86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
#ifndef FONT_CLASS
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#define FONT_CLASS
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include <map>
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#include <iostream>
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#include <glm/glm.hpp>
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#include "VAO.h"
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#include "VBO.h"
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struct TextCharacter {
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unsigned int TextureID;
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glm::ivec2 Size;
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glm::ivec2 Bearing;
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unsigned int Advance;
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};
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class Font {
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public:
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VAO vao;
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VBO vbo;
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std::map<char, TextCharacter> Characters;
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Font(const char* directory) {
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// Correct order: bind VAO first, then VBO
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vao.GenerateID(); // ADD
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vbo.GenerateID(); // ADD
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vao.Bind();
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vbo.Bind();
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
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vbo.Unbind();
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vao.Unbind();
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FT_Library ft;
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if (FT_Init_FreeType(&ft)) {
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std::cout << "ERROR::FREETYPE: Could not init FreeType Library\n";
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throw std::runtime_error("FreeType init failed");
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}
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FT_Face face;
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if (FT_New_Face(ft, directory, 0, &face)) {
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std::cout << "ERROR::FREETYPE: Failed to load font\n";
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FT_Done_FreeType(ft);
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throw std::runtime_error("Font load failed");
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}
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FT_Set_Pixel_Sizes(face, 0, 48);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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for (unsigned char c = 0; c < 128; c++) {
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if (FT_Load_Char(face, c, FT_LOAD_RENDER)) {
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std::cout << "ERROR::FREETYPE: Failed to load Glyph " << c << "\n";
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continue;
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}
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unsigned int texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RED,
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face->glyph->bitmap.width,
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face->glyph->bitmap.rows,
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0, GL_RED, GL_UNSIGNED_BYTE,
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face->glyph->bitmap.buffer
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);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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Characters[c] = {
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texture,
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glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
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glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
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(unsigned int)face->glyph->advance.x
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};
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}
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FT_Done_Face(face);
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FT_Done_FreeType(ft);
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}
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};
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#endif |