Working FontManager and Label implementation (WIP)

include/graphic_context.hpp

@@ -7,6 +7,7 @@
 
 #define GLM_FORCE_RADIANS
 #define GLM_FORCE_DEPTH_ZERO_TO_ONE
-#include <glm/vec4.hpp>
-#include <glm/mat4x4.hpp>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
 // clang-format off

include/uui/opengl/application.hpp

@@ -6,6 +6,7 @@
 #include <vector>
 
 #include "graphic_context.hpp"
+#include "uui/opengl/font_manager.hpp"
 
 namespace uui
 {
@@ -33,11 +34,13 @@ private:
 	static GlApplication* application_pointer;
 };
 
+class GlLabel;
 class GlComponent;
 class GlWindow
 {
 	friend class GlApplication;
 	friend class GlComponent;
+	friend class GlLabel;
 
 public:
 	std::string title;
@@ -50,14 +53,21 @@ public:
 	std::shared_ptr<GlComponent> create_component(
 		 const std::variant<int, float> x, const std::variant<int, float> y, const std::variant<int, float> width,
 		 const std::variant<int, float> height);
+	std::shared_ptr<GlLabel> create_label(
+		 const std::variant<int, float> x, const std::variant<int, float> y, const std::string& text,
+		 const std::tuple<float, float, float, float>& text_color);
 
-private:
+protected:
 	GlApplication* app;
 
+	GlFontManager font_manager;
+
 	int width;
 	int height;
 	bool need_resize_refresh;
 
+	bool iconified;
+
 	size_t index;
 	bool initialized;
 
@@ -72,6 +82,8 @@ private:
 	void draw();
 
 	static void glfw_resize_callback(GLFWwindow* window, int width, int height);
+	static void glfw_iconify_callback(GLFWwindow* window, int iconified);
+	static void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
 };
 
 } // namespace uui

include/uui/opengl/component.hpp

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <array>
-// #include <memory>
+#include <memory>
 #include <variant>
 
 #include "graphic_context.hpp"
@@ -20,7 +20,7 @@ public:
 
 	void set_background_color(float r, float g, float b, float a = 0.0f);
 
-private:
+protected:
 	std::shared_ptr<GlWindow> window;
 
 	std::variant<int, float> position_x;
@@ -41,11 +41,11 @@ private:
 		 std::shared_ptr<GlWindow> window, const std::variant<int, float> x, const std::variant<int, float> y,
 		 const std::variant<int, float> width, const std::variant<int, float> height);
 
-	void init();
-	void set_vbo_data();
-	void deinit();
-	void render();
-	void on_resize();
+	virtual void init();
+	virtual void set_vbo_data();
+	virtual void deinit();
+	virtual void render();
+	virtual void on_resize();
 };
 
 } // namespace uui

include/uui/opengl/font_manager.hpp

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <array>
+#include <string>
+#include <tuple>
+#include <vector>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include "graphic_context.hpp"
+
+namespace uui
+{
+class GlWindow;
+class GlFontManager
+{
+	friend class GlWindow;
+
+public:
+	struct character_info
+	{
+		float advance_x; // advance.x
+		float advance_y; // advance.y
+
+		float bitmap_width; // bitmap.width;
+		float bitmap_height; // bitmap.rows;
+
+		float bitmap_left; // bitmap_left;
+		float bitmap_top; // bitmap_top;
+
+		float texture_x; // x offset of glyph in texture coordinates
+		float texture_y; // y offset of glyph in texture coordinates
+	};
+
+	struct Font
+	{
+		character_info char_infos[256];
+		GLuint tex;
+		unsigned int atlas_width;
+		unsigned int atlas_height;
+	};
+
+	std::vector<Font> fonts;
+
+	GlFontManager();
+	~GlFontManager();
+
+	void render_text(
+		 const std::string& text, Font& font, float x, float y, float scale_x, float scale_y,
+		 const std::tuple<float, float, float, float>& text_color);
+	std::tuple<int, int> get_text_size(const std::string& text, Font& font, float scale_x, float scale_y);
+
+private:
+	static constexpr int MAX_WIDTH = 1024;
+
+	bool initialized;
+
+	FT_Library ft;
+
+	GLuint gl_program;
+	GLuint gl_vao;
+	GLuint gl_vbo;
+
+	void init();
+	void deinit();
+	const Font& init_font(const std::string& font_path, size_t font_size);
+};
+} // namespace uui

include/uui/opengl/label.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+#include <tuple>
+
+#include "uui/opengl/component.hpp"
+
+namespace uui
+{
+class GlLabel: public GlComponent
+{
+	friend class GlWindow;
+
+	size_t font_index;
+
+	float get_width() const;
+	float get_height() const;
+
+protected:
+	std::string text;
+	const std::tuple<float, float, float, float>& text_color;
+
+	int text_width;
+	int text_height;
+
+	GlLabel(
+		 std::shared_ptr<GlWindow> window, const std::variant<int, float> x, const std::variant<int, float> y, const std::string& text,
+		 const std::tuple<float, float, float, float>& text_color);
+
+	void render();
+};
+
+} // namespace uui