On Wed, May 16, 2018 at 8:04 AM, Timothy Arceri <tarc...@itsqueeze.com> wrote: > > > On 16/05/18 21:12, Ilia Mirkin wrote: >> >> From the spec, >> >> """ >> The built-in derivative functions dFdx, dFdy, and fwidth are >> optional, and >> must be enabled by >> >> #extension GL_OES_standard_derivatives : enable >> >> before being used. >> """ >> >> Sounds like you need an application override? > > > The ES spec has no such wording is simply states: > > "dFdx(), dFdy(), and fwidth() are made optional."
That is under the heading of "Changes from Revision 59 of the OpenGL Shading Language specification:", i.e. desktop GLSL. There isn't a single other reference to those functions anywhere else in https://www.khronos.org/files/opengles_shading_language.pdf . The "optional" is in reference to it being moved out to an extension rather than being part of the core language. -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
