really basic implementation of rpl types

crates/rpl/src/instructions/mod.rs

@@ -0,0 +1,41 @@
+use serde::{Deserialize, Serialize};
+
+pub mod read;
+pub mod write;
+
+#[derive(Serialize, Deserialize, PartialEq, Eq, Debug)]
+pub enum Instruction {
+    Read(read::Read),
+    Write(write::Write),
+    Math(MathInstruction),
+    Blend(BlendInstruction),
+    Noise(NoiseInstruction),
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Eq, Debug)]
+pub enum MathInstruction {
+    Add,
+    Subtract,
+    Multiply,
+    Divide,
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Eq, Debug)]
+pub enum BlendInstruction {
+    Normal,
+    Multiply,
+    Additive,
+    Overlay,
+    Screen,
+    Subtractive,
+    Difference,
+    Darken,
+    Lighten,
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Eq, Debug)]
+pub enum NoiseInstruction {
+    Perlin,
+    Simplex,
+    Voronoi,
+}