examples: revert to 0.4 entrypoint / control API design

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

examples/custom-renderer/App.zig

@@ -1,4 +1,3 @@
-const std = @import("std");
 const mach = @import("mach");
 const math = mach.math;
 const Renderer = @import("Renderer.zig");
@@ -25,7 +24,7 @@ pub const components = .{
 pub const systems = .{
     .init = .{ .handler = init },
     .deinit = .{ .handler = deinit },
-    .update = .{ .handler = update },
+    .tick = .{ .handler = tick },
 };
 
 // Define the globally unique name of our module. You can use any name here, but keep in mind no
@@ -38,8 +37,9 @@ pub const name = .app;
 // Note that Mod.state() returns an instance of our module struct.
 pub const Mod = mach.Mod(@This());
 
-pub fn deinit(renderer: *Renderer.Mod) void {
+pub fn deinit(core: *mach.Core.Mod, renderer: *Renderer.Mod) void {
     renderer.schedule(.deinit);
+    core.schedule(.deinit);
 }
 
 fn init(
@@ -47,9 +47,11 @@ fn init(
     // of the program we can have these types injected here, letting us work with other modules in
     // our program seamlessly and with a type-safe API:
     entities: *mach.Entities.Mod,
+    core: *mach.Core.Mod,
     renderer: *Renderer.Mod,
     game: *Mod,
 ) !void {
+    core.schedule(.init);
     renderer.schedule(.init);
 
     // Create our player entity.
@@ -73,16 +75,16 @@ fn init(
         .spawn_timer = try mach.Timer.start(),
         .player = player,
     });
+
+    core.schedule(.start);
 }
 
-fn update(
+fn tick(
     entities: *mach.Entities.Mod,
     core: *mach.Core.Mod,
     renderer: *Renderer.Mod,
     game: *Mod,
 ) !void {
-    // TODO(important): event polling should occur in mach.Core module and get fired as ECS event.
-    // TODO(Core)
     var iter = core.state().pollEvents();
     var direction = game.state().direction;
     var spawning = game.state().spawning;

examples/custom-renderer/Renderer.zig

@@ -1,7 +1,3 @@
-// TODO(important): docs
-// TODO(important): review all code in this file in-depth
-const std = @import("std");
-
 const mach = @import("mach");
 const gpu = mach.gpu;
 const math = mach.math;
@@ -110,7 +106,9 @@ fn init(
     });
 }
 
-fn deinit(renderer: *Mod) !void {
+fn deinit(
+    renderer: *Mod,
+) !void {
     renderer.state().pipeline.release();
     for (renderer.state().bind_groups) |bind_group| bind_group.release();
     renderer.state().uniform_buffer.release();
@@ -127,7 +125,7 @@ fn renderFrame(
     defer back_buffer_view.release();
 
     // Create a command encoder
-    const label = @tagName(name) ++ ".renderFrame";
+    const label = @tagName(name) ++ ".tick";
     const encoder = core.state().device.createCommandEncoder(&.{ .label = label });
     defer encoder.release();
 
@@ -177,5 +175,6 @@ fn renderFrame(
     defer command.release();
     core.state().queue.submit(&[_]*gpu.CommandBuffer{command});
 
+    // Present the frame
     core.schedule(.present_frame);
 }

examples/custom-renderer/main.zig

@@ -1,5 +1,3 @@
-const std = @import("std");
-
 const mach = @import("mach");
 
 // The global list of Mach modules registered for use in our application.
@@ -9,8 +7,9 @@ pub const modules = .{
     @import("Renderer.zig"),
 };
 
+// TODO: move this to a mach "entrypoint" zig module
 pub fn main() !void {
-    // Initialize mach.Core
+    // Initialize mach core
     try mach.core.initModule();
 
     // Main loop