Modify the depth buffer value in TinyRenderer to be consistent as in OpenGL.

examples/OpenGLWindow/SimpleCamera.cpp

@@ -383,3 +383,13 @@ float	SimpleCamera::getAspectRatio() const
 {
 	return m_data->m_aspect;
 }
+
+float SimpleCamera::getCameraFrustumFar() const
+{
+    return m_data->m_frustumZFar;
+}
+
+float SimpleCamera::getCameraFrustumNear() const
+{
+    return m_data->m_frustumZNear;
+}

examples/OpenGLWindow/SimpleCamera.h

@@ -47,6 +47,9 @@ struct SimpleCamera : public CommonCameraInterface
 
 	virtual void	setAspectRatio(float ratio);
 	virtual float	getAspectRatio() const;
+    
+    virtual float getCameraFrustumFar() const;
+    virtual float getCameraFrustumNear() const;
 };
 
-#endif //SIMPLE_CAMERA_H
+#endif //SIMPLE_CAMERA_H