Question

I am using glGenBuffers,which creates a handle/s that is used to refer to the buffer when talking to gl.Can I use the handle to read the content of the buffer/s?
If yes – how?

Answer 1

There are two ways to read data from a Buffer Object. There is glGetBufferSubData, which directly copies buffer data into a pointer of your choice.

You can also map the buffer for reading. That requires using glMapBufferRange (or glMapBuffer if you’re old-school), which you can use to get a pointer to the buffer objects data and read directly.