Commits on Nov 14, 2018

1. Reduce need for full world rect calculation for primitives. …

   The fewer places that rely on a full world rect, the easier it
   is to do clustered culling, where we accept / reject primitives
   in groups.
   
   The main use for world rects of primitivs is overlap calculations
   during batching. Instead, switch to use the surface relative rect
   for batching. This is safe since we know that when we merge batches
   from different surfaces, they will never be overlapping in the
   allocated render target.
   
   Other changes:
    * Refactor the initial picture traversal to use a state object
      that maintains an internal stack of picture / surface info.
      This is easier to reason about, and will be helpful once we
      start using this to pass information about caching state.
    * Use world rect rather than clipped prim world rect for bounds
      during plane-splitting. This was landed previously but
      backed out due to an unrelated bug in that patch.
    * Change get_raster_rects to not calculate the transform, since
      most uses of this method don't require it.
    * Change conservative tiling calculations to use the world rect
      for bounds instead of clipped prim rect. All we're trying to
      do here is reject tiles outside the viewport, so this simplifies
      the code and removes the need for the primitive world rect in
      one more location.

   

   gw3583 committed Nov 14, 2018

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