Restructure GPU compilation execution pipeline (#903)

* Restructure gpu compilation execution pipeline

* Add compilation server/client infrastructure

* Add wgpu executor

node-graph/gpu-compiler/src/templates/Cargo-template.toml

@@ -0,0 +1,17 @@
+[package]
+name = "{{name}}-node"
+version = "0.1.0"
+authors = [{%for author in authors%}"{{author}}", {%endfor%}]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+publish = false
+
+[lib]
+crate-type = ["dylib", "lib"]
+
+[patch.crates-io]
+libm = { git = "https://github.com/rust-lang/libm", tag = "0.2.5" }
+
+[dependencies]
+spirv-std = { git = "https://github.com/EmbarkStudios/rust-gpu" , features= ["glam"]}
+graphene-core = {path = "{{gcore_path}}", default-features = false, features = ["gpu"]}

node-graph/gpu-compiler/src/templates/rust-toolchain

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2022-10-29"
+components = ["rust-src", "rustc-dev", "llvm-tools-preview", "clippy", "cargofmt", "rustc"]

node-graph/gpu-compiler/src/templates/spirv-template.rs

@@ -0,0 +1,38 @@
+#![no_std]
+#![feature(unchecked_math)]
+#![deny(warnings)]
+
+#[cfg(target_arch = "spirv")]
+extern crate spirv_std;
+
+#[cfg(target_arch = "spirv")]
+pub mod gpu {
+    use super::*;
+    use spirv_std::spirv;
+    use spirv_std::glam::UVec3;
+
+    #[allow(unused)]
+    #[spirv(compute(threads({{compute_threads}})))]
+    pub fn eval (
+        #[spirv(global_invocation_id)] global_id: UVec3,
+        #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] a: &[{{input_type}}],
+        #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] y: &mut [{{output_type}}],
+        #[spirv(push_constant)] push_consts: &graphene_core::gpu::PushConstants,
+    ) {
+        let gid = global_id.x as usize;
+        // Only process up to n, which is the length of the buffers.
+        if global_id.x < push_consts.n {
+            y[gid] = node_graph(a[gid]);
+        }
+    }
+
+    fn node_graph(input: {{input_type}}) -> {{output_type}} {
+        use graphene_core::Node;
+
+        {% for node in nodes %}
+        let {{node.id}} = {{node.fqn}}::new({% for arg in node.args %}{{arg}}, {% endfor %});
+        {% endfor %}
+		{{last_node}}.eval(input)
+    }
+
+}