CRM64Pro::SceneLayerContext

Layer Context structure. More...

Detailed Description

Layer Context structure.

Contains all the state and data required for a layer to update or render. This structure is passed to the virtual update/render methods of SceneLayer and also to the user callbacks. It acts as both the input context (Time, Viewport, ID) and the output result container (Visible count, ranges).

Public Member Functions
SDL_FPoint	worldToScreen (float wx, float wy, bool bQuantize=true) const
	Convert world coordinates to screen coordinates using the canonical render camera.

Public Attributes
Sint32	iLayerID
	The ID of the layer.
eSceneLayerType	eType
	TILE, OBJECT, or IMAGE.
SDL_Rect	rViewport
	The effective viewport used for this frame.
float	fScrollX
	Current Logic/Render X scroll position.
float	fScrollY
	Current Logic/Render Y scroll position.
float	fInterpolation
	Render interpolation factor [0..1]. 1.0 during update or when smoothing is disabled.
float	fDeltaTime
	Time elapsed since last frame (for update). 0 during render.
Sint32	idRes
	Render target ID (for render). 0 during update.
Sint32	iAlpha
	Layer alpha modulation (0-255).
Sint32	iQuantizeMode
	Final screen-space quantization policy. 0=None, 1=Floor.
float	fCameraRenderX
	Camera X used for rendering this frame.
float	fCameraRenderY
	Camera Y used for rendering this frame.

Member Function Documentation

worldToScreen()

SDL_FPoint CRM64Pro::SceneLayerContext::worldToScreen ( float wx, float wy, bool bQuantize = true ) const

inline

Convert world coordinates to screen coordinates using the canonical render camera.

Parameters

wx	World X coordinate.
wy	World Y coordinate.
bQuantize	If true, applies final screen-space quantization policy from iQuantizeMode.

Returns

Screen-space point in current viewport coordinates.