1691859 - Emulate mix-blend-mode without KHR_blend_equation_advanced in WR when possible

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, enhancement)

Description

[Lee Salzman [:lsalzman]]

Multiply, screen, and exclusion blend modes can be implemented with either basic blending or dual-source blending. It would be nice to at least specifically handle multiply without requiring the KHR_advanced_blend_equation extension or going through the brush_mix_blend shader.

Comment 1

[Lee Salzman [:lsalzman]]

Attachment: Bug 1691859 - Emulate mix-blend-mode without KHR_blend_equation_advanced in WR when possible. r?gw

We don't actually need to use brush_mix_blend or KHR_blend_equation_advanced for multiply, screen,
and exclusion modes. Screen and exclusion can be done with simple blending, and multiply can be
done with dual-source blending. Since multiply is the most common mix-blend mode, and dual-source
blending is also common on the desktop with our ANGLE driver, this should be a significant boost
for mix-blend-mode performance for us across.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/378542fd1298
Emulate mix-blend-mode without KHR_blend_equation_advanced in WR when possible. r=gw

Comment 3

[Bogdan Tara[:bogdan_tara | bogdant]]

https://hg.mozilla.org/mozilla-central/rev/378542fd1298