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//
// Copyright (c) 2002-2012 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 "common/system.h"
#include "common/debug.h"
namespace gl
{
struct Vector4
{
Vector4() {}
Vector4(float x, float y, float z, float w) : x(x), y(y), z(z), w(w) {}
float x;
float y;
float z;
float w;
};
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)
{
// Since NaNs fail all comparison tests, a NaN value will default to min
return x > min ? (x > max ? max : x) : min;
}
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 bool supportsSSE2()
{
static bool checked = false;
static bool supports = false;
if (checked)
{
return supports;
}
#if defined(_M_IX86) || defined(_M_AMD64) // ARM doesn't provide __cpuid()
int info[4];
__cpuid(info, 0);
if (info[0] >= 1)
{
__cpuid(info, 1);
supports = (info[3] >> 26) & 1;
}
#endif
checked = true;
return supports;
}
inline unsigned short float32ToFloat16(float fp32)
{
unsigned int fp32i = (unsigned int&)fp32;
unsigned int sign = (fp32i & 0x80000000) >> 16;
unsigned int abs = fp32i & 0x7FFFFFFF;
if(abs > 0x47FFEFFF) // Infinity
{
return sign | 0x7FFF;
}
else if(abs < 0x38800000) // Denormal
{
unsigned int mantissa = (abs & 0x007FFFFF) | 0x00800000;
int e = 113 - (abs >> 23);
if(e < 24)
{
abs = mantissa >> e;
}
else
{
abs = 0;
}
return sign | (abs + 0x00000FFF + ((abs >> 13) & 1)) >> 13;
}
else
{
return sign | (abs + 0xC8000000 + 0x00000FFF + ((abs >> 13) & 1)) >> 13;
}
}
float float16ToFloat32(unsigned short h);
}
namespace rx
{
struct Range
{
Range() {}
Range(int lo, int hi) : start(lo), end(hi) { ASSERT(lo <= hi); }
int start;
int end;
};
}
#endif // LIBGLESV2_MATHUTIL_H_
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