initial mask impl

src/render/data.rs

@@ -1,6 +1,5 @@
-use wgpu::VertexAttribute;
-
-use crate::layout::UiRegion;
+use crate::{layout::UiRegion, util::Id};
+use wgpu::*;
 
 #[repr(C)]
 #[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable, Default)]
@@ -15,23 +14,37 @@ pub struct PrimitiveInstance {
     pub region: UiRegion,
     pub binding: u32,
     pub idx: u32,
+    pub mask_idx: MaskIdx,
 }
 
 impl PrimitiveInstance {
-    const ATTRIBS: [VertexAttribute; 6] = wgpu::vertex_attr_array![
+    const ATTRIBS: [VertexAttribute; 7] = vertex_attr_array![
         0 => Float32x2,
         1 => Float32x2,
         2 => Float32x2,
         3 => Float32x2,
         4 => Uint32,
         5 => Uint32,
+        6 => Uint32,
     ];
 
-    pub fn desc() -> wgpu::VertexBufferLayout<'static> {
-        wgpu::VertexBufferLayout {
-            array_stride: std::mem::size_of::<Self>() as wgpu::BufferAddress,
-            step_mode: wgpu::VertexStepMode::Instance,
+    pub fn desc() -> VertexBufferLayout<'static> {
+        VertexBufferLayout {
+            array_stride: std::mem::size_of::<Self>() as BufferAddress,
+            step_mode: VertexStepMode::Instance,
             attributes: &Self::ATTRIBS,
         }
     }
 }
+
+pub type MaskIdx = Id<u32>;
+
+impl MaskIdx {
+    pub const NONE: Self = Self::preset(u32::MAX);
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct Mask {
+    pub region: UiRegion,
+}