Blender-like texture unit pipeline

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Implementation milestones:
1. Make sure the texture unit information is properly exported and stored 
somewhere in the material.
2. Implement a universal deferred renderer for tex-unit application.
3. Compose these new renders into a separate group as an alternative to render 
techniques.

Achievement benefits:
1. More identical to Blender model gives better control.
2. Gives more features (decals, different blend modes, etc).
3. Better deferred shading model.

Original issue reported on code.google.com by kvarkus on 11 May 2011 at 1:26

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Layered deferred pipeline has been implemented as an extension module. In 
addition to given benefits, a uni-space parallax effect has been added as an 
option.

Original comment by kvarkus on 16 Jun 2011 at 5:45

• Changed state: Done
• Added labels: ****
• Removed labels: ****