Shared frame timing code. More...

#include "os/os_time.h"
#include "util/u_time.h"
#include "util/u_misc.h"
#include "util/u_debug.h"
#include "util/u_pacing.h"
#include "util/u_metrics.h"
#include "util/u_logging.h"
#include "util/u_trace_marker.h"
#include <stdio.h>
#include <assert.h>

Include dependency graph for u_pacing_compositor.c:

Data Structures
struct	frame

struct	pacing_compositor

Macros
#define	UPC_LOG_T(...) U_LOG_IFL_T(debug_get_log_option_log_level(), __VA_ARGS__)

#define	UPC_LOG_D(...) U_LOG_IFL_D(debug_get_log_option_log_level(), __VA_ARGS__)

#define	UPC_LOG_I(...) U_LOG_IFL_I(debug_get_log_option_log_level(), __VA_ARGS__)

#define	UPC_LOG_W(...) U_LOG_IFL_W(debug_get_log_option_log_level(), __VA_ARGS__)

#define	UPC_LOG_E(...) U_LOG_IFL_E(debug_get_log_option_log_level(), __VA_ARGS__)

#define	NUM_FRAMES 16

#define	PRESENT_SLOP_NS (U_TIME_HALF_MS_IN_NS)

Enumerations
enum	frame_state { STATE_SKIPPED = -1 , STATE_CLEARED = 0 , STATE_PREDICTED = 1 , STATE_WOKE = 2 , STATE_BEGAN = 3 , STATE_SUBMITTED = 4 , STATE_INFO = 5 }

Functions
static struct pacing_compositor *	pacing_compositor (struct u_pacing_compositor *upc)

static double	ns_to_ms (int64_t t)

static int64_t	get_percent_of_time (int64_t time_ns, uint32_t fraction_percent)

static int64_t	calc_total_comp_time (struct pacing_compositor *pc)

static int64_t	calc_display_time_from_present_time (struct pacing_compositor *pc, int64_t desired_present_time_ns)

static bool	is_within_of_each_other (int64_t l, int64_t r, int64_t range)

static bool	is_within_half_ms (int64_t l, int64_t r)

static struct frame *	get_frame (struct pacing_compositor *pc, int64_t frame_id)
	Gets a frame data structure based on the `frame_id`. More...

static struct frame *	create_frame (struct pacing_compositor *pc, enum frame_state state)
	Assign the next available frame ID, initialize the corresponding frame data with the ID and `state`, and return a pointer to that frame data. More...

static struct frame *	get_latest_frame_with_state_at_least (struct pacing_compositor *pc, enum frame_state state)
	Gets the most recent frame data whose state is greater than or equal to `state`, if any. More...

static struct frame *	do_clean_slate_frame (struct pacing_compositor *pc, int64_t now_ns)
	"Create" a frame ID in state frame_state::STATE_PREDICTED (by calling create_frame), and additionally initialize frame::desired_present_time_ns (with a crude estimate) and frame::when_predict_ns. More...

static struct frame *	walk_forward_through_frames (struct pacing_compositor *pc, int64_t last_present_time_ns, int64_t now_ns)
	Find the next possible present time for rendering that has not yet occurred, and create a frame/frame id with that prediction in it. More...

static struct frame *	predict_next_frame (struct pacing_compositor *pc, int64_t now_ns)

static void	adjust_comp_time (struct pacing_compositor pc, struct frame f)

static void	do_metrics (struct pacing_compositor pc, struct frame f)

static void	do_tracing (struct pacing_compositor pc, struct frame f)

static void	pc_predict (struct u_pacing_compositor upc, int64_t now_ns, int64_t out_frame_id, int64_t out_wake_up_time_ns, int64_t out_desired_present_time_ns, int64_t out_present_slop_ns, int64_t out_predicted_display_time_ns, int64_t out_predicted_display_period_ns, int64_t out_min_display_period_ns)

static void	pc_mark_point (struct u_pacing_compositor *upc, enum u_timing_point point, int64_t frame_id, int64_t when_ns)

static void	pc_info (struct u_pacing_compositor *upc, int64_t frame_id, int64_t desired_present_time_ns, int64_t actual_present_time_ns, int64_t earliest_present_time_ns, int64_t present_margin_ns, int64_t when_ns)

static void	pc_info_gpu (struct u_pacing_compositor *upc, int64_t frame_id, int64_t gpu_start_ns, int64_t gpu_end_ns, int64_t when_ns)

static void	pc_update_vblank_from_display_control (struct u_pacing_compositor *upc, int64_t last_vblank_ns)

static void	pc_update_present_offset (struct u_pacing_compositor *upc, int64_t frame_id, int64_t present_to_display_offset_ns)

static void	pc_destroy (struct u_pacing_compositor *upc)

xrt_result_t	u_pc_display_timing_create (int64_t estimated_frame_period_ns, const struct u_pc_display_timing_config config, struct u_pacing_compositor *out_upc)
	Creates a new composition pacing helper that uses real display timing information. More...

Variables
const struct u_pc_display_timing_config	U_PC_DISPLAY_TIMING_CONFIG_DEFAULT
	Default configuration values for display-timing-aware compositor pacing. More...

Detailed Description

Shared frame timing code.

Author: Jakob Bornecrantz jakob.nosp@m.@col.nosp@m.labor.nosp@m.a.co.nosp@m.m

Function Documentation

◆ create_frame()

static struct frame * create_frame	(	struct pacing_compositor *	pc,
		enum frame_state	state
	)

static

Assign the next available frame ID, initialize the corresponding frame data with the ID and state, and return a pointer to that frame data.

Fields other than frame::frame_id and frame::state are not modified, so may have old data in them. This may be a feature rather than a bug.

References frame::frame_id, get_frame(), and pacing_compositor::next_frame_id.

Referenced by do_clean_slate_frame().

◆ do_clean_slate_frame()

static struct frame * do_clean_slate_frame	(	struct pacing_compositor *	pc,
		int64_t	now_ns
	)

static

"Create" a frame ID in state frame_state::STATE_PREDICTED (by calling create_frame), and additionally initialize frame::desired_present_time_ns (with a crude estimate) and frame::when_predict_ns.

References create_frame().

◆ get_frame()

static struct frame * get_frame	(	struct pacing_compositor *	pc,
		int64_t	frame_id
	)

static

Gets a frame data structure based on the frame_id.

Note that this is done modulo the number of frame data structs we hold: the data in the frame you receive may not match the frame_id you passed!

See also: create_frame to create a frame id and (partially) initialize the frame data structure, do_clean_slate_frame for a more complete initialization

References frame::frame_id.

Referenced by create_frame().

◆ get_latest_frame_with_state_at_least()

static struct frame * get_latest_frame_with_state_at_least	(	struct pacing_compositor *	pc,
		enum frame_state	state
	)

static

Gets the most recent frame data whose state is greater than or equal to state, if any.

Returns: a frame pointer, or null if no frames have at least state

References pacing_compositor::next_frame_id.

◆ walk_forward_through_frames()

static struct frame * walk_forward_through_frames	(	struct pacing_compositor *	pc,
		int64_t	last_present_time_ns,
		int64_t	now_ns
	)

static

Find the next possible present time for rendering that has not yet occurred, and create a frame/frame id with that prediction in it.

Variable Documentation

◆ U_PC_DISPLAY_TIMING_CONFIG_DEFAULT

const struct u_pc_display_timing_config U_PC_DISPLAY_TIMING_CONFIG_DEFAULT

Initial value:

= {
    
    .present_to_display_offset_ns = U_TIME_1MS_IN_NS * 4,
    .margin_ns = U_TIME_1MS_IN_NS,
    
    .comp_time_fraction = 10,
    
    .comp_time_max_fraction = 30,
    .adjust_missed_fraction = 4,
    .adjust_non_miss_fraction = 2,
}

Default configuration values for display-timing-aware compositor pacing.

See also: u_pc_display_timing_config, u_pc_display_timing_create

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Function Documentation

◆ create_frame()

◆ do_clean_slate_frame()

◆ get_frame()

◆ get_latest_frame_with_state_at_least()

◆ walk_forward_through_frames()

Variable Documentation

◆ U_PC_DISPLAY_TIMING_CONFIG_DEFAULT