Follow-up to #4602. Overall the PR was good, but there are a few extra small changes that should go in. In order of priority:
1) The `exitLoop`, `skipMission`, and `skipTraining` functions should check for campaign mode.
2) The `isVisible` virtvar should be changed to a function, because calling it may have side effects. In standard usage, the briefing formula is evaluated exactly once per stage on briefing initialization, so scripts should follow this convention.
3) The `hasGoalsSlide` function should be called `hasGoalsStage`, because "stage" is the common terminology in FSO.
4) Paging out mission messages is already done in `game_level_close` and should be removed from not only the scripting method but the method it was based on.
5) For consistency, unused parameters should use the `SCP_UNUSED` macro.
6) The `isTraining` flag check can be slightly streamlined using the double-not trick.
* Applying directional brightness profile value, disconnected spec flags and made specular light always equal to diffuse light
* Switched over to new command line arguments
* Wire lab up to new lighting controls, and provide backwards-compatible defaults for emissive.
* cleanup unused new function
* make static some functions that can be static
* revise command-line and emissive handling
* handled specular sun depreciation and general removal of specular value handling
* Removed specular light color as a separate value in the uniform buffers.
* cleanup of leftover/post-rebase specular references
* further post-rebase repair of light flags command line and leftover specular
* move techroom/selection/breifing 'room' lights to a common function and
augment lighting setup for current rendering
* fixed some mishandling of lighting modifiers.
* Addressed code clarity and comments from review
* Documentation (+6 squashed commit)
Squashed commit:
[ea8550b54] Resolve errors
[9ab0a576d] Add way to count number of elements in the arrays
[eb74146cc] Correct this boolean check
[60fbc6008] Missed one
[78e65a4b7] Avoid naming collision
[4ea5ddead] Clean unneeded log print and compare like variables
* Adding simulator room here seems like a pretty safe option
* Scpui API to access to build the tech room cutscene list and a few methods to help playing the cutscene and return to the menu accurately
* Scpui API access for credits related data
* # This is a combination of 7 commits.
Clean unneeded log print and compare like variables
Avoid naming collision
Missed one
Correct this boolean check
Add way to count number of elements in the arrays
Resolve errors
Documentation
* Address feedback
* Address feedback
* Add virtvar isCampaignMission
* API elements required for the Briefing
* Resolve errors
* Check if the mission is a Scramble mission
* Add one missed flag check
* Slight API naming adjustment
* Address feedback
* Address Feedback again
* Differentiate var names
add `getDirectiveLines` and `setPosition` script functions
properly error if trying to set a HUD gauge name
remove the unneeded `Directive_frames_loaded` variable
improve accuracy of SEXP help for HUD gauge operators
* Add drop shadows to HUD text
* Add drop shadow to reticle
* Add control to toggle Drop Shadows
* Double render reticle shadows
* Use gauge_color instead of creating a temp var
* Add shadows to ETS gauges
* Set shadow default to false and adjust formatting
* Restore numbering for controlsconfig
* Move colors up one level and generalize
* Initialize this first
* These are common to both all Briefings, so put them in the general Briefing category
Protects `Fiction_viewer_active_stage` if it reads a stage of -1 (it would have thrown a vector access error because the index is out of range). Also, given a lot of other scripting functions have additional built in error checks, I just added those to the fiction viewer functions.
Goober5000