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