1 files changed, 65 insertions, 0 deletions
diff --git a/common/math_defs.h b/common/math_defs.h
new file mode 100644
index 00000000..aa79b695
--- /dev/null
+++ b/common/math_defs.h
@@ -0,0 +1,65 @@
+#ifndef AL_MATH_DEFS_H
+#define AL_MATH_DEFS_H
+
+#include <math.h>
+#ifdef HAVE_FLOAT_H
+#include <float.h>
+#endif
+
+#ifndef M_PI
+#define M_PI (3.14159265358979323846)
+#endif
+
+#define F_PI    (3.14159265358979323846f)
+#define F_PI_2  (1.57079632679489661923f)
+#define F_TAU   (6.28318530717958647692f)
+
+#ifndef FLT_EPSILON
+#define FLT_EPSILON (1.19209290e-07f)
+#endif
+
+#define SQRT_2 1.41421356237309504880
+#define SQRT_3 1.73205080756887719318
+
+#define SQRTF_2 1.41421356237309504880f
+#define SQRTF_3 1.73205080756887719318f
+
+#ifndef HUGE_VALF
+static const union msvc_inf_hack {
+    unsigned char b[4];
+    float f;
+} msvc_inf_union = {{ 0x00, 0x00, 0x80, 0x7F }};
+#define HUGE_VALF (msvc_inf_union.f)
+#endif
+
+#ifndef HAVE_LOG2F
+static inline float log2f(float f)
+{
+    return logf(f) / logf(2.0f);
+}
+#endif
+
+#ifndef HAVE_CBRTF
+static inline float cbrtf(float f)
+{
+    return powf(f, 1.0f/3.0f);
+}
+#endif
+
+#ifndef HAVE_COPYSIGNF
+static inline float copysignf(float x, float y)
+{
+    union {
+        float f;
+        unsigned int u;
+    } ux = { x }, uy = { y };
+    ux.u &= 0x7fffffffu;
+    ux.u |= (uy.u&0x80000000u);
+    return ux.f;
+}
+#endif
+
+#define DEG2RAD(x)  ((float)(x) * (float)(M_PI/180.0))
+#define RAD2DEG(x)  ((float)(x) * (float)(180.0/M_PI))
+
+#endif /* AL_MATH_DEFS_H */