I'm getting into OpenGL. I'm following learnopengl.com and I reached the text rendering part, where I read (at the end of In Practice
> Text Rendering
> Shaders
section)
The 2D quad requires 6 vertices of 4 floats each, so we reserve 6 * 4 floats of memory. Because we'll be updating the content of the VBO's memory quite often we'll allocate the memory with GL_DYNAMIC_DRAW.
So far I was thinking of a quad as a pair of triangles, four vertex. How a quad can require 6 vertex?