Add full source code of the finished (and revised code) Breakout example. Not set up for cross-platform compilation as it has irrKlang and FreeType dependency, but at least source code is available online (and can be referenced from Breakout chapters).

src/7.in_practice/3.2d_game/0.full_source/text_renderer.h

@@ -0,0 +1,51 @@
+/*******************************************************************
+** This code is part of Breakout.
+**
+** Breakout is free software: you can redistribute it and/or modify
+** it under the terms of the CC BY 4.0 license as published by
+** Creative Commons, either version 4 of the License, or (at your
+** option) any later version.
+******************************************************************/
+#ifndef TEXT_RENDERER_H
+#define TEXT_RENDERER_H
+
+#include <map>
+
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+
+#include "texture.h"
+#include "shader.h"
+
+
+/// Holds all state information relevant to a character as loaded using FreeType
+struct Character {
+    unsigned int TextureID; // ID handle of the glyph texture
+    glm::ivec2   Size;      // size of glyph
+    glm::ivec2   Bearing;   // offset from baseline to left/top of glyph
+    unsigned int Advance;   // horizontal offset to advance to next glyph
+};
+
+
+// A renderer class for rendering text displayed by a font loaded using the 
+// FreeType library. A single font is loaded, processed into a list of Character
+// items for later rendering.
+class TextRenderer
+{
+public:
+    // holds a list of pre-compiled Characters
+    std::map<char, Character> Characters; 
+    // shader used for text rendering
+    Shader TextShader;
+    // constructor
+    TextRenderer(unsigned int width, unsigned int height);
+    // pre-compiles a list of characters from the given font
+    void Load(std::string font, unsigned int fontSize);
+    // renders a string of text using the precompiled list of characters
+    void RenderText(std::string text, float x, float y, float scale, glm::vec3 color = glm::vec3(1.0f));
+private:
+    // render state
+    unsigned int VAO, VBO;
+};
+
+#endif