FInstanceCullingOcclusionQueryRenderer Class Reference

#include <InstanceCullingOcclusionQuery.h>

Public Member Functions
uint32	Render (FRDGBuilder &GraphBuilder, FGPUScene &GPUScene, FViewInfo &View)
void	RenderDebug (FRDGBuilder &GraphBuilder, FGPUScene &GPUScene, const FViewInfo &View, const FIntRect &ViewRect, FRDGTextureRef SceneColor, FRDGTextureRef SceneDepth)
void	MarkInstancesVisible (FRDGBuilder &GraphBuilder, TConstArrayView< FGPUSceneInstanceRange > Ranges)
void	EndFrame (FRDGBuilder &GraphBuilder)
bool	IsCompatibleWithView (const FViewInfo &View)

Public Attributes
TRefCountPtr< FRDGPooledBuffer >	InstanceOcclusionQueryBuffer
EPixelFormat	InstanceOcclusionQueryBufferFormat = PF_Unknown

Detailed Description

Implements accurate per-instance occlusion culling similar to FOcclusionFeedback, except using GPUScene.

Member Function Documentation

EndFrame()

void FInstanceCullingOcclusionQueryRenderer::EndFrame

(

FRDGBuilder &

GraphBuilder

)

Perform various book-keeping tasks that must run at the end of each frame Saves view ID mapping data, extracts result buffer to be available next frame, etc.

IsCompatibleWithView()

bool FInstanceCullingOcclusionQueryRenderer::IsCompatibleWithView

(

const FViewInfo &

View

)

MarkInstancesVisible()

void FInstanceCullingOcclusionQueryRenderer::MarkInstancesVisible	(	FRDGBuilder &	GraphBuilder,
		TConstArrayView< FGPUSceneInstanceRange >	Ranges
	)

Mark blocks of occlusion query buffer entries as visible in all views. Required, for example, when GPUScene instances are invalidated betwen frames, i.e. when when GPUScene instance buffer slot is re-allocated.

Render()

uint32 FInstanceCullingOcclusionQueryRenderer::Render	(	FRDGBuilder &	GraphBuilder,
		FGPUScene &	GPUScene,
		FViewInfo &	View
	)

Perform per-instance occlusion culling using HZB and software occlusion queries. Returns view-specific bit mask that should be used when interpreting query result buffer, since it contains 1 bit per view.

RenderDebug()

void FInstanceCullingOcclusionQueryRenderer::RenderDebug	(	FRDGBuilder &	GraphBuilder,
		FGPUScene &	GPUScene,
		const FViewInfo &	View,
		const FIntRect &	ViewRect,
		FRDGTextureRef	SceneColor,
		FRDGTextureRef	SceneDepth
	)

Render object bounding boxes, color-coded based on visibility

Member Data Documentation

InstanceOcclusionQueryBuffer

TRefCountPtr<FRDGPooledBuffer> FInstanceCullingOcclusionQueryRenderer::InstanceOcclusionQueryBuffer

One uint8 per instance in GPUScene, with 1 bit per view Available when when instance culling is enabled and r.InstanceCulling.OcclusionQueries=1. Contains data for previous frame. Assumes that GPUScene instance indices are consistent.

InstanceOcclusionQueryBufferFormat

EPixelFormat FInstanceCullingOcclusionQueryRenderer::InstanceOcclusionQueryBufferFormat = PF_Unknown

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

• Engine/Source/Runtime/Renderer/Private/InstanceCulling/InstanceCullingOcclusionQuery.h
• Engine/Source/Runtime/Renderer/Private/InstanceCulling/InstanceCullingOcclusionQuery.cpp