Comment # 13
on bug 75061
from Marek Olšák
If the program called MapBufferRange(MAP_INVALIDATE_BUFFER_BIT) instead of BufferData, I think it would be okay to crash: >From GL 4.4 spec: "MAP_INVALIDATE_BUFFER_BIT indicates that the previous contents of the entire buffer may be discarded. Data within the entire buffer are undefined with the exception of subsequently written data. No GL error is generated if subsequent GL operations access unwritten data, but the result is undefined and system errors (possibly including program termination) may occur." In other words, no context should access the buffer until UnmapBuffer() is complete, because there may be unwritten data.
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