From 15740faf9fe9fe4be08965098bbf2947e096aeeb Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 14 Aug 2019 22:50:43 +0800
Subject: +Unity Runtime code

---
 Runtime/Camera/LODGroup.cpp | 395 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 395 insertions(+)
 create mode 100644 Runtime/Camera/LODGroup.cpp

(limited to 'Runtime/Camera/LODGroup.cpp')

diff --git a/Runtime/Camera/LODGroup.cpp b/Runtime/Camera/LODGroup.cpp
new file mode 100644
index 0000000..c95b8e5
--- /dev/null
+++ b/Runtime/Camera/LODGroup.cpp
@@ -0,0 +1,395 @@
+#include "UnityPrefix.h"
+#include "LODGroup.h"
+#include "LODGroupManager.h"
+#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
+#include "Runtime/Filters/AABBUtility.h"
+#include "UnityScene.h"
+
+/*
+// @TODO:
+
+Ask aras:
+ RenderQueue.cpp
+ Create( "LIGHTMAP_OFF" );
+ Create( "LIGHTMAP_ON" );
+HUH???
+ 
+PRI 1
+ * Integrate with lightmaps? Probably need an option to reuse lightmap data if the uv's match up exactly between LOD's. Maybe we can automate it?
+ * multi_compile doesn't work. Seems like using more properties in a multicompile causes some shaders to drop.
+ 
+ ///@TODO: This should probably be 0. But for now we don't have proper ifdef support for switching to a different subshader.
+ #define LOD_FADE_DISABLED 0.999F
+
+ /////****** SHADER LOD FADING  **** 
+ ///@TODO: Make it so that fading is automatically disabled based on a shader tag or some shit like that.
+ ///@TODO: Expose the fade distance and visualize in inspector
+ ///@TODO: Add easy support for LOD fade in surface shaders
+ ///@TODO: Switch to a shader when it is not fading to reduce shader complexity
+ 
+PRI 2
+ ///@TODO: IntegrationTest: create lodgroup, attach renderer, delete lod group. Enable / disable renderer
+ ///@TODO: IntegrationTest: Make sure that m_LODs is never bigger than 8 (because of the lodIndex bitmask)
+ 
+ ///@TODO: GraphicsFunctionalTest / FunctionalTest: Write graphics functional test for LOD & layer based culling and projector especially when an object is being culled by the camera (Make sure it is also culled by projector)
+ 
+ 
+ ///@TODO: Does SceneManager really have to be recreated on every level load?
+ //      This is probably related to the super weird behaviour of PlayerLoadLevel deactivate / activate ...
+ 
+ 
+ 
+PRI 3
+ *  When calculating static objects pvs data. We could precalculate which static objects can be visible.
+    Have to be careful with runtime tweakable distance fudge...
+
+///@TODO: Use case: 
+// "I assume a higher LOD can be triggered, for example, for an explosion effect,
+// swapping out the unbroken model for a broken one and passing the pieces to the physics engine with random velocities.."
+
+ 
+*/
+ 
+LODGroup::LODGroup (MemLabelId label, ObjectCreationMode mode)
+	:	Super(label, mode)
+	,   m_LODGroup (-1)
+{
+	m_Enabled = true;
+}
+
+LODGroup::~LODGroup ()
+{
+	Assert(m_LODGroup == kInvalidLODGroup);
+	Assert(m_CachedRenderers.empty());
+}
+
+void LODGroup::Reset ()
+{
+	Super::Reset();
+	m_LocalReferencePoint = Vector3f(0, 0, 0);
+	m_Size = 1.0F;
+	m_ScreenRelativeTransitionHeight = 0.0;
+	m_LODs.clear();
+}
+
+void LODGroup::SmartReset ()
+{
+	Super::SmartReset();
+	
+	LODGroup::LOD lod;
+	lod.screenRelativeHeight = 0.6f;
+	m_LODs.push_back( lod );
+	lod.screenRelativeHeight = 0.3f;
+	m_LODs.push_back( lod );
+	lod.screenRelativeHeight = 0.1f;
+	m_LODs.push_back( lod );
+}
+
+void LODGroup::CheckConsistency ()
+{
+	Super::CheckConsistency();
+	m_LODs.resize(std::min<size_t>(m_LODs.size(), kMaximumLODLevels));
+}
+
+void LODGroup::AwakeFromLoad (AwakeFromLoadMode mode)
+{
+	Super::AwakeFromLoad (mode);
+	UpdateEnabledState(IsActive());
+	SyncLODGroupManager();
+}
+
+void LODGroup::Deactivate (DeactivateOperation operation)
+{
+	UpdateEnabledState(false);
+	Super::Deactivate (operation);
+}
+
+void LODGroup::SetLocalReferencePoint (const Vector3f& ref)
+{
+	m_LocalReferencePoint = ref;
+	SyncLODGroupManager();
+	SetDirty();
+}
+
+void LODGroup::SetSize (float size)
+{
+	m_Size = size;
+	SyncLODGroupManager();
+	SetDirty();
+}
+
+void LODGroup::SyncLODGroupManager ()
+{
+	// Super inefficient...
+	if (m_LODGroup != kInvalidLODGroup)
+	{
+		Cleanup ();
+		Create ();
+	}
+}
+
+void LODGroup::NotifyLODGroupManagerIndexChange (int newIndex)
+{
+	m_LODGroup = newIndex;
+	for (int i=0;i<m_CachedRenderers.size();i++)
+	{
+		SceneHandle handle = m_CachedRenderers[i]->GetSceneHandle();
+		if (handle != kInvalidSceneHandle)
+			GetScene().SetRendererLODGroup(handle, newIndex);
+	}
+}
+
+bool DoesRendererSupportLODFade (Renderer& renderer)
+{
+	//@TODO:
+//	MaterialArray& materials = renderer.GetMaterialArray();
+	return false;
+}
+
+// Goes through Renderers in the LODArray and sets up their LODGroup pointers & group indices and masks
+
+void LODGroup::RegisterCachedRenderers ()
+{
+	Assert(m_CachedRenderers.empty());
+	Assert(m_LODGroup != kInvalidLODGroup);
+	
+	bool supportsLODFade = false;
+	
+	Unity::Scene& scene = GetScene();
+
+	for (int i=0;i<m_LODs.size();i++)
+	{
+		LODRenderers& renderers = m_LODs[i].renderers;
+		
+		for (int r=0;r<renderers.size();r++)
+		{
+			Renderer* renderer = renderers[r].renderer;
+			if (renderer == NULL)
+				continue;
+			
+			supportsLODFade |= DoesRendererSupportLODFade (*renderer);
+			
+			SceneHandle handle = renderer->GetSceneHandle();
+
+			// If the renderer has no LODGroup attached yet, then this is the first time that specific Renderer is used in this LODGroup.
+			// Thus we initialize the Group index & LODIndexMask with the current LOD Level
+			if (renderer->GetLODGroup () == NULL)
+			{
+				renderer->SetLODGroup (this);
+
+				// Initialize cull node lodgroup values
+				if (handle != kInvalidSceneHandle)
+				{
+					scene.SetRendererLODGroup(handle, m_LODGroup);
+					scene.SetRendererLODIndexMask(handle, 1 << i);
+				}
+				m_CachedRenderers.push_back(renderer);
+			}
+			// The renderer is attached to the same LOD group in a previous LOD level.
+			// Thus we add the current LOD level to the LODIndexMask
+			else if (renderer->GetLODGroup () == this)
+			{
+				if (handle != kInvalidSceneHandle)
+				{
+					UInt32 lodIndexMask = GetScene().GetRendererNode(handle).lodIndexMask;
+					lodIndexMask |= 1 << i;
+					scene.SetRendererLODIndexMask(handle, lodIndexMask);
+				}
+			}
+			// Fail (renderer is used in multiple LODGroups...)
+			else
+			{
+				string warningString = Format("Renderer '%s' is registered with more than one LODGroup ('%s' and '%s').", renderer->GetName(), GetName(), renderer->GetLODGroup ()->GetName());
+				WarningStringObject(warningString, renderer);
+			}
+		}
+	}
+}
+
+void LODGroup::ClearCachedRenderers ()
+{
+	for (int i=0;i<m_CachedRenderers.size();i++)
+	{
+		m_CachedRenderers[i]->SetLODGroup (NULL);
+		SceneHandle handle = m_CachedRenderers[i]->GetSceneHandle();
+		if (handle != kInvalidSceneHandle)
+		{
+			Unity::Scene& scene = GetScene();
+			scene.SetRendererLODGroup(handle, 0);
+			scene.SetRendererLODIndexMask(handle, 0);
+		}
+	}
+	m_CachedRenderers.resize_uninitialized(0);
+}
+
+void LODGroup::RemoveFromCachedRenderers (Renderer* renderer)
+{
+	for (int i=0;i<m_CachedRenderers.size();i++)
+	{
+		if (m_CachedRenderers[i] == renderer)
+		{
+			m_CachedRenderers[i] = m_CachedRenderers.back();
+			m_CachedRenderers.pop_back();
+			return;
+		}
+	}
+}
+
+void LODGroup::GetLODGroupIndexAndMask (Renderer* renderer, UInt32* outGroup, UInt32* outMask)
+{
+	Assert(m_LODGroup != kInvalidLODGroup);
+	
+	PPtr<Renderer> rendererPPtr (renderer);
+	
+	// Compute mask of which LOD 
+	UInt32 mask = 0;
+	for (int i=0;i<m_LODs.size();i++)
+	{
+		LODRenderers& renderers = m_LODs[i].renderers;
+		for (int r=0;r<renderers.size();r++)
+		{
+			if (renderers[r].renderer == rendererPPtr)
+				mask |= 1 << i;
+		}
+	}
+	
+	*outMask = mask;
+	*outGroup = m_LODGroup;
+}
+
+void LODGroup::SetLODArray (const LODArray& lodArray)
+{
+	m_LODs = lodArray;
+	SyncLODGroupManager();
+	SetDirty();
+}
+
+const LODGroup::LOD& LODGroup::GetLOD (int index)
+{
+	Assert (index < GetLODCount());
+	return m_LODs[index];
+}
+
+
+Vector3f LODGroup::GetWorldReferencePoint ()
+{
+	return GetComponent(Transform).TransformPoint(m_LocalReferencePoint);
+}
+
+float LODGroup::GetWorldSpaceScale ()
+{
+	Vector3f scale = GetComponent(Transform).GetWorldScaleLossy();
+	float largestAxis;
+	largestAxis = Abs(scale.x);
+	largestAxis = std::max (largestAxis, Abs(scale.y));
+	largestAxis = std::max (largestAxis, Abs(scale.z));
+	return largestAxis;
+}
+
+float LODGroup::GetWorldSpaceSize ()
+{
+	return GetWorldSpaceScale () * m_Size;
+}
+
+void LODGroup::UpdateEnabledState (bool active)
+{
+	Cleanup();
+	if (active)
+		Create();
+}
+
+void LODGroup::Create()
+{
+	if (m_Enabled)
+	{
+		GetLODGroupManager().AddLODGroup(*this, GetWorldReferencePoint(), GetWorldSpaceSize());
+	}
+	else
+	{
+		m_LODGroup = kDisabledLODGroup;
+	}
+	
+	RegisterCachedRenderers();	
+}
+
+
+bool LODGroup::GetEnabled() 
+{
+	return m_Enabled;
+}
+
+void LODGroup::SetEnabled(bool enabled) 
+{
+	if ((bool)m_Enabled == enabled)
+		return;
+	m_Enabled = enabled;
+	UpdateEnabledState (IsActive ());
+	SetDirty ();
+}
+
+void LODGroup::Cleanup ()
+{
+	if (m_LODGroup != kInvalidLODGroup)
+	{
+		ClearCachedRenderers();
+		if (m_LODGroup == kDisabledLODGroup)
+			m_LODGroup = kInvalidLODGroup;
+		else
+			GetLODGroupManager().RemoveLODGroup(*this);
+	}
+}
+
+void LODGroup::OnTransformChanged (int options) 
+{
+	if (m_LODGroup != kInvalidLODGroup)
+	{
+		// Scale changed: update all parameters
+		if (options & Transform::kScaleChanged)
+			GetLODGroupManager().UpdateLODGroupParameters(m_LODGroup, *this, GetWorldReferencePoint(), GetWorldSpaceSize());	
+		// rotation or position changed: fastpath for just changing the reference point
+		else
+		{
+			GetLODGroupManager().UpdateLODGroupPosition(m_LODGroup, GetWorldReferencePoint());	
+		}
+	}
+}
+
+template<class TransferFunction> inline
+void LODGroup::Transfer (TransferFunction& transfer) 
+{
+	Super::Transfer (transfer);
+	TRANSFER (m_LocalReferencePoint);
+	TRANSFER (m_Size);
+	TRANSFER (m_ScreenRelativeTransitionHeight);
+	TRANSFER (m_LODs);
+	transfer.Transfer (m_Enabled, "m_Enabled", kHideInEditorMask);
+}
+
+template<class TransferFunction> inline
+void LODGroup::LODRenderer::Transfer (TransferFunction& transfer) 
+{
+	TRANSFER (renderer);
+}
+
+template<class TransferFunction> inline
+void LODGroup::LOD::Transfer (TransferFunction& transfer) 
+{
+	TRANSFER (screenRelativeHeight);
+	TRANSFER (renderers);
+}
+
+void LODGroup::InitializeClass ()
+{
+	REGISTER_MESSAGE (LODGroup, kTransformChanged, OnTransformChanged, int);
+
+	InitializeLODGroupManager();
+}
+
+void LODGroup::CleanupClass ()
+{
+	if (GetLODGroupManagerPtr())
+		CleanupLODGroupManager();
+}
+
+IMPLEMENT_CLASS_HAS_INIT(LODGroup)
+IMPLEMENT_OBJECT_SERIALIZE(LODGroup)
-- 
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