mirror of
https://github.com/Shpoike/Quakespasm.git
synced 2024-11-10 15:31:39 +00:00
301ff71325
the fitz engine doesn't use them at all. git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@364 af15c1b1-3010-417e-b628-4374ebc0bcbd
517 lines
11 KiB
C
517 lines
11 KiB
C
/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2002-2009 John Fitzgibbons and others
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Copyright (C) 2007-2008 Kristian Duske
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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.c -- math primitives
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#include "quakedef.h"
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vec3_t vec3_origin = {0,0,0};
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/*-----------------------------------------------------------------*/
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//#define DEG2RAD( a ) ( a * M_PI ) / 180.0F
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#define DEG2RAD( a ) ( (a) * M_PI_DIV_180 ) //johnfitz
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void ProjectPointOnPlane( vec3_t dst, const vec3_t p, const vec3_t normal )
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{
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float d;
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vec3_t n;
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float inv_denom;
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inv_denom = 1.0F / DotProduct( normal, normal );
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d = DotProduct( normal, p ) * inv_denom;
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n[0] = normal[0] * inv_denom;
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n[1] = normal[1] * inv_denom;
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n[2] = normal[2] * inv_denom;
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dst[0] = p[0] - d * n[0];
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dst[1] = p[1] - d * n[1];
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dst[2] = p[2] - d * n[2];
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}
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/*
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** assumes "src" is normalized
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*/
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void PerpendicularVector( vec3_t dst, const vec3_t src )
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{
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int pos;
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int i;
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float minelem = 1.0F;
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vec3_t tempvec;
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/*
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** find the smallest magnitude axially aligned vector
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*/
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for ( pos = 0, i = 0; i < 3; i++ )
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{
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if ( fabs( src[i] ) < minelem )
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{
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pos = i;
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minelem = fabs( src[i] );
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}
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}
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tempvec[0] = tempvec[1] = tempvec[2] = 0.0F;
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tempvec[pos] = 1.0F;
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/*
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** project the point onto the plane defined by src
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*/
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ProjectPointOnPlane( dst, tempvec, src );
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/*
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** normalize the result
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*/
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VectorNormalize( dst );
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}
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//johnfitz -- removed RotatePointAroundVector() becuase it's no longer used and my compiler fucked it up anyway
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/*-----------------------------------------------------------------*/
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float anglemod(float a)
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{
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#if 0
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if (a >= 0)
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a -= 360*(int)(a/360);
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else
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a += 360*( 1 + (int)(-a/360) );
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#endif
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a = (360.0/65536) * ((int)(a*(65536/360.0)) & 65535);
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return a;
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}
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/*
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==================
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BOPS_Error
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Split out like this for ASM to call.
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==================
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*/
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void BOPS_Error (void) __attribute__((__noreturn__));
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void BOPS_Error (void)
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{
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Sys_Error ("BoxOnPlaneSide: Bad signbits");
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}
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/*
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==================
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BoxOnPlaneSide
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Returns 1, 2, or 1 + 2
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==================
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*/
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int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, mplane_t *p)
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{
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float dist1, dist2;
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int sides;
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#if 0 // this is done by the BOX_ON_PLANE_SIDE macro before calling this
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// function
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// fast axial cases
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if (p->type < 3)
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{
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if (p->dist <= emins[p->type])
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return 1;
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if (p->dist >= emaxs[p->type])
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return 2;
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return 3;
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}
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#endif
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// general case
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switch (p->signbits)
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{
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case 0:
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dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
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dist2 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
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break;
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case 1:
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dist1 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
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dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
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break;
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case 2:
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dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
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dist2 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
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break;
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case 3:
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dist1 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
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dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
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break;
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case 4:
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dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
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dist2 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
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break;
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case 5:
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dist1 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
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dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
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break;
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case 6:
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dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
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dist2 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
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break;
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case 7:
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dist1 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
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dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
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break;
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default:
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dist1 = dist2 = 0; // shut up compiler
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BOPS_Error ();
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break;
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}
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#if 0
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int i;
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vec3_t corners[2];
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for (i=0 ; i<3 ; i++)
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{
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if (plane->normal[i] < 0)
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{
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corners[0][i] = emins[i];
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corners[1][i] = emaxs[i];
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}
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else
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{
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corners[1][i] = emins[i];
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corners[0][i] = emaxs[i];
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}
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}
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dist = DotProduct (plane->normal, corners[0]) - plane->dist;
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dist2 = DotProduct (plane->normal, corners[1]) - plane->dist;
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sides = 0;
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if (dist1 >= 0)
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sides = 1;
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if (dist2 < 0)
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sides |= 2;
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#endif
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sides = 0;
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if (dist1 >= p->dist)
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sides = 1;
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if (dist2 < p->dist)
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sides |= 2;
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#ifdef PARANOID
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if (sides == 0)
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Sys_Error ("BoxOnPlaneSide: sides==0");
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#endif
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return sides;
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}
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//johnfitz -- the opposite of AngleVectors. this takes forward and generates pitch yaw roll
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//TODO: take right and up vectors to properly set yaw and roll
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void VectorAngles (const vec3_t forward, vec3_t angles)
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{
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vec3_t temp;
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temp[0] = forward[0];
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temp[1] = forward[1];
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temp[2] = 0;
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angles[PITCH] = -atan2(forward[2], VectorLength(temp)) / M_PI_DIV_180;
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angles[YAW] = atan2(forward[1], forward[0]) / M_PI_DIV_180;
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angles[ROLL] = 0;
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}
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void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up)
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{
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float angle;
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float sr, sp, sy, cr, cp, cy;
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angle = angles[YAW] * (M_PI*2 / 360);
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sy = sin(angle);
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cy = cos(angle);
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angle = angles[PITCH] * (M_PI*2 / 360);
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sp = sin(angle);
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cp = cos(angle);
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angle = angles[ROLL] * (M_PI*2 / 360);
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sr = sin(angle);
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cr = cos(angle);
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forward[0] = cp*cy;
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forward[1] = cp*sy;
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forward[2] = -sp;
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right[0] = (-1*sr*sp*cy+-1*cr*-sy);
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right[1] = (-1*sr*sp*sy+-1*cr*cy);
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right[2] = -1*sr*cp;
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up[0] = (cr*sp*cy+-sr*-sy);
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up[1] = (cr*sp*sy+-sr*cy);
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up[2] = cr*cp;
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}
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int VectorCompare (vec3_t v1, vec3_t v2)
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{
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int i;
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for (i=0 ; i<3 ; i++)
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if (v1[i] != v2[i])
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return 0;
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return 1;
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}
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void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t 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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vec_t _DotProduct (vec3_t v1, vec3_t v2)
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{
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return v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2];
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}
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void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out)
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{
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out[0] = veca[0]-vecb[0];
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out[1] = veca[1]-vecb[1];
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out[2] = veca[2]-vecb[2];
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}
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void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out)
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{
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out[0] = veca[0]+vecb[0];
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out[1] = veca[1]+vecb[1];
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out[2] = veca[2]+vecb[2];
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}
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void _VectorCopy (vec3_t in, vec3_t out)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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}
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void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross)
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{
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cross[0] = v1[1]*v2[2] - v1[2]*v2[1];
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cross[1] = v1[2]*v2[0] - v1[0]*v2[2];
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cross[2] = v1[0]*v2[1] - v1[1]*v2[0];
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}
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vec_t VectorLength(vec3_t v)
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{
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return sqrt(DotProduct(v,v));
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}
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float VectorNormalize (vec3_t v)
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{
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float length, ilength;
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length = sqrt(DotProduct(v,v));
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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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{
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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 (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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{
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int answer=0;
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while (val>>=1)
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answer++;
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return answer;
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}
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/*
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================
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R_ConcatRotations
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================
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*/
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void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3])
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{
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out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
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in1[0][2] * in2[2][0];
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out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
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in1[0][2] * in2[2][1];
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out[0][2] = in1[0][0] * in2[0][2] + in1[0][1] * in2[1][2] +
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in1[0][2] * in2[2][2];
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out[1][0] = in1[1][0] * in2[0][0] + in1[1][1] * in2[1][0] +
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in1[1][2] * in2[2][0];
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out[1][1] = in1[1][0] * in2[0][1] + in1[1][1] * in2[1][1] +
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in1[1][2] * in2[2][1];
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out[1][2] = in1[1][0] * in2[0][2] + in1[1][1] * in2[1][2] +
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in1[1][2] * in2[2][2];
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out[2][0] = in1[2][0] * in2[0][0] + in1[2][1] * in2[1][0] +
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in1[2][2] * in2[2][0];
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out[2][1] = in1[2][0] * in2[0][1] + in1[2][1] * in2[1][1] +
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in1[2][2] * in2[2][1];
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out[2][2] = in1[2][0] * in2[0][2] + in1[2][1] * in2[1][2] +
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in1[2][2] * in2[2][2];
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}
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/*
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================
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R_ConcatTransforms
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================
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*/
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void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4])
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{
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out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
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in1[0][2] * in2[2][0];
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out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
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in1[0][2] * in2[2][1];
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out[0][2] = in1[0][0] * in2[0][2] + in1[0][1] * in2[1][2] +
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in1[0][2] * in2[2][2];
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out[0][3] = in1[0][0] * in2[0][3] + in1[0][1] * in2[1][3] +
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in1[0][2] * in2[2][3] + in1[0][3];
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out[1][0] = in1[1][0] * in2[0][0] + in1[1][1] * in2[1][0] +
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in1[1][2] * in2[2][0];
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out[1][1] = in1[1][0] * in2[0][1] + in1[1][1] * in2[1][1] +
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in1[1][2] * in2[2][1];
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out[1][2] = in1[1][0] * in2[0][2] + in1[1][1] * in2[1][2] +
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in1[1][2] * in2[2][2];
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out[1][3] = in1[1][0] * in2[0][3] + in1[1][1] * in2[1][3] +
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in1[1][2] * in2[2][3] + in1[1][3];
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out[2][0] = in1[2][0] * in2[0][0] + in1[2][1] * in2[1][0] +
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in1[2][2] * in2[2][0];
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out[2][1] = in1[2][0] * in2[0][1] + in1[2][1] * in2[1][1] +
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in1[2][2] * in2[2][1];
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out[2][2] = in1[2][0] * in2[0][2] + in1[2][1] * in2[1][2] +
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in1[2][2] * in2[2][2];
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out[2][3] = in1[2][0] * in2[0][3] + in1[2][1] * in2[1][3] +
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in1[2][2] * in2[2][3] + in1[2][3];
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}
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/*
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===================
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FloorDivMod
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Returns mathematically correct (floor-based) quotient and remainder for
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numer and denom, both of which should contain no fractional part. The
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quotient must fit in 32 bits.
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====================
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*/
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void FloorDivMod (double numer, double denom, int *quotient,
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int *rem)
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{
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int q, r;
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double x;
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#ifndef PARANOID
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if (denom <= 0.0)
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Sys_Error ("FloorDivMod: bad denominator %f\n", denom);
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// if ((floor(numer) != numer) || (floor(denom) != denom))
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// Sys_Error ("FloorDivMod: non-integer numer or denom %f %f\n",
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// numer, denom);
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#endif
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if (numer >= 0.0)
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{
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x = floor(numer / denom);
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q = (int)x;
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r = (int)floor(numer - (x * denom));
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}
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else
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{
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//
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// perform operations with positive values, and fix mod to make floor-based
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//
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x = floor(-numer / denom);
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q = -(int)x;
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r = (int)floor(-numer - (x * denom));
|
|
if (r != 0)
|
|
{
|
|
q--;
|
|
r = (int)denom - r;
|
|
}
|
|
}
|
|
|
|
*quotient = q;
|
|
*rem = r;
|
|
}
|
|
|
|
|
|
/*
|
|
===================
|
|
GreatestCommonDivisor
|
|
====================
|
|
*/
|
|
int GreatestCommonDivisor (int i1, int i2)
|
|
{
|
|
if (i1 > i2)
|
|
{
|
|
if (i2 == 0)
|
|
return (i1);
|
|
return GreatestCommonDivisor (i2, i1 % i2);
|
|
}
|
|
else
|
|
{
|
|
if (i1 == 0)
|
|
return (i2);
|
|
return GreatestCommonDivisor (i1, i2 % i1);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
===================
|
|
Invert24To16
|
|
|
|
Inverts an 8.24 value to a 16.16 value
|
|
====================
|
|
*/
|
|
|
|
fixed16_t Invert24To16(fixed16_t val)
|
|
{
|
|
if (val < 256)
|
|
return (0xFFFFFFFF);
|
|
|
|
return (fixed16_t)
|
|
(((double)0x10000 * (double)0x1000000 / (double)val) + 0.5);
|
|
}
|
|
|