The open source OpenXR runtime
u/pacing: Add U_PACING_COMP_TIME_FRACTION_PERCENT option
This adds the option U_PACING_COMP_TIME_FRACTION_PERCENT that allows
us to set the default compositor time as a percentage of the estimated
frame time.
This will be an easier way to tweak compositor time independently of
the particular HMD frame rate, when doing so is necessary for
performance reasons. This is currently often the case on NVIDIA
proprietary driver when used together with
XRT_COMPOSITOR_USE_PRESENT_WAIT=TRUE
Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2526>
+8
-5
+8
-5
src/xrt/auxiliary/util/u_pacing_compositor_fake.c
+8
-5
src/xrt/auxiliary/util/u_pacing_compositor_fake.c
···
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#include <stdio.h>
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#include <assert.h>
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#include <math.h>
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/*
···
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DEBUG_GET_ONCE_FLOAT_OPTION(present_to_display_offset_ms, "U_PACING_COMP_PRESENT_TO_DISPLAY_OFFSET_MS", 4.0f)
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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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DEBUG_GET_ONCE_FLOAT_OPTION(comp_time_fraction_percent, "U_PACING_COMP_TIME_FRACTION_PERCENT", 20.0f)
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DEBUG_GET_ONCE_BOOL_OPTION(live_stats, "U_PACING_LIVE_STATS", false)
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// We keep track of this number of frames.
···
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}
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static int64_t
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get_percent_of_time(int64_t time_ns, uint32_t fraction_percent)
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get_percent_of_time(int64_t time_ns, double fraction_percent)
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{
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double fraction = (double)fraction_percent / 100.0;
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double fraction = fraction_percent / 100.0;
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return time_s_to_ns(time_ns_to_s(time_ns) * fraction);
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}
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···
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.max = +40.0,
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};
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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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// Set comp_time_ms to a percentage of the frame time.
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float comp_time_fraction_percent = fabs(debug_get_float_option_comp_time_fraction_percent());
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ft->comp_time_ns = get_percent_of_time(estimated_frame_period_ns, comp_time_fraction_percent);
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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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double min_comp_time_ms_f = debug_get_float_option_min_comp_time_ms();
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int64_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) {