mirror of
https://github.com/shawns-valve/halflife.git
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102 lines
1.7 KiB
C++
102 lines
1.7 KiB
C++
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/***
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*
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* Copyright (c) 1999, 2000 Valve LLC. All rights reserved.
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*
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* This product contains software technology licensed from Id
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* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
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* All Rights Reserved.
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*
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* Use, distribution, and modification of this source code and/or resulting
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* object code is restricted to non-commercial enhancements to products from
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* Valve LLC. All other use, distribution, or modification is prohibited
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* without written permission from Valve LLC.
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*
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****/
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//
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// util.cpp
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//
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// implementation of class-less helper functions
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//
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#include "stdio.h"
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#include "stdlib.h"
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#include "math.h"
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#include "hud.h"
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#include "cl_util.h"
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#include <string.h>
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vec3_t vec3_origin( 0, 0, 0 );
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double sqrt(double x);
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float Length(const float *v)
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{
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int i;
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float length;
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length = 0;
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for (i=0 ; i< 3 ; i++)
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length += v[i]*v[i];
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length = sqrt (length); // FIXME
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return length;
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}
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float VectorNormalize (float *v)
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{
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float length, ilength;
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length = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];
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length = sqrt (length); // FIXME
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if (length)
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{
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ilength = 1/length;
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v[0] *= ilength;
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v[1] *= ilength;
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v[2] *= ilength;
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}
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return length;
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}
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void VectorInverse ( float *v )
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{
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v[0] = -v[0];
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v[1] = -v[1];
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v[2] = -v[2];
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}
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void VectorScale (const float *in, float scale, float *out)
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{
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out[0] = in[0]*scale;
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out[1] = in[1]*scale;
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out[2] = in[2]*scale;
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}
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void VectorMA (const float *veca, float scale, const float *vecb, float *vecc)
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{
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vecc[0] = veca[0] + scale*vecb[0];
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vecc[1] = veca[1] + scale*vecb[1];
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vecc[2] = veca[2] + scale*vecb[2];
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}
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HSPRITE LoadSprite(const char *pszName)
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{
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int i;
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char sz[256];
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if (ScreenWidth < 640)
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i = 320;
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else
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i = 640;
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sprintf(sz, pszName, i);
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return SPR_Load(sz);
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}
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