uint32 FRendererModule::GetNumDynamicLightsAffectingPrimitive(const FPrimitiveSceneInfo* PrimitiveSceneInfo,const FLightCacheInterface* LCI)
{
uint32 NumDynamicLights = 0;
FLightPrimitiveInteraction *LightList = PrimitiveSceneInfo->LightList;
while ( LightList )
{
const FLightSceneInfo* LightSceneInfo = LightList->GetLight();
// Determine the interaction type between the mesh and the light.
FLightInteraction LightInteraction = FLightInteraction::Dynamic();
if(LCI)
{
LightInteraction = LCI->GetInteraction(LightSceneInfo->Proxy);
}
// Don't count light-mapped or irrelevant lights.
if(LightInteraction.GetType() != LIT_CachedIrrelevant && LightInteraction.GetType() != LIT_CachedLightMap)
{
++NumDynamicLights;
}
LightList = LightList->GetNextLight();
}
return NumDynamicLights;
}
const FProjectedShadowInfo* FDeferredShadingSceneRenderer::PrepareTranslucentShadowMap(FRHICommandList& RHICmdList, const FViewInfo& View, FPrimitiveSceneInfo* PrimitiveSceneInfo, bool bSeparateTranslucencyPass)
{
const FVisibleLightInfo* VisibleLightInfo = NULL;
FProjectedShadowInfo* TranslucentSelfShadow = NULL;
// Find this primitive's self shadow if there is one
if (PrimitiveSceneInfo->Proxy && PrimitiveSceneInfo->Proxy->CastsVolumetricTranslucentShadow())
{
for (FLightPrimitiveInteraction* Interaction = PrimitiveSceneInfo->LightList;
Interaction && !TranslucentSelfShadow;
Interaction = Interaction->GetNextLight()
)
{
const FLightSceneInfo* LightSceneInfo = Interaction->GetLight();
if (LightSceneInfo->Proxy->GetLightType() == LightType_Directional
// Only reuse cached shadows from the light which last used TranslucentSelfShadowLayout
// This has the side effect of only allowing per-pixel self shadowing from one light
&& LightSceneInfo->Id == CachedTranslucentSelfShadowLightId)
{
VisibleLightInfo = &VisibleLightInfos[LightSceneInfo->Id];
FProjectedShadowInfo* ObjectShadow = NULL;
for (int32 ShadowIndex = 0; ShadowIndex < VisibleLightInfo->AllProjectedShadows.Num(); ShadowIndex++)
{
FProjectedShadowInfo* CurrentShadowInfo = VisibleLightInfo->AllProjectedShadows[ShadowIndex];
if (CurrentShadowInfo && CurrentShadowInfo->bTranslucentShadow && CurrentShadowInfo->ParentSceneInfo == PrimitiveSceneInfo)
{
TranslucentSelfShadow = CurrentShadowInfo;
break;
}
}
}
}
// Allocate and render the shadow's depth map if needed
if (TranslucentSelfShadow && !TranslucentSelfShadow->bAllocatedInTranslucentLayout)
{
check(IsInRenderingThread());
bool bPossibleToAllocate = true;
// Attempt to find space in the layout
TranslucentSelfShadow->bAllocatedInTranslucentLayout = TranslucentSelfShadowLayout.AddElement(
TranslucentSelfShadow->X,
TranslucentSelfShadow->Y,
TranslucentSelfShadow->ResolutionX + SHADOW_BORDER * 2,
TranslucentSelfShadow->ResolutionY + SHADOW_BORDER * 2);
// Free shadowmaps from this light until allocation succeeds
while (!TranslucentSelfShadow->bAllocatedInTranslucentLayout && bPossibleToAllocate)
{
bPossibleToAllocate = false;
for (int32 ShadowIndex = 0; ShadowIndex < VisibleLightInfo->AllProjectedShadows.Num(); ShadowIndex++)
{
FProjectedShadowInfo* CurrentShadowInfo = VisibleLightInfo->AllProjectedShadows[ShadowIndex];
if (CurrentShadowInfo->bTranslucentShadow && CurrentShadowInfo->bAllocatedInTranslucentLayout)
{
verify(TranslucentSelfShadowLayout.RemoveElement(
CurrentShadowInfo->X,
CurrentShadowInfo->Y,
CurrentShadowInfo->ResolutionX + SHADOW_BORDER * 2,
CurrentShadowInfo->ResolutionY + SHADOW_BORDER * 2));
CurrentShadowInfo->bAllocatedInTranslucentLayout = false;
bPossibleToAllocate = true;
break;
}
}
TranslucentSelfShadow->bAllocatedInTranslucentLayout = TranslucentSelfShadowLayout.AddElement(
TranslucentSelfShadow->X,
TranslucentSelfShadow->Y,
TranslucentSelfShadow->ResolutionX + SHADOW_BORDER * 2,
TranslucentSelfShadow->ResolutionY + SHADOW_BORDER * 2);
}
if (!bPossibleToAllocate)
{
// Failed to allocate space for the shadow depth map, so don't use the self shadow
TranslucentSelfShadow = NULL;
}
else
{
check(TranslucentSelfShadow->bAllocatedInTranslucentLayout);
// Render the translucency shadow map
TranslucentSelfShadow->RenderTranslucencyDepths(RHICmdList, this);
// Restore state
SetTranslucentRenderTargetAndState(RHICmdList, View, bSeparateTranslucencyPass);
}
}
}
return TranslucentSelfShadow;
}
