0adbdcf45c
A draw whose key has no entry captured its stages, built a variant per stage (a copy of every captured region) and inserted a draw entry. A key that never comes back paid for the variants and the entry for nothing, and its entry pushed a live one out of the cache. Draws whose user data changes every frame are such keys. The driver now remembers the keys it has seen once, in a table of four-way buckets holding four times the cache's size in keys. A key gets its entry at its second sight; a key that already has an entry still takes new variants at once. A full bucket replaces its oldest key, so keys that share a bucket do not push each other out until more than four of them come between two sights of one. Test: agc_driver_draw_cache_reuse draws three times. The first two draws find no entry, one entry is inserted, and the third draw hits it. A sighting table of one bucket keeps two keys drawn in turn and replaces its oldest key when full. |
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