examples: Do not return bool on update()

Also replaced all ``return false;`` usages with Engine.setShouldClose(true).

examples/advanced-gen-texture-light/main.zig

@@ -54,7 +54,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.depth.?.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| switch (ev.key) {
@@ -172,8 +172,6 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
 
     app.queue.submit(&.{command});
     engine.swap_chain.?.present();
-
-    return true;
 }
 
 pub fn resize(app: *App, engine: *mach.Engine, width: u32, height: u32) !void {

examples/boids/main.zig

@@ -157,7 +157,7 @@ pub fn init(app: *App, engine: *mach.Engine) !void {
 
 pub fn deinit(_: *App, _: *mach.Engine) void {}
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     const back_buffer_view = engine.swap_chain.?.getCurrentTextureView();
     const color_attachment = gpu.RenderPassColorAttachment{
         .view = back_buffer_view,
@@ -205,6 +205,4 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
 
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }

examples/fractal-cube/main.zig

@@ -220,7 +220,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.depth_texture_view.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -321,8 +321,6 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }
 
 pub fn resize(app: *App, engine: *mach.Engine, width: u32, height: u32) !void {

examples/gkurve/main.zig

@@ -248,7 +248,7 @@ pub fn deinit(app: *App, engine: *mach.Engine) void {
     app.texture_atlas_data.deinit(engine.allocator);
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -303,8 +303,6 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }
 
 pub fn resize(app: *App, _: *mach.Engine, _: u32, _: u32) !void {

examples/instanced-cube/main.zig

@@ -139,7 +139,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.uniform_buffer.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -209,6 +209,4 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }

examples/rotating-cube/main.zig

@@ -147,7 +147,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.bind_group.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -209,6 +209,4 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }

examples/textured-cube/main.zig

@@ -177,7 +177,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.depth_texture_view.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -243,8 +243,6 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }
 
 pub fn resize(app: *App, engine: *mach.Engine, width: u32, height: u32) !void {

examples/triangle/main.zig

@@ -73,7 +73,7 @@ pub fn init(app: *App, engine: *mach.Engine) !void {
 
 pub fn deinit(_: *App, _: *mach.Engine) void {}
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     const back_buffer_view = engine.swap_chain.?.getCurrentTextureView();
     const color_attachment = gpu.RenderPassColorAttachment{
         .view = back_buffer_view,
@@ -101,6 +101,4 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }

examples/two-cubes/main.zig

@@ -164,7 +164,7 @@ pub fn deinit(app: *App, _: *mach.Engine) void {
     app.bind_group2.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -241,6 +241,4 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }

shaderexp/main.zig

@@ -125,7 +125,7 @@ pub fn deinit(app: *App, engine: *mach.Engine) void {
     app.bind_group.release();
 }
 
-pub fn update(app: *App, engine: *mach.Engine) !bool {
+pub fn update(app: *App, engine: *mach.Engine) !void {
     while (engine.pollEvent()) |event| {
         switch (event) {
             .key_press => |ev| {
@@ -143,7 +143,7 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
             app.fragment_shader_file.seekTo(0) catch unreachable;
             app.fragment_shader_code = app.fragment_shader_file.readToEndAllocOptions(engine.allocator, std.math.maxInt(u32), null, 1, 0) catch |err| {
                 std.log.err("Err: {}", .{err});
-                return false;
+                return engine.setShouldClose(true);
             };
             app.pipeline = recreatePipeline(engine, app.fragment_shader_code, null);
         }
@@ -189,8 +189,6 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
     command.release();
     engine.swap_chain.?.present();
     back_buffer_view.release();
-
-    return true;
 }
 
 fn recreatePipeline(engine: *mach.Engine, fragment_shader_code: [:0]const u8, bgl: ?*gpu.BindGroupLayout) gpu.RenderPipeline {