[whatwg] Offscreen canvas (or canvas for web workers).

Maciej Stachowiak mjs at apple.com
Wed Feb 24 00:09:44 PST 2010

On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:

> On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak <mjs at apple.com>  
> wrote:
>> - Raytracing a complex scene at high resolution.
>> - Drawing a highly zoomed in high resolution portion of the  
>> Mandelbrot set.
>> To be fair though, you could compute the pixels for those with just  
>> math,
>> there is no need to have a graphics context type abstraction.
> http://people.mozilla.com/~sicking/webgl/ray.html

I did not think it was possible to write a proper raytracer for  
arbitrary content all as a shader program, but I do not know enough  
about 3D graphics to know if that demo is correct or if that is  
possible in general. Point conceded though.

> http://people.mozilla.com/~sicking/webgl/juliaanim.html
> http://people.mozilla.com/~sicking/webgl/mandjulia.html

Neither of examples you posted seems to have the ability to zoom in,  
so I don't think they show anything about doing this to extremely high  
accuracy. But I see your point that much of this particular  
computation can be done on the GPU, up to probably quite high limits.  
Replace this example with your choice of non-data-parallel computation.

Very sexy demos, by the way.


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