[FEATURE] working gui buttons

src/gui/gui_element.h

@@ -0,0 +1,82 @@
+#pragma once
+
+#include "../toolbox/toolbox.h"
+#include <glm/gtc/matrix_transform.hpp>
+
+namespace gui
+{
+	/*
+	 * Structure for representing a gui item to display on the screen
+	 *
+	 * texture  = The texture for the gui
+	 * position = The center position of the gui
+	 * scale    = The size (scale) of the gui
+	 */
+	struct GuiTexture
+	{
+		int texture;
+		glm::vec2 position;
+		glm::vec2 scale;
+
+		GuiTexture(int texture, glm::vec2 position, glm::vec2 scale): texture(texture), position(position), scale(scale)
+		{
+			scale.x /= (WINDOW_WIDTH / WINDOW_HEIGT);
+		}
+	};
+
+
+	/*
+	 * This class represents a gui item which can be interacted with
+	 */
+	class InteractableGui : public GuiTexture
+	{
+	private:
+		int default_texture;
+		int clicked_texture = 0;
+		int hover_texture = 0;
+
+		bool is_hovering = false;
+		bool is_clicking = false;
+
+		glm::vec2 minXY;
+		glm::vec2 maxXY;
+		
+	public:
+		InteractableGui(int default_texture, glm::vec2 position, glm::vec2 scale);
+
+		void Update(GLFWwindow* window);
+
+		virtual void OnClick() = 0;
+		virtual void OnEnter() = 0;
+		virtual void OnExit() = 0;
+
+		void SetClickedTexture(int texture) { clicked_texture = texture; }
+		void SetHoverTexture(int texture) { hover_texture = texture; }
+	
+	private:
+		bool IsHoveringAbove(GLFWwindow* window);
+	};
+	
+	/*
+	 * This class represents a button
+	 */
+	class Button : public InteractableGui
+	{
+	private:
+		void (*on_click_action)();
+		void (*on_enter_action)();
+		void (*on_exit_action)();
+
+	public:
+		Button(int default_texture, glm::vec2 position, glm::vec2 scale) : InteractableGui(default_texture, position, scale) {}
+
+		void SetOnClickAction(void (*fun)()) { on_click_action = fun; }
+		void SetOnEnterAction(void (*fun)()) { on_enter_action = fun; }
+		void SetOnExitAction(void (*fun)()) { on_exit_action = fun; }
+	
+	protected:
+		void OnClick() override { if (on_click_action != nullptr) on_click_action(); }
+		void OnEnter() override { if (on_enter_action != nullptr) on_enter_action(); }
+		void OnExit() override { if (on_exit_action != nullptr) on_exit_action(); }
+	};
+}