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