The open source OpenXR runtime
u/frame_times_widget: Optimize FPS calculation
Do so using precomputed frame timings.
authored by
meng.jiao
and committed by
Jakob Bornecrantz
7e22fa57
ad6f7de0
+4
-6
+4
-6
src/xrt/auxiliary/util/u_frame_times_widget.h
+4
-6
src/xrt/auxiliary/util/u_frame_times_widget.h
···
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// update fps only once every FPS_NUM_TIMINGS
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if (widget->index == 0) {
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float total_s = 0;
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float total_ms = 0;
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// frame *timings* are durations between *times*
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int NUM_FRAME_TIMINGS = FPS_WIDGET_NUM_FRAME_TIMES - 1;
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for (int i = 0; i < NUM_FRAME_TIMINGS; i++) {
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uint64_t frametime_ns = widget->times_ns[i + 1] - widget->times_ns[i];
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float frametime_s = (float)time_ns_to_s(frametime_ns);
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total_s += frametime_s;
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total_ms += widget->timings_ms[i];
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}
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float avg_frametime_s = total_s / ((float)NUM_FRAME_TIMINGS);
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widget->fps = 1.f / avg_frametime_s;
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float avg_frametime_ms = total_ms / ((float)NUM_FRAME_TIMINGS);
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widget->fps = 1000.f / avg_frametime_ms;
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}
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widget->times_ns[widget->index] = new_frame_time;