Optional renderTexture stencil

[ivanpopelyshev]

That's for 5.1.4

First part of renderTexture stencil optimization: reduce the memory of renderTexture in case there are no masks. Comparing to v4 that was a downgrade.

Next PR's will add temporary pow2 renderbuffers for filters, and add a setting to allow run pixi in stencil-less webgl.

Open chrome or canary, single page, press SHIFT+ESC, look in GPU process memory

1000 renderTextures of size 256x256.

In windows stencil+depth is 32bit, and STENCIL8 cant help, it always creates both. +33% tax on potential mipmaps for colorbuffer.

That's 350kb colorbuffer per one renderTexture +256kb stencil/depth.

That means 350MB vs 600MB if we use stencil for every texture.

My measurements:

Empty playground, 140M total.

Stencil, 800M GPU total in chrome canary: https://www.pixiplayground.com/#/edit/8vkPJSK3IBCisZYdc6YC1

This branch, no stencil, 550M
https://www.pixiplayground.com/#/edit/3Bxzpc~OW18PHxsJ3wxcc

I dont know where else 60M goes, but I think we can ignore that.

Proof that forceStencil() code works, filter on app.stage : https://www.pixiplayground.com/#/edit/aN_YFvmR5W6UmSl6Han6X

[codecov-io]

Codecov Report

Merging #6099 into master will decrease coverage by 0.14%.
The diff coverage is 5.55%.

@@            Coverage Diff             @@
##           master    #6099      +/-   ##
==========================================
- Coverage   70.68%   70.53%   -0.15%     
==========================================
  Files         208      208              
  Lines       10589    10607      +18     
==========================================
- Hits         7485     7482       -3     
- Misses       3104     3125      +21

Impacted Files	Coverage Δ
...ckages/core/src/renderTexture/BaseRenderTexture.js	75.86% <ø> (ø)	⬆️
packages/core/src/mask/StencilSystem.js	30.76% <0%> (-0.61%)	⬇️
packages/core/src/framebuffer/FramebufferSystem.js	36.07% <5.88%> (-3.65%)	⬇️
packages/core/src/framebuffer/Framebuffer.js	45.09% <0%> (-7.85%)	⬇️

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[GoodBoyDigital]

nice work @ivanpopelyshev 👍