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-rw-r--r--apps/plugins/sdl/progs/quake/mathlib.c583
1 files changed, 583 insertions, 0 deletions
diff --git a/apps/plugins/sdl/progs/quake/mathlib.c b/apps/plugins/sdl/progs/quake/mathlib.c
new file mode 100644
index 0000000..2dc8c6f
--- /dev/null
+++ b/apps/plugins/sdl/progs/quake/mathlib.c
@@ -0,0 +1,583 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+*/
+// mathlib.c -- math primitives
+
+#include <math.h>
+#include "quakedef.h"
+
+void Sys_Error (char *error, ...);
+
+vec3_t vec3_origin = {0,0,0};
+int nanmask = 255<<23;
+
+/*-----------------------------------------------------------------*/
+
+#define DEG2RAD( a ) ( a * M_PI ) / 180.0F
+
+void ProjectPointOnPlane( vec3_t dst, const vec3_t p, const vec3_t normal )
+{
+ float d;
+ vec3_t n;
+ float inv_denom;
+
+ inv_denom = 1.0F / DotProduct( normal, normal );
+
+ d = DotProduct( normal, p ) * inv_denom;
+
+ n[0] = normal[0] * inv_denom;
+ n[1] = normal[1] * inv_denom;
+ n[2] = normal[2] * inv_denom;
+
+ dst[0] = p[0] - d * n[0];
+ dst[1] = p[1] - d * n[1];
+ dst[2] = p[2] - d * n[2];
+}
+
+/*
+** assumes "src" is normalized
+*/
+void PerpendicularVector( vec3_t dst, const vec3_t src )
+{
+ int pos;
+ int i;
+ float minelem = 1.0F;
+ vec3_t tempvec;
+
+ /*
+ ** find the smallest magnitude axially aligned vector
+ */
+ for ( pos = 0, i = 0; i < 3; i++ )
+ {
+ if ( fabs( src[i] ) < minelem )
+ {
+ pos = i;
+ minelem = fabs( src[i] );
+ }
+ }
+ tempvec[0] = tempvec[1] = tempvec[2] = 0.0F;
+ tempvec[pos] = 1.0F;
+
+ /*
+ ** project the point onto the plane defined by src
+ */
+ ProjectPointOnPlane( dst, tempvec, src );
+
+ /*
+ ** normalize the result
+ */
+ VectorNormalize( dst );
+}
+
+#ifdef _WIN32
+#pragma optimize( "", off )
+#endif
+
+
+void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point, float degrees )
+{
+ float m[3][3];
+ float im[3][3];
+ float zrot[3][3];
+ float tmpmat[3][3];
+ float rot[3][3];
+ int i;
+ vec3_t vr, vup, vf;
+
+ vf[0] = dir[0];
+ vf[1] = dir[1];
+ vf[2] = dir[2];
+
+ PerpendicularVector( vr, dir );
+ CrossProduct( vr, vf, vup );
+
+ m[0][0] = vr[0];
+ m[1][0] = vr[1];
+ m[2][0] = vr[2];
+
+ m[0][1] = vup[0];
+ m[1][1] = vup[1];
+ m[2][1] = vup[2];
+
+ m[0][2] = vf[0];
+ m[1][2] = vf[1];
+ m[2][2] = vf[2];
+
+ memcpy( im, m, sizeof( im ) );
+
+ im[0][1] = m[1][0];
+ im[0][2] = m[2][0];
+ im[1][0] = m[0][1];
+ im[1][2] = m[2][1];
+ im[2][0] = m[0][2];
+ im[2][1] = m[1][2];
+
+ memset( zrot, 0, sizeof( zrot ) );
+ zrot[0][0] = zrot[1][1] = zrot[2][2] = 1.0F;
+
+ zrot[0][0] = cos( DEG2RAD( degrees ) );
+ zrot[0][1] = sin( DEG2RAD( degrees ) );
+ zrot[1][0] = -sin( DEG2RAD( degrees ) );
+ zrot[1][1] = cos( DEG2RAD( degrees ) );
+
+ R_ConcatRotations( m, zrot, tmpmat );
+ R_ConcatRotations( tmpmat, im, rot );
+
+ for ( i = 0; i < 3; i++ )
+ {
+ dst[i] = rot[i][0] * point[0] + rot[i][1] * point[1] + rot[i][2] * point[2];
+ }
+}
+
+#ifdef _WIN32
+#pragma optimize( "", on )
+#endif
+
+/*-----------------------------------------------------------------*/
+
+
+float anglemod(float a)
+{
+#if 0
+ if (a >= 0)
+ a -= 360*(int)(a/360);
+ else
+ a += 360*( 1 + (int)(-a/360) );
+#endif
+ a = (360.0/65536) * ((int)(a*(65536/360.0)) & 65535);
+ return a;
+}
+
+/*
+==================
+BOPS_Error
+
+Split out like this for ASM to call.
+==================
+*/
+void BOPS_Error (void)
+{
+ Sys_Error ("BoxOnPlaneSide: Bad signbits");
+}
+
+
+#if !id386
+
+/*
+==================
+BoxOnPlaneSide
+
+Returns 1, 2, or 1 + 2
+==================
+*/
+int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, mplane_t *p)
+{
+ float dist1, dist2;
+ int sides;
+
+#if 0 // this is done by the BOX_ON_PLANE_SIDE macro before calling this
+ // function
+// fast axial cases
+ if (p->type < 3)
+ {
+ if (p->dist <= emins[p->type])
+ return 1;
+ if (p->dist >= emaxs[p->type])
+ return 2;
+ return 3;
+ }
+#endif
+
+// general case
+ switch (p->signbits)
+ {
+ case 0:
+dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
+dist2 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
+ break;
+ case 1:
+dist1 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
+dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
+ break;
+ case 2:
+dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
+dist2 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
+ break;
+ case 3:
+dist1 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
+dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
+ break;
+ case 4:
+dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
+dist2 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
+ break;
+ case 5:
+dist1 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emins[2];
+dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emaxs[2];
+ break;
+ case 6:
+dist1 = p->normal[0]*emaxs[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
+dist2 = p->normal[0]*emins[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
+ break;
+ case 7:
+dist1 = p->normal[0]*emins[0] + p->normal[1]*emins[1] + p->normal[2]*emins[2];
+dist2 = p->normal[0]*emaxs[0] + p->normal[1]*emaxs[1] + p->normal[2]*emaxs[2];
+ break;
+ default:
+ dist1 = dist2 = 0; // shut up compiler
+ BOPS_Error ();
+ break;
+ }
+
+#if 0
+ int i;
+ vec3_t corners[2];
+
+ for (i=0 ; i<3 ; i++)
+ {
+ if (plane->normal[i] < 0)
+ {
+ corners[0][i] = emins[i];
+ corners[1][i] = emaxs[i];
+ }
+ else
+ {
+ corners[1][i] = emins[i];
+ corners[0][i] = emaxs[i];
+ }
+ }
+ dist = DotProduct (plane->normal, corners[0]) - plane->dist;
+ dist2 = DotProduct (plane->normal, corners[1]) - plane->dist;
+ sides = 0;
+ if (dist1 >= 0)
+ sides = 1;
+ if (dist2 < 0)
+ sides |= 2;
+
+#endif
+
+ sides = 0;
+ if (dist1 >= p->dist)
+ sides = 1;
+ if (dist2 < p->dist)
+ sides |= 2;
+
+#ifdef PARANOID
+if (sides == 0)
+ Sys_Error ("BoxOnPlaneSide: sides==0");
+#endif
+
+ return sides;
+}
+
+#endif
+
+
+void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up)
+{
+ float angle;
+ float sr, sp, sy, cr, cp, cy;
+
+ angle = angles[YAW] * (M_PI*2 / 360);
+ sy = sin(angle);
+ cy = cos(angle);
+ angle = angles[PITCH] * (M_PI*2 / 360);
+ sp = sin(angle);
+ cp = cos(angle);
+ angle = angles[ROLL] * (M_PI*2 / 360);
+ sr = sin(angle);
+ cr = cos(angle);
+
+ forward[0] = cp*cy;
+ forward[1] = cp*sy;
+ forward[2] = -sp;
+ right[0] = (-1*sr*sp*cy+-1*cr*-sy);
+ right[1] = (-1*sr*sp*sy+-1*cr*cy);
+ right[2] = -1*sr*cp;
+ up[0] = (cr*sp*cy+-sr*-sy);
+ up[1] = (cr*sp*sy+-sr*cy);
+ up[2] = cr*cp;
+}
+
+int VectorCompare (vec3_t v1, vec3_t v2)
+{
+ int i;
+
+ for (i=0 ; i<3 ; i++)
+ if (v1[i] != v2[i])
+ return 0;
+
+ return 1;
+}
+
+void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t vecc)
+{
+ vecc[0] = veca[0] + scale*vecb[0];
+ vecc[1] = veca[1] + scale*vecb[1];
+ vecc[2] = veca[2] + scale*vecb[2];
+}
+
+
+vec_t _DotProduct (vec3_t v1, vec3_t v2)
+{
+ return v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2];
+}
+
+void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out)
+{
+ out[0] = veca[0]-vecb[0];
+ out[1] = veca[1]-vecb[1];
+ out[2] = veca[2]-vecb[2];
+}
+
+void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out)
+{
+ out[0] = veca[0]+vecb[0];
+ out[1] = veca[1]+vecb[1];
+ out[2] = veca[2]+vecb[2];
+}
+
+void _VectorCopy (vec3_t in, vec3_t out)
+{
+ out[0] = in[0];
+ out[1] = in[1];
+ out[2] = in[2];
+}
+
+void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross)
+{
+ cross[0] = v1[1]*v2[2] - v1[2]*v2[1];
+ cross[1] = v1[2]*v2[0] - v1[0]*v2[2];
+ cross[2] = v1[0]*v2[1] - v1[1]*v2[0];
+}
+
+vec_t Length(vec3_t v)
+{
+ int i;
+ float length;
+
+ length = 0;
+ for (i=0 ; i< 3 ; i++)
+ length += v[i]*v[i];
+ length = sqrt (length); // FIXME
+
+ return length;
+}
+
+float VectorNormalize (vec3_t v)
+{
+ float length, ilength;
+
+ length = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];
+ length = sqrt (length); // FIXME
+
+ if (length)
+ {
+ ilength = 1/length;
+ v[0] *= ilength;
+ v[1] *= ilength;
+ v[2] *= ilength;
+ }
+
+ return length;
+
+}
+
+void VectorInverse (vec3_t v)
+{
+ v[0] = -v[0];
+ v[1] = -v[1];
+ v[2] = -v[2];
+}
+
+void VectorScale (vec3_t in, vec_t scale, vec3_t out)
+{
+ out[0] = in[0]*scale;
+ out[1] = in[1]*scale;
+ out[2] = in[2]*scale;
+}
+
+
+int Q_log2(int val)
+{
+ int answer=0;
+ while (val>>=1)
+ answer++;
+ return answer;
+}
+
+
+/*
+================
+R_ConcatRotations
+================
+*/
+void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3])
+{
+ out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
+ in1[0][2] * in2[2][0];
+ out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
+ in1[0][2] * in2[2][1];
+ out[0][2] = in1[0][0] * in2[0][2] + in1[0][1] * in2[1][2] +
+ in1[0][2] * in2[2][2];
+ out[1][0] = in1[1][0] * in2[0][0] + in1[1][1] * in2[1][0] +
+ in1[1][2] * in2[2][0];
+ out[1][1] = in1[1][0] * in2[0][1] + in1[1][1] * in2[1][1] +
+ in1[1][2] * in2[2][1];
+ out[1][2] = in1[1][0] * in2[0][2] + in1[1][1] * in2[1][2] +
+ in1[1][2] * in2[2][2];
+ out[2][0] = in1[2][0] * in2[0][0] + in1[2][1] * in2[1][0] +
+ in1[2][2] * in2[2][0];
+ out[2][1] = in1[2][0] * in2[0][1] + in1[2][1] * in2[1][1] +
+ in1[2][2] * in2[2][1];
+ out[2][2] = in1[2][0] * in2[0][2] + in1[2][1] * in2[1][2] +
+ in1[2][2] * in2[2][2];
+}
+
+
+/*
+================
+R_ConcatTransforms
+================
+*/
+void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4])
+{
+ out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
+ in1[0][2] * in2[2][0];
+ out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
+ in1[0][2] * in2[2][1];
+ out[0][2] = in1[0][0] * in2[0][2] + in1[0][1] * in2[1][2] +
+ in1[0][2] * in2[2][2];
+ out[0][3] = in1[0][0] * in2[0][3] + in1[0][1] * in2[1][3] +
+ in1[0][2] * in2[2][3] + in1[0][3];
+ out[1][0] = in1[1][0] * in2[0][0] + in1[1][1] * in2[1][0] +
+ in1[1][2] * in2[2][0];
+ out[1][1] = in1[1][0] * in2[0][1] + in1[1][1] * in2[1][1] +
+ in1[1][2] * in2[2][1];
+ out[1][2] = in1[1][0] * in2[0][2] + in1[1][1] * in2[1][2] +
+ in1[1][2] * in2[2][2];
+ out[1][3] = in1[1][0] * in2[0][3] + in1[1][1] * in2[1][3] +
+ in1[1][2] * in2[2][3] + in1[1][3];
+ out[2][0] = in1[2][0] * in2[0][0] + in1[2][1] * in2[1][0] +
+ in1[2][2] * in2[2][0];
+ out[2][1] = in1[2][0] * in2[0][1] + in1[2][1] * in2[1][1] +
+ in1[2][2] * in2[2][1];
+ out[2][2] = in1[2][0] * in2[0][2] + in1[2][1] * in2[1][2] +
+ in1[2][2] * in2[2][2];
+ out[2][3] = in1[2][0] * in2[0][3] + in1[2][1] * in2[1][3] +
+ in1[2][2] * in2[2][3] + in1[2][3];
+}
+
+
+/*
+===================
+FloorDivMod
+
+Returns mathematically correct (floor-based) quotient and remainder for
+numer and denom, both of which should contain no fractional part. The
+quotient must fit in 32 bits.
+====================
+*/
+
+void FloorDivMod (double numer, double denom, int *quotient,
+ int *rem)
+{
+ int q, r;
+ double x;
+
+#ifndef PARANOID
+ if (denom <= 0.0)
+ Sys_Error ("FloorDivMod: bad denominator %d\n", denom);
+
+// if ((floor(numer) != numer) || (floor(denom) != denom))
+// Sys_Error ("FloorDivMod: non-integer numer or denom %f %f\n",
+// numer, denom);
+#endif
+
+ if (numer >= 0.0)
+ {
+
+ x = floor(numer / denom);
+ q = (int)x;
+ r = (int)floor(numer - (x * denom));
+ }
+ else
+ {
+ //
+ // perform operations with positive values, and fix mod to make floor-based
+ //
+ x = floor(-numer / denom);
+ q = -(int)x;
+ 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);
+ }
+}
+
+
+#if !id386
+
+// TODO: move to nonintel.c
+
+/*
+===================
+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);
+}
+
+#endif
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