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- /******************************************************************************
- Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>
- 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, see <http://www.gnu.org/licenses/>.
- ******************************************************************************/
- #pragma once
- #include "math-defs.h"
- #include "vec3.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- struct matrix3;
- struct matrix4;
- struct plane {
- struct vec3 dir;
- float dist;
- };
- static inline void plane_copy(struct plane *dst, const struct plane *p)
- {
- vec3_copy(&dst->dir, &p->dir);
- dst->dist = p->dist;
- }
- static inline void plane_set(struct plane *dst, const struct vec3 *dir, float dist)
- {
- vec3_copy(&dst->dir, dir);
- dst->dist = dist;
- }
- static inline void plane_setf(struct plane *dst, float a, float b, float c, float d)
- {
- vec3_set(&dst->dir, a, b, c);
- dst->dist = d;
- }
- EXPORT void plane_from_tri(struct plane *dst, const struct vec3 *v1, const struct vec3 *v2, const struct vec3 *v3);
- EXPORT void plane_transform(struct plane *dst, const struct plane *p, const struct matrix4 *m);
- EXPORT void plane_transform3x4(struct plane *dst, const struct plane *p, const struct matrix3 *m);
- EXPORT bool plane_intersection_ray(const struct plane *p, const struct vec3 *orig, const struct vec3 *dir, float *t);
- EXPORT bool plane_intersection_line(const struct plane *p, const struct vec3 *v1, const struct vec3 *v2, float *t);
- EXPORT bool plane_tri_inside(const struct plane *p, const struct vec3 *v1, const struct vec3 *v2, const struct vec3 *v3,
- float precision);
- EXPORT bool plane_line_inside(const struct plane *p, const struct vec3 *v1, const struct vec3 *v2, float precision);
- static inline bool plane_close(const struct plane *p1, const struct plane *p2, float precision)
- {
- return vec3_close(&p1->dir, &p2->dir, precision) && close_float(p1->dist, p2->dist, precision);
- }
- static inline bool plane_coplanar(const struct plane *p1, const struct plane *p2, float precision)
- {
- float cos_angle = vec3_dot(&p1->dir, &p2->dir);
- if (close_float(cos_angle, 1.0f, precision))
- return close_float(p1->dist, p2->dist, precision);
- else if (close_float(cos_angle, -1.0f, precision))
- return close_float(-p1->dist, p2->dist, precision);
- return false;
- }
- #ifdef __cplusplus
- }
- #endif
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