[Webkit-unassigned] [Bug 70099] OpenCL implementation of W3C Filter Effects Master Bug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70099





--- Comment #7 from Dirk Schulze <krit at webkit.org>  2011-10-17 10:48:12 PST ---
(In reply to comment #6)
> One more data point:
> 
> It's unlikely that Chrome will be able to use an OpenCL implementation of filters, at least not without lots of additional work. The reason is that Chrome's security model prevents WebKit from directly accessing the GPU. All graphics calls are proxied over to a separate process for validation and execution. The proxying mechanism is hidden behind our GraphicsContext3D implementation so any code using GC3D can take advantage of it. Adding support for executing sufficiently validated OpenCL code on a secondary process won't be trivial.
> 
> For this and all the reasons that Chris mentioned, I would also favor implementing filters using GC3D and GLSL instead of OpenCL.

OpenCL was created from the experience of implementations like CUDA from Nvidia. I strongly believe that OpenCL will replace GLSL in the long term. it has the benefit to not only to work with GPU, but all GPUs CPUs and DSPs of a system. 

The GC3D usage is no barrier. The opposite is the case. Many CL objects have objects with the same meaning in GL and can be used by OpenCL as well:

CL Buffer <-> GL Buffer
CL Image <-> GL Texture / GL RenderBuffers
CL Events <-> GL Sync
CL Context <-> GL Context
...

(The same with D3D objects btw.).

The bigger benefit: we can use HW acceleration for SVG in the short term. This isn't possible for OpenGL right now, because we don't support GC3D on SVG. And there is still a lot to do to make SVG use GC3D IMHO.

But again, I don't have any opposition agains GLSL. But we can just use it for HTML at the beginning, while SVG Filters is the only standardized specification at the moment.

I'm not very familiar with OpenGL. Is the shading language used by OpenGL ES 2.0 the same like GLSL?

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