This reworks how we compute the bloom buffer size. The main changes are:
- The BloomOptions.resolution is changed to height instead of minor axis.
This keeps a consistant look of the bloom regardless of the viewport.
- The anamorphism setting now dilates the bloom rather than to compress
it (in the other direction), which maintains the same amount of bloom.
However, the resolution decreases meaning that the user might need to
adjust resolution and/or levels.
- limit the resolution do 2048 which is gles minspec.
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