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45 lines
1009 B
C++
45 lines
1009 B
C++
#ifndef MISC_MATHUTIL_H
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#define MISC_MATHUTIL_H
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#include <osg/Math>
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#include <osg/Vec2f>
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namespace Misc
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{
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/// Normalizes given angle to the range [-PI, PI]. E.g. PI*3/2 -> -PI/2.
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inline double normalizeAngle(double angle)
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{
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double fullTurns = angle / (2 * osg::PI) + 0.5;
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return (fullTurns - floor(fullTurns) - 0.5) * (2 * osg::PI);
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}
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/// Rotates given 2d vector counterclockwise. Angle is in radians.
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inline osg::Vec2f rotateVec2f(osg::Vec2f vec, float angle)
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{
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float s = std::sin(angle);
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float c = std::cos(angle);
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return osg::Vec2f(vec.x() * c + vec.y() * -s, vec.x() * s + vec.y() * c);
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}
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inline bool isPowerOfTwo(int x)
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{
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return ((x > 0) && ((x & (x - 1)) == 0));
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}
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inline int nextPowerOfTwo(int v)
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{
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if (isPowerOfTwo(v))
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return v;
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int depth = 0;
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while (v)
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{
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v >>= 1;
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depth++;
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}
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return 1 << depth;
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}
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}
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#endif
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