libmach: initial API bindings for mach core

src/bindings.zig

@@ -0,0 +1,52 @@
+const std = @import("std");
+const gpu = @import("gpu");
+const Core = @import("Core.zig");
+const libmach = @import("platform/libmach.zig");
+const native = @import("platform/native.zig");
+
+// Current Limitations:
+// 1. Currently, ecs seems to be using some weird compile-time type trickery, so I'm not exactly sure how
+// `engine` should be integrated into the C API
+// 2. Core might need to expose more state so more API functions can be exposed (for example, the WebGPU API)
+// 3. Be very careful about arguments, types, memory, etc - any mismatch will result in undefined behavior
+
+pub const App = libmach;
+
+pub export fn mach_core_set_init(core_init: libmach.CoreCallback) void {
+    std.debug.print("mach core set init\n", .{});
+    libmach.core_callbacks.core_init = core_init;
+}
+
+pub export fn mach_core_set_deinit(core_deinit: libmach.CoreCallback) void {
+    std.debug.print("mach core set deinit\n", .{});
+    libmach.core_callbacks.core_deinit = core_deinit;
+}
+
+pub export fn mach_core_set_update(core_update: libmach.CoreCallback) void {
+    std.debug.print("mach core set update\n", .{});
+    libmach.core_callbacks.core_update = core_update;
+}
+
+pub export fn mach_run() void {
+    if (libmach.core_callbacks.core_init == null) {
+        std.debug.print("Did not provide a core_init callback\n", .{});
+        return;
+    }
+    if (libmach.core_callbacks.core_update == null) {
+        std.debug.print("Did not provide a core_update callback\n", .{});
+        return;
+    }
+    if (libmach.core_callbacks.core_deinit == null) {
+        std.debug.print("Did not provide a core_deinit callback\n", .{});
+        return;
+    }
+    native.main() catch unreachable;
+}
+
+pub export fn core_set_should_close(core: *Core) void {
+    core.*.setShouldClose(true);
+}
+
+pub export fn core_delta_time(core: *Core) f32 {
+    return core.*.delta_time;
+}