OpenGL: Implement textures

include/Nazara/Renderer/Texture.hpp

@@ -40,6 +40,8 @@ namespace Nz
 
 			virtual bool Update(const void* ptr) = 0;
 
+			static inline unsigned int GetLevelSize(unsigned int size, unsigned int level);
+
 			Texture& operator=(const Texture&) = delete;
 			Texture& operator=(Texture&&) = delete;
 	};

include/Nazara/Renderer/Texture.inl

@@ -7,6 +7,13 @@
 
 namespace Nz
 {
+	inline unsigned int Texture::GetLevelSize(unsigned int size, unsigned int level)
+	{
+		if (size == 0) // Possible dans le cas d'une image invalide
+			return 0;
+
+		return std::max(size >> level, 1U);
+	}
 }
 
 #include <Nazara/Renderer/DebugOff.hpp>