`fwidth`

Function

Returns the sum of the absolute screen-space derivatives of x in both directions, abs(dpdx(x)) + abs(dpdy(x)), componentwise over vectors.

The signature and the sentence under each name are the compiler's own text at commit 26de7be8.

Syntax

declare function fwidth(a0: f32): f32
declare function fwidth<V extends vec2 | vec3 | vec4>(a0: V): V
declare function fwidth<T extends Numeric>(a0: T): T

A signature may name a type the ambient file declares for its own use. These are those declarations.

Numeric: type Numeric = number | vec2 | vec3 | vec4 | vec2i | vec3i | vec4i | vec2u | vec3u | vec4u

Parameters

A parameter named by position (a0, a1) carries a name the ambient file generates. A call passes its arguments in order and names none of them.

a0 f32VT

Return value

f32VT

Description

Fragment stage only; the CPU oracle returns zero.

The CPU oracle has no texture memory and no neighbouring fragments. The call throws unless the module was compiled with { gpuStubs: true }, which returns a placeholder.

Targets

WGSL: fwidth(a)
GLSL ES 3.00: fwidth(a)

`fwidth`

Syntax

Parameters

Return value

Description

Targets

Examples

See also

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