Chapter 6: Example 6-6: No information provided on what's passed in as GLfloat **vtxBuf

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In the example 6-6, signature of DrawPrimitiveWithVBOs() changes from that in example 6-5. The argument GLfloat *vertices is suddenly GLfloat **vtxBuf in example 6-6 .

In example 6-5 the caller of DrawPrimitiveWithVBOs() is clearly shown, passing vertices for the argument GLfloat *vtxBuf. But there is no indication in the book on what is passed in for GLfloat **vtxBuf that's later accessed with vtxBuf[0] and vtxBuf[1]. Passing in the same GLfloat vertices[] will not work in example 6-6.

Having two functions of exact same name with a sudden change of signature and no clear indication could be confusing, especially when reading the text without close inspection of the source code here on github.