[QGIS-Developer] Use of WebGL en Javascript (in Qt6 ?)

[Martin Dobias]

Hi Richard

If I understand correctly, you could probably write a simple QGIS python
plugin to do this as well, without any javascript/webgl magic needed -
using gdalwarp to georeference the original maps and gdal's VRT to stitch
them together. Maybe just with the downside that it would not work "on the
fly", and the maps would need to be downloaded beforehand.

WebGL (or in our case its original desktop counterpart, OpenGL) usage in
those maps is to make the map rendering faster - this is something that
MapBox/MapLibre has been working on for quite some time. I would also like
to have the QGIS' 2D canvas rendered with OpenGL (or DirectX / Metal /
Vulkan) for faster map refreshes - but that's going to be a lot of work...
maybe QGIS 5.0 :-)

Cheers
Martin


On Mon, Sep 30, 2024 at 8:41 PM Richard Duivenvoorde via QGIS-Developer <
qgis-developer at lists.osgeo.org> wrote:

> Hi Devs,
>
> Anybody an idea about any possibilities to use WebGL and/or
> java/typescript in Qt6 (QGIS 4)?
>
> Context: in the archive/museum world old maps are often made available via
> de IIIF (triple-I-F) standard.
> Which nowadays has a georef standard:
> https://iiif.io/api/extension/georef/
>
> A dutch guy, created https://allmaps.org/
> A site in which you can 'easily' georeference those old images AND which
> keeps hold of the GCP's created.
>
> So having a georeference IIF service/image it is easy to load it,
> georeferenced via the allmaps url (which is actually a json, referencing
> the IIIF service AND the GCP info:
>
>
> https://viewer.allmaps.org/?url=https%3A%2F%2Fannotations.allmaps.org%2Fmanifests%2Fc390af06ea724803
>
> All this is typescript/nodejs/javascript.
>
> Rendering/transformation is done life on a WebGL 'canvas'.
>
> In my ideal world, it would be possible to load the same url as above in
> QGIS, maybe do the realtime transformation in an 'offsite/buffered' WebGL
> canvas?
>
> But maybe I'm too eager :-)
>
> Regards,
>
> Richard Duivenvoorde
>
>
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