e28d1fe916
There are some real bugs in here, but we're drowning in warnings. Change-Id: I7c2c0eafc8426327521bdd8a3ac2d3742ac16864
170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// mathlib.h
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//Dan East:
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#include "FixedPointMath.h"
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#ifdef USE_PQ_OPT
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typedef int fpvec3[3];
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#endif
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typedef fixedpoint_t vec3_FPM_t[3];
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typedef fixedpoint8_24_t vec3_8_24FPM_t[3];
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typedef fixedpoint_t vec5_FPM_t[5];
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//End Dan
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typedef float vec_t;
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typedef vec_t vec3_t[3];
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typedef vec_t vec5_t[5];
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typedef int fixed4_t;
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typedef int fixed8_t;
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typedef int fixed16_t;
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#ifndef M_PI
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#define M_PI 3.14159265358979323846 // matches value in gcc v2 math.h
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#endif
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struct mplane_s;
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extern vec3_t vec3_origin;
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extern int nanmask;
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#define IS_NAN(x) (((*(int *)&x)&nanmask)==nanmask)
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#define DotProduct(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2])
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#define VectorSubtract(a,b,c) {c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];}
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#define VectorAdd(a,b,c) {c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];}
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#define VectorCopy(a,b) {b[0]=a[0];b[1]=a[1];b[2]=a[2];}
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void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t vecc);
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vec_t _DotProduct (vec3_t v1, vec3_t v2);
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void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out);
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void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out);
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void _VectorCopy (vec3_t in, vec3_t out);
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int VectorCompare (vec3_t v1, vec3_t v2);
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vec_t Length (vec3_t v);
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void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
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//void VectorNormalizeNoRet (vec3_t v); // uses finvsqrt
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//float VectorNormalize (vec3_t v); // returns vector length
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wstrict-aliasing"
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static inline float InvSqrt( float number ) {
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long i;
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float x2, y;
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const float threehalfs = 1.5F;
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x2 = number * 0.5F;
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y = number;
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i = * ( long * ) &y; // evil floating point bit level hacking
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i = 0x5f3759df - ( i >> 1 ); // what the fuck?
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y = * ( float * ) &i;
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y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration
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// y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removed
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return y;
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}
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#pragma GCC diagnostic pop
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static inline void VectorNormalizeNoRet (vec3_t v)
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{
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float length, ilength;
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ilength = InvSqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
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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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static inline float VectorNormalize (vec3_t 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 (vec3_t v);
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//void VectorScale (vec3_t in, vec_t scale, vec3_t out);
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static inline void VectorInverse (vec3_t 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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static inline void VectorScale (vec3_t in, vec_t scale, vec3_t 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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int Q_log2(int val);
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void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3]);
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void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4]);
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void FloorDivMod (double numer, double denom, int *quotient,
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int *rem);
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fixed16_t Invert24To16(fixed16_t val);
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int GreatestCommonDivisor (int i1, int i2);
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void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);
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int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane);
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float anglemod(float a);
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#define BOX_ON_PLANE_SIDE(emins, emaxs, p) \
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(((p)->type < 3)? \
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( \
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((p)->dist <= (emins)[(p)->type])? \
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1 \
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: \
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( \
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((p)->dist >= (emaxs)[(p)->type])?\
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2 \
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: \
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3 \
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) \
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) \
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: \
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BoxOnPlaneSide( (emins), (emaxs), (p)))
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