From da1f38f99d3b8a07ed4ddd905f8e7d7c6e25f945 Mon Sep 17 00:00:00 2001
From: Benoit Bolsee <benoit.bolsee@online.be>
Date: Sun, 25 May 2008 14:37:39 +0000
Subject: Apply BGE patch 11137: Render objects with negative scaling correctly
 (as in Blender)

---
 .../gameengine/BlenderRoutines/KX_BlenderRenderTools.cpp | 16 ++++++++++++++++
 .../gameengine/BlenderRoutines/KX_BlenderRenderTools.h   |  2 ++
 source/gameengine/GamePlayer/common/GPC_RenderTools.cpp  | 16 ++++++++++++++++
 source/gameengine/GamePlayer/common/GPC_RenderTools.h    |  2 ++
 source/gameengine/Ketsji/KX_GameObject.cpp               |  3 ++-
 source/gameengine/Ketsji/KX_GameObject.h                 |  9 +++++++++
 source/gameengine/Rasterizer/RAS_IRenderTools.h          |  1 +
 source/gameengine/Rasterizer/RAS_MaterialBucket.cpp      |  2 ++
 8 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.cpp b/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.cpp
index a656c5e5523..ffd66655069 100644
--- a/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.cpp
+++ b/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.cpp
@@ -125,6 +125,22 @@ void KX_BlenderRenderTools::BeginFrame(RAS_IRasterizer* rasty)
 
 }
 
+void KX_BlenderRenderTools::SetClientObject(void* obj)
+{
+	if (m_clientobject != obj)
+	{
+		if (obj == NULL || !((KX_GameObject*)obj)->IsNegativeScaling())
+		{
+			glFrontFace(GL_CCW);
+		} else 
+		{
+			glFrontFace(GL_CW);
+		}
+		m_clientobject = obj;
+		m_modified = true;
+	}
+}
+
 bool KX_BlenderRenderTools::RayHit(KX_ClientObjectInfo* client, MT_Point3& hit_point, MT_Vector3& hit_normal, void * const data)
 {
 	double* const oglmatrix = (double* const) data;
diff --git a/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.h b/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.h
index 662f5bd9af1..31eaa14d66b 100644
--- a/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.h
+++ b/source/gameengine/BlenderRoutines/KX_BlenderRenderTools.h
@@ -105,6 +105,8 @@ public:
 
 	virtual	void Render2DFilters(RAS_ICanvas* canvas);
 
+	virtual void SetClientObject(void* obj);
+
 };
 
 #endif //__KX_BLENDERRENDERTOOLS
diff --git a/source/gameengine/GamePlayer/common/GPC_RenderTools.cpp b/source/gameengine/GamePlayer/common/GPC_RenderTools.cpp
index edda7657ef9..885981a2898 100644
--- a/source/gameengine/GamePlayer/common/GPC_RenderTools.cpp
+++ b/source/gameengine/GamePlayer/common/GPC_RenderTools.cpp
@@ -462,6 +462,22 @@ int GPC_RenderTools::applyLights(int objectlayer)
 
 }
 
+void GPC_RenderTools::SetClientObject(void* obj)
+{
+	if (m_clientobject != obj)
+	{
+		if (obj == NULL || !((KX_GameObject*)obj)->IsNegativeScaling())
+		{
+			glFrontFace(GL_CCW);
+		} else 
+		{
+			glFrontFace(GL_CW);
+		}
+		m_clientobject = obj;
+		m_modified = true;
+	}
+}
+
 bool GPC_RenderTools::RayHit(KX_ClientObjectInfo* client, MT_Point3& hit_point, MT_Vector3& hit_normal, void * const data)
 {
 	double* const oglmatrix = (double* const) data;
diff --git a/source/gameengine/GamePlayer/common/GPC_RenderTools.h b/source/gameengine/GamePlayer/common/GPC_RenderTools.h
index 9b86869af73..ee0212da643 100644
--- a/source/gameengine/GamePlayer/common/GPC_RenderTools.h
+++ b/source/gameengine/GamePlayer/common/GPC_RenderTools.h
@@ -153,6 +153,8 @@ public:
 
 	virtual	void Render2DFilters(RAS_ICanvas* canvas);
 
+	virtual void SetClientObject(void* obj);
+
 protected:
 	/** 
 	 * Copied from KX_BlenderGL.cpp in KX_blenderhook
diff --git a/source/gameengine/Ketsji/KX_GameObject.cpp b/source/gameengine/Ketsji/KX_GameObject.cpp
index 5fd5d2d5492..dada47e2fa4 100644
--- a/source/gameengine/Ketsji/KX_GameObject.cpp
+++ b/source/gameengine/Ketsji/KX_GameObject.cpp
@@ -77,6 +77,7 @@ KX_GameObject::KX_GameObject(
 	m_layer(0),
 	m_bSuspendDynamics(false),
 	m_bUseObjectColor(false),
+	m_bIsNegativeScaling(false),
 	m_bVisible(true),
 	m_pPhysicsController1(NULL),
 	m_pPhysicsEnvironment(NULL),
@@ -335,7 +336,7 @@ double*	KX_GameObject::GetOpenGLMatrix()
 	trans.setBasis(GetSGNode()->GetWorldOrientation());
 	
 	MT_Vector3 scaling = GetSGNode()->GetWorldScaling();
-	
+	m_bIsNegativeScaling = ((scaling[0] < 0.0) ^ (scaling[1] < 0.0) ^ (scaling[2] < 0.0)) ? true : false;
 	trans.scale(scaling[0], scaling[1], scaling[2]);
 	trans.getValue(fl);
 
diff --git a/source/gameengine/Ketsji/KX_GameObject.h b/source/gameengine/Ketsji/KX_GameObject.h
index 6e765978821..3758651f53d 100644
--- a/source/gameengine/Ketsji/KX_GameObject.h
+++ b/source/gameengine/Ketsji/KX_GameObject.h
@@ -75,6 +75,7 @@ protected:
 	
 	bool								m_bSuspendDynamics;
 	bool								m_bUseObjectColor;
+	bool								m_bIsNegativeScaling;
 	MT_Vector4							m_objectColor;
 
 	// Is this object set to be visible? Only useful for the
@@ -598,6 +599,14 @@ public:
 		void
 	);
 		
+	/**
+	 * Get the negative scaling state
+	 */
+		bool
+	IsNegativeScaling(
+		void
+	) { return m_bIsNegativeScaling; }
+
 	/**
 	 * @section Logic bubbling methods.
 	 */
diff --git a/source/gameengine/Rasterizer/RAS_IRenderTools.h b/source/gameengine/Rasterizer/RAS_IRenderTools.h
index 16e15653c82..bcbf907741b 100644
--- a/source/gameengine/Rasterizer/RAS_IRenderTools.h
+++ b/source/gameengine/Rasterizer/RAS_IRenderTools.h
@@ -146,6 +146,7 @@ public:
 		int layer
 	)=0;
 
+	virtual
 		void	
 	SetClientObject(
 		void* obj
diff --git a/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp b/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
index 02e84f8a243..96ce220ae4d 100644
--- a/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
+++ b/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
@@ -325,6 +325,8 @@ void RAS_MaterialBucket::Render(const MT_Transform& cameratrans,
 		while (ActivateMaterial(cameratrans, rasty, rendertools, drawmode))
 			RenderMeshSlot(cameratrans, rasty, rendertools, *it, drawmode);
 	}
+	// to reset the eventual GL_CW mode
+	rendertools->SetClientObject(NULL);
 }
 
 
-- 
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