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Posted 12 April 2013 - 12:40 PM
Posted 12 April 2013 - 04:47 PM
The rectangle locked just modifies the dirty region of a texture or surface; i.e. the region that needs to be written back to the GPU after you unlock. What you're seeing is normal enough; you can test and confirm this by locking a small rect, writing something like all-white to the texture, unlocking and seeing what part of the texture was actually updated when you use it next.
It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.