o_e_s_standard_derivatives library Null safety

WebGL OES_standard_derivatives Khronos Ratified Extension Specification

https://www.khronos.org/registry/webgl/extensions/OES_standard_derivatives/

Classes

OES_standard_derivatives
The OES_standard_derivatives extension is part of the WebGL API and adds the GLSL derivative functions dFdx, dFdy, and fwidth. [...]