vector.qh

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#pragma once

noref vector _vlen2;
#define vlen2(v) (_vlen2 = (v), dotproduct(_vlen2, _vlen2))

#if 1

#define vdist(v, cmp, f) (vlen2(v) cmp ((f) ** 2))
#else
#define vdist(v, cmp, f) (vlen(v) cmp (f))
#endif

#if 1
#define dotproduct(a, b) ((a) * (b))
#else
noref vector _dotproduct_a, _dotproduct_b;
#define dotproduct(a, b) \
    (_dotproduct_a = (a), _dotproduct_b = (b), \
      _dotproduct_a.x * _dotproduct_b.x \
    + _dotproduct_a.y * _dotproduct_b.y \
    + _dotproduct_a.z * _dotproduct_b.z)
#endif

#if 1
#define cross(a, b) ((a) >< (b))
#else
ERASEABLE
vector cross(vector a, vector b)
{
    return
        '1 0 0' * (a.y * b.z - a.z * b.y)
    +   '0 1 0' * (a.z * b.x - a.x * b.z)
    +   '0 0 1' * (a.x * b.y - a.y * b.x);
}
#endif

noref vector _vmul_a, _vmul_b;
#define vmul(a, b) \
    (_vmul_a = (a), _vmul_b = (b), \
      '1 0 0' * (_vmul_a.x * _vmul_b.x) \
    + '0 1 0' * (_vmul_a.y * _vmul_b.y) \
    + '0 0 1' * (_vmul_a.z * _vmul_b.z))

const vector eX = '1 0 0';
const vector eY = '0 1 0';
const vector eZ = '0 0 1';

ERASEABLE
vector randompos(vector m1, vector m2)
{
    vector v;
    m2 = m2 - m1;
    v_x = m2_x * random() + m1_x;
    v_y = m2_y * random() + m1_y;
    v_z = m2_z * random() + m1_z;
    return v;
}

ERASEABLE
float vlen_maxnorm2d(vector v)
{
    return max(v.x, v.y, -v.x, -v.y);
}

ERASEABLE
float vlen_minnorm2d(vector v)
{
    return min(max(v.x, -v.x), max(v.y, -v.y));
}

ERASEABLE
float boxesoverlap(vector m1, vector m2, vector m3, vector m4) { return m2_x >= m3_x && m1_x <= m4_x && m2_y >= m3_y && m1_y <= m4_y && m2_z >= m3_z && m1_z <= m4_z; }

ERASEABLE
float boxinsidebox(vector smins, vector smaxs, vector bmins, vector bmaxs) { return smins.x >= bmins.x && smaxs.x <= bmaxs.x && smins.y >= bmins.y && smaxs.y <= bmaxs.y && smins.z >= bmins.z && smaxs.z <= bmaxs.z; }

#define pointinsidebox(point, bmins, bmaxs) boxinsidebox(point, point, bmins, bmaxs)

#define PITCH(v) ((v).x)
#define YAW(v) ((v).y)
#define ROLL(v) ((v).z)

//pseudo prototypes:
// vector vec2(vector v); // returns a vector with just the x and y components of the given vector
// vector vec2(float x, float y); // returns a vector with the given x and y components

noref vector _vec2;
#define vec2(...) EVAL(OVERLOAD(vec2, __VA_ARGS__))
#define vec2_1(v) (_vec2 = (v), _vec2.z = 0, _vec2)
#define vec2_2(x, y) (_vec2_x = (x), _vec2_y = (y), _vec2)

noref vector _vec3;
#define vec3(_x, _y, _z) (_vec3.x = (_x), _vec3.y = (_y), _vec3.z = (_z), _vec3)

#define VEC_NAN vec3(FLOAT_NAN, FLOAT_NAN, FLOAT_NAN);

ERASEABLE
bool is_all_nans(vector v) {
    return isnan(v.x) && isnan(v.y) && isnan(v.z);
}

ERASEABLE
vector Rotate(vector v, float a)
{
    float a_sin = sin(a), a_cos = cos(a);
    return vec2(v.x * a_cos + v.y * a_sin, -v.x * a_sin + v.y * a_cos);
}

noref vector _yinvert;
#define yinvert(v) (_yinvert = (v), _yinvert.y = 1 - _yinvert.y, _yinvert)

ERASEABLE
vector point_line_vec(vector p, vector l0, vector ldir)
{
    ldir = normalize(ldir);
    p = l0 - p;
    // remove the component in line direction from p
    return p - ((p * ldir) * ldir);
}

ERASEABLE
vector reflect(vector dir, vector norm)
{
    return dir - 2 * (dir * norm) * norm;
}

ERASEABLE
vector vec_reflect(vector vel, vector norm, float bounce)
{
    return vel - (1 + bounce) * (vel * norm) * norm;
}

ERASEABLE
vector vec_epsilon(vector this, float eps)
{
    if (this.x > -eps && this.x < eps) this.x = 0;
    if (this.y > -eps && this.y < eps) this.y = 0;
    if (this.z > -eps && this.z < eps) this.z = 0;
    return this;
}

#define ClipVelocity(in, normal, out, overbounce) \
    (out = vec_epsilon(vec_reflect(in, normal, (overbounce) - 1), 0.1))

#ifdef GAMEQC
    ERASEABLE
    vector get_corner_position(entity box, int corner)
    {
        switch (corner)
        {
            case 1: return vec3(box.absmin.x, box.absmin.y, box.absmin.z);
            case 2: return vec3(box.absmax.x, box.absmin.y, box.absmin.z);
            case 3: return vec3(box.absmin.x, box.absmax.y, box.absmin.z);
            case 4: return vec3(box.absmin.x, box.absmin.y, box.absmax.z);
            case 5: return vec3(box.absmax.x, box.absmax.y, box.absmin.z);
            case 6: return vec3(box.absmin.x, box.absmax.y, box.absmax.z);
            case 7: return vec3(box.absmax.x, box.absmin.y, box.absmax.z);
            case 8: return vec3(box.absmax.x, box.absmax.y, box.absmax.z);
            default: return '0 0 0';
        }
    }

    ERASEABLE
    vector NearestPointOnBox(entity box, vector org)
    {
        vector m1 = box.mins + box.origin;
        vector m2 = box.maxs + box.origin;

        return vec3(
            bound(m1.x, org.x, m2.x),
            bound(m1.y, org.y, m2.y),
            bound(m1.z, org.z, m2.z)
        );
    }
#endif