Jacob Segal b234baee2c Add lazy evaluation and dynamic node expansion ... This PR inverts the execution model -- from recursively calling nodes to using a topological sort of the nodes. This change allows for modification of the node graph during execution. This allows for two major advantages: 1. The implementation of lazy evaluation in nodes. For example, if a "Mix Images" node has a mix factor of exactly 0.0, the second image input doesn't even need to be evaluated (and visa-versa if the mix factor is 1.0). 2. Dynamic expansion of nodes. This allows for the creation of dynamic "node groups". Specifically, custom nodes can return subgraphs that replace the original node in the graph. This is an *incredibly* powerful concept. Using this functionality, it was easy to implement: a. Components (a.k.a. node groups) b. Flow control (i.e. while loops) via tail recursion c. All-in-one nodes that replicate the WebUI functionality d. and more All of those were able to be implemented entirely via custom nodes without hooking or replacing any core functionality. Within this PR, I've included all of these proof-of-concepts within a custom node pack. In reality, I would expect some number of them to be merged into the core node set (with the rest left to be implemented by custom nodes). I made very few changes to the front-end, so there are probably some easy UX wins for someone who is more willing to wade into .js land. The user experience is a lot better than I expected though -- progress shows correctly in the UI over the nodes that are being expanded.		2023-07-18 20:08:12 -07:00
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inversion-demo-components.js	Add lazy evaluation and dynamic node expansion	2023-07-18 20:08:12 -07:00