feat(ui): add Rect widget with fill, color, and parent-relative sizing

include/Cubed/render/renderer.hpp

@@ -12,6 +12,7 @@
 #include "Cubed/shader.hpp"
 #include "Cubed/ui/image.hpp"
 #include "Cubed/ui/label.hpp"
+#include "Cubed/ui/rect.hpp"
 
 #include <glm/glm.hpp>
 #include <vector>
@@ -33,7 +34,7 @@ public:
     void render_world(ClientWorld& world);
     void render_lable(const Label& label);
     void render_image(const Image& image);
-
+    void render_rect(const Rect& rect);
     void begin_render_ui();
     void end_render_ui();
 

include/Cubed/shader.hpp

@@ -40,6 +40,9 @@ public:
         } else if constexpr (is_same_v<dT, glm::mat4>) {
             glUniformMatrix4fv(loc(location), 1, GL_FALSE,
                                glm::value_ptr(value));
+
+        } else if constexpr (is_same_v<dT, glm::vec4>) {
+            glUniform4fv(loc(location), 1, glm::value_ptr(value));
         } else {
             static_assert(always_false<dT>::value, "Unknown Type");
         }

include/Cubed/ui/column_layout.hpp

@@ -12,6 +12,9 @@ public:
 
     void update(float dt) override;
 
+    float width() const override;
+    float height() const override;
+
     void set_spacing(int spacing);
     // No need for parent node pointer; do not modify children's anchors and
     // scale.

include/Cubed/ui/main_menu_ui_manager.hpp

@@ -25,7 +25,8 @@ public:
 
 private:
     MainMenuScene& m_scene;
-    std::unordered_map<std::string, std::unique_ptr<Widget>> m_widgets;
+    std::unique_ptr<Widget> m_root_widget;
+    std::unordered_map<std::string, Widget*> m_widgets;
     bool handle_mouse_move_event(const MouseMoveEvent& e);
     bool handle_mouse_button_event(const MouseButtonEvent& e);
     bool handle_window_resize_event(const WindowResizeEvent& e);

include/Cubed/ui/rect.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "Cubed/ui/color.hpp"
+#include "Cubed/ui/widget.hpp"
+namespace Cubed {
+class Rect : public Widget {
+public:
+    Rect(const Rect&) = delete;
+    Rect(Rect&&) = delete;
+    Rect& operator=(const Rect&) = delete;
+    Rect& operator=(Rect&&) = delete;
+    Rect(Widget* parent);
+    ~Rect();
+
+    void update(float dt) override;
+    void render(Renderer& renderer) override;
+
+    float width() const override;
+    float height() const override;
+    float alpha() const;
+
+    Rect& set_width(float width);
+    Rect& set_height(float height);
+
+    Rect& set_fill(bool fill);
+
+    Rect& set_scale(float scale);
+    Rect& set_color(Color color);
+    Rect& set_alpha(float alpha);
+
+    Color color() const;
+
+private:
+    Color m_color = Color::WHITE;
+    float m_width = 0.0f;
+    float m_height = 0.0f;
+    float m_scale = 1.0f;
+    float m_alpha = 1.0f;
+    bool m_fill = false;
+};
+} // namespace Cubed

include/Cubed/ui/widget.hpp

@@ -21,8 +21,8 @@ public:
     virtual Widget& set_offset(glm::ivec2 offset);
     virtual void set_window_size(int width, int height);
     // Returns the final display size
-    virtual float width() const;
-    virtual float height() const;
+    virtual float width() const = 0;
+    virtual float height() const = 0;
     virtual glm::vec2 pos() const;
 
     virtual bool handle_key_event(const KeyEvent& e);