quesa/Development/Source/Renderers/OpenGL QOGeometry.cpp,1.19,1.20

[James W. W. <jww...@us...>]

Update of /cvsroot/quesa/quesa/Development/Source/Renderers/OpenGL
In directory sc8-pr-cvs16.sourceforge.net:/tmp/cvs-serv26777/quesa/Development/Source/Renderers/OpenGL

Modified Files:
	QOGeometry.cpp 
Log Message:
New IsBoundsVisible method for TriMesh-level visibility culling.

Index: QOGeometry.cpp
===================================================================
RCS file: /cvsroot/quesa/quesa/Development/Source/Renderers/OpenGL/QOGeometry.cpp,v
retrieving revision 1.19
retrieving revision 1.20
diff -C2 -d -r1.19 -r1.20
*** QOGeometry.cpp	30 May 2007 19:28:49 -0000	1.19
--- QOGeometry.cpp	2 Jun 2007 22:51:52 -0000	1.20
***************
*** 55,58 ****
--- 55,59 ----
  #include "E3Memory.h"
  #include "E3View.h"
+ #include "E3Math.h"
  
  
***************
*** 1317,1320 ****
--- 1318,1338 ----
  }
  
+ 
+ /*!
+ 	@function	IsBoundsVisible
+ 	@abstract	Test whether a bounding box may be visible, for culling.
+ */
+ bool	QORenderer::Renderer::IsBoundsVisible( const TQ3BoundingBox& inLocalBox ) const
+ {
+ 	TQ3BoundingBox	frustumBox;
+ 	E3BoundingBox_Transform( &inLocalBox, &mMatrixState.GetLocalToFrustum(),
+ 		&frustumBox );
+ 	
+ 	return (frustumBox.min.x < 1.0f) &&
+ 		(frustumBox.max.x > -1.0f) &&
+ 		(frustumBox.min.y < 1.0f) &&
+ 		(frustumBox.max.y > -1.0f);
+ }
+ 
  /*!
  	@function		SubmitTriMesh
***************
*** 1339,1342 ****
--- 1357,1366 ----
  	}
  	
+ 	// Visibility culling
+ 	if ( ! IsBoundsVisible( inGeomData->bBox ))
+ 	{
+ 		return true;
+ 	}
+ 	
  	bool didHandle = false;