libmach: initial API bindings for mach core

src/platform/libmach.zig

@@ -0,0 +1,35 @@
+const std = @import("std");
+const Core = @import("../Core.zig");
+const gpu = @import("gpu");
+const ecs = @import("ecs");
+
+pub const App = @This();
+
+// Zig says that *App has a size of 0 bits, and it won't compile if
+// pub const core_callback_t = fn (*App, *Core) callconv(.C) void;
+// What is *App needed for anyway?
+pub const CoreCallback = fn (*Core) callconv(.C) void;
+
+pub const CoreCallbacks = struct {
+    core_init: ?CoreCallback,
+    core_update: ?CoreCallback,
+    core_deinit: ?CoreCallback,
+};
+
+pub var core_callbacks = CoreCallbacks {
+    .core_init = null,
+    .core_update = null,
+    .core_deinit = null,
+};
+
+pub fn init(_: *App, core: *Core) !void {
+    core_callbacks.core_init.?(core);
+}
+
+pub fn deinit(_: *App, core: *Core) void {
+    core_callbacks.core_deinit.?(core);
+}
+
+pub fn update(_: *App, core: *Core) !void {
+    core_callbacks.core_update.?(core);
+}