[PATCH 3/8] wined3d: Implement SM5 deriv_rtx_coarse instruction.

[Józef Kucia]

On Mon, Jul 25, 2016 at 12:48 PM, Henri Verbeet <hverbeet at gmail.com> wrote:
> It doesn't matter that much, but is there any reason
> shader_glsl_map2gl() can't handle these?

I've introduced shader_glsl_derivative() mostly to make the check for
ARB_derivative_control simpler. I could have reordered patches as well
to avoid introducing shader_glsl_derivative() at all, but I wasn't
sure if someone won't be in favor of replacing the patch 124699 -
"wined3d: Require ARB_derivative_control for SM5." with a fallback to
dFdx()/dFdy().