Structure layout works in normal mode and semantic mode.

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Structure could defined as input or output of shader.
It also work as an normal structure.
We must be distinguish the states between them.

Following steps are guide:

1. Add semantic_mode in cgllvm_context. It will indicates that expression and 
definition in which mode.

2. Add node-context look up table in cgllvm_vs. It could be used to look up 
semantic_mode storage information.

3. Only structure need to be defined yet.

Original issue reported on code.google.com by wuye9036 on 12 Apr 2011 at 5:06

• Blocked on: #64

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We introduce virtual args and specially return expression to resolve it.

Original comment by wuye9036 on 16 May 2011 at 8:04

• Changed state: Fixed

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Original comment by wuye9036 on 7 Mar 2012 at 2:52

• Added labels: Milestone-M1.1