In this example, we used two buffers (one for color and one for position). Instead, we could have used just a single buffer and combined all of the data. In general, it is possible to combine the data for multiple attributes into a single buffer. The data for multiple attributes can be interleaved within an array, so that all of the data for a given vertex is grouped together within the buffer. Doing so just requires careful use of the stride argument to glVertexAttribPointer or glBindVertexBuffer. Take a look at the documentation for full details (http://www.opengl.org/sdk/docs/man).
The decision about when to use interleaved arrays and when to use separate arrays is highly dependent on the situation. Interleaved arrays ...
