get_viewport().get_texture() appears too bright when exported to HTML5 (GLES3)

[JonathanPicques]

Godot version

3.3.2.stable.official

System information

Windows 10, Chrome / Firefox, RTX 2080

Issue description

I'm using get_viewport().get_texture() to capture the viewport to make a transition from a scene to another.

On Windows it works fine, but when using HTML5 export, the captured texture is way too bright:

Occurs on Chrome and Firefox

Steps to reproduce

Open minimal reproduction project and test on Windows and in Chrome

Minimal reproduction project

HTMLViewportTooBright.zip

[Calinou]

This is likely due to sRGB conversion happening when it shouldn't or vice versa). See #34062 and #48460.

The minimal reproduction project uses GLES3. Can you reproduce this after switching to the GLES2 renderer? The GLES3 renderer is generally too demanding to run well on HTML5.

[JonathanPicques]

@Calinou It works fine in the GLES2 renderer.

[kelteseth]

I can confirm that GLES2 works fine, whereas GLES3 is way too white.

[Calinou]

@kelteseth Please upload a minimal reproduction project to make this easier to troubleshoot.

[kelteseth]

@kelteseth Please upload a minimal reproduction project to make this easier to troubleshoot.

@Calinou Simply use the HTML5 preview and switch between GLES2 and GLES3. Here is my test project:
GodotHTML5ExportColors.zip