CPUParticles2D renders wrong with GLES2 on iOS if scene uses NinePatchRect, Panel, Button or ProgressBar

[volzhs]

Godot version:
Godot 3.1.1-stable official
Godot 3.1.2-alpha 8f3fea2
Godot 3.2-alpha 48d3458

OS/device including version:
iPad 6th gen / 12.3.1

Issue description:
CPUParticles2D renders wrongly when scene has NinePatchRect on GLES2.
Here is a table to show if it renders correctly.

CPUParticles2D	GLES2	GLES3
with NinePatchRect	X	O
without NinePatchRect	O	O

on GLES3

on GLES2

Steps to reproduce:

1. Add NinePatchRect and CPUParticles2D
2. run in on iOS device.

Minimal reproduction project:
test particle.zip

[volzhs]

cc @clayjohn

[clayjohn]

Is this a regression from 3.1.1? Or is the issue present there as well?

[volzhs]

@clayjohn 3.1.1-stable (official) has the same problem.

[volzhs]

3.2-alpha 48d3458 also has the same issue.

[volzhs]

@clayjohn would you have a look for this? 😃

[clayjohn]

Im sorry, I don't have an IOS device to test on, so I don't even know where to start... :/

I looked through the code when you first posted this, but nothing jumped out at me. Without being able to reproduce I can't really do anything more.

[volzhs]

thank you for your time anyway. 👍

[akien-mga]

Comment from @klimi15 in #34637:

I have traced down the Bug a little more. Since I had no NinePatchRect , it also effects Panels,Buttons,Progress Bars. Not Canvas Items in generell though with Labels in the scene it works.

When those are in the Scene, the GLBindTexture does not seem to work. I have no idea why though.

[akien-mga]

NinePatchRect, Panel, Button and ProgressBar are all GUI elements which can use nine-patch slicing feature for their stylebox textures, so the issue is probably related to that codepath.

[clayjohn]

I would like for this to get fixed, but unfortunately we don't have anyone stepping up that can work on iOS, so bumping to 4.0.

[clayjohn]

Good news! I am fairly certain this is the same underlying bug as #38318 which seems to be solved by #38318 (comment)

If it is, we should have a fix on the way shortly. :)

[akien-mga]

Can you confirm if this is now fixed in 3.2.3 / 3.2.4-beta1?

[volzhs]

tested with 3.2.4-beta 150f9ce
it still happens, but a little bit different.

[clayjohn]

@volzhs did you disable half floats using the added project setting?

[volzhs]

@clayjohn all settings are default.

[clayjohn]

@volzhs do you mind trying again with the disable_half_float setting?

[volzhs]

@clayjohn yeah. that made it work. I just read the description of this option.

[clayjohn]

@volzhs thanks for trying again!

I will close this as it is fixed by #38318