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libobs/graphics/vec2.h

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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/>.
+******************************************************************************/
+
+#ifndef VECT2_H
+#define VECT2_H
+
+#include "../util/c99defs.h"
+#include <math.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct vec2 {
+	union {
+		struct {
+			float x, y;
+		};
+		float ptr[2];
+	};
+};
+
+static inline void vec2_zero(struct vec2 *dst)
+{
+	dst->x = 0.0f;
+	dst->y = 0.0f;
+}
+
+static inline void vec2_set(struct vec2 *dst, float x, float y)
+{
+	dst->x = x;
+	dst->y = y;
+}
+
+static inline void vec2_copy(struct vec2 *dst, const struct vec2 *v)
+{
+	dst->x = v->x;
+	dst->y = v->y;
+}
+
+static inline void vec2_add(struct vec2 *dst, const struct vec2 *v1,
+		const struct vec2 *v2)
+{
+	vec2_set(dst, v1->x+v2->x, v1->y+v2->y);	
+}
+
+static inline void vec2_sub(struct vec2 *dst, const struct vec2 *v1,
+		const struct vec2 *v2)
+{
+	vec2_set(dst, v1->x-v2->x, v1->y-v2->y);	
+}
+
+static inline void vec2_mul(struct vec2 *dst, const struct vec2 *v1,
+		const struct vec2 *v2)
+{
+	vec2_set(dst, v1->x*v2->x, v1->y*v2->y);	
+}
+
+static inline void vec2_div(struct vec2 *dst, const struct vec2 *v1,
+		const struct vec2 *v2)
+{
+	vec2_set(dst, v1->x/v2->x, v1->y/v2->y);	
+}
+
+static inline void vec2_addf(struct vec2 *dst, const struct vec2 *v,
+		float f)
+{
+	vec2_set(dst, v->x+f, v->y+f);	
+}
+
+static inline void vec2_subf(struct vec2 *dst, const struct vec2 *v,
+		float f)
+{
+	vec2_set(dst, v->x-f, v->y-f);	
+}
+
+static inline void vec2_mulf(struct vec2 *dst, const struct vec2 *v,
+		float f)
+{
+	vec2_set(dst, v->x*f, v->y*f);	
+}
+
+static inline void vec2_divf(struct vec2 *dst, const struct vec2 *v,
+		float f)
+{
+	vec2_set(dst, v->x/f, v->y/f);	
+}
+
+static inline void vec2_neg(struct vec2 *dst, const struct vec2 *v)
+{
+	vec2_set(dst, -v->x, -v->y);
+}
+
+static inline float vec2_dot(const struct vec2 *v1, const struct vec2 *v2)
+{
+	return (v1->x+v2->x) * (v1->y+v2->y);
+}
+
+static inline float vec2_len(const struct vec2 *v)
+{
+	return sqrtf(v->x*v->x + v->y*v->y);
+}
+
+static inline float vec2_dist(const struct vec2 *v1, const struct vec2 *v2)
+{
+	struct vec2 temp;
+	vec2_sub(&temp, v1, v2);
+	return vec2_len(&temp);
+}
+
+static inline void vec2_minf(struct vec2 *dst, const struct vec2 *v,
+		float val)
+{
+	if (v->x < val)
+		dst->x = val;
+	if (v->y < val)
+		dst->y = val;
+}
+
+static inline void vec2_min(struct vec2 *dst, const struct vec2 *v,
+		const struct vec2 *min_v)
+{
+	if (v->x < min_v->x)
+		dst->x = min_v->x;
+	if (v->y < min_v->y)
+		dst->y = min_v->y;
+}
+
+static inline void vec2_maxf(struct vec2 *dst, const struct vec2 *v,
+		float val)
+{
+	if (v->x > val)
+		dst->x = val;
+	if (v->y > val)
+		dst->y = val;
+}
+
+static inline void vec2_max(struct vec2 *dst, const struct vec2 *v,
+		const struct vec2 *max_v)
+{
+	if (v->x > max_v->x)
+		dst->x = max_v->x;
+	if (v->y > max_v->y)
+		dst->y = max_v->y;
+}
+
+EXPORT void vec2_abs(struct vec2 *dst, const struct vec2 *v);
+EXPORT void vec2_floor(struct vec2 *dst, const struct vec2 *v);
+EXPORT void vec2_ceil(struct vec2 *dst, const struct vec2 *v);
+EXPORT int vec2_close(const struct vec2 *v1, const struct vec2 *v2,
+		float epsilon);
+EXPORT void vec2_norm(struct vec2 *dst, const struct vec2 *v);
+
+#ifdef __cplusplus
+}
+#endif
+#endif