Slang Standard Library Reference
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lit

Description

Legacy lighting function (obsolete).

Signature

vector<float, 4> lit(
    float n_dot_l,
    float n_dot_h,
    float m);

Parameters

n_dot_l : float

The dot product of the normal and light vectors.

n_dot_h : float

The dot product of the normal and half-angle vectors.

m : float

The material shininess factor.

Return value

The lighting coefficients, (ambient, diffuse, specular, 1.0).

Remarks

In HLSL, this function is implemented as an intrinsic. It is emulated for other targets.

Availability and Requirements

Defined for the following targets:

hlsl

Available in all stages.

glsl

Available in all stages.

cpp

Available in all stages.

cuda

Available in all stages.

metal

Available in all stages.

spirv

Available in all stages.