moved around the file heirarchy to make these handles safer

src/canvas/managed/mod.rs

@@ -0,0 +1,40 @@
+
+pub mod shader;
+pub mod handles;
+pub mod canvas_text;
+pub mod gpu_buffers;
+
+use vulkano::pipeline::shader::{SpecializationConstants, SpecializationMapEntry};
+
+#[repr(C)]
+#[derive(Default, Debug, Clone)]
+/// Specialization constants which can be passed to the shader. Pretty much placeholder ATM
+struct ShaderSpecializationConstants {
+    first_constant: i32,
+    second_constant: u32,
+    third_constant: f32,
+}
+
+unsafe impl SpecializationConstants for ShaderSpecializationConstants {
+    fn descriptors() -> &'static [SpecializationMapEntry] {
+        static DESCRIPTORS: [SpecializationMapEntry; 3] = [
+            SpecializationMapEntry {
+                constant_id: 0,
+                offset: 0,
+                size: 4,
+            },
+            SpecializationMapEntry {
+                constant_id: 1,
+                offset: 4,
+                size: 4,
+            },
+            SpecializationMapEntry {
+                constant_id: 2,
+                offset: 8,
+                size: 4,
+            },
+        ];
+
+        &DESCRIPTORS
+    }
+}