DebugUI Class Reference

Forward-declared to avoid pulling in heavy particle headers. More...

#include <DebugUI.hpp>

Classes
struct	ShotDebugPair
struct	ExternalPanel
	Build the unified debug menu window. More...

Public Member Functions
bool	init (SDL_Window *window)
	Create the ImGui context and initialise the SDL3 input backend.
void	shutdown ()
	Destroy the ImGui context and shut down the SDL3 input backend.
void	processEvent (const SDL_Event *event)
	Forward an SDL event to the ImGui input backend.
void	newFrame ()
	Begin a new ImGui frame. Call before any ImGui draw calls.
void	buildUI (const Registry &registry, int tickCount, float &mouseSensitivity, float &gamepadLookSensitivity, systems::GamepadAimAssistConfig &aimAssistCfg, bool &renderSeparateFromPhysics, bool &inputSyncedWithPhysics, bool &limitFPSToMonitor, int &ssrMode, float physicsHz, float fpsCurrent, float fpsMin, float fpsMax, float fps1pLow, float fps5pLow)
	Build the ECS inspector window contents.
void	buildParticleUI (ParticleSystem &ps, glm::vec3 eyePos, glm::vec3 forward)
	Build the Particle System debug/control window.
void	buildRenderTogglesUI (class Renderer &renderer)
	Build the Render Toggles window for live performance profiling.
void	buildSkyboxUI (class Renderer &renderer)
	Build the Skybox selector window for live HDR skybox swapping.
void	buildLightingUI (class Renderer &renderer)
	Build the Lighting Controls window for live parameter tuning.
void	buildNetworkUI (const NetworkStats &stats)
	Build the Network Stats window showing ping, bandwidth, and update rate.
void	buildNetworkSimUI ()
	Build the Network Simulator window with sliders to add fake round-trip latency and packet loss.
int	getSimulatedLatencyMs () const noexcept
	The current latency-simulator setting in milliseconds (0–200).
int	getSimulatedLossPercent () const noexcept
	The current packet-loss setting (0–50 %).
void	buildWeaponUI (const Registry &registry)
void	buildHitboxUI (const Registry &registry, HitboxRig &hitboxRig, const glm::mat4 &viewProj, float screenWidth, float screenHeight)
	Draw the Hitbox Debug window and (optionally) capsule wireframe overlay.
void	buildCollisionUI (const physics::WorldGeometry &world, const glm::mat4 &viewProj, float screenWidth, float screenHeight)
	Draw the Collision Debug window and (optionally) wireframe overlay for all world collision primitives.
void	buildWeaponSpawnerUI (const Registry &registry, const glm::mat4 &viewProj, float screenWidth, float screenHeight)
	Draw the Weapon Spawner Debug window and (optionally) wireframe overlay for all weapon spawner entities, showing their bounding boxes and spawn positions.
void	buildSpawnPointUI (const Registry &registry, const glm::mat4 &viewProj, float screenWidth, float screenHeight)
	Draw the Spawn Point Debug window and (optionally) overlay markers for all player respawn point entities, showing position and cooldown state.
void	pushClientShot (const net::shotdebug::ShotDebugCapture &cap)
	Append a fire-time snapshot the local client just took.
void	pushServerShot (const net::shotdebug::ShotDebugCapture &cap)
	Append a server-reported rewind snapshot.
void	buildShotDebugUI (const glm::mat4 &viewProj, float screenWidth, float screenHeight)
	Build the Shot Debug ImGui window + 3D overlay.
void	render ()
	Finalise the ImGui frame. Call after all ImGui draw calls, before Renderer::drawFrame().
void	toggleDebugMenu ()
	Toggle the unified debug menu on/off.
void	buildDebugMenu (std::initializer_list< ExternalPanel > externalPanels)

Public Attributes
bool	showHitboxWindow = false
	Show the Hitbox Debug ImGui window.
bool	drawHitboxOverlay = false
	Draw 3-D capsule wireframes (independent of window visibility).
bool	showCollisionWindow = false
	Show the Collision Debug ImGui window.
bool	drawCollisionOverlay = false
	Draw world collision wireframes (independent of window visibility).
bool	showWeaponSpawnerWindow = false
	Show the Weapon Spawner Debug ImGui window.
bool	drawWeaponSpawnerOverlay = false
	Draw weapon spawner wireframes (independent of window visibility).
bool	showSpawnPointWindow = false
	Show the Spawn Point Debug ImGui window.
bool	drawSpawnPointOverlay = false
	Draw spawn point markers (independent of window visibility).
std::array< ShotDebugPair, k_shotRingMax >	shotRing {}
int	shotRingHead = 0
	Next-write slot.
int	shotRingCount = 0
	Live entries; saturates at k_shotRingMax.
bool	showShotDebugWindow = false
	Show the Shot Debug panel + 3D overlay (CSGO sv_showimpacts).
bool	drawShotDebugOverlay = false
int	shotDebugVisibleCount = 5
	Slider value: how many of the most-recent shots to render (1-k_shotRingMax).
int	shotDebugSelectIdx = 0
	1-based index into the ring (1 = newest) to highlight.
int	shotDebugViewMode = 0
	Which side(s) to render in the 3D overlay.
bool	drawCollisionPlanes = true
bool	drawCollisionBoxes = true
bool	drawCollisionBrushes = true
bool	drawCollisionCylinders = true
bool	drawCollisionSpheres = true
bool	drawCollisionTriMeshes = true
bool	showDebugMenu = false
	Master toggle for the unified debug menu window.
bool	pendingAmmoRefill_ = false
	Set by Weapon HUD button, consumed by Game::iterate().

Static Public Attributes
static constexpr int	k_shotRingMax = 30

Private Member Functions
void	buildInspectorContents (const Registry &registry, int tickCount, float &mouseSensitivity, float &gamepadLookSensitivity, systems::GamepadAimAssistConfig &aimAssistCfg, bool &renderSeparateFromPhysics, bool &inputSyncedWithPhysics, bool &limitFPSToMonitor, int &ssrMode, float physicsHz, float fpsCurrent, float fpsMin, float fpsMax, float fps1pLow, float fps5pLow)
	Draw the body of the ECS Inspector window (everything after ImGui::Begin).
void	buildMovementChart (const Registry &registry)
	Draw the standalone 2-D overhead movement chart window.
void	buildBhopAnalyzer (const Registry &registry)
	Draw the bhop analyzer window.

Private Attributes
bool	showInspector = false
	Per-window visibility toggles — persistent across frames.
bool	showRenderToggles = false
	Show the Render Toggles window.
bool	showLightingControls = false
	Show the Lighting Controls window.
bool	showSkybox = false
	Show the Skybox window.
bool	showNetworkStats = false
	Show the Network Stats window.
bool	showNetworkSim = false
	Show the Network Simulator (latency + loss) window.
bool	showWeaponHud = false
	Show the Weapon HUD debug window (disabled by default).
int	simulatedLatencyMs_ = 0
	Phase 6 testing: simulated round-trip latency in ms.
int	simulatedLossPct_ = 0
	Phase 6 testing: simulated UDP packet loss in percent.
bool	showPosition = true
	Per-component visibility toggles — persistent across frames.
bool	showPrevPosition = false
	Show PreviousPosition component row.
bool	showVelocity = true
	Show Velocity component row.
bool	showCollisionShape = true
	Show CollisionShape half-extents row.
bool	showPlayerState = true
	Show PlayerState flags row.
bool	showInputSnapshot = true
	Show InputSnapshot key-state row.
bool	showViewAngles = true
	Show yaw/pitch/roll in degrees (easier to read than radians).
bool	showMovementChart = false
	Show the 2-D overhead movement chart window.
bool	showBhopAnalyzer = false
	Show the bhop analyzer (player-relative + gain/sync).
float	bhopSpeedHistory_ [k_bhopHistorySize] = {}
float	bhopGainHistory_ [k_bhopHistorySize] = {}
bool	bhopAirborneHistory_ [k_bhopHistorySize] = {}
bool	bhopGainingHistory_ [k_bhopHistorySize] = {}
int	bhopHistoryIdx_ = 0
	Next write slot in the ring buffers.
int	bhopHistoryFill_ = 0
	Samples collected so far (up to k_bhopHistorySize).
float	bhopPrevHSpeed_ = 0.0f
	Previous frame's horizontal speed (for gain calc).
bool	bhopHasPrevSample_ = false
float	particleSpawnDist_ = 200.f
	Units ahead of camera to spawn effects.
bool	showParticleWindow_ = false

Static Private Attributes
static constexpr int	k_bhopHistorySize = 256

Detailed Description

Forward-declared to avoid pulling in heavy particle headers.

Live ECS inspector overlay powered by Dear ImGui.

Ownership split:

• DebugUI — ImGui context, imgui_impl_sdl3 input backend, UI state
• Renderer — imgui_impl_sdlgpu3 render backend (owns the GPU device)

Initialisation order in Game::init():

1. debugUI.init(window) — context must exist before GPU backend init
2. renderer.init(window) — GPU backend init happens here

Shutdown order in Game::quit():

1. renderer.quit() — GPU backend shutdown first
2. debugUI.shutdown() — context destroyed last

Member Function Documentation

buildBhopAnalyzer()

void DebugUI::buildBhopAnalyzer ( const Registry & registry )

private

Draw the bhop analyzer window.

Shows velocity/wish vectors rotated into player-local space (player forward always points screen-up), plus numeric breakdowns, gain-per-frame, sync %, and history plots for horizontal speed and gain.

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buildCollisionUI()

void DebugUI::buildCollisionUI	(	const physics::WorldGeometry &	world,
		const glm::mat4 &	viewProj,
		float	screenWidth,
		float	screenHeight )

Draw the Collision Debug window and (optionally) wireframe overlay for all world collision primitives.

Parameters

world	The world geometry to visualise.
viewProj	Combined view-projection matrix for the current camera.
screenWidth	Viewport width in pixels.
screenHeight	Viewport height in pixels.

buildDebugMenu()

void DebugUI::buildDebugMenu

(

std::initializer_list< ExternalPanel >

externalPanels

)

buildHitboxUI()

void DebugUI::buildHitboxUI	(	const Registry &	registry,
		HitboxRig &	hitboxRig,
		const glm::mat4 &	viewProj,
		float	screenWidth,
		float	screenHeight )

Draw the Hitbox Debug window and (optionally) capsule wireframe overlay.

The window is always rendered when showHitboxWindow is true. The 3-D capsule overlay is drawn only when the "Draw Hitboxes" checkbox inside the window is checked.

Parameters

registry	ECS registry (reads HitboxInstance, Position, Player).
viewProj	Combined view-projection matrix for the current camera.
screenWidth	Viewport width in pixels.
screenHeight	Viewport height in pixels.

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buildInspectorContents()

void DebugUI::buildInspectorContents ( const Registry & registry, int tickCount, float & mouseSensitivity, float & gamepadLookSensitivity, systems::GamepadAimAssistConfig & aimAssistCfg, bool & renderSeparateFromPhysics, bool & inputSyncedWithPhysics, bool & limitFPSToMonitor, int & ssrMode, float physicsHz, float fpsCurrent, float fpsMin, float fpsMax, float fps1pLow, float fps5pLow )

private

Draw the body of the ECS Inspector window (everything after ImGui::Begin).

Factored out of buildUI so the Begin/End wrapping (and early-out when the window is hidden) lives in one place in buildUI, while the content logic lives here. Parameter list mirrors buildUI.

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buildLightingUI()

void DebugUI::buildLightingUI

(

class Renderer &

renderer

)

Build the Lighting Controls window for live parameter tuning.

buildMovementChart()

void DebugUI::buildMovementChart ( const Registry & registry )

private

Draw the standalone 2-D overhead movement chart window.

Shows the local player dot on a 3 000 × 3 000 unit grid together with view-direction, velocity, and wish-velocity arrows.

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buildNetworkSimUI()

void DebugUI::buildNetworkSimUI

(

)

Build the Network Simulator window with sliders to add fake round-trip latency and packet loss.

Useful for testing Phase 6 lag compensation and Phase 5b reconciliation under non-LAN conditions without setting up tc qdisc.

Latency slider value (0–200 ms) is written into simulatedLatencyMs_ and read by Game::iterate which forwards it to Client::setSimulatedLatencyMs. Half the value is added to outbound packets and half to inbound, modelling a symmetric network with the slider's RTT.

Packet-loss slider value (0–50 %) is written into simulatedLossPct_, forwarded to Client::setSimulatedLossPercent, and applied as an independent Bernoulli drop in each direction.

buildNetworkUI()

void DebugUI::buildNetworkUI

(

const NetworkStats &

stats

)

Build the Network Stats window showing ping, bandwidth, and update rate.

buildParticleUI()

void DebugUI::buildParticleUI	(	ParticleSystem &	ps,
		glm::vec3	eyePos,
		glm::vec3	forward )

Build the Particle System debug/control window.

Parameters

ps	The particle system to inspect and control.
eyePos	Camera eye position (used to compute spawn position).
forward	Camera forward unit vector.

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buildRenderTogglesUI()

void DebugUI::buildRenderTogglesUI

(

class Renderer &

renderer

)

Build the Render Toggles window for live performance profiling.

Parameters

renderer

The renderer (for toggles, AA mode).

buildShotDebugUI()

void DebugUI::buildShotDebugUI	(	const glm::mat4 &	viewProj,
		float	screenWidth,
		float	screenHeight )

Build the Shot Debug ImGui window + 3D overlay.

Parameters

viewProj	Camera VP for the world→screen projection.
screenWidth	Viewport width in pixels.
screenHeight	Viewport height in pixels.

buildSkyboxUI()

void DebugUI::buildSkyboxUI

(

class Renderer &

renderer

)

Build the Skybox selector window for live HDR skybox swapping.

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buildSpawnPointUI()

void DebugUI::buildSpawnPointUI	(	const Registry &	registry,
		const glm::mat4 &	viewProj,
		float	screenWidth,
		float	screenHeight )

Draw the Spawn Point Debug window and (optionally) overlay markers for all player respawn point entities, showing position and cooldown state.

Parameters

registry	ECS registry (reads RespawnPoint, Position).
viewProj	Combined view-projection matrix for the current camera.
screenWidth	Viewport width in pixels.
screenHeight	Viewport height in pixels.

buildUI()

void DebugUI::buildUI	(	const Registry &	registry,
		int	tickCount,
		float &	mouseSensitivity,
		float &	gamepadLookSensitivity,
		systems::GamepadAimAssistConfig &	aimAssistCfg,
		bool &	renderSeparateFromPhysics,
		bool &	inputSyncedWithPhysics,
		bool &	limitFPSToMonitor,
		int &	ssrMode,
		float	physicsHz,
		float	fpsCurrent,
		float	fpsMin,
		float	fpsMax,
		float	fps1pLow,
		float	fps5pLow )

Build the ECS inspector window contents.

Parameters

registry	The ECS registry to inspect.
tickCount	Total physics ticks elapsed.
mouseSensitivity	Radians per pixel; slider (read/write).
gamepadLookSensitivity	Radians per second at full right-stick deflection; slider (read/write).
aimAssistCfg	Gamepad aim-assist config; sliders + toggle (read/write).
renderSeparateFromPhysics	Interpolated unlimited-fps mode toggle (read/write).
inputSyncedWithPhysics	Sample input once per tick vs every frame (read/write).
limitFPSToMonitor	VSync on/off toggle (read/write).
physicsHz	Measured physics tick rate (Hz).
fpsCurrent	Most-recent render FPS sample.
fpsMin	Minimum FPS in the rolling window.
fpsMax	Maximum FPS in the rolling window.
fps1pLow	1st-percentile FPS (1 % low).
fps5pLow	5th-percentile FPS (5 % low).

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buildWeaponSpawnerUI()

void DebugUI::buildWeaponSpawnerUI	(	const Registry &	registry,
		const glm::mat4 &	viewProj,
		float	screenWidth,
		float	screenHeight )

Draw the Weapon Spawner Debug window and (optionally) wireframe overlay for all weapon spawner entities, showing their bounding boxes and spawn positions.

Parameters

registry	ECS registry (reads WeaponSpawner, Position, CollisionShape).
viewProj	Combined view-projection matrix for the current camera.
screenWidth	Viewport width in pixels.
screenHeight	Viewport height in pixels.

buildWeaponUI()

void DebugUI::buildWeaponUI

(

const Registry &

registry

)

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getSimulatedLatencyMs()

int DebugUI::getSimulatedLatencyMs ( ) const

inlinenodiscardnoexcept

The current latency-simulator setting in milliseconds (0–200).

Read by Game::iterate each frame to push to Client::setSimulatedLatencyMs.

getSimulatedLossPercent()

int DebugUI::getSimulatedLossPercent ( ) const

inlinenodiscardnoexcept

The current packet-loss setting (0–50 %).

Read by Game::iterate each frame to push to Client::setSimulatedLossPercent.

init()

bool DebugUI::init

(

SDL_Window *

window

)

Create the ImGui context and initialise the SDL3 input backend.

Parameters

window

The SDL window receiving input events.

Returns

False if ImGui backend initialisation fails.

newFrame()

void DebugUI::newFrame

(

)

Begin a new ImGui frame. Call before any ImGui draw calls.

processEvent()

void DebugUI::processEvent

(

const SDL_Event *

event

)

Forward an SDL event to the ImGui input backend.

Parameters

event

The event to process.

pushClientShot()

void DebugUI::pushClientShot

(

const net::shotdebug::ShotDebugCapture &

cap

)

Append a fire-time snapshot the local client just took.

Pairs with any matching server view (by shotInputTick).

pushServerShot()

void DebugUI::pushServerShot

(

const net::shotdebug::ShotDebugCapture &

cap

)

Append a server-reported rewind snapshot.

Pairs with any matching client view (by shotInputTick).

render()

void DebugUI::render

(

)

Finalise the ImGui frame. Call after all ImGui draw calls, before Renderer::drawFrame().

shutdown()

void DebugUI::shutdown

(

)

Destroy the ImGui context and shut down the SDL3 input backend.

toggleDebugMenu()

void DebugUI::toggleDebugMenu

(

)

Toggle the unified debug menu on/off.

When visible, the debug menu shows one checkbox per debug panel. Individual panels are only drawn when their checkbox is checked.

Member Data Documentation

bhopAirborneHistory_

bool DebugUI::bhopAirborneHistory_[k_bhopHistorySize] = {}

private

bhopGainHistory_

float DebugUI::bhopGainHistory_[k_bhopHistorySize] = {}

private

bhopGainingHistory_

bool DebugUI::bhopGainingHistory_[k_bhopHistorySize] = {}

private

bhopHasPrevSample_

bool DebugUI::bhopHasPrevSample_ = false

private

bhopHistoryFill_

int DebugUI::bhopHistoryFill_ = 0

private

Samples collected so far (up to k_bhopHistorySize).

bhopHistoryIdx_

int DebugUI::bhopHistoryIdx_ = 0

private

Next write slot in the ring buffers.

bhopPrevHSpeed_

float DebugUI::bhopPrevHSpeed_ = 0.0f

private

Previous frame's horizontal speed (for gain calc).

bhopSpeedHistory_

float DebugUI::bhopSpeedHistory_[k_bhopHistorySize] = {}

private

drawCollisionBoxes

bool DebugUI::drawCollisionBoxes = true

drawCollisionBrushes

bool DebugUI::drawCollisionBrushes = true

drawCollisionCylinders

bool DebugUI::drawCollisionCylinders = true

drawCollisionOverlay

bool DebugUI::drawCollisionOverlay = false

Draw world collision wireframes (independent of window visibility).

drawCollisionPlanes

bool DebugUI::drawCollisionPlanes = true

drawCollisionSpheres

bool DebugUI::drawCollisionSpheres = true

drawCollisionTriMeshes

bool DebugUI::drawCollisionTriMeshes = true

drawHitboxOverlay

bool DebugUI::drawHitboxOverlay = false

Draw 3-D capsule wireframes (independent of window visibility).

drawShotDebugOverlay

bool DebugUI::drawShotDebugOverlay = false

drawSpawnPointOverlay

bool DebugUI::drawSpawnPointOverlay = false

Draw spawn point markers (independent of window visibility).

drawWeaponSpawnerOverlay

bool DebugUI::drawWeaponSpawnerOverlay = false

Draw weapon spawner wireframes (independent of window visibility).

k_bhopHistorySize

int DebugUI::k_bhopHistorySize = 256

staticconstexprprivate

k_shotRingMax

int DebugUI::k_shotRingMax = 30

staticconstexpr

particleSpawnDist_

float DebugUI::particleSpawnDist_ = 200.f

private

Units ahead of camera to spawn effects.

pendingAmmoRefill_

bool DebugUI::pendingAmmoRefill_ = false

Set by Weapon HUD button, consumed by Game::iterate().

shotDebugSelectIdx

int DebugUI::shotDebugSelectIdx = 0

1-based index into the ring (1 = newest) to highlight.

0 means "show all in the visible window".

shotDebugViewMode

int DebugUI::shotDebugViewMode = 0

Which side(s) to render in the 3D overlay.

Maps to a dropdown in the UI panel: 0=Both, 1=Client only, 2=Server only. The underlying data is always captured for both sides; this only filters the render.

shotDebugVisibleCount

int DebugUI::shotDebugVisibleCount = 5

Slider value: how many of the most-recent shots to render (1-k_shotRingMax).

All older shots stay in the ring but are hidden from the overlay.

shotRing

std::array<ShotDebugPair, k_shotRingMax> DebugUI::shotRing {}

shotRingCount

int DebugUI::shotRingCount = 0

Live entries; saturates at k_shotRingMax.

shotRingHead

int DebugUI::shotRingHead = 0

Next-write slot.

showBhopAnalyzer

bool DebugUI::showBhopAnalyzer = false

private

Show the bhop analyzer (player-relative + gain/sync).

showCollisionShape

bool DebugUI::showCollisionShape = true

private

Show CollisionShape half-extents row.

showCollisionWindow

bool DebugUI::showCollisionWindow = false

Show the Collision Debug ImGui window.

showDebugMenu

bool DebugUI::showDebugMenu = false

Master toggle for the unified debug menu window.

showHitboxWindow

bool DebugUI::showHitboxWindow = false

Show the Hitbox Debug ImGui window.

showInputSnapshot

bool DebugUI::showInputSnapshot = true

private

Show InputSnapshot key-state row.

showInspector

bool DebugUI::showInspector = false

private

Per-window visibility toggles — persistent across frames.

Show the main ECS Inspector window.

showLightingControls

bool DebugUI::showLightingControls = false

private

Show the Lighting Controls window.

showMovementChart

bool DebugUI::showMovementChart = false

private

Show the 2-D overhead movement chart window.

showNetworkSim

bool DebugUI::showNetworkSim = false

private

Show the Network Simulator (latency + loss) window.

showNetworkStats

bool DebugUI::showNetworkStats = false

private

Show the Network Stats window.

showParticleWindow_

bool DebugUI::showParticleWindow_ = false

private

showPlayerState

bool DebugUI::showPlayerState = true

private

Show PlayerState flags row.

showPosition

bool DebugUI::showPosition = true

private

Per-component visibility toggles — persistent across frames.

Show Position component row.

showPrevPosition

bool DebugUI::showPrevPosition = false

private

Show PreviousPosition component row.

showRenderToggles

bool DebugUI::showRenderToggles = false

private

Show the Render Toggles window.

showShotDebugWindow

bool DebugUI::showShotDebugWindow = false

Show the Shot Debug panel + 3D overlay (CSGO sv_showimpacts).

showSkybox

bool DebugUI::showSkybox = false

private

Show the Skybox window.

showSpawnPointWindow

bool DebugUI::showSpawnPointWindow = false

Show the Spawn Point Debug ImGui window.

showVelocity

bool DebugUI::showVelocity = true

private

Show Velocity component row.

showViewAngles

bool DebugUI::showViewAngles = true

private

Show yaw/pitch/roll in degrees (easier to read than radians).

showWeaponHud

bool DebugUI::showWeaponHud = false

private

Show the Weapon HUD debug window (disabled by default).

showWeaponSpawnerWindow

bool DebugUI::showWeaponSpawnerWindow = false

Show the Weapon Spawner Debug ImGui window.

simulatedLatencyMs_

int DebugUI::simulatedLatencyMs_ = 0

private

Phase 6 testing: simulated round-trip latency in ms.

Written by the Network Simulator window's slider, read by Game::iterate to push to Client. Zero = simulator off.

simulatedLossPct_

int DebugUI::simulatedLossPct_ = 0

private

Phase 6 testing: simulated UDP packet loss in percent.

Applied independently to each direction. Zero = simulator off.

---

The documentation for this class was generated from the following files:

• src/client/debug/DebugUI.hpp
• src/client/debug/DebugUI.cpp