`dpdx()`

Function in Builtins

dpdx(x): the screen-space partial derivative of x along the X axis, component-wise.

import { dpdx } from 'typeshade'

The signature, the description and the examples come from the compiler's own source at commit 26de7be8.

Syntax

const dpdx: <K extends FloatKey>(x: ReadonlyNode<K>) => Node<K>

Parameters

x ReadonlyNode<K>

Return value

Node<K>

Exceptions

SD0109: Like fwidth it exists only on the GPU and only in a fragment shader; the fragment-only-builtin lint rule reports SD0109 elsewhere.

Description

Like fwidth it exists only on the GPU (the CPU evaluation returns 0) and only in a fragment shader; the fragment-only-builtin lint rule reports SD0109 elsewhere. Spelled dpdx on WGSL and dFdx on GLSL ES 3.00; dpdy is the Y-axis partner.

Targets

Target	Support	Notes
WGSL (WebGPU)	Supported	`dpdx(x)`.
GLSL ES 3.00 (WebGL2)	Supported	`dFdx(x)`.
CPU oracle	Stub	The oracle has no texture memory and no neighbouring fragments. The call throws unless the module was compiled with `{ gpuStubs: true }`, which returns a placeholder.

In the guide

Source

src/core/ir/node.ts, line 2243, at commit 26de7be8

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dpdx()