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a7ba26a0d2
* Added a FastMash.ush file for adding UE fast math function * Added Log/Exp approximation. #rb none #jira none #preflight shaders [CL 21536671 by Charles deRousiers in ue5-main branch]
24 lines
791 B
Plaintext
24 lines
791 B
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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FastMath.ush: Fast/approximated math functions
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=============================================================================*/
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#pragma once
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#include "FastMathThirdParty.ush"
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// Reference: http://www.humus.name/Articles/Persson_LowLevelThinking.pdf p.27
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#define FastExp_N(T) T FastExp(T x) { return exp2(1.442695f * x); }
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FastExp_N(float)
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FastExp_N(float2)
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FastExp_N(float3)
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FastExp_N(float4)
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// Reference: http://www.humus.name/Articles/Persson_LowLevelThinking.pdf p.27
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// Warning: This is a coarse approximation
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#define FastLog_N(T) T FastLog(T x) { return log2(0.693147f * x); }
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FastLog_N(float)
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FastLog_N(float2)
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FastLog_N(float3)
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FastLog_N(float4) |