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DependentExtensions/cat/gfx/Scalar.hpp

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+/*
+	Copyright (c) 2009 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CAT_SCALAR_HPP
+#define CAT_SCALAR_HPP
+
+#include <cat/Platform.hpp>
+#include <cmath>
+
+namespace cat {
+
+
+// PI
+#define CAT_TWO_PI_64 6.283185307179586476925286766559
+#define CAT_TWO_PI_32 6.28318531f
+#define CAT_PI_64 3.1415926535897932384626433832795
+#define CAT_PI_32 3.14159265f
+#define CAT_HALF_PI_64 1.5707963267948966192313216916398
+#define CAT_HALF_PI_32 1.5707963268f
+#define CAT_QUARTER_PI_64 0.78539816339744830961566084581988
+#define CAT_QUARTER_PI_32 0.7853981634f
+#define CAT_INV_PI_64 0.31830988618379067153776752674503
+#define CAT_INV_PI_32 0.3183098862f
+
+
+// Angle conversion
+inline f64 Deg2Rad(f64 angle)
+{
+	return angle * CAT_TWO_PI_64 / 360.0;
+}
+inline f32 Deg2Rad(f32 angle)
+{
+	return angle * CAT_TWO_PI_32 / 360.0f;
+}
+inline f64 Rad2Deg(f64 angle)
+{
+	return angle * 360.0 / CAT_TWO_PI_64;
+}
+inline f32 Rad2Deg(f32 angle)
+{
+	return angle * 360.0f / CAT_TWO_PI_32;
+}
+
+
+// Generic clamp() function
+template<class Scalar>
+void Clamp(Scalar &x, Scalar low, Scalar high)
+{
+	if (x < low) x = low;
+	else if (x > high) x = high;
+}
+
+
+// Fast inverse square root
+f32 InvSqrt(f32 x);
+
+
+} // namespace cat
+
+#endif // CAT_SCALAR_HPP