BGE: Adding support for the Cast Only material option.

Note: This does not add support for the option in the viewport.

source/gameengine/Converter/BL_BlenderDataConversion.cpp

@@ -611,6 +611,10 @@ static bool ConvertMaterial(
 
 		// cast shadows?
 		material->ras_mode |= ( mat->mode & MA_SHADBUF )?CAST_SHADOW:0;
+
+		// only shadows?
+		material->ras_mode |= ( mat->mode & MA_ONLYCAST )?ONLY_SHADOW:0;
+
 		MTex *mttmp = 0;
 		int valid_index = 0;
 		

source/gameengine/Ketsji/BL_Material.h

@@ -144,7 +144,8 @@ enum BL_ras_mode
 	WIRE=64,
 	CAST_SHADOW=128,
 	TEX=256,
-	TWOSIDED=512
+	TWOSIDED=512,
+	ONLY_SHADOW=1024,
 };
 
 // -------------------------------------

source/gameengine/Ketsji/KX_BlenderMaterial.cpp

@@ -110,6 +110,7 @@ void KX_BlenderMaterial::Initialize(
 	m_flag |= ((mMaterial->ras_mode & USE_LIGHT)!=0)? RAS_MULTILIGHT: 0;
 	m_flag |= (mMaterial->glslmat)? RAS_BLENDERGLSL: 0;
 	m_flag |= ((mMaterial->ras_mode & CAST_SHADOW)!=0)? RAS_CASTSHADOW: 0;
+	m_flag |= ((mMaterial->ras_mode & ONLY_SHADOW)!=0)? RAS_ONLYSHADOW: 0;
 
 	// test the sum of the various modes for equality
 	// so we can ether accept or reject this material

source/gameengine/Rasterizer/RAS_IPolygonMaterial.cpp

@@ -282,6 +282,11 @@ bool RAS_IPolyMaterial::CastsShadows() const
 	return (m_flag & RAS_CASTSHADOW) != 0;
 }
 
+bool RAS_IPolyMaterial::OnlyShadow() const
+{
+	return (m_flag & RAS_ONLYSHADOW) != 0;
+}
+
 bool RAS_IPolyMaterial::UsesObjectColor() const
 {
 	return !(m_flag & RAS_BLENDERGLSL);

source/gameengine/Rasterizer/RAS_IPolygonMaterial.h

@@ -61,7 +61,8 @@ enum MaterialProps
 	RAS_NORMAL		=256,
 	RAS_DEFMULTI	=512,
 	RAS_BLENDERGLSL =1024,
-	RAS_CASTSHADOW	=2048
+	RAS_CASTSHADOW	=2048,
+	RAS_ONLYSHADOW	=4096,
 };
 
 /**
@@ -174,6 +175,7 @@ public:
 	virtual bool		UsesLighting(RAS_IRasterizer *rasty) const;
 	virtual bool		UsesObjectColor() const;
 	virtual bool		CastsShadows() const;
+	virtual bool		OnlyShadow() const;
 
 	virtual void		Replace_IScene(SCA_IScene *val) {} /* overridden by KX_BlenderMaterial */
 

source/gameengine/Rasterizer/RAS_MaterialBucket.cpp

@@ -587,6 +587,9 @@ bool RAS_MaterialBucket::ActivateMaterial(const MT_Transform& cameratrans, RAS_I
 	if (rasty->GetDrawingMode() == RAS_IRasterizer::KX_SHADOW && !m_material->CastsShadows())
 		return false;
 
+	if (rasty->GetDrawingMode() != RAS_IRasterizer::KX_SHADOW && m_material->OnlyShadow())
+		return false;
+
 	if (!rasty->SetMaterial(*m_material))
 		return false;