Although the extension is fully implemented in ES3 itself.
@ -63,7 +63,9 @@ in lowp vec3 barycentric;
out lowp vec4 fragmentColor;
#endif
#if defined(WIREFRAME_RENDERING) && defined(GL_ES) && __VERSION__ < 300
/* This is needed also on desktop ES 3.0 emulation on NVidia 330.20 even though
fwidth() is part of GLSL ES 3.0 */
#if defined(WIREFRAME_RENDERING) && defined(GL_ES)
#extension GL_OES_standard_derivatives : enable