The value of the timer, or zero if an error occurred.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function may be called from any thread.
@sa @ref time @sa @ref glfwGetTimerFrequency
Added in version 3.2.
Ingroup: input
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Returns the current value of the raw timer.
This function returns the current value of the raw timer, measured in 1 / frequency seconds. To get the frequency, call @ref glfwGetTimerFrequency.