add .bullet loader for GPU demo

demo/gpudemo/rigidbody/Bullet2FileDemo.cpp

@@ -0,0 +1,40 @@
+
+#include "Bullet2FileDemo.h"
+#include "BulletDataExtractor.h"
+#include "GpuRigidBodyDemoInternalData.h"
+
+
+Bullet2FileDemo::Bullet2FileDemo()
+{
+	m_loader = 0;
+}
+Bullet2FileDemo::~Bullet2FileDemo()
+{
+	delete 	m_loader;
+}
+
+void Bullet2FileDemo::setupScene(const ConstructionInfo& ci)
+{
+	btAssert(ci.m_instancingRenderer);
+
+	const char* fileName="data/testFile.bullet";
+
+	FILE* f = 0;
+
+	const char* prefix[]={"./","../","../../","../../../","../../../../"};
+	int numPrefixes = sizeof(prefix)/sizeof(const char*);
+	char relativeFileName[1024];
+
+	for (int i=0;!f && i<numPrefixes;i++)
+	{
+		sprintf(relativeFileName,"%s%s",prefix[i],fileName);
+		f = fopen(relativeFileName,"rb");
+	}
+	if (f)
+	{
+		fclose(f);
+		createScene(*ci.m_instancingRenderer,*m_data->m_np,*m_data->m_rigidBodyPipeline,relativeFileName);
+	}
+//	m_loader = new btBulletDataExtractor(*ci.m_instancingRenderer,*m_data->m_np,*m_data->m_rigidBodyPipeline);
+//	m_loader->convertAllObjects(bulletFile);
+}