Imported Upstream version 0.13.2+dsfg1

libobs/graphics/math-extra.h

@@ -0,0 +1,63 @@
+/******************************************************************************
+    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 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 "../util/c99defs.h"
+
+/*
+ * A few general math functions that I couldn't really decide where to put.
+ *
+ *   Polar/Cart conversion, torque functions (for smooth movement), percentage,
+ * random floats.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct vec2;
+struct vec3;
+
+EXPORT void polar_to_cart(struct vec3 *dst, const struct vec3 *v);
+EXPORT void cart_to_polar(struct vec3 *dst, const struct vec3 *v);
+
+EXPORT void norm_to_polar(struct vec2 *dst, const struct vec3 *norm);
+EXPORT void polar_to_norm(struct vec3 *dst, const struct vec2 *polar);
+
+EXPORT float calc_torquef(float val1, float val2, float torque,
+		float min_adjust, float t);
+
+EXPORT void calc_torque(struct vec3 *dst, const struct vec3 *v1,
+		const struct vec3 *v2, float torque, float min_adjust,
+		float t);
+
+static inline float get_percentage(float start, float end, float mid)
+{
+	return (mid-start) / (end-start);
+}
+
+static inline float get_percentagei(int start, int end, int mid)
+{
+	return (float)(mid-start) / (float)(end-start);
+}
+
+EXPORT float rand_float(int positive_only);
+
+#ifdef __cplusplus
+}
+#endif