OpenGL图像加载方式

OpenGL加载图像常用几种方式

OpenCV方式

    //create texture
    cv::Mat image = cv::imread("awesomeface.png",cv::IMREAD_COLOR);
    GLuint texture;
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);

    cv::Mat fp;
    cv::cvtColor(image,fp,cv::COLOR_BGRA2RGBA);
    glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,fp.cols,fp.rows,0, GL_RGBA, GL_UNSIGNED_BYTE, fp.data);
    glGenerateMipmap(GL_TEXTURE_2D);

SOIL2方式

int width, height;
unsigned char* image = SOIL_load_image("awesomeface.png", &width, &height, 0, SOIL_LOAD_RGBA);			// 获取图片
	/* 生成纹理 */
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);			// 读取图片信息
glGenerateMipmap(GL_TEXTURE_2D);	// 多层渐进纹理
SOIL_free_image_data(image);

stb方式

    int width, height, nrChannels;
    unsigned char *data = stbi_load("awesomeface.png", &width, &height, &nrChannels, 0);

    GLuint texture;
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);

    glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,width,height,0, GL_RGBA, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
    stbi_image_free(data);

总结

类型	使用感受
OpenCV	CV过于庞大，不推荐
SOIL2	功能很强大
stb	推荐，只有头文件。精简好用