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由 jp9000 提交于
Staging surfaces with GL originally copied to a texture and then downloaded that copied texture, but I realized that there was really no real need to do that. Now instead they'll copy directly from the texture that's given to them rather than copying to a buffer first. Secondly, hopefully fix the mac issue where the only way to perform an asynchronous texture download is via FBOs and glReadPixels. It's a really dumb issue with macs and the amount of "gotchas" and non-standard internal GL functionaly on mac is really annoying.
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