The first code segment defines a simple function that loads the texture from a file, copies the texture data to OpenGL memory, and sets up the mag and min filters. It returns the texture ID. The first step, loading the texture image file, is accomplished by calling another method (Texture::loadPixels), which uses an image loader that is provided along with the example code. The loader comes from a header file stb_image.h, available on GitHub (https://github.com/nothings/stb). It reads the image and stores the pixel data into an array of unsigned bytes in RGBA order. The width and height of the image are returned via the last two parameters. We keep a pointer to the image data, simply named data.
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