Shaders: add BufferStruct to support bool and enums (#3109)

* node-macro: modernize `node` macro

* node-macro: add `CrateIdent` struct containing resolved crate paths

* shaders: add trait `BufferStruct` and derive macro

* shaders: `gamma_correction` and `channel_mixer` gpu nodes

* shaders: `selective_color` gpu node

* shaders: `brightness_contrast_classic` gpu node

* shaders: append GPU to display name

* node-macro: fixup doc links

* shaders: consistently append " GPU" to all shader node names

Cargo.lock

@@ -2137,10 +2137,13 @@ dependencies = [
  "graphene-core",
  "half",
  "log",
+ "node-macro",
  "num-derive",
  "num-traits",
+ "num_enum",
  "serde",
  "specta",
+ "spirv-std",
 ]
 
 [[package]]
@@ -2186,6 +2189,7 @@ dependencies = [
  "ndarray",
  "node-macro",
  "num-traits",
+ "num_enum",
  "rand 0.9.2",
  "rand_chacha 0.9.0",
  "serde",
@@ -3470,6 +3474,7 @@ version = "0.0.0"
 dependencies = [
  "convert_case 0.8.0",
  "graphene-core",
+ "graphene-core-shaders",
  "indoc",
  "proc-macro-crate",
  "proc-macro-error2",
@@ -5524,6 +5529,7 @@ version = "0.9.0"
 source = "git+https://github.com/rust-gpu/rust-gpu?rev=c12f216121820580731440ee79ebc7403d6ea04f#c12f216121820580731440ee79ebc7403d6ea04f"
 dependencies = [
  "bitflags 1.3.2",
+ "bytemuck",
  "glam",
  "libm",
  "num-traits",