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Backporting qmath.h. Leave only part that was missed in Qt 5.0.

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--HG--
branch : develop
This commit is contained in:
Roman Telezhynskyi 2016-08-21 11:04:03 +03:00
parent 3dab49c23e
commit 3da7c4f27f
1 changed files with 1 additions and 222 deletions
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223
src/libs/vmisc/vmath.h
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@ -24,228 +24,7 @@
#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
#include <QtMath>
#else
#if 0
#pragma qt_class(QtMath)
#endif
#include <math.h>
#include <QtCore/qglobal.h>
#define QT_SINE_TABLE_SIZE 256
extern const qreal qt_sine_table[QT_SINE_TABLE_SIZE];
inline int qCeil(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return int(ceilf(float(v)));
else
#endif
return int(ceil(v));
}
inline int qFloor(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return int(floorf(float(v)));
else
#endif
return int(floor(v));
}
inline qreal qFabs(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if(sizeof(qreal) == sizeof(float))
return fabsf(float(v));
else
#endif
return fabs(v);
}
inline qreal qSin(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return sinf(float(v));
else
#endif
return sin(v);
}
inline qreal qCos(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return cosf(float(v));
else
#endif
return cos(v);
}
inline qreal qTan(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return tanf(float(v));
else
#endif
return tan(v);
}
inline qreal qAcos(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return acosf(float(v));
else
#endif
return acos(v);
}
inline qreal qAsin(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return asinf(float(v));
else
#endif
return asin(v);
}
inline qreal qAtan(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return atanf(float(v));
else
#endif
return atan(v);
}
inline qreal qAtan2(qreal y, qreal x)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return atan2f(float(y), float(x));
else
#endif
return atan2(y, x);
}
inline qreal qSqrt(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return sqrtf(float(v));
else
#endif
return sqrt(v);
}
inline qreal qLn(qreal v)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return logf(float(v));
else
#endif
return log(v);
}
inline qreal qExp(qreal v)
{
// only one signature
// exists, exp(double)
return exp(v);
}
inline qreal qPow(qreal x, qreal y)
{
#ifdef QT_USE_MATH_H_FLOATS
if (sizeof(qreal) == sizeof(float))
return powf(float(x), float(y));
else
#endif
return pow(x, y);
}
#ifndef M_E
#define M_E (2.7182818284590452354)
#endif
#ifndef M_LOG2E
#define M_LOG2E (1.4426950408889634074)
#endif
#ifndef M_LOG10E
#define M_LOG10E (0.43429448190325182765)
#endif
#ifndef M_LN2
#define M_LN2 (0.69314718055994530942)
#endif
#ifndef M_LN10
#define M_LN10 (2.30258509299404568402)
#endif
#ifndef M_PI
#define M_PI (3.14159265358979323846)
#endif
#ifndef M_PI_2
#define M_PI_2 (1.57079632679489661923)
#endif
#ifndef M_PI_4
#define M_PI_4 (0.78539816339744830962)
#endif
#ifndef M_1_PI
#define M_1_PI (0.31830988618379067154)
#endif
#ifndef M_2_PI
#define M_2_PI (0.63661977236758134308)
#endif
#ifndef M_2_SQRTPI
#define M_2_SQRTPI (1.12837916709551257390)
#endif
#ifndef M_SQRT2
#define M_SQRT2 (1.41421356237309504880)
#endif
#ifndef M_SQRT1_2
#define M_SQRT1_2 (0.70710678118654752440)
#endif
inline qreal qFastSin(qreal x)
{
int si = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
qreal d = x - si * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
int ci = si + QT_SINE_TABLE_SIZE / 4;
si &= QT_SINE_TABLE_SIZE - 1;
ci &= QT_SINE_TABLE_SIZE - 1;
return qt_sine_table[si] + (qt_sine_table[ci] - 0.5 * qt_sine_table[si] * d) * d;
}
inline qreal qFastCos(qreal x)
{
int ci = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
qreal d = x - ci * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
int si = ci + QT_SINE_TABLE_SIZE / 4;
si &= QT_SINE_TABLE_SIZE - 1;
ci &= QT_SINE_TABLE_SIZE - 1;
return qt_sine_table[si] - (qt_sine_table[ci] + 0.5 * qt_sine_table[si] * d) * d;
}
#include <QtMath>
Q_DECL_CONSTEXPR inline float qDegreesToRadians(float degrees)
{