector0[X] - vector1[X]) < epsilon &&
fabsf (vector0[Y] - vector1[Y]) < epsilon &&
fabsf (vector0[Z] - vector1[Z]) < epsilon)
return TRUE;
else
return FALSE;
}
float *
cogl_vector3_copy (const float *vector)
{
if (vector)
return g_slice_copy (sizeof (float) * 3, vector);
return NULL;
}
void
cogl_vector3_free (float *vector)
{
g_slice_free1 (sizeof (float) * 3, vector);
}
void
cogl_vector3_invert (float *vector)
{
vector[X] = -vector[X];
vector[Y] = -vector[Y];
vector[Z] = -vector[Z];
}
void
cogl_vector3_add (float *result,
const float *a,
const float *b)
{
result[X] = a[X] + b[X];
result[Y] = a[Y] + b[Y];
result[Z] = a[Z] + b[Z];
}
void
cogl_vector3_subtract (float *result,
const float *a,
const float *b)
{
result[X] = a[X] - b[X];
result[Y] = a[Y] - b[Y];
result[Z] = a[Z] - b[Z];
}
void
cogl_vector3_multiply_scalar (float *vector,
float scalar)
{
vector[X] *= scalar;
vector[Y] *= scalar;
vector[Z] *= scalar;
}
void
cogl_vector3_divide_scalar (float *vector,
float scalar)
{
float one_over_scalar = 1.0f / scalar;
vector[X] *= one_over_scalar;
vector[Y] *= one_over_scalar;
vector[Z] *= one_over_scalar;
}
void
cogl_vector3_normalize (float *vector)
{
float mag_squared =
vector[X] * vector[X] +
vector[Y] * vector[Y] +
vector[Z] * vector[Z];
if (mag_squared > 0.0f)
{
float one_over_mag = 1.0f / sqrtf (mag_squared);
vector[X] *= one_over_mag;
vector[Y] *= one_over_mag;
vector[Z] *= one_over_mag;
}
}
float
cogl_vector3_magnitude (const float *vector)
{
return sqrtf (vector[X] * vector[X] +
vector[Y] * vector[Y] +
vector[Z] * vector[Z]);
}
void
cogl_vector3_cross_product (float *result,
const float *a,
const float *b)
{
float tmp[3];
tmp[X] = a[Y] * b[Z] - a[Z] * b[Y];
tmp[Y] = a[Z] * b[X] - a[X] * b[Z];
tmp[Z] = a[X] * b[Y] - a[Y] * b[X];
result[X] = tmp[X];
result[Y] = tmp[Y];
result[Z] = tmp[Z];
}
float
cogl_vector3_dot_product (const float *a, const float *b)
{
return a[X] * b[X] + a[Y] * b[Y] + a[Z] * b[Z];
}
float
cogl_vector3_distance (const float *a, const float *b)
{
float dx = b[X] - a[X];
float dy = b[Y] - a[Y];
float dz = b[Z] - a[Z];
return sqrtf (dx * dx + dy * dy + dz * dz);
}
#if 0
void
cogl_vector4_init (float *vector, float x, float y, float z)
{
vector[X] = x;
vector[Y] = y;
vector[Z] = z;
vector[W] = w;
}
void
cogl_vector4_init_zero (float *vector)
{
memset (vector, 0, sizeof (CoglVector4));
}
void
cogl_vector4_init_from_vector4 (float *vector, float *src)
{
*vector4 = *src;
}
CoglBool
cogl_vector4_equal (const void *v0, const void *v1)
{
_COGL_RETURN_VAL_IF_FAIL (v1 != NULL, FALSE);
_COGL_RETURN_VAL_IF_FAIL (v2 != NULL, FALSE);
return memcmp (v1, v2, sizeof (float) * 4) == 0 ? TRUE : FALSE;
}
float *
cogl_vector4_copy (float *vector)
{
if (vector)
return g_slice_dup (CoglVector4, vector);
return NULL;
}
void
cogl_vector4_free (float *vector)
{
g_slice_free (CoglVector4, vector);
}
void
cogl_vector4_invert (float *vector)
{
vector.x = -vector.x;
vector.y = -vector.y;
vector.z = -vector.z;
vector.w = -vector.w;
}
void
cogl_vector4_add (float *result,
float *a,
float *b)
{
result.x = a.x + b.x;
result.y = a.y + b.y;
result.z = a.z + b.z;
result.w = a.w + b.w;
}
void
cogl_vector4_subtract (float *result,
float *a,
float *b)
{
result.x = a.x - b.x;
result.y = a.y - b.y;
result.z = a.z - b.z;
result.w = a.w - b.w;
}
void
cogl_vector4_divide (float *vector,
float scalar)
{
float one_over_scalar = 1.0f / scalar;
result.x *= one_over_scalar;
result.y *= one_over_scalar;
result.z *= one_over_scalar;
result.w *= one_over_scalar;
}
#endif