Custom logger and console, setup IO callbacks

src/Log.zig

@@ -0,0 +1,11 @@
+const std = @import("std");
+
+level: std.log.Level,
+message: []const u8,
+
+pub fn init(level: std.log.Level, message: []const u8) @This() {
+    return .{
+        .level = level,
+        .message = message,
+    };
+}

src/game.zig

@@ -0,0 +1,110 @@
+const std = @import("std");
+
+const zglfw = @import("zglfw");
+const zgui = @import("zgui");
+
+const main = @import("main.zig");
+
+var show_console: bool = false;
+var show_demo_window: bool = false;
+
+pub fn init() void {}
+
+pub fn update(dt: f32) void {
+    _ = dt;
+
+    if (show_console) {
+        showConsole();
+    }
+
+    if (show_demo_window) {
+        zgui.showDemoWindow(&show_demo_window);
+    }
+}
+
+pub fn charCallback(
+    _: *zglfw.Window,
+    codepoint: u32,
+) callconv(.C) void {
+    _ = codepoint;
+}
+
+pub fn cursorPosCallback(
+    _: *zglfw.Window,
+    xpos: f64,
+    ypos: f64,
+) callconv(.C) void {
+    _ = xpos;
+    _ = ypos;
+}
+
+pub fn keyCallback(
+    _: *zglfw.Window,
+    key: zglfw.Key,
+    scancode: c_int,
+    action: zglfw.Action,
+    mods: zglfw.Mods,
+) callconv(.C) void {
+    _ = scancode;
+
+    const no_mods = @as(c_int, @bitCast(mods)) == 0;
+
+    if (key == .grave_accent and action == .press and no_mods) {
+        show_console = !show_console;
+    }
+
+    if (key == .F1 and action == .press and no_mods) {
+        show_demo_window = true;
+    }
+}
+
+pub fn mouseButtonCallback(
+    _: *zglfw.Window,
+    button: zglfw.MouseButton,
+    action: zglfw.Action,
+    mods: zglfw.Mods,
+) callconv(.C) void {
+    _ = button;
+    _ = action;
+    _ = mods;
+}
+
+pub fn scrollCallback(
+    _: *zglfw.Window,
+    xoffset: f64,
+    yoffset: f64,
+) callconv(.C) void {
+    _ = xoffset;
+    _ = yoffset;
+}
+
+pub fn deinit() void {}
+
+fn showConsole() void {
+    const display_size = zgui.io.getDisplaySize();
+    zgui.setNextWindowPos(.{
+        .x = 0,
+        .y = 0,
+    });
+    zgui.setNextWindowSize(.{
+        .w = display_size[0],
+        .h = main.min_window_height,
+        .cond = .once,
+    });
+    if (zgui.begin("Console", .{ .flags = .{
+        .no_title_bar = true,
+        .no_resize = true,
+        .no_move = true,
+        .no_collapse = true,
+    } })) {
+        for (main.logs.items) |log| {
+            zgui.textUnformattedColored(switch (log.level) {
+                .err => .{ 1, 0, 0, 1 },
+                .warn => .{ 1, 1, 0, 1 },
+                .info => .{ 1, 1, 1, 1 },
+                .debug => .{ 0.5, 0.5, 0.5, 1 },
+            }, log.message);
+        }
+    }
+    zgui.end();
+}

src/main.zig

@@ -6,12 +6,27 @@ const zgpu = @import("zgpu");
 const zgui = @import("zgui");
 const ztracy = @import("ztracy");
 
+const game = @import("game.zig");
+const Log = @import("Log.zig");
+
+pub const min_framerate = 30.0;
+pub const min_frametime = 1.0 / min_framerate;
+pub const min_window_height = 360;
+pub const min_window_width = 640;
+pub const temp_allocator_capacity = 16 * 1024 * 1024;
+pub const window_title = "voxel-game";
+
 pub var allocator: std.mem.Allocator = undefined;
 pub var audio_engine: *zaudio.Engine = undefined;
 pub var gctx: *zgpu.GraphicsContext = undefined;
+pub var logs: std.ArrayListUnmanaged(Log) = undefined;
 pub var temp_allocator: std.mem.Allocator = undefined;
 pub var window: *zglfw.Window = undefined;
 
+pub const std_options: std.Options = .{
+    .logFn = logFn,
+};
+
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     defer _ = gpa.deinit();
@@ -19,12 +34,19 @@ pub fn main() !void {
     var ta = ztracy.TracyAllocator.init(gpa.allocator());
 
     var fba = std.heap.FixedBufferAllocator.init(&struct {
-        pub var buffer: [16 * 1024 * 1024]u8 = undefined;
+        pub var buffer: [temp_allocator_capacity]u8 = undefined;
     }.buffer);
 
     allocator = ta.allocator();
     temp_allocator = fba.threadSafeAllocator();
 
+    defer {
+        for (logs.items) |log| {
+            allocator.free(log.message);
+        }
+        logs.deinit(allocator);
+    }
+
     // --- zaudio --------------------------------------------------------------
 
     const zone_init_zaudio = ztracy.ZoneN(@src(), "Init zaudio");
@@ -44,11 +66,25 @@ pub fn main() !void {
     try zglfw.init();
     defer zglfw.terminate();
 
+    const monitor = zglfw.getPrimaryMonitor() orelse return error.PrimaryMonitorNotFound;
+    const video_mode = try monitor.getVideoMode();
+
     zglfw.windowHint(.client_api, .no_api);
-    window = try zglfw.Window.create(1280, 720, "voxel-game", null);
+    window = try zglfw.Window.create(video_mode.width, video_mode.height, window_title, monitor);
-    window.setSizeLimits(640, 360, -1, -1);
+    window.setSizeLimits(
+        min_window_width,
+        min_window_height,
+        -1,
+        -1,
+    );
     defer window.destroy();
 
+    std.debug.assert(zglfw.setCharCallback(window, game.charCallback) == null);
+    std.debug.assert(zglfw.setCursorPosCallback(window, game.cursorPosCallback) == null);
+    std.debug.assert(zglfw.setKeyCallback(window, game.keyCallback) == null);
+    std.debug.assert(zglfw.setMouseButtonCallback(window, game.mouseButtonCallback) == null);
+    std.debug.assert(zglfw.setScrollCallback(window, game.scrollCallback) == null);
+
     zone_init_zglfw.End();
 
     // --- zgpu ----------------------------------------------------------------
@@ -81,7 +117,7 @@ pub fn main() !void {
         window,
         gctx.device,
         @intFromEnum(zgpu.GraphicsContext.swapchain_format),
-        @intFromEnum(zgpu.wgpu.TextureFormat.depth32_float),
+        @intFromEnum(zgpu.wgpu.TextureFormat.undef),
     );
     defer zgui.backend.deinit();
 
@@ -89,21 +125,38 @@ pub fn main() !void {
 
     zone_init_zgui.End();
 
+    // --- game ----------------------------------------------------------------
+
+    const zone_init_game = ztracy.ZoneN(@src(), "Init game");
+
+    game.init();
+    defer game.deinit();
+
+    zone_init_game.End();
+
     // --- main loop -----------------------------------------------------------
 
     const zone_main_loop = ztracy.ZoneN(@src(), "Main loop");
 
+    var t2 = zglfw.getTime();
+
     while (!window.shouldClose()) {
         ztracy.FrameMark();
 
         fba.reset();
 
+        const t1 = zglfw.getTime();
+        const dt: f32 = @floatCast(@max(t2 - t1, min_frametime));
+        t2 = t1;
+
         zglfw.pollEvents();
         zgui.backend.newFrame(
             gctx.swapchain_descriptor.width,
             gctx.swapchain_descriptor.height,
         );
 
+        game.update(dt);
+
         const swapchain_texture_view = gctx.swapchain.getCurrentTextureView();
         defer swapchain_texture_view.release();
 
@@ -134,3 +187,16 @@ pub fn main() !void {
 
     zone_main_loop.End();
 }
+
+fn logFn(
+    comptime level: std.log.Level,
+    comptime _: @Type(.enum_literal),
+    comptime fmt: []const u8,
+    args: anytype,
+) void {
+    const message = std.fmt.allocPrint(allocator, fmt, args) catch return;
+    logs.append(allocator, Log.init(level, message)) catch {
+        allocator.free(message);
+        return;
+    };
+}