mirror of
https://github.com/open-goal/jak-project
synced 2026-09-09 20:21:28 -04:00
Tyler Wilding
39 lines
1.3 KiB
Common Lisp
39 lines
1.3 KiB
Common Lisp
;;-*-Lisp-*-
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(in-package goal)
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(bundles "ENGINE.CGO" "GAME.CGO")
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(require "engine/draw/drawable-inline-array-h.gc")
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;; name: draw-node-h.gc
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;; name in dgo: draw-node-h
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;; dgos: GAME, ENGINE
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;; DECOMP BEGINS
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;; A "draw-node" is a way to group together a bunch of drawables (possibly other draw-nodes) in a BVH
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;; This BVH is used for sphere-in-view culling and the broad phase collision detection.
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;; _most_ uses of draw-node are in a special tree with these properties:
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;; - between 1 and 8 roots.
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;; - each child has between 1 and 8 children
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;; - all leaves are stored at the same depth
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;; - all nodes and leaves have visibility IDs
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;; shrub does not have these properties - it supports arbitrary children counts, leaves
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;; may occur at any depth, and nothing has visibility ids.
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(deftype draw-node (drawable)
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((child-count uint8 :offset 6)
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(flags uint8 :offset 7)
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(child drawable :offset 8)
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(distance float :offset 12)))
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;; for non-shrub uses of draw-node, this is used to store all the draw-nodes at a given depth.
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(deftype drawable-inline-array-node (drawable-inline-array)
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((data draw-node 1 :inline)
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(pad uint32)))
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;; the types of these fields are a guess for now.
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;; used for draw-node-cull function
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(deftype draw-node-dma (structure)
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((banka draw-node 32 :inline)
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(bankb draw-node 32 :inline)))
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