64 lines
2.6 KiB
C#
64 lines
2.6 KiB
C#
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using System;
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namespace UnityEditor.ShaderGraph.Internal
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{
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// ------------------------------------------------------------------------------------------
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//
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// The general use of precision follows this data flow
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//
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// Precision -- user selectable precision setting on each node
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// == apply precision inherit rules based on node inputs ==>
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// GraphPrecision -- where "GraphPrecision.Graph" means use the graph default setting
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// == fallback to graph defaults ==>
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// GraphPrecision -- where "GraphPrecision.Graph" means it is switchable when in a subgraph
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// == shadergraph concretization ==>
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// ConcretePrecision -- the actual precision used by the node, half or single
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//
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// We could at some point separate the two GraphPrecision uses into separate enums,
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// but they're close enough we're using one enum for both uses at the moment
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//
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// ------------------------------------------------------------------------------------------
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// this is generally used for user-selectable precision
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[Serializable]
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enum Precision
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{
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Inherit, // automatically choose the precision based on the inputs
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Single, // force single precision (float)
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Half, // force half precision
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Graph, // use the graph default (for subgraphs this will properly switch based on the subgraph node setting)
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}
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// this is used when calculating precision within a graph
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// it basically represents the precision after applying the automatic inheritance rules
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// but before applying the fallback to the graph default
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// tracking this explicitly helps us build subgraph switchable precision behavior (any node using Graph can be switched)
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public enum GraphPrecision
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{
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Single = 0, // the ordering is different here so we can use the min function to resolve inherit/automatic behavior
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Graph = 1,
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Half = 2
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}
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// this is the actual set of precisions we have, a shadergraph must resolve every node to one of these
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// in subgraphs, this concrete precision is only used for preview, and may not represent the actual precision of those nodes
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// when used in a shader graph
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[Serializable]
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public enum ConcretePrecision
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{
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Single,
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Half,
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}
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// inherit(auto) rules for combining input types
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// half + half ==> half
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// single + single ==> single
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// single + half ==> single
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// single + graph ==> single
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// half + graph ==> graph
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// single + half + graph ==> single
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//
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// basically: take the min when arranged like so: single(0), graph(1), half(2)
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}
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