Returns the current time value from Cogl's internal clock.
This clock is used for measuring times such as the presentation time in a FrameInfo.
This method is meant for converting timestamps retrieved from Cogl to other time systems, and is not meant to be used as a standalone timing system. For that reason, if this function is called without having retrieved a valid (non-zero) timestamp from Cogl first, it may return 0 to indicate that Cogl has no active internal clock.
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a Context pointer |
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the time value for the Cogl clock, in nanoseconds from an arbitrary point in time, or 0 if Cogl doesn't have an active internal clock. |