[CSS Shaders] Reuse precompiled shaders across elements

[Alexandru Chiculita]

When the style of an element changes the shader is recompiled and uploaded to the GPU. Reuse the shaders as much as possible.

[Alexandru Chiculita]

Created attachment 153910 [details]
Patch V1

[Dean Jackson]

Comment on attachment 153910 [details]
Patch V1

View in context: https://bugs.webkit.org/attachment.cgi?id=153910&action=review

Cool!

> LayoutTests/css3/filters/custom/custom-filter-shader-reuse.html:26
> +            function runTest()
> +            {

{ on line above

> Source/WebCore/ChangeLog:10
> +        CustomFilterGlobalContext now acts as a cache for the compiled shaders. Note that only the shaders displayed on screen
> +        are cached, making it useful in animations or when more elements share the same shader filter.

maybe "only the shaders displayed on the page" because I guess a filtered element might be scrolled off screen?

> Source/WebCore/ChangeLog:20
> +        is allowed to be null. A null strings is the placeholder for the default shader.

typo: strings -> string.

> Source/WebCore/platform/graphics/filters/CustomFilterCompiledProgram.h:82
> +    // Note that, CustomFilterGlobalContext doesn't not keep a strong reference to 
> +    // the CustomFilterCompiledProgram.

typo: no comma necessary

[Alexandru Chiculita]

(In reply to comment #2)

Thanks! I will submit an updated patch soon.

[Alexandru Chiculita]

Landed in http://trac.webkit.org/changeset/124897 .