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put these in one `fog` object like `this.passes` 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[x] Tweak fade distance and density\r\n- [x] Change tile SSE when in fog\r\n- [x] Use preprocessor instead of conditional when enabled.\r\n- [x] Swap shader when a tile is or is not in fog\r\n- [ ] Performance\r\n- [ ] Tests\r\n- [ ] Reference doc including advice on the performance / visual quality trade-off\r\n- [ ] Update 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