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This fixes a bug that was introduced three years ago in bug 1268854. What happened was that the final pass over the polygon assumed that the current polygon was living in plane[0]. But due to the double buffering, the "current" polygon alternates between plane[0] and plane[1]. And bug 1268854 had introduced an early exit so that we could hit the final pass at a time where the current, now empty, polygon was in plane[1]. So we would incorrectly treat all 32 points in plane[0] as part of the final polygon. This bug was responsible for intermittently unreasonable numbers in CompositorOGL's fill rate / overdraw overlay, and, since changeset cc84a0e9d5ddde198422f4f11ab6bf85f631d5f0, also caused CompositorOGL to execute unnecessary draw calls. Differential Revision: https://phabricator.services.mozilla.com/D44312 --HG-- extra : moz-landing-system : lando |
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