gallium/docs: document interface changes for timestamp query
the query type is already documented
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@ -128,6 +128,8 @@ The integer capabilities:
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alignment of pipe_constant_buffer::buffer_offset.
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* ``PIPE_CAP_START_INSTANCE``: Whether the driver supports
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pipe_draw_info::start_instance.
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* ``PIPE_CAP_QUERY_TIMESTAMP``: Whether PIPE_QUERY_TIMESTAMP and
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the pipe_screen::get_timestamp hook are implemented.
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.. _pipe_capf:
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@ -399,3 +401,11 @@ resource_destroy
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Destroy a resource. A resource is destroyed if it has no more references.
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get_timestamp
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^^^^^^^^^^^^^
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Query a timestamp in nanoseconds. The returned value should match
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PIPE_QUERY_TIMESTAMP. This function returns immediately and doesn't
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wait for rendering to complete (which cannot be achieved with queries).
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