On 16/05/18 22:09, Ilia Mirkin wrote:
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.
It also says noise is optional but there is no spec for it that I can see.
-ilia
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