Initial work on batch raycast support.

Extras/BulletMultiThreaded/SpuBatchRaycaster.cpp

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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2007 Erwin Coumans  http://bulletphysics.com
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <new>
+#include "SpuBatchRaycaster.h"
+
+SpuBatchRaycaster::SpuBatchRaycaster (class	btThreadSupportInterface* threadInterface, int maxNumOutstandingTasks, btCollisionObjectArray& castUponObjects, int numCastUponObjects)
+{
+	numCastUponObjectWrappers = numCastUponObjects;
+	m_threadInterface = threadInterface;
+
+	castUponObjectWrappers = new SpuCollisionObjectWrapper[numCastUponObjects];
+
+	for (int i = 0; i < numCastUponObjectWrappers; i++)
+	{
+		new (&castUponObjectWrappers[i]) SpuCollisionObjectWrapper(castUponObjects[i]);
+	}
+
+	m_spuRaycastTaskProcess = new SpuRaycastTaskProcess(m_threadInterface,maxNumOutstandingTasks); // FIXME non constant
+}
+
+SpuBatchRaycaster::~SpuBatchRaycaster ()
+{
+}
+
+void
+SpuBatchRaycaster::addRay (const btVector3& rayFrom, const btVector3& rayTo)
+{
+	SpuRaycastTaskWorkUnitOut workUnitOut;
+	workUnitOut.hitFraction = 0.99;
+	workUnitOut.hitNormal = btVector3(0.0, 1.0, 0.0);
+
+	rayBatchOutput.push_back (workUnitOut);
+
+	SpuRaycastTaskWorkUnit workUnit;
+	workUnit.rayFrom = rayFrom;
+	workUnit.rayTo = rayTo;
+	rayBatch.push_back (workUnit);
+}
+
+void
+SpuBatchRaycaster::clearRays ()
+{
+	rayBatch.clear ();
+	rayBatchOutput.clear ();
+}
+
+void
+SpuBatchRaycaster::performBatchRaycast ()
+{
+	m_spuRaycastTaskProcess->initialize2 (castUponObjectWrappers, numCastUponObjectWrappers);
+
+	for (int i = 0; i < rayBatch.size(); i++)
+	{
+		rayBatch[i].output = &rayBatchOutput[i]; // assign output memory location
+		m_spuRaycastTaskProcess->addWorkToTask(rayBatch[i]);
+	}
+
+	m_spuRaycastTaskProcess->flush2 ();
+}
+
+const SpuRaycastTaskWorkUnitOut&
+SpuBatchRaycaster::operator [] (int i) const
+{
+	return rayBatchOutput[i];
+}
+
+int
+SpuBatchRaycaster::getNumRays () const
+{
+	return rayBatchOutput.size();
+}