Add light support (WIP)

include/Nazara/Graphics/ForwardFramePipeline.inl

@@ -3,10 +3,25 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Graphics/ForwardFramePipeline.hpp>
+#include <Nazara/Core/Algorithm.hpp>
 #include <Nazara/Graphics/Debug.hpp>
 
 namespace Nz
 {
+	inline std::size_t ForwardFramePipeline::LightKeyHasher::operator()(const LightKey& lightKey) const
+	{
+		std::size_t lightHash = 5;
+		auto CombineHash = [](std::size_t currentHash, std::size_t newHash)
+		{
+			return currentHash * 23 + newHash;
+		};
+
+		std::hash<const Light*> lightPtrHasher;
+		for (std::size_t i = 0; i < lightKey.size(); ++i)
+			lightHash = CombineHash(lightHash, lightPtrHasher(lightKey[i]));
+
+		return lightHash;
+	}
 }
 
 #include <Nazara/Graphics/DebugOff.hpp>