dx-graphics-hlsl-trunc.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
trunc (Corecrt\_math.h)	Truncates a floating-point value to the integer component.	a0978fa2-71f8-4257-8c90-96224c2ec953	trunc HLSL	apiref	trunc	corecrt_math.h	HeaderDef	reference	05/31/2018

trunc

Truncates a floating-point value to the integer component.

ret trunc(x)

Parameters

Item	Description
x	[in] The specified input.

Return Value

The input value truncated to an integer component.

Remarks

This function truncates a floating-point value to the integer component. Given a floating-point value of 1.6, the trunc function would return 1.0, whereas the round (DirectX HLSL) function would return 2.0.

Type Description

Name	Template Type	Component Type	Size
x	scalar, vector, or matrix	float	any
ret	Same type as input x	float	Same dimension(s) as input x

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 1 (DirectX HLSL) and higher shader models	yes

Requirements

Requirement	Value
Header	Corecrt_math.h

See also

Intrinsic Functions (DirectX HLSL)