Start by setting up two buffers for the particle position and two for the particle velocity. We'll bind them to the GL_SHADER_STORAGE_BUFFER indexed binding point at indices 0 and 1 for the position buffers and 2 and 3 for the velocity buffers. The data layout in these buffers is important. We'll lay out the particle positions/velocities in row-major order starting at the lower left and proceeding to the upper right of the lattice.

We'll also set up a vertex array object for drawing the cloth using the particle positions as triangle vertices. We may also need buffers for normal vectors and texture coordinates. For brevity, I'll omit them from this discussion, but the example code for this book includes them.