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use super::InternedRenderLabel;
/// An edge, which connects two [`Nodes`](super::Node) in
/// a [`RenderGraph`](crate::render_graph::RenderGraph).
///
/// They are used to describe the ordering (which node has to run first)
/// and may be of two kinds: [`NodeEdge`](Self::NodeEdge) and [`SlotEdge`](Self::SlotEdge).
///
/// Edges are added via the [`RenderGraph::add_node_edge`] and the
/// [`RenderGraph::add_slot_edge`] methods.
///
/// The former simply states that the `output_node` has to be run before the `input_node`,
/// while the later connects an output slot of the `output_node`
/// with an input slot of the `input_node` to pass additional data along.
/// For more information see [`SlotType`](super::SlotType).
///
/// [`RenderGraph::add_node_edge`]: crate::render_graph::RenderGraph::add_node_edge
/// [`RenderGraph::add_slot_edge`]: crate::render_graph::RenderGraph::add_slot_edge
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Edge {
/// An edge describing to ordering of both nodes (`output_node` before `input_node`)
/// and connecting the output slot at the `output_index` of the `output_node`
/// with the slot at the `input_index` of the `input_node`.
SlotEdge {
input_node: InternedRenderLabel,
input_index: usize,
output_node: InternedRenderLabel,
output_index: usize,
},
/// An edge describing to ordering of both nodes (`output_node` before `input_node`).
NodeEdge {
input_node: InternedRenderLabel,
output_node: InternedRenderLabel,
},
}
impl Edge {
/// Returns the id of the `input_node`.
pub fn get_input_node(&self) -> InternedRenderLabel {
match self {
Edge::SlotEdge { input_node, .. } | Edge::NodeEdge { input_node, .. } => *input_node,
}
}
/// Returns the id of the `output_node`.
pub fn get_output_node(&self) -> InternedRenderLabel {
match self {
Edge::SlotEdge { output_node, .. } | Edge::NodeEdge { output_node, .. } => *output_node,
}
}
}
#[derive(PartialEq, Eq)]
pub enum EdgeExistence {
Exists,
DoesNotExist,
}