The open source OpenXR runtime
u/pacing: Add minimum compositor time
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src/xrt/auxiliary/util/u_pacing_compositor_fake.c
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src/xrt/auxiliary/util/u_pacing_compositor_fake.c
···
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*
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*/
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DEBUG_GET_ONCE_FLOAT_OPTION(min_comp_time_ms, "U_PACING_COMP_MIN_TIME_MS", 3.0f)
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/*!
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* A very simple pacer that tries it best to pace a compositor. Used when the
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* compositor can't get any good or limited feedback from the presentation
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// 20% of the frame time.
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ft->comp_time_ns = get_percent_of_time(estimated_frame_period_ns, 20);
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// Or at least 2ms.
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if (ft->comp_time_ns < U_TIME_1MS_IN_NS * 2) {
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ft->comp_time_ns = U_TIME_1MS_IN_NS * 2;
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// Or at least a certain amount of time.
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float min_comp_time_ms_f = debug_get_float_option_min_comp_time_ms();
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uint64_t min_comp_time_ns = time_ms_f_to_ns(min_comp_time_ms_f);
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if (ft->comp_time_ns < min_comp_time_ns) {
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ft->comp_time_ns = min_comp_time_ns;
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}
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// Make the next present time be in the future.