mirror of https://github.com/minetest/irrlicht.git
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// This file is part of the "Irrlicht Engine".
|
|
// For conditions of distribution and use, see copyright notice in irrlicht.h
|
|
|
|
#ifndef __IRR_FAST_MATH_COMPAT_H_INCLUDED__
|
|
#define __IRR_FAST_MATH_COMPAT_H_INCLUDED__
|
|
|
|
#include "irrMath.h"
|
|
|
|
namespace irr
|
|
{
|
|
namespace core
|
|
{
|
|
|
|
|
|
// IRRLICHT_FAST_MATH functions which I wanted to kick out because they return
|
|
// wrong results. But last time I proposed that I've been asked to keep them for
|
|
// Burnings software renderer. So to avoid changing that accidentally or messing up
|
|
// it's speed I'll keep them around, but only as internal header.
|
|
// They should not be used otherwise any longer.
|
|
|
|
// Some examples for unexpected results when using this with IRRLICHT_FAST_MATH:
|
|
// Input 1, expected 1, got 0
|
|
// Input 3, expected 3, got 2
|
|
// Input -1.40129846e-45, expected -1, got 0
|
|
REALINLINE s32 floor32_fast(f32 x)
|
|
{
|
|
return (s32) floorf ( x );
|
|
}
|
|
|
|
// Some examples for unexpected results when using this with IRRLICHT_FAST_MATH:
|
|
// Input 1.40129846e-45, expected 1, got 0
|
|
// Input -1, expected -1, got 0
|
|
// Input -3, expected -3, got -2
|
|
REALINLINE s32 ceil32_fast ( f32 x )
|
|
{
|
|
return (s32) ceilf ( x );
|
|
}
|
|
|
|
// Some examples for unexpected results when using this with IRRLICHT_FAST_MATH:
|
|
// Input 0.5, expected 1, got 0
|
|
// Input 2.5, expected 3, got 2
|
|
// Input -1.40129846e-45, expected -nan(ind), got -inf
|
|
// Input -2.80259693e-45, expected -nan(ind), got -inf
|
|
REALINLINE s32 round32_fast(f32 x)
|
|
{
|
|
return (s32) round_(x);
|
|
}
|
|
|
|
} // end namespace core
|
|
} // end namespace irr
|
|
|
|
#endif // __IRR_FAST_MATH_COMPAT_H_INCLUDED__
|