From bf90df100e120e272c14c7975a22ed01bf3ad215 Mon Sep 17 00:00:00 2001
From: Lizzy Fleckenstein <eliasfleckenstein@web.de>
Date: Thu, 13 Apr 2023 08:40:18 +0200
Subject: Add back lighting system

Code is taken from latest irrlicht trunk; this is relevant because there have been fixes to stencil shadows since 1.8.5 (irrlicht SVN revision 5933).
---
 source/Irrlicht/CMeshSceneNode.cpp | 44 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

(limited to 'source/Irrlicht/CMeshSceneNode.cpp')

diff --git a/source/Irrlicht/CMeshSceneNode.cpp b/source/Irrlicht/CMeshSceneNode.cpp
index 1331dda..0bcd850 100644
--- a/source/Irrlicht/CMeshSceneNode.cpp
+++ b/source/Irrlicht/CMeshSceneNode.cpp
@@ -11,6 +11,11 @@
 #include "IAnimatedMesh.h"
 #include "IMaterialRenderer.h"
 #include "IFileSystem.h"
+#ifdef _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
+#include "CShadowVolumeSceneNode.h"
+#else
+#include "IShadowVolumeSceneNode.h"
+#endif // _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
 
 namespace irr
 {
@@ -23,7 +28,7 @@ namespace scene
 CMeshSceneNode::CMeshSceneNode(IMesh* mesh, ISceneNode* parent, ISceneManager* mgr, s32 id,
 			const core::vector3df& position, const core::vector3df& rotation,
 			const core::vector3df& scale)
-: IMeshSceneNode(parent, mgr, id, position, rotation, scale), Mesh(0),
+: IMeshSceneNode(parent, mgr, id, position, rotation, scale), Mesh(0), Shadow(0),
 	PassCount(0), ReadOnlyMaterials(false)
 {
 	#ifdef _DEBUG
@@ -37,6 +42,8 @@ CMeshSceneNode::CMeshSceneNode(IMesh* mesh, ISceneNode* parent, ISceneManager* m
 //! destructor
 CMeshSceneNode::~CMeshSceneNode()
 {
+	if (Shadow)
+		Shadow->drop();
 	if (Mesh)
 		Mesh->drop();
 }
@@ -102,6 +109,9 @@ void CMeshSceneNode::render()
 	driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
 	Box = Mesh->getBoundingBox();
 
+	if (Shadow && PassCount==1)
+		Shadow->updateShadowVolumes();
+
 	// for debug purposes only:
 
 	bool renderMeshes = true;
@@ -200,6 +210,12 @@ void CMeshSceneNode::render()
 //! or to remove attached childs.
 bool CMeshSceneNode::removeChild(ISceneNode* child)
 {
+	if (child && Shadow == child)
+	{
+		Shadow->drop();
+		Shadow = 0;
+	}
+
 	return ISceneNode::removeChild(child);
 }
 
@@ -256,6 +272,29 @@ void CMeshSceneNode::setMesh(IMesh* mesh)
 }
 
 
+//! Creates shadow volume scene node as child of this node
+//! and returns a pointer to it.
+IShadowVolumeSceneNode* CMeshSceneNode::addShadowVolumeSceneNode(
+		const IMesh* shadowMesh, s32 id, bool zfailmethod, f32 infinity)
+{
+#ifdef _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
+	if (!SceneManager->getVideoDriver()->queryFeature(video::EVDF_STENCIL_BUFFER))
+		return 0;
+
+	if (!shadowMesh)
+		shadowMesh = Mesh; // if null is given, use the mesh of node
+
+	if (Shadow)
+		Shadow->drop();
+
+	Shadow = new CShadowVolumeSceneNode(shadowMesh, this, SceneManager, id,  zfailmethod, infinity);
+	return Shadow;
+#else
+	return 0;
+#endif
+}
+
+
 void CMeshSceneNode::copyMaterials()
 {
 	Materials.clear();
@@ -306,6 +345,9 @@ ISceneNode* CMeshSceneNode::clone(ISceneNode* newParent, ISceneManager* newManag
 	nb->cloneMembers(this, newManager);
 	nb->ReadOnlyMaterials = ReadOnlyMaterials;
 	nb->Materials = Materials;
+	nb->Shadow = Shadow;
+	if ( nb->Shadow )
+		nb->Shadow->grab();
 
 	if (newParent)
 		nb->drop();
-- 
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