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1c2a0524b7
4x4 matrices aren't as optimal, but are much more sensible to handle when you want to do more advanced stuff like scaling, skewing, or inversion.
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(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. See the
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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, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#pragma once
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#include "math-defs.h"
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#include "vec3.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct matrix3;
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struct matrix4;
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struct plane {
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struct vec3 dir;
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float dist;
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};
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static inline void plane_copy(struct plane *dst, const struct plane *p)
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{
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vec3_copy(&dst->dir, &p->dir);
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dst->dist = p->dist;
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}
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static inline void plane_set(struct plane *dst, const struct vec3 *dir,
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float dist)
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{
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vec3_copy(&dst->dir, dir);
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dst->dist = dist;
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}
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static inline void plane_setf(struct plane *dst, float a, float b, float c,
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float d)
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{
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vec3_set(&dst->dir, a, b, c);
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dst->dist = d;
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}
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EXPORT void plane_from_tri(struct plane *dst,
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const struct vec3 *v1,
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const struct vec3 *v2,
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const struct vec3 *v3);
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EXPORT void plane_transform(struct plane *dst, const struct plane *p,
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const struct matrix4 *m);
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EXPORT void plane_transform3x4(struct plane *dst, const struct plane *p,
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const struct matrix3 *m);
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EXPORT bool plane_intersection_ray(const struct plane *p,
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const struct vec3 *orig, const struct vec3 *dir, float *t);
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EXPORT bool plane_intersection_line(const struct plane *p,
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const struct vec3 *v1, const struct vec3 *v2, float *t);
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EXPORT bool plane_tri_inside(const struct plane *p,
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const struct vec3 *v1,
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const struct vec3 *v2,
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const struct vec3 *v3,
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float precision);
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EXPORT bool plane_line_inside(const struct plane *p, const struct vec3 *v1,
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const struct vec3 *v2, float precision);
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static inline bool plane_close(const struct plane *p1, const struct plane *p2,
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float precision)
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{
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return vec3_close(&p1->dir, &p2->dir, precision) &&
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close_float(p1->dist, p2->dist, precision);
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}
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static inline bool plane_coplanar(const struct plane *p1,
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const struct plane *p2, float precision)
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{
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float cos_angle = vec3_dot(&p1->dir, &p2->dir);
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if (close_float(cos_angle, 1.0f, precision))
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return close_float(p1->dist, p2->dist, precision);
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else if (close_float(cos_angle, -1.0f, precision))
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return close_float(-p1->dist, p2->dist, precision);
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return false;
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}
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#ifdef __cplusplus
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}
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#endif
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