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. These four are the whole of the supported set. 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.