don't use GL_LINEAR_MIPMAP_LINEAR for shadow maps

optimize gpu upload (use glBufferSubData instead of glMapBuffer
Avoid checking char array against zero.

examples/RenderingExamples/TinyVRGui.h

@@ -0,0 +1,25 @@
+
+#ifndef TINY_VR_GUI_H
+#define TINY_VR_GUI_H
+
+#include "Bullet3Common/b3Transform.h"
+
+class TinyVRGui
+{
+	struct TinyVRGuiInternalData* m_data;
+
+public:
+
+	TinyVRGui(struct ComboBoxParams& params, struct CommonRenderInterface*	renderer);
+	virtual ~TinyVRGui();
+	
+	bool init();
+	void tick(b3Scalar deltaTime, const b3Transform& guiWorldTransform);
+
+	void clearTextArea();
+	void grapicalPrintf(const char* str,int rasterposx,int rasterposy,unsigned char red, unsigned char green, unsigned char blue, unsigned char alpha);
+
+};
+
+
+#endif //TINY_VR_GUI_H