* This helps those who have chosen the dark theme where rich resource text uses
the default window text colour assuming it's a contrasting colour against the
background (except when highlighted).
* We need to calculate the fixed data length properly even when there is no
repeated data, so that pagination doesn't kick in on the data that is needed
for the fixed region.
* We store the compiler used (when known) in shader debug info and use that to
select the compiler for editing as even higher priority than the default for a
given language/encoding combination.
* We also ensure that for known tools we add the input and output parameters
last, after any custom parameters, so that they are always present regardless
of what the user puts in.
* This allows us to more accurately display those that have been modified since
the last step, when a source-level step covers multiple instruction-level
steps.
* We also do our own sorting of source variables based on how recently they were
updated. This applies in both directions, so stepping backwards and
'reversing' a variable change will also count as a recent update.
* Since the source vars data doesn't change for a given instruction, we can pre-
calculate it and save time on re-calculating per-state.
* Note callstack *can* change per-state on SPIR-V where the same instruction can
be reached by different flow paths, so the callstack remains part of the per-
state data.
* We can't debug geometry shaders but we can scroll to them, as long as we have
the primitive. We can't differentiate instances currently without passing that
data through from the VS (and through tessellation, if it exists).
* This also disables the debug and goto buttons for printfs from shader stages
that don't support those operations.
* The GL clip origin when changed from lower left to upper left will also invert
the face culling sense. This is deliberate to counteract the fact that
otherwise CW wound triangles would be CCW wound, so the flip means that if
GL_CCW is the front face state and back faces are culled, then visibly CCW
wound triangles will be culled.
baldurk