Added PostLoad methods to ensure all models have created vertex buffers and all materials have generated shaders before the user gains control of the camera, to fix hitching issues

src/Core/Resource/CMaterial.cpp

@@ -78,13 +78,16 @@ CMaterial* CMaterial::Clone()
     return pOut;
 }
 
-void CMaterial::GenerateShader()
+void CMaterial::GenerateShader(bool AllowRegen /*= true*/)
 {
-    delete mpShader;
-    mpShader = CShaderGenerator::GenerateShader(*this);
+    if (mShaderStatus != eShaderExists || AllowRegen)
+    {
+        delete mpShader;
+        mpShader = CShaderGenerator::GenerateShader(*this);
 
-    if (!mpShader->IsValidProgram()) mShaderStatus = eShaderFailed;
-    else mShaderStatus = eShaderExists;
+        if (!mpShader->IsValidProgram()) mShaderStatus = eShaderFailed;
+        else mShaderStatus = eShaderExists;
+    }
 }
 
 bool CMaterial::SetCurrent(FRenderOptions Options)

src/Core/Resource/CMaterial.h

@@ -76,7 +76,7 @@ public:
     CMaterial(EGame version, FVertexDescription vtxDesc);
     ~CMaterial();
     CMaterial* Clone();
-    void GenerateShader();
+    void GenerateShader(bool AllowRegen = true);
     bool SetCurrent(FRenderOptions Options);
     u64 HashParameters();
     void Update();

src/Core/Resource/Model/CModel.cpp

@@ -75,6 +75,20 @@ void CModel::BufferGL()
     mBuffered = true;
 }
 
+void CModel::GenerateMaterialShaders()
+{
+    for (u32 iSet = 0; iSet < mMaterialSets.size(); iSet++)
+    {
+        CMaterialSet *pSet = mMaterialSets[iSet];
+
+        for (u32 iMat = 0; iMat < pSet->NumMaterials(); iMat++)
+        {
+            CMaterial *pMat = pSet->MaterialByIndex(iMat);
+            pMat->GenerateShader(false);
+        }
+    }
+}
+
 void CModel::ClearGLBuffer()
 {
     mVBO.Clear();

src/Core/Resource/Model/CModel.h

@@ -23,6 +23,7 @@ public:
     ~CModel();
 
     void BufferGL();
+    void GenerateMaterialShaders();
     void ClearGLBuffer();
     void Draw(FRenderOptions Options, u32 MatSet);
     void DrawSurface(FRenderOptions Options, u32 Surface, u32 MatSet);

src/Core/Resource/Model/CStaticModel.cpp

@@ -89,6 +89,12 @@ void CStaticModel::BufferGL()
     mBuffered = true;
 }
 
+void CStaticModel::GenerateMaterialShaders()
+{
+    if (mpMaterial)
+        mpMaterial->GenerateShader(false);
+}
+
 void CStaticModel::ClearGLBuffer()
 {
     mVBO.Clear();

src/Core/Resource/Model/CStaticModel.h

@@ -22,6 +22,7 @@ public:
     void AddSurface(SSurface *pSurface);
 
     void BufferGL();
+    void GenerateMaterialShaders();
     void ClearGLBuffer();
     void Draw(FRenderOptions Options);
     void DrawSurface(FRenderOptions Options, u32 Surface);

src/Core/Scene/CModelNode.cpp

@@ -19,6 +19,15 @@ ENodeType CModelNode::NodeType()
     return eModelNode;
 }
 
+void CModelNode::PostLoad()
+{
+    if (mpModel)
+    {
+        mpModel->BufferGL();
+        mpModel->GenerateMaterialShaders();
+    }
+}
+
 void CModelNode::AddToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo)
 {
     if (!mpModel) return;

src/Core/Scene/CModelNode.h

@@ -18,6 +18,7 @@ public:
     explicit CModelNode(CScene *pScene, CSceneNode *pParent = 0, CModel *pModel = 0);
 
     virtual ENodeType NodeType();
+    virtual void PostLoad();
     virtual void AddToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo);
     virtual void Draw(FRenderOptions Options, int ComponentIndex, const SViewInfo& ViewInfo);
     virtual void DrawSelection();

src/Core/Scene/CScene.cpp

@@ -1,4 +1,5 @@
 #include "CScene.h"
+#include "CSceneIterator.h"
 #include "Core/Render/CGraphics.h"
 #include "Core/Resource/CResCache.h"
 #include "Core/Resource/CPoiToWorld.h"
@@ -14,6 +15,7 @@
 
 CScene::CScene()
     : mSplitTerrain(true)
+    , mRanPostLoad(false)
     , mNumNodes(0)
     , mpSceneRootNode(new CRootNode(this, nullptr))
     , mpArea(nullptr)
@@ -177,6 +179,7 @@ void CScene::SetActiveArea(CGameArea *pArea)
         }
     }
 
+    mRanPostLoad = false;
     Log::Write( TString::FromInt32(CSceneNode::NumNodes()) + " nodes" );
 }
 
@@ -185,6 +188,12 @@ void CScene::SetActiveWorld(CWorld* pWorld)
     mpWorld = pWorld;
 }
 
+void CScene::PostLoad()
+{
+    mpSceneRootNode->OnLoadFinished();
+    mRanPostLoad = true;
+}
+
 void CScene::ClearScene()
 {
     if (mpAreaRootNode)
@@ -202,6 +211,10 @@ void CScene::ClearScene()
 
 void CScene::AddSceneToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo)
 {
+    // Call PostLoad the first time the scene is rendered to ensure the OpenGL context has been created before it runs.
+    if (!mRanPostLoad)
+        PostLoad();
+
     // Override show flags in game mode
     FShowFlags ShowFlags = (ViewInfo.GameMode ? gkGameModeShowFlags : ViewInfo.ShowFlags);
     FNodeFlags NodeFlags = NodeFlagsForShowFlags(ShowFlags);

src/Core/Scene/CScene.h

@@ -25,6 +25,7 @@ class CScene
     friend class CSceneIterator;
     
     bool mSplitTerrain;
+    bool mRanPostLoad;
 
     u32 mNumNodes;
     CRootNode *mpSceneRootNode;
@@ -52,6 +53,7 @@ public:
     CLightNode* CreateLightNode(CLight *pLight);
     void SetActiveArea(CGameArea *pArea);
     void SetActiveWorld(CWorld *pWorld);
+    void PostLoad();
     void ClearScene();
     void AddSceneToRenderer(CRenderer *pRenderer, const SViewInfo& rkViewInfo);
     SRayIntersection SceneRayCast(const CRay& rkRay, const SViewInfo& rkViewInfo);

src/Core/Scene/CSceneIterator.h

@@ -36,6 +36,11 @@ public:
         return mpCurNode;
     }
 
+    inline operator bool() const
+    {
+        return DoneIterating();
+    }
+
     inline CSceneNode* operator*() const
     {
         return mpCurNode;

src/Core/Scene/CSceneNode.cpp

@@ -80,6 +80,14 @@ CColor CSceneNode::WireframeColor() const
 }
 
 // ************ MAIN FUNCTIONALITY ************
+void CSceneNode::OnLoadFinished()
+{
+    PostLoad();
+
+    for (auto it = mChildren.begin(); it != mChildren.end(); it++)
+        (*it)->OnLoadFinished();
+}
+
 void CSceneNode::Unparent()
 {
     // May eventually want to reset XForm so global position = local position

src/Core/Scene/CSceneNode.h

@@ -67,6 +67,7 @@ public:
     virtual CColor TintColor(const SViewInfo& ViewInfo) const;
     virtual CColor WireframeColor() const;
 
+    void OnLoadFinished();
     void Unparent();
     void RemoveChild(CSceneNode *pChild);
     void DeleteChildren();
@@ -121,14 +122,8 @@ public:
     void SetVisible(bool Visible);
 
     // Static
-    static int NumNodes();
+    inline static int NumNodes() { return smNumNodes; }
     static CColor skSelectionTint;
 };
 
-// ************ INLINE FUNCTIONS ************
-inline int CSceneNode::NumNodes()
-{
-    return smNumNodes;
-}
-
 #endif // CSCENENODE_H

src/Core/Scene/CScriptNode.cpp

@@ -74,6 +74,15 @@ ENodeType CScriptNode::NodeType()
     return eScriptNode;
 }
 
+void CScriptNode::PostLoad()
+{
+    if (mpActiveModel)
+    {
+        mpActiveModel->BufferGL();
+        mpActiveModel->GenerateMaterialShaders();
+    }
+}
+
 void CScriptNode::OnTransformed()
 {
     if (mpInstance)

src/Core/Scene/CScriptNode.h

@@ -27,6 +27,7 @@ class CScriptNode : public CSceneNode
 public:
     CScriptNode(CScene *pScene, CSceneNode *pParent = 0, CScriptObject *pObject = 0);
     ENodeType NodeType();
+    void PostLoad();
     void OnTransformed();
     void AddToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo);
     void Draw(FRenderOptions Options, int ComponentIndex, const SViewInfo& ViewInfo);

src/Core/Scene/CStaticNode.cpp

@@ -19,6 +19,15 @@ ENodeType CStaticNode::NodeType()
     return eStaticNode;
 }
 
+void CStaticNode::PostLoad()
+{
+    if (mpModel)
+    {
+        mpModel->BufferGL();
+        mpModel->GenerateMaterialShaders();
+    }
+}
+
 void CStaticNode::AddToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo)
 {
     if (!mpModel) return;

src/Core/Scene/CStaticNode.h

@@ -11,6 +11,7 @@ class CStaticNode : public CSceneNode
 public:
     CStaticNode(CScene *pScene, CSceneNode *pParent = 0, CStaticModel *pModel = 0);
     ENodeType NodeType();
+    void PostLoad();
     void AddToRenderer(CRenderer *pRenderer, const SViewInfo& ViewInfo);
     void Draw(FRenderOptions Options, int ComponentIndex, const SViewInfo& ViewInfo);
     void DrawSelection();