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This fixes https://bugs.freedesktop.org/show_bug.cgi?id=33247
There might still be some issues with drawing multiple instances
with VBO splitting to investigate someday.
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Fixes a VTK regression after adding GL_ARB_draw_instanced.
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The in-place splitting code wasn't dealing with index buffers at all
(and it was being called from vbo_split_prims for too big index
buffers, causing some occasional corruption).
Additionally, it wasn't taking into account primitives arrays with
non-contiguous indices (e.g. given prim[0].start = 0 and prim[1].start
= max_verts, it would happily call back the driver with (max_index -
min_index) still greater than max_verts, causing infinite recursion).
It still doesn't handle too large indexed vertex buffers: use
vbo_split_copy for that.
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This saves mapping the index buffer to get a bounds on the indices that
drivers just drop on the floor in the VBO case (cache win), saves a bonus
walk of the indices in the CheckArrayBounds case, and other miscellaneous
validation. On intel it's a particularly a large win (50-100% in my app)
because even though we let the indices stay in both CPU and GPU caches, we
still end up waiting for the GPU to be done with the buffer before reading
from it.
Drivers that want the min/max_index fields must now check index_bounds_valid
and use vbo_get_minmax_index before using them.
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Since shared array objects may point to the null/default buffer object,
the null/default buffer object should be part of the shared state.
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of -I flags.
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