WIP graster-nodes: change Color params to Option<Color>

node-graph/gcore-shaders/src/shaders/buffer_struct/graphite.rs

@@ -0,0 +1,29 @@
+//! custom BufferStruct impl for graphite
+
+use crate::color::Color;
+use crate::shaders::buffer_struct::BufferStruct;
+use bytemuck::{Pod, Zeroable};
+
+#[repr(C)]
+#[derive(Copy, Clone, Zeroable, Pod)]
+pub struct OptionalColorBuffer(u32, <Color as BufferStruct>::Buffer);
+
+unsafe impl BufferStruct for Option<Color> {
+	type Buffer = OptionalColorBuffer;
+
+	#[inline]
+	fn write(from: Self) -> Self::Buffer {
+		match from {
+			None => OptionalColorBuffer(0, Color::write(Color::default())),
+			Some(t) => OptionalColorBuffer(1, Color::write(t)),
+		}
+	}
+
+	#[inline]
+	fn read(from: Self::Buffer) -> Self {
+		match from.0 {
+			1 => Some(Color::read(from.1)),
+			_ => None,
+		}
+	}
+}

node-graph/gcore-shaders/src/shaders/buffer_struct/mod.rs

@@ -6,6 +6,7 @@
 use bytemuck::Pod;
 
 mod glam;
+mod graphite;
 mod primitive;
 
 /// A BufferStruct is a "parallel representation" of the original struct with some fundamental types remapped. This