math: Add some vec2 functions

src/xrt/auxiliary/math/m_vec2.h

@@ -0,0 +1,74 @@
+// Copyright 2019, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  C vec2 math library.
+ * @author Jakob Bornecrantz <jakob@collabora.com>
+ *
+ * @see xrt_vec2
+ * @ingroup aux_math
+ */
+
+#pragma once
+
+#include "xrt/xrt_defines.h"
+
+#include <math.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+static inline struct xrt_vec2
+m_vec2_mul(struct xrt_vec2 l, struct xrt_vec2 r)
+{
+	struct xrt_vec2 ret = {l.x * r.x, l.y * r.y};
+	return ret;
+}
+
+static inline struct xrt_vec2
+m_vec2_mul_scalar(struct xrt_vec2 l, float r)
+{
+	struct xrt_vec2 ret = {l.x * r, l.y * r};
+	return ret;
+}
+
+static inline struct xrt_vec2
+m_vec2_add(struct xrt_vec2 l, struct xrt_vec2 r)
+{
+	struct xrt_vec2 ret = {l.x + r.x, l.y + r.y};
+	return ret;
+}
+
+static inline struct xrt_vec2
+m_vec2_sub(struct xrt_vec2 l, struct xrt_vec2 r)
+{
+	struct xrt_vec2 ret = {l.x - r.x, l.y - r.y};
+	return ret;
+}
+
+static inline struct xrt_vec2
+m_vec2_div(struct xrt_vec2 l, struct xrt_vec2 r)
+{
+	struct xrt_vec2 ret = {l.x / r.x, l.y / r.y};
+	return ret;
+}
+
+static inline struct xrt_vec2
+m_vec2_div_scalar(struct xrt_vec2 l, float r)
+{
+	struct xrt_vec2 ret = {l.x / r, l.y / r};
+	return ret;
+}
+
+static inline float
+m_vec2_len(struct xrt_vec2 l)
+{
+	return sqrtf(l.x * l.x + l.y * l.y);
+}
+
+
+#ifdef __cplusplus
+}
+#endif