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return Statement

A return statement signals the end of a function.

return [value];

 

The simplest return statement returns control from the function to the calling program; it returns no value.


void main()
{
    return ;
}


However, a return statement can return one or more values. This example returns a literal value:



float main( float input : COLOR0) : COLOR0
{
    return 0;
}


This example returns the scalar result of an expression.


return  light.enabled = true ;

This example returns a four-component vector that is constructed from a local variable and a literal.


return  float4(color.rgb, 1) ;


This example returns a four-component vector that is constructed from the result that is returned from an intrinsic function, together with literal values.



float4 func(float2 a: POSITION): COLOR
{
    return float4(sin(length(a) * 100.0) * 0.5 + 0.5, sin(a.y * 50.0), 0, 1);
}


This example returns a structure that contains one or more members.



float4x4 WorldViewProj;

struct VS_OUTPUT
{
    float4 Pos  : POSITION;
};

VS_OUTPUT VertexShader_Tutorial_1(float4 inPos : POSITION )
{
    VS_OUTPUT out;
    out.Pos = mul(inPos, WorldViewProj );
    return out;
};


See also

Functions (DirectX HLSL)

 

 

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