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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 <intrin.h>
#include <math.h>
#include <windows.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;
}
template<typename T, typename MIN, typename MAX>
inline T clamp(T x, MIN min, MAX max)
{
return x < min ? min : (x > max ? max : x);
}
inline float clamp01(float x)
{
return clamp(x, 0.0f, 1.0f);
}
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);
}
}
inline RECT transformPixelRect(GLint x, GLint y, GLint w, GLint h, GLint surfaceHeight)
{
RECT rect = {x,
surfaceHeight - y - h,
x + w,
surfaceHeight - y};
return rect;
}
inline int transformPixelYOffset(GLint yoffset, GLint h, GLint surfaceHeight)
{
return surfaceHeight - yoffset - h;
}
inline GLenum adjustWinding(GLenum winding)
{
ASSERT(winding == GL_CW || winding == GL_CCW);
return winding == GL_CW ? GL_CCW : GL_CW;
}
inline bool supportsSSE2()
{
static bool checked = false;
static bool supports = false;
if (checked)
{
return supports;
}
int info[4];
__cpuid(info, 0);
if (info[0] >= 1)
{
__cpuid(info, 1);
supports = (info[3] >> 26) & 1;
}
checked = true;
return supports;
}
}
#endif // LIBGLESV2_MATHUTIL_H_
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