More TODO code

src/coral/shaders/spirv.zig

@@ -22,7 +22,7 @@ pub const Document = struct {
     }
 
     pub fn op(self: *Document, code: u32) std.mem.Allocator.Error!void {
-        try self.ops.pushGrow(@byteSwap(code));
+        try self.ops.pushGrow(std.mem.nativeToLittle(u32, code));
     }
 
     pub fn opCapability(self: *Document, capability: Capability) std.mem.Allocator.Error!void {
@@ -30,6 +30,15 @@ pub const Document = struct {
         try self.op(@intFromEnum(capability));
     }
 
+    pub fn opEntryPoint(self: *Document, name: []const u8, interfaces: []const u32) std.mem.Allocator.Error!void {
+        try self.op(14);
+        try self.string(name);
+
+        for (interfaces) |interface| {
+            self.op(interface);
+        }
+    }
+
     pub fn opMemoryModel(self: *Document, addressing: AddressingModel, memory: MemoryModel) std.mem.Allocator.Error!void {
         try self.op(14);
         try self.op(@intFromEnum(addressing));
@@ -85,13 +94,14 @@ pub const MemoryModel = enum(u32) {
 
 pub fn generate(spirv: coral.bytes.Writable, root: coral.shaders.Root) (coral.shaders.GenerationError || std.mem.Allocator.Error)!void {
     // TODO: Finish and testing coverage.
-    var document = Document{};
+    var arena = std.heap.ArenaAllocator.init(coral.heap.allocator);
 
-    try document.opCapability(.shader);
+    var module = Module{
+        .capabilities = &.{.shader},
+        .memory_model = .{ .logical, .glsl450 },
+    };
 
-    _ = root;
+    const glsl_std_450 = module.importExtension(&arena, "GLSL.std.450");
-    _ = try document.opExtInstImport("GLSL.std.450");
+    // TODO: specify frag entry point
-
+    const frag = module.entryPoint(.fragment, "main", .{});
-    try document.opMemoryModel(.logical, .glsl450);
-    try document.writeTo(spirv);
 }