The Queen of Snakes: Blue triangles everywhere

[angstsmurf]

Describe the bug
In Ruffle, this game throws up distorted blue triangles everywhere, which apart from being ugly hide information and make the game unplayable. They seem to cover all mouse-click responsive hotspots.

Game: http://www.jo99.fr/wp-content/uploads/2013/05/templeserpent11.swf

Expected behavior
There should only be a blue triangle at the edge where you can go. See https://youtu.be/jYqShMqJOoU?t=13

Is the problem with the Ruffle desktop app, extension, or self-hosted version?
This is the Ruffle desktop app, nightly 2021-05-31.

What platform are you using?
macOS 11.4, Macbook Pro 15", 2016.

[relrelb]

Seems like this uses BlendMode::Erase, which is currently unimplemented (#58).

[angstsmurf]

Thanks for looking into this!

[Lord-McSweeney]

Fixed by #8262.

[angstsmurf]

Have you tested it? Definitely not fixed here.

EDIT: Check the YouTube video I linked above to see what it is supposed to look like.

[ActionWavele]

yeah, I think things need to be tested if you're closing issues.

[pdewacht]

I've spent some time poking at this. The problem seems to be that ruffle doesn't render BlendMode::Erase correctly if there's no BlendMode::Layer first. This is a reduced test case:
templeserpent11-testcase.zip

[angstsmurf]

Seems to be fixed by 0786727.