Built-In Node Catalogue#

Nodes that ship with SPG, usable with no GPU source and no launch script. Author them with info:implementationSource = "id" and one of the info:id values listed here. An ID outside this table may still resolve, and is not an authoring surface you can rely on.

Available Nodes#

`info:id`	Inputs	Output	Operation
`spg:rtx.spg.stdlib/Add`	`A`, `B` (opaque)	`Result`	Element-wise addition. uint8: saturating (`min(a+b, 255)`).
`spg:rtx.spg.stdlib/Multiply`	`A`, `B` (opaque)	`Result`	Element-wise multiplication. uint8: normalized (`(a*b)/255`).
`spg:rtx.spg.stdlib/Scale`	`Input` (opaque), `scaleX` (float, default 0.5), `scaleY` (float, default 0.5)	`Output`	Nearest-neighbor resize. Output: `widthscaleX` x `heightscaleY`, min 1px.
`spg:rtx.spg.stdlib/Swizzle`	`Input` (opaque), `swizzle` (token, default `"xyzw"`)	`Output`	Per-channel routing.

Binary nodes (Add, Multiply) require both inputs to have the same dimensions and format. Scale is the only node whose output dimensions differ from its input.

Swizzle selectors: x y z w select source channels 0-3. 0 inserts zero. 1 inserts one (1.0 for float, 255 for uint8). Case-insensitive. String length must equal the input channel count.

Standard library nodes operate on 2D textures only. Integer texture formats (SINT, UINT) and buffer-backed resources are not supported.