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* Adds lazyloading to the asset subsystems (#69454) * Adds lazyloading to the asset subsystems This currently applies only to spritesheets because of how monumentally expensive they are. If an asset is requested it will immediately be fully loaded, but otherwise we slowly load them in with a separate subsystem. This allows us to not hold up initialize with hair stuff. Saves roughly 33% (16 seconds with LOW_MEMORY_MODE) of initialize on my machine My target is something closer to the 9 second init that had back in 2019, this is a good first step. Lets see how much more we can do yeah lads? Co-authored-by: san7890 <the@ san7890.com> * Adds lazyloading to the asset subsystems Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com> Co-authored-by: san7890 <the@ san7890.com>
Asset cache system
Framework for managing browser assets (javascript,css,images,etc)
This manages getting the asset to the client without doing unneeded re-sends, as well as utilizing any configured cdns.
There are two frameworks for using this system:
Asset datum:
Make a datum in asset_list_items.dm with your browser assets for your thing.
Checkout asset_list.dm for the helper subclasses
The simple subclass will most likely be of use for most cases.
Call get_asset_datum() with the type of the datum you created to get your asset cache datum
Call .send(client|usr) on that datum to send the asset to the client. Depending on the asset transport this may or may not block.
Call .get_url_mappings() to get an associated list with the urls your assets can be found at.
Manual backend:
See the documentation for /datum/asset_transport for the backend api the asset datums utilize.
The global variable SSassets.transport contains the currently configured transport.
Notes:
Because byond browse() calls use non-blocking queues, if your code uses output() (which bypasses all of these queues) to invoke javascript functions you will need to first have the javascript announce to the server it has loaded before trying to invoke js functions.
To make your code work with any CDNs configured by the server, you must make sure assets are referenced from the url returned by get_url_mappings() or by asset_transport's get_asset_url(). (TGUI also has helpers for this.) If this can not be easily done, you can bypass the cdn using legacy assets, see the simple asset datum for details.
CSS files that use url() can be made to use the CDN without needing to rewrite all url() calls in code by using the namespaced helper datum. See the documentation for /datum/asset/simple/namespaced for details.