framerate_type.h File Reference

Types for recording game performance data. More...

#include "stdafx.h"
#include "core/enum_type.hpp"

Go to the source code of this file.

Data Structures
class	PerformanceMeasurer
	RAII class for measuring simple elements of performance. More...
class	PerformanceAccumulator
	RAII class for measuring multi-step elements of performance. More...

Typedefs
typedef uint64_t	TimingMeasurement
	Type used to hold a performance timing measurement.

Enumerations
enum	PerformanceElement {   PFE_FIRST = 0 , PFE_GAMELOOP = 0 , PFE_GL_ECONOMY , PFE_GL_TRAINS ,   PFE_GL_ROADVEHS , PFE_GL_SHIPS , PFE_GL_AIRCRAFT , PFE_GL_LANDSCAPE ,   PFE_GL_LINKGRAPH , PFE_DRAWING , PFE_DRAWWORLD , PFE_VIDEO ,   PFE_SOUND , PFE_ALLSCRIPTS , PFE_GAMESCRIPT , PFE_AI0 ,   PFE_AI1 , PFE_AI2 , PFE_AI3 , PFE_AI4 ,   PFE_AI5 , PFE_AI6 , PFE_AI7 , PFE_AI8 ,   PFE_AI9 , PFE_AI10 , PFE_AI11 , PFE_AI12 ,   PFE_AI13 , PFE_AI14 , PFE_MAX }
	Elements of game performance that can be measured. More...

Functions
void	ShowFramerateWindow ()
	Open the general framerate window.
void	ProcessPendingPerformanceMeasurements ()
	This drains the PFE_SOUND measurement data queue into _pf_data. More...

Detailed Description

Types for recording game performance data.

Adding new measurements

Adding a new measurement requires multiple steps, which are outlined here. The first thing to do is add a new member of the PerformanceElement enum. It must be added before PFE_MAX and should be added in a logical place. For example, an element of the game loop would be added next to the other game loop elements, and a rendering element next to the other rendering elements.

Second is adding a member to the _pf_data array, in the same position as the new PerformanceElement member.

Third is adding strings for the new element. There is an array in ConPrintFramerate with strings used for the console command. Additionally, there are two sets of strings in english.txt for two GUI uses, also in the PerformanceElement order. Search for STR_FRAMERATE_GAMELOOP and STR_FRAMETIME_CAPTION_GAMELOOP in english.txt to find those.

Last is actually adding the measurements. There are two ways to measure, either one-shot (a single function/block handling all processing), or as an accumulated element (multiple functions/blocks that need to be summed across each frame/tick). Use either the PerformanceMeasurer or the PerformanceAccumulator class respectively for the two cases. Either class is used by instantiating an object of it at the beginning of the block to be measured, so it auto-destructs at the end of the block. For PerformanceAccumulator, make sure to also call PerformanceAccumulator::Reset once at the beginning of a new frame. Usually the StateGameLoop function is appropriate for this.

See also

framerate_gui.cpp for implementation

Definition in file framerate_type.h.

Enumeration Type Documentation

PerformanceElement

enum PerformanceElement

Elements of game performance that can be measured.

Note

When adding new elements here, make sure to also update all other locations depending on the length and order of this enum. See Adding new measurements above.

Enumerator
PFE_GAMELOOP	Speed of gameloop processing.
PFE_GL_ECONOMY	Time spent processing cargo movement.
PFE_GL_TRAINS	Time spent processing trains.
PFE_GL_ROADVEHS	Time spend processing road vehicles.
PFE_GL_SHIPS	Time spent processing ships.
PFE_GL_AIRCRAFT	Time spent processing aircraft.
PFE_GL_LANDSCAPE	Time spent processing other world features.
PFE_GL_LINKGRAPH	Time spent waiting for link graph background jobs.
PFE_DRAWING	Speed of drawing world and GUI.
PFE_DRAWWORLD	Time spent drawing world viewports in GUI.
PFE_VIDEO	Speed of painting drawn video buffer.
PFE_SOUND	Speed of mixing audio samples.
PFE_ALLSCRIPTS	Sum of all GS/AI scripts.
PFE_GAMESCRIPT	Game script execution.
PFE_AI0	AI execution for player slot 1.
PFE_AI1	AI execution for player slot 2.
PFE_AI2	AI execution for player slot 3.
PFE_AI3	AI execution for player slot 4.
PFE_AI4	AI execution for player slot 5.
PFE_AI5	AI execution for player slot 6.
PFE_AI6	AI execution for player slot 7.
PFE_AI7	AI execution for player slot 8.
PFE_AI8	AI execution for player slot 9.
PFE_AI9	AI execution for player slot 10.
PFE_AI10	AI execution for player slot 11.
PFE_AI11	AI execution for player slot 12.
PFE_AI12	AI execution for player slot 13.
PFE_AI13	AI execution for player slot 14.
PFE_AI14	AI execution for player slot 15.
PFE_MAX	End of enum, must be last.

Definition at line 47 of file framerate_type.h.

Function Documentation

ProcessPendingPerformanceMeasurements()

void ProcessPendingPerformanceMeasurements

(

)

This drains the PFE_SOUND measurement data queue into _pf_data.

PFE_SOUND measurements are made by the mixer thread and so cannot be stored into _pf_data directly, because this would not be thread safe and would violate the invariants of the FPS and frame graph windows.

See also

PerformanceMeasurement::~PerformanceMeasurement()

Definition at line 1111 of file framerate_gui.cpp.

Referenced by UpdateWindows().