Bug: crash when WebGL2RenderingContext is not available

[elsassph]

Current Behavior

PixiJS 8 can't start when running in an older browser without webGl 2.0 support:

Uncaught (in promise) ReferenceError: WebGL2RenderingContext is not defined

Expected Behavior

I make apps for connected TVs - a lot of models still don't support webGl 2.0. Some even don't support webGl at all.

It would be great if Pixi 8 would gracefully support older browsers supporting only webGl 1.0.

Steps to Reproduce

Run any Pixi app on an TV 3+ years old.

Environment

• pixi.js version: 8.0
• Browser & Version: Chrome/53.0.2785.34 Safari/537.36
• OS & Version: webOS 4.10

Possible Solution

I tried declaring a mock WebGL2RenderingContext class (undefined also fails further during init) to pass the webGl detection but then gl errors happen and nothing renders:

PixiJS Warning:  Provided WebGL context does not support 32 index buffer, large scenes may not render correctly
WebGL: INVALID_ENUM: activeTexture: texture unit out of range
[.Offscreen-For-WebGL-0x123eb0]GL ERROR :GL_INVALID_VALUE : glUniform1iv: texture unit out of range

Line of activeTexture error is: https://github.com/pixijs/pixijs/blob/dev/src/rendering/renderers/gl/texture/GlTextureSystem.ts#L190

Additional Information

No response

[bigtimebuddy]

@GoodBoyDigital you added support for WebGL1 in v8, right?

[elsassph]

@bigtimebuddy I see there seem to be support for webGl 1, but it crashes on systems without support for webGl 2.

[bigtimebuddy]

Yeah, I gathered that. If I had to guess, we added the internal supported for WebGL1, but probably didn't actually test running in a WebGL1-only environment.

[Zyie]

hey @elsassph what version of v8 are you using?

i believe this #10351 should fix the issue and was released in 8.0.4

[erikdubbelboer]

@Zyie the issue is still present in 8.0.4. See: #10401

[Zyie]

Yeah this is definitely still an issue, we will look into it!

[mwx0621]

For Safari in IOS 13.3, there is no global WebGL2RenderingContext in browser. Though this version of safari support webgl2, pixi will crash with "Can't get variable: WebGL2RenderingContext" when calling initFromContext.

[Zyie]

This should be fixed in 8.1.0