[Bug 102678] gl_BaseVertex should always be zero when the draw command has no <basevertex> parameter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102678

--- Comment #5 from Ian Romanick <idr at freedesktop.org> ---
glDrawArrays behaves as if you did

    unsigned indices[count];

    for (i = 0; i < count; i++)
        indices[i] = first + count;

    glDrawElements(mode, count, GL_UNSIGNED_INT, indices);

The language in the spec is a bit more complicated than that, IIRC, but it
should be equivalent.  I think gl_BaseVertex=0 and gl_VertexID=first+i is
consistent with that.

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