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We often need the same native texture objects for new textures. This commit try to avoid destroying and creation of this textures by pooling them. This should be a big performance gain for some efb2ram games as they may overwrites partially a cached texture (which would be deleted) and afterwards try to read it. Creating/destroying sounds like an easy task, but it isn't. eg the nvidia ogl driver synchonize their threads do avoid use-after-free issues.