Ebiten: Invalid rendering on iOS (Wasm)

[hajimehoshi]

http://hajimehoshi.github.io/go-inovation/wasm/

This screenshot is by Pontus Leitzler.

GopherJS ver (http://hajimehoshi.github.io/go-inovation/) works correctly.

[hajimehoshi]

It looks like vertices are correct, but texture data is broken. Hmm...

[hajimehoshi]

https://github.com/hajimehoshi/ebiten/issues/721 should be fixed in the first place?

[hajimehoshi]

With Go 1.12 beta2, the go-inovation app shows the below error on iOS (not desktops).

Unhandled Promise Rejection: Error: import function go:runtime.scheduleTimeoutEvent must be callable

[hajimehoshi]

Before this, we'd need to fix the OOM issue #678

[hajimehoshi]

With Go 1.13, the result has become more psychedelic...

[hajimehoshi]

Maybe other examples doesn't cause this issue, but examples/blocks caused. This doesn't extend the internal images, so extending logic is not the culprit. Hmm

[hajimehoshi]

diff --git a/examples/blocks/blocks/titlescene.go b/examples/blocks/blocks/titlescene.go
index 7b6c47fa..15782744 100644
--- a/examples/blocks/blocks/titlescene.go
+++ b/examples/blocks/blocks/titlescene.go
@@ -32,7 +32,9 @@ func init() {
        if err != nil {
                panic(err)
        }
-       imageBackground, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
+       println(img.At(16, 15).(color.RGBA).R, img.At(16, 15).(color.RGBA).A)
+       println(img.At(16, 16).(color.RGBA).R, img.At(16, 16).(color.RGBA).A)
+       imageBackground, _ = ebiten.NewImageFromImage(img, ebiten.FilterNearest)
 }

 type TitleScene struct {

Expected:

255 255
204 255

On iOS Safari:

0 255
255 255

Then, it looks like something is broken on Wasm side, not GPU side.

[hajimehoshi]

https://github.com/golang/go/issues/32635 Reported

[dmitshur]

Can you try again with iOS 13? See https://github.com/golang/go/issues/32635#issuecomment-533888835.

Edit: I tried the link in the original issue, and can confirm iOS 13 fixes the problem.

This is with iOS 12.4.1:

This is with iOS 13:

Unfortunately, I couldn't test on the same device, but the chance of this being due to hardware difference rather than software seems low.

[hajimehoshi]

OK I'll try to update my device to iOS 13 first...

[hajimehoshi]

Unfortunately my devices don't get iOS 13 yet. I need more time.

[hajimehoshi]

Hmm, mine is iPhone 6 (not S) and iOS 13 never comes. I'd need to buy a new iPhone :-P

[hajimehoshi]

Fixed by iOS 13.