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Re: [Public WebGL] Loading WebGLBuffer from an HTMLImageElement



On Tue, Apr 12, 2011 at 4:45 AM, Vladimir Vukicevic <vladimir@pobox.com> wrote:
> It's a bit roundabout, but you can:
>
> - Load the image as an image
> - Draw it into an offscreen 2D <canvas> of the same size
> - Use getImageData
> - Use the returned ImageData's data buffer with buffer[Sub]Data
>
> Requires an extra step with the canvas drawing (and associated extra memory usage), but should be possible.

> ----- Original Message -----
>> It currently doesn't appear possible to load a WebGLBuffer from an
>> image, to use an image as vertex data. I can't do this manually, by
>> writing the image to a 2d Canvas and passing its ImageData to
>> bufferData, due to same-origin restrictions.

That's what I described here: it doesn't work, since getImageData
isn't allowed for cross-origin images.  A direct API can deal properly
with the cross-origin issues, in the same way texImage2D does.

-- 
Glenn Maynard
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