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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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src
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util.c
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1996-11-11
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/*
* Copyright (c) 1994 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee,
* provided that (i) the above copyright notices and this permission
* notice appear in all copies of the software and related documentation,
* and (ii) the name of Silicon Graphics may not be used in any
* advertising or publicity relating to the software without the specific,
* prior written permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR ANY SPECIAL,
* INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
* OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
/*
* Misc utility routines.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <GL/gl.h>
#include "util.h"
float x_axis[] = { 1.0, 0.0, 0.0 };
float y_axis[] = { 0.0, 1.0, 0.0 };
float z_axis[] = { 0.0, 0.0, 1.0 };
float nx_axis[] = { -1.0, 0.0, 0.0 };
float ny_axis[] = { 0.0, -1.0, 0.0 };
float nz_axis[] = { 0.0, 0.0, -1.0 };
void norm(float v[3])
{
float r;
r = sqrt( v[0]*v[0] + v[1]*v[1] + v[2]*v[2] );
v[0] /= r;
v[1] /= r;
v[2] /= r;
}
float dot(float a[3], float b[3])
{
return (a[0]*b[0] + a[1]*b[1] + a[2]*b[2]);
}
void cross(float v1[3], float v2[3], float result[3])
{
result[0] = v1[1]*v2[2] - v1[2]*v2[1];
result[1] = v1[2]*v2[0] - v1[0]*v2[2];
result[2] = v1[0]*v2[1] - v1[1]*v2[0];
}
float length(float v[3])
{
float r = sqrt( v[0]*v[0] + v[1]*v[1] + v[2]*v[2] );
return r;
}
/*
* Returns: extension named 'name' is supported.
*/
GLboolean
getExtension(char *name)
{
const GLubyte *extensions;
extensions = glGetString(GL_EXTENSIONS);
if (extensions == NULL || *extensions == '\0')
return GL_FALSE;
return strstr(extensions, name) != 0;
}