源码下载及编译

点击此链接进入下载地址
https://download.savannah.gnu.org/releases/freetype/

下载完毕后在windows下找到freetype.sln进行编译(如下图位置)

编译生成的dll及lib

（本项目使用vs2017进行编译）,编译文件生成地址在objs里

使用FreeType

include头文件加载

附加包含目录

注意把freetype的头文件复制到根目录，而不是 放到 "include/freeType"文件夹内部（编译会报错）

lib文件加载

添加lib文件位置

添加lib文件下的lib名

字体使用

选择 C:\Windows\Fonts下的字体文件即可（或网上下载）

代码编写

代码初始化

#include <ft2build.h>
#include FT_FREETYPE_H  FT_Library ft,ft1;
if (FT_Init_FreeType(&ft)) std::cout << "ERROR::FREETYPE: Could not init FreeType Library" << std::endl;
if (FT_Init_FreeType(&ft1)) std::cout << "ERROR::FREETYPE: Could not init FreeType Library" << std::endl;if (FT_New_Face(ft, "Fonts/simsun.ttc", 0, &face)) std::cout << "ERROR::FREETYPE: Failed to load font" << std::endl;
if (FT_New_Face(ft1, "Fonts/simsun.ttc", 0, &face1)) std::cout << "ERROR::FREETYPE: Failed to load font" << std::endl;

中文字体输出简单封装

完整代码 learnOpenGL-CN

void RenderText_CN(Shader &shader, std::wstring text, GLfloat x, GLfloat y, GLfloat scale, glm::vec3 color, GLuint VAO, GLuint VBO, FT_Face face, FT_Library ft)
{shader.use();glUniform3f(glGetUniformLocation(shader.ID, "textColor"), color.x, color.y, color.z);glActiveTexture(GL_TEXTURE0);glBindVertexArray(VAO);for (auto c : text){//if (Characters.find(c) == Characters.end()||1)//{if (FT_Load_Char(face, c, FT_LOAD_RENDER)){std::cerr << "ERROR::FREETYPE: Failed to load Glyph" << std::endl;continue;}GLuint texture;glGenTextures(1, &texture);glBindTexture(GL_TEXTURE_2D, texture);glTexImage2D(GL_TEXTURE_2D,0,GL_RED,face->glyph->bitmap.width,face->glyph->bitmap.rows,0,GL_RED,GL_UNSIGNED_BYTE,face->glyph->bitmap.buffer);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);Character character = {texture,glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),face->glyph->advance.x};//Characters[c] = character;//}Character ch = character;// Characters[c];GLfloat xpos = x + ch.Bearing.x * scale;GLfloat ypos = y - (ch.Size.y - ch.Bearing.y) * scale;GLfloat w = ch.Size.x * scale;GLfloat h = ch.Size.y * scale;GLfloat vertices[6][4] = {{ xpos,     ypos + h,   0.0, 0.0 },{ xpos,     ypos,       0.0, 1.0 },{ xpos + w, ypos,       1.0, 1.0 },{ xpos,     ypos + h,   0.0, 0.0 },{ xpos + w, ypos,       1.0, 1.0 },{ xpos + w, ypos + h,   1.0, 0.0 }};glBindTexture(GL_TEXTURE_2D, ch.TextureID);glBindBuffer(GL_ARRAY_BUFFER, VBO);glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);glBindBuffer(GL_ARRAY_BUFFER, 0);glDrawArrays(GL_TRIANGLES, 0, 6);x += (ch.Advance >> 6) * scale;glDeleteTextures(1, &texture);//openGL gen的必须delete不然会导致软件内存越来越大}glBindVertexArray(0);glBindTexture(GL_TEXTURE_2D, 0);
}

存在问题列表

问题1：无法打开stddef.h

vs2017（win10版本）:
“项目”-“配置属性”-“常规”-"windows SDK版本"选择10.0.17763.0

其他问题后续更新