1 files changed, 118 insertions, 0 deletions
diff --git a/game/client/c_func_reflective_glass.cpp b/game/client/c_func_reflective_glass.cpp
new file mode 100644
index 0000000..994d62b
--- /dev/null
+++ b/game/client/c_func_reflective_glass.cpp
@@ -0,0 +1,118 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+#include "cbase.h"
+#include "view_shared.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+class C_FuncReflectiveGlass : public C_BaseEntity
+{
+public:
+	DECLARE_CLASS( C_FuncReflectiveGlass, C_BaseEntity );
+	DECLARE_CLIENTCLASS();
+
+// C_BaseEntity.
+public:
+	C_FuncReflectiveGlass();
+	virtual ~C_FuncReflectiveGlass();
+
+	virtual bool	ShouldDraw();
+
+	C_FuncReflectiveGlass	*m_pNext;
+};
+
+IMPLEMENT_CLIENTCLASS_DT( C_FuncReflectiveGlass, DT_FuncReflectiveGlass, CFuncReflectiveGlass )
+END_RECV_TABLE()
+
+
+//-----------------------------------------------------------------------------
+// Globals
+//-----------------------------------------------------------------------------
+C_EntityClassList<C_FuncReflectiveGlass> g_ReflectiveGlassList;
+template<> C_FuncReflectiveGlass *C_EntityClassList<C_FuncReflectiveGlass>::m_pClassList = NULL;
+
+C_FuncReflectiveGlass* GetReflectiveGlassList()
+{
+	return g_ReflectiveGlassList.m_pClassList;
+}
+
+
+//-----------------------------------------------------------------------------
+// Constructor, destructor
+//-----------------------------------------------------------------------------
+C_FuncReflectiveGlass::C_FuncReflectiveGlass()
+{
+	g_ReflectiveGlassList.Insert( this );
+}
+
+C_FuncReflectiveGlass::~C_FuncReflectiveGlass()
+{
+	g_ReflectiveGlassList.Remove( this );
+}
+
+
+bool C_FuncReflectiveGlass::ShouldDraw()
+{
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Do we have reflective glass in view?
+//-----------------------------------------------------------------------------
+bool IsReflectiveGlassInView( const CViewSetup& view, cplane_t &plane )
+{
+	// Early out if no cameras
+	C_FuncReflectiveGlass *pReflectiveGlass = GetReflectiveGlassList();
+	if ( !pReflectiveGlass )
+		return false;
+
+	Frustum_t frustum;
+	GeneratePerspectiveFrustum( view.origin, view.angles, view.zNear, view.zFar, view.fov, view.m_flAspectRatio, frustum );
+
+	cplane_t localPlane;
+	Vector vecOrigin, vecWorld, vecDelta, vecForward;
+	AngleVectors( view.angles, &vecForward, NULL, NULL );
+
+	for ( ; pReflectiveGlass != NULL; pReflectiveGlass = pReflectiveGlass->m_pNext )
+	{
+		if ( pReflectiveGlass->IsDormant() )
+			continue;
+
+		Vector vecMins, vecMaxs;
+		pReflectiveGlass->GetRenderBoundsWorldspace( vecMins, vecMaxs );
+		if ( R_CullBox( vecMins, vecMaxs, frustum ) )
+			continue;
+
+		const model_t *pModel = pReflectiveGlass->GetModel();
+		const matrix3x4_t& mat = pReflectiveGlass->EntityToWorldTransform();
+
+		int nCount = modelinfo->GetBrushModelPlaneCount( pModel );
+		for ( int i = 0; i < nCount; ++i )
+		{
+			modelinfo->GetBrushModelPlane( pModel, i, localPlane, &vecOrigin );
+
+			MatrixTransformPlane( mat, localPlane, plane );			// Transform to world space
+			VectorTransform( vecOrigin, mat, vecWorld );
+					 
+			if ( view.origin.Dot( plane.normal ) <= plane.dist )	// Check for view behind plane
+				continue;
+			
+			VectorSubtract( vecWorld, view.origin, vecDelta );		// Backface cull
+			if ( vecDelta.Dot( plane.normal ) >= 0 )
+				continue;
+
+			return true;
+		}
+	}
+
+	return false;
+}
+
+
+