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Auto merge of #24386 - jdm:no-preserve-drawing-buffer, r=nox

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webgl: Clear the drawing buffer when preserveDrawingBuffer is false.

This adds an explicit clear operation to a webgl canvas when the preserveDrawingBuffer attribute is false when creating the context. Because we're not using double buffering this may end up making some demos worse (ie. a clear operation at a random time while drawing a frame), but this problem is expected to go away when #24256 is fixed and we move to a multi-buffered frame setup. This change is important at this time because so many babylon.js demos rely on the engine clearing the frame, per the specification.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #21132
- [x] There are tests for these changes

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bors-servo 2019-10-10 12:09:32 -04:00 • committed by GitHub
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2
tests/wpt/webgl/meta/conformance/context/context-creation.html.ini
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[context-creation.html]
expected: TIMEOUT