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u/pacing: Predict present time and then calculate display time in fake pacer

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This commit is contained in:
Jakob Bornecrantz 2022-04-23 17:27:49 +01:00
parent 6c9c1e9249
commit b9b9ced43d
1 changed files with 12 additions and 12 deletions
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24
src/xrt/auxiliary/util/u_pacing_compositor_fake.c
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@ -38,9 +38,9 @@ struct fake_timing
uint64_t frame_period_ns;
/*!
* When the last frame was made.
* When the last frame was presented, not displayed.
*/
uint64_t last_display_time_ns;
uint64_t last_present_time_ns;
/*!
* Very often the present time that we get from the system is only when
@ -69,16 +69,16 @@ fake_timing(struct u_pacing_compositor *upc)
}
static uint64_t
predict_next_frame(struct fake_timing *ft, uint64_t now_ns)
predict_next_frame_present_time(struct fake_timing *ft, uint64_t now_ns)
{
uint64_t time_needed_ns = ft->present_to_display_offset_ns + ft->comp_time_ns;
uint64_t predicted_display_time_ns = ft->last_display_time_ns + ft->frame_period_ns;
uint64_t time_needed_ns = ft->comp_time_ns;
uint64_t predicted_present_time_ns = ft->last_present_time_ns + ft->frame_period_ns;
while (now_ns + time_needed_ns > predicted_display_time_ns) {
predicted_display_time_ns += ft->frame_period_ns;
while (now_ns + time_needed_ns > predicted_present_time_ns) {
predicted_present_time_ns += ft->frame_period_ns;
}
return predicted_display_time_ns;
return predicted_present_time_ns;
}
static uint64_t
@ -109,8 +109,8 @@ pc_predict(struct u_pacing_compositor *upc,
struct fake_timing *ft = fake_timing(upc);
int64_t frame_id = ft->frame_id_generator++;
uint64_t predicted_display_time_ns = predict_next_frame(ft, now_ns);
uint64_t desired_present_time_ns = predicted_display_time_ns - ft->present_to_display_offset_ns;
uint64_t desired_present_time_ns = predict_next_frame_present_time(ft, now_ns);
uint64_t predicted_display_time_ns = desired_present_time_ns + ft->present_to_display_offset_ns;
uint64_t wake_up_time_ns = desired_present_time_ns - ft->comp_time_ns;
uint64_t present_slop_ns = U_TIME_HALF_MS_IN_NS;
uint64_t predicted_display_period_ns = ft->frame_period_ns;
@ -198,8 +198,8 @@ u_pc_fake_create(uint64_t estimated_frame_period_ns, uint64_t now_ns, struct u_p
// 20% of the frame time.
ft->comp_time_ns = get_percent_of_time(estimated_frame_period_ns, 20);
// Make the next display time be in the future.
ft->last_display_time_ns = now_ns + U_TIME_1MS_IN_NS * 50;
// Make the next present time be in the future.
ft->last_present_time_ns = now_ns + U_TIME_1MS_IN_NS * 50;
// Return value.
*out_upc = &ft->base;