Expose API to set projective texture instead of using global.

examples/ExampleBrowser/OpenGLGuiHelper.h

@@ -63,6 +63,7 @@ struct OpenGLGuiHelper : public GUIHelperInterface
                                   int destinationHeight, int* numPixelsCopied);
 	
 	virtual void setProjectiveTextureMatrices(const float viewMatrix[16], const float projectionMatrix[16]);
+	virtual void setProjectiveTexture(bool useProjectiveTexture);
 
 	virtual void autogenerateGraphicsObjects(btDiscreteDynamicsWorld* rbWorld) ;