From 691b6b712df5ab5345bd0b5b0848e968bb089d0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivar=20J=C3=B6nsson?= <chunktreasure@gmail.com>
Date: Fri, 29 Dec 2023 01:36:03 +0100
Subject: [PATCH] Started work on console variables

---
 .../Volt/Console/ConsoleVariableRegistry.h    | 151 ++++++++++++++++++
 .../Volt/src/Volt/Rendering/SceneRenderer.cpp |   4 +
 2 files changed, 155 insertions(+)
 create mode 100644 Volt/Volt/src/Volt/Console/ConsoleVariableRegistry.h

diff --git a/Volt/Volt/src/Volt/Console/ConsoleVariableRegistry.h b/Volt/Volt/src/Volt/Console/ConsoleVariableRegistry.h
new file mode 100644
index 000000000..6764eef0a
--- /dev/null
+++ b/Volt/Volt/src/Volt/Console/ConsoleVariableRegistry.h
@@ -0,0 +1,151 @@
+#pragma once
+
+#include "Volt/Core/Base.h"
+
+#include <unordered_map>
+#include <string_view>
+
+namespace Volt
+{
+	class RegisteredConsoleVariableBase
+	{
+	public:
+		virtual const void* Get() const = 0;
+		virtual void Set(const void* value) = 0;
+
+		virtual std::string_view GetName() const = 0;
+		virtual std::string_view GetDescription() const = 0;
+	};
+
+	template<typename T> 
+	class RegisteredConsoleVariable : public RegisteredConsoleVariableBase
+	{
+	public:
+		RegisteredConsoleVariable(std::string_view variableName, const T& defaultValue, std::string_view description);
+
+		const void* Get() const override;
+		void Set(const void* value) override;
+
+		std::string_view GetName() const override { return m_variableName; }
+		std::string_view GetDescription() const override { return m_description; }
+
+	private:
+		T m_value;
+		std::string_view m_variableName;
+		std::string_view m_description;
+	};
+
+	template<typename T>
+	class ConsoleVariable
+	{
+	public:
+		ConsoleVariable(std::string_view variableName, const T& defaultValue, std::string_view description);
+
+		const T& GetValue() const { return *reinterpret_cast<T*>(m_variableReference->Get()); }
+		void SetValue(const T& value) { m_variableReference->Set(&value); }
+
+		T& operator=(const T& other)
+		{
+			if (this == &other)
+			{
+				return GetValue();
+			}
+
+			SetValue(other);
+		}
+
+	private:
+		Weak<RegisteredConsoleVariable<T>> m_variableReference;
+	};
+
+	template<typename T>
+	class ConsoleVariableRef
+	{
+	public:
+		ConsoleVariableRef(std::string_view variableName);
+
+		const T& GetValue() const { return *reinterpret_cast<T*>(m_variableReference->Get()); }
+		void SetValue(const T& value) { m_variableReference->Set(&value); }
+
+		T& operator=(const T& other)
+		{
+			if (this == &other)
+			{
+				return GetValue();
+			}
+
+			SetValue(other);
+		}
+
+	private:
+		Weak<RegisteredConsoleVariable<T>> m_variableReference;
+	};
+
+	class ConsoleVariableRegistry
+	{
+	public:
+		template<typename T>
+		static Weak<RegisteredConsoleVariable<T>> RegisterVariable(std::string_view variableName, const T& defaultValue, std::string_view description);
+
+		template<typename T>
+		static Weak<RegisteredConsoleVariable<T>> FindVariable(std::string_view variableName);
+
+		static std::unordered_map<std::string_view, Ref<RegisteredConsoleVariableBase>>& GetRegisteredVariables() { return s_registeredVariables; }
+
+	private:
+		inline static std::unordered_map<std::string_view, Ref<RegisteredConsoleVariableBase>> s_registeredVariables;
+	};
+
+	template<typename T>
+	inline RegisteredConsoleVariable<T>::RegisteredConsoleVariable(std::string_view variableName, const T& defaultValue, std::string_view description)
+		: m_value(defaultValue)
+	{
+	}
+
+	template<typename T>
+	inline const void* RegisteredConsoleVariable<T>::Get() const
+	{
+		return reinterpret_cast<const void*>(&m_value);
+	}
+
+	template<typename T>
+	inline void RegisteredConsoleVariable<T>::Set(const void* value)
+	{
+		m_value = *reinterpret_cast<const T*>(value);
+	}
+
+	template<typename T>
+	inline ConsoleVariable<T>::ConsoleVariable(std::string_view variableName, const T& defaultValue, std::string_view description)
+	{
+		m_variableReference = ConsoleVariableRegistry::RegisterVariable<T>(variableName, defaultValue, description);
+	}
+
+	template<typename T>
+	inline Weak<RegisteredConsoleVariable<T>> ConsoleVariableRegistry::RegisterVariable(std::string_view variableName, const T& defaultValue, std::string_view description)
+	{
+		Ref<RegisteredConsoleVariable<T>> consoleVariable = CreateRef<RegisteredConsoleVariable<T>>(variableName, defaultValue, description);
+
+		VT_CORE_ASSERT(!s_registeredVariables.contains(variableName), "Command variable with name already registered!");
+		s_registeredVariables[variableName] = consoleVariable;
+
+		return consoleVariable;
+	}
+	
+	template<typename T>
+	inline Weak<RegisteredConsoleVariable<T>> ConsoleVariableRegistry::FindVariable(std::string_view variableName)
+	{
+		if (s_registeredVariables.contains(variableName))
+		{
+			return s_registeredVariables.at(variableName);
+		}
+
+		return Weak<RegisteredConsoleVariable<T>>();
+	}
+
+	template<typename T>
+	inline ConsoleVariableRef<T>::ConsoleVariableRef(std::string_view variableName)
+	{
+		m_variableReference = ConsoleVariableRegistry::FindVariable(variableName);
+		VT_CORE_ASSERT(m_variableReference, "Variable with name not found!");
+	}
+}
diff --git a/Volt/Volt/src/Volt/Rendering/SceneRenderer.cpp b/Volt/Volt/src/Volt/Rendering/SceneRenderer.cpp
index dc61ffef0..3398fe2d1 100644
--- a/Volt/Volt/src/Volt/Rendering/SceneRenderer.cpp
+++ b/Volt/Volt/src/Volt/Rendering/SceneRenderer.cpp
@@ -78,8 +78,12 @@
 #include "Volt/Utility/Noise.h"
 #include "Volt/Platform/ThreadUtility.h"
 
+#include "Volt/Console/ConsoleVariableRegistry.h"
+
 namespace Volt
 {
+	static ConsoleVariable<int32_t> s_testCVar = ConsoleVariable<int32_t>("r.test", 0, "Test Variable");
+
 	namespace Utility
 	{
 		inline static Ref<RenderPipeline> CreateRenderPipeline(Ref<Shader> shader, std::vector<FramebufferAttachment> attachments, std::string_view name, CompareOperator depthCompare = CompareOperator::GreaterEqual)