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libobs/graphics/vec3.c

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+/******************************************************************************
+    Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.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 3 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/>.
+******************************************************************************/
+
+#include "vec3.h"
+#include "quat.h"
+#include "axisang.h"
+#include "plane.h"
+#include "matrix3.h"
+#include "math-extra.h"
+
+float vec3_plane_dist(const struct vec3 *v, const struct plane *p)
+{
+	return vec3_dot(v, &p->dir) - p->dist;
+}
+
+void vec3_rotate(struct vec3 *dst, const struct vec3 *v,
+		const struct matrix3 *m)
+{
+	struct vec3 temp;
+	vec3_copy(&temp, v);
+
+	dst->x = vec3_dot(&temp, &m->x);
+	dst->y = vec3_dot(&temp, &m->y);
+	dst->z = vec3_dot(&temp, &m->z);
+}
+
+void vec3_transform(struct vec3 *dst, const struct vec3 *v,
+		const struct matrix3 *m)
+{
+	struct vec3 temp;
+	vec3_sub(&temp, v, &m->t);
+
+	dst->x = vec3_dot(&temp, &m->x);
+	dst->y = vec3_dot(&temp, &m->y);
+	dst->z = vec3_dot(&temp, &m->z);
+}
+
+void vec3_mirror(struct vec3 *dst, const struct vec3 *v, const struct plane *p)
+{
+	struct vec3 temp;
+	vec3_mulf(&temp, &p->dir, vec3_plane_dist(v, p) * 2.0f);
+	vec3_sub(dst, v, &temp);
+}
+
+void vec3_mirrorv(struct vec3 *dst, const struct vec3 *v,
+		const struct vec3 *vec)
+{
+	struct vec3 temp;
+	vec3_mulf(&temp, vec, vec3_dot(v, vec) * 2.0f);
+	vec3_sub(dst, v, &temp);
+}
+
+void vec3_rand(struct vec3 *dst, int positive_only)
+{
+	dst->x = rand_float(positive_only);
+	dst->y = rand_float(positive_only);
+	dst->z = rand_float(positive_only);
+	dst->w = 0.0f;
+}