Graphics: Rework shadowing (add cascaded shadow mapping)

- Add support for per-viewer shadows
- Add cascaded shadow mapping for directional lights (wip)
- Rework the way lights are sent to the shaders (they are now selected once per viewer)
- Fixes PointLight shadow mapping (using a dedicated pass)
- Lights out of frustum for every viewers are no longer processed (wip)

include/Nazara/Graphics/LightShadowData.inl

@@ -6,6 +6,20 @@
 
 namespace Nz
 {
+	inline LightShadowData::LightShadowData() :
+	m_isPerViewer(false)
+	{
+	}
+
+	inline void LightShadowData::UpdatePerViewerStatus(bool isPerViewer)
+	{
+		m_isPerViewer = isPerViewer;
+	}
+
+	inline bool LightShadowData::IsPerViewer() const
+	{
+		return m_isPerViewer;
+	}
 }
 
 #include <Nazara/Graphics/DebugOff.hpp>