mirror of https://github.com/ZDoom/gzdoom.git
254 lines
5.3 KiB
C++
254 lines
5.3 KiB
C++
#include "vectors.h"
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#include "actor.h"
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#include "tables.h"
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#define DEG2RAD( a ) ( a * M_PI ) / 180.0F
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// [RH] Convert a thing's position into a vec3_t
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void VectorPosition (const AActor *thing, vec3_t out)
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{
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out[0] = (float)thing->x / 65536.0f;
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out[1] = (float)thing->y / 65536.0f;
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out[2] = (float)thing->z / 65536.0f;
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}
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void FixedAngleToVector (angle_t an, int pitch, vec3_t v)
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{
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an >>= ANGLETOFINESHIFT;
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v[0] = ((float)finecosine[an]) / 65536.0f;
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v[1] = ((float)finesine[an]) / 65536.0f;
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v[2] = ((float)finetangent[FINEANGLES/4-(pitch>>ANGLETOFINESHIFT)]) / 65536.0f;
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VectorNormalize (v);
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}
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// Taken from Q2
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vec_t VectorLength (const vec3_t v)
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{
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float length;
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length = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];
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length = sqrtf (length);
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return length;
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}
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void VectorMA (const vec3_t a, float scale, const vec3_t b, vec3_t out)
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{
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out[0] = a[0] + scale * b[0];
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out[1] = a[1] + scale * b[1];
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out[2] = a[2] + scale * b[2];
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}
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void VectorScale (const vec3_t v, float scale, vec3_t out)
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{
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out[0] = v[0] * scale;
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out[1] = v[1] * scale;
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out[2] = v[2] * scale;
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}
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void VectorScale2 (vec3_t v, float scale)
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{
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v[0] = v[0] * scale;
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v[1] = v[1] * scale;
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v[2] = v[2] * scale;
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}
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int VectorCompare (const vec3_t v1, const vec3_t v2)
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{
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if (v1[0] != v2[0] || v1[1] != v2[1] || v1[2] != v2[2])
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return 0;
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return 1;
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}
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vec_t 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 = sqrtf (length);
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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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vec_t VectorNormalize2 (const vec3_t v, vec3_t out)
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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 = sqrtf (length);
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if (length)
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{
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ilength = 1/length;
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out[0] = v[0]*ilength;
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out[1] = v[1]*ilength;
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out[2] = v[2]*ilength;
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}
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return length;
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}
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void CrossProduct (const vec3_t v1, const 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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#ifdef _MSC_VER
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#pragma optimize( "", off )
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#endif
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void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point, float degrees )
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{
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float m[3][3];
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float im[3][3];
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float zrot[3][3];
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float tmpmat[3][3];
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float rot[3][3];
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int i;
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vec3_t vr, vup, vf;
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vf[0] = dir[0];
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vf[1] = dir[1];
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vf[2] = dir[2];
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PerpendicularVector( vr, dir );
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CrossProduct( vr, vf, vup );
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m[0][0] = vr[0];
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m[1][0] = vr[1];
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m[2][0] = vr[2];
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m[0][1] = vup[0];
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m[1][1] = vup[1];
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m[2][1] = vup[2];
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m[0][2] = vf[0];
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m[1][2] = vf[1];
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m[2][2] = vf[2];
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memcpy( im, m, sizeof( im ) );
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im[0][1] = m[1][0];
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im[0][2] = m[2][0];
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im[1][0] = m[0][1];
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im[1][2] = m[2][1];
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im[2][0] = m[0][2];
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im[2][1] = m[1][2];
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memset( zrot, 0, sizeof( zrot ) );
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zrot[0][0] = zrot[1][1] = zrot[2][2] = 1.0F;
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zrot[0][0] = (float)cos( DEG2RAD( degrees ) );
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zrot[0][1] = (float)sin( DEG2RAD( degrees ) );
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zrot[1][0] = (float)-sin( DEG2RAD( degrees ) );
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zrot[1][1] = (float)cos( DEG2RAD( degrees ) );
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R_ConcatRotations( m, zrot, tmpmat );
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R_ConcatRotations( tmpmat, im, rot );
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for ( i = 0; i < 3; i++ )
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{
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dst[i] = rot[i][0] * point[0] + rot[i][1] * point[1] + rot[i][2] * point[2];
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}
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}
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#ifdef _MSC_VER
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#pragma optimize( "", on )
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#endif
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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 = (float)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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/*
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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 (const float in1[3][3], const 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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