Jeff Gilbert 42df5c9dde Bug 1476327 - Test global upper bound for index buffer maxVertId. r=kvark
Particularly in CAD applications, it's common to call drawElements many times on small
ranges of indices. This causes our naive maxVertId range cache to degenerate.

In most cases, the index buffer won't actually contain any indices outside the associated
VAO buffers' ranges. We should test first against this global upper-bound, only testing
for an exact maxVertId for the subrange if the upper-bound test fails.

Differential Revision: https://phabricator.services.mozilla.com/D2488

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extra : moz-landing-system : lando
2018-07-30 15:33:10 +00:00
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