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On some (primarily older, integrated) drivers, we see significant time in CPU stalls during updates to the vertex data textures. As a short term fix, this patch creates an array of vertex data textures, and rotates which set of them are in use each frame. There are better long-term options (such as porting the GPU cache scatter method, or perhaps using UBO/SSBOs here), but this is a simple workaround for now. Differential Revision: https://phabricator.services.mozilla.com/D70775 --HG-- extra : moz-landing-system : lando