Port Scrolling Texture Interpolation over from 2Ship

[leggettc18]

Big thanks to @Eblo and @NEstelami, this is porting over the implementation by @NEstelami from 2ship and applying to Ship's code.

Known issues with the current implementation, some of these may just be errors on my part, some are deeper issues:

• Deku Tree kind of "shimmers" best I can tell he has a scrolling texture for his death animation and it keeps trying to interpolate to the next frame, but in game the texture doesn't actually start scrolling until later.
• Like Likes have a similar thing going on when they are stunned.
• Great Fairy Fountain walls need to be double checked. They might be fine but they are visually busy so it's hard to tell. (Now that I've had a chance to directly compare these, they are interpolating fine after all)
• Same for Spiritual Stones, they might be fine but I can't even really tell where the scrolling texture even is.
• Water Temple Waterfall room before Dark Link, water does not appear to be interpolated correctly.
• Water Spouts (like the one covering the map chest in Water Temple) aren't interpolating correctly.
• Logo Screens (LUS and N64 logos) have weird flickering happening when you soft-reset the game. I either accidentally fixed this or it is Debug build exclusive, need to do more investigation.
• Blue Warps need to be double checked, they might be fine but something seemed off when I last looked at one. I copied what 2ship did. It looks fine in game as far as I can tell.
• Morpha's inner core looks fine but the outer shell looks off. (Did a direct comparison, Morpha just always looked like that)
• Boss Souls may not look right, I haven't checked them yet but I have a feeling I made a mistake there somewhere.

Might be more too, haven't finished my vanilla playthrough for playtesting. Overall my playtest playthrough has been going well, and seeing all the smoothed out scrolling textures is very pleasing on the eyes. Areas like Zora's Domain and Water temple are quite stunning with the scrolling textures interpolated. Wanted to go ahead and get the PR opened for this so other people could have a gander and see if they can find any issues I haven't noticed.

Build Artifacts

• soh-linux.zip
• soh-windows.zip
• soh-mac.zip

[leggettc18]

Removing do-not-merge as I think the "issues" that are left are either fixed or not actually issues, just me having trouble actually verifying if they are correct visually. Playtesting and feedback encouraged!

[leggettc18]

Found some minor issues with Phantom Ganon and the fire in the cutscene with the deku tree sprout afterwards, have PG already fixed locally but the fire in the cutscene is giving me a hard time.

[leggettc18]

On closer inspection I think the fire might have been fine, everything I've tried to do to fix it has looked worse. I think it looking choppy to me before might have been an optical illusion since there is a low enough offscreen that I only see the points of the animation where flames are higher.