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//
// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// mathutil.h: Math and bit manipulation functions.
#ifndef LIBGLESV2_MATHUTIL_H_
#define LIBGLESV2_MATHUTIL_H_
#include <math.h>
namespace gl
{
inline bool isPow2(int x)
{
return (x & (x - 1)) == 0 && (x != 0);
}
inline int log2(int x)
{
int r = 0;
while ((x >> r) > 1) r++;
return r;
}
inline unsigned int ceilPow2(unsigned int x)
{
if (x != 0) x--;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
x++;
return x;
}
inline float clamp01(float x)
{
return x < 0 ? 0 : (x > 1 ? 1 : x);
}
template<const int n>
inline unsigned int unorm(float x)
{
const unsigned int max = 0xFFFFFFFF >> (32 - n);
if (x > 1)
{
return max;
}
else if (x < 0)
{
return 0;
}
else
{
return (unsigned int)(max * x + 0.5f);
}
}
}
#endif // LIBGLESV2_MATHUTIL_H_
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