add raylib dependency and desktop platform driver with interactive play mode

build.zig

@@ -38,7 +38,6 @@ pub fn build(b: *std.Build) void {
         .root_source_file = b.path("src/platform/root.zig"),
     });
     platform_mod.addImport("contract", contract_mod);
-
     const frontend_mod = b.createModule(.{
         .target = target,
         .optimize = optimize,
@@ -63,6 +62,23 @@ pub fn build(b: *std.Build) void {
         .root_module = exe_mod,
     });
 
+    if (b.lazyDependency("raylib", .{
+        .target = target,
+        .optimize = optimize,
+    })) |raylib_dep| {
+        const raylib_lib = raylib_dep.artifact("raylib");
+        exe_mod.linkLibrary(raylib_lib);
+
+        const raylib_c = b.addTranslateC(.{
+            .target = target,
+            .optimize = optimize,
+            .root_source_file = raylib_dep.path("src/raylib.h"),
+        });
+        const craylib_mod = raylib_c.createModule();
+        platform_mod.addImport("c_raylib", craylib_mod);
+        exe_mod.addImport("c_raylib", craylib_mod);
+    }
+
     b.installArtifact(exe);
 
     // Test Step Configuration

build.zig.zon

@@ -13,6 +13,10 @@
             .hash = "N-V-__8AAKmLHACkwIMCMRdqnsyLtL5hbQdi8cm3nGs8n-O7",
             .lazy = true,
         },
+        .raylib = .{
+            .url = "https://github.com/raysan5/raylib/archive/refs/heads/master.tar.gz",
+            .hash = "raylib-6.0.0-whq8uIPTKwXybRNNu7BJNM6bxip5fYUgAh-bctTa7oHR",
+        },
     },
 
     .paths = .{""},

src/main.zig

@@ -29,13 +29,16 @@ pub fn main(init: std.process.Init) !void {
         return;
     }
 
-    if (!std.mem.eql(u8, command, "run")) {
+    const is_play = std.mem.eql(u8, command, "play");
+    const is_run = std.mem.eql(u8, command, "run");
+
+    if (!is_play and !is_run) {
         std.debug.print("Unknown command '{s}'. Use '6soz --help' for usage.\n", .{command});
         return;
     }
 
     if (args_count < 3) {
-        std.debug.print("Error: missing ROM file path.\nUsage: 6soz run <path/to/rom.nes>\n", .{});
+        std.debug.print("Error: missing ROM file path.\nUsage: 6soz play <path/to/rom.nes> or 6soz run <path/to/rom.nes>\n", .{});
         return;
     }
 
@@ -102,6 +105,7 @@ pub fn main(init: std.process.Init) !void {
     }
 
     const frontend = @import("frontend");
+    const platform = @import("platform");
 
     const nes_bindings = frontend.Bindings{
         .keys = &.{
@@ -121,6 +125,19 @@ pub fn main(init: std.process.Init) !void {
 
     var quick_save_buffer: [64 * 1024]u8 = undefined;
     var app = frontend.App(Nes).init(&nes, nes_bindings, .{ .quick_state_buffer = &quick_save_buffer });
+
+    if (is_play) {
+        std.debug.print("[6soz] Launching Raylib Desktop Window...\n", .{});
+        var driver = platform.raylib.Driver.init("6soz NES Emulator Engine", 256, 240, 3);
+        defer driver.deinit();
+
+        while (app.state != .stopped and !driver.shouldClose()) {
+            while (driver.pollEvent()) |event| {
+                app.handleEvent(event);
+            }
+            app.tickFrame(&driver);
+        }
+    } else {
         var driver = frontend.HeadlessDriver.init();
 
         std.debug.print("[6soz] Running NES emulator for {d} frames...\n", .{target_frames});
@@ -140,6 +157,7 @@ pub fn main(init: std.process.Init) !void {
         std.debug.print("  - Frames: {d}\n", .{target_frames});
         std.debug.print("  - Elapsed Time: {d:.3}s\n", .{elapsed_sec});
         std.debug.print("  - Performance: {d:.1} FPS\n", .{fps});
+    }
 
     if (save_state_path) |path| {
         var state_buf: [64 * 1024]u8 = undefined;
@@ -166,7 +184,8 @@ fn printUsage() void {
     std.debug.print(
         \\6soz - 6502 / 6510 & NES Emulator Engine
         \\Usage:
-        \\  6soz run <path/to/rom.nes> [options]
+        \\  6soz play <path/to/rom.nes>          Launch interactive Raylib desktop window
+        \\  6soz run <path/to/rom.nes> [options] Run headless emulator benchmark
         \\
         \\Options:
         \\  --frames <N>         Number of frames to execute (default: 60)

src/platform/raylib.zig

@@ -0,0 +1,116 @@
+const std = @import("std");
+const contract = @import("contract");
+const platform = @import("root.zig");
+const c = @import("c_raylib");
+
+pub const Driver = struct {
+    texture: c.Texture2D,
+    audio_stream: c.AudioStream,
+    width: i32,
+    height: i32,
+    scale: i32,
+
+    event_queue: [16]platform.Event = undefined,
+    event_head: usize = 0,
+    event_tail: usize = 0,
+
+    pub fn init(title: [*:0]const u8, width: i32, height: i32, scale: i32) Driver {
+        c.InitWindow(width * scale, height * scale, title);
+        c.SetTargetFPS(60);
+
+        c.InitAudioDevice();
+        c.SetAudioStreamBufferSizeDefault(1024);
+
+        const stream = c.LoadAudioStream(44100, 16, 1);
+        c.PlayAudioStream(stream);
+
+        const img = c.GenImageColor(width, height, c.BLACK);
+        defer c.UnloadImage(img);
+
+        const tex = c.LoadTextureFromImage(img);
+        c.SetTextureFilter(tex, c.TEXTURE_FILTER_POINT);
+
+        return .{
+            .texture = tex,
+            .audio_stream = stream,
+            .width = width,
+            .height = height,
+            .scale = scale,
+        };
+    }
+
+    pub fn deinit(self: *Driver) void {
+        c.UnloadAudioStream(self.audio_stream);
+        c.CloseAudioDevice();
+        c.UnloadTexture(self.texture);
+        c.CloseWindow();
+    }
+
+    pub fn shouldClose(_: *Driver) bool {
+        return c.WindowShouldClose();
+    }
+
+    pub fn pollEvent(self: *Driver) ?platform.Event {
+        if (self.event_head != self.event_tail) {
+            const ev = self.event_queue[self.event_tail];
+            self.event_tail = (self.event_tail + 1) % self.event_queue.len;
+            return ev;
+        }
+
+        // Poll Raylib Key Events
+        const key_mappings = [_]struct { c_key: c_int, key: platform.Key }{
+            .{ .c_key = c.KEY_Z, .key = .z },
+            .{ .c_key = c.KEY_X, .key = .x },
+            .{ .c_key = c.KEY_RIGHT_SHIFT, .key = .right_shift },
+            .{ .c_key = c.KEY_LEFT_SHIFT, .key = .left_shift },
+            .{ .c_key = c.KEY_ENTER, .key = .enter },
+            .{ .c_key = c.KEY_UP, .key = .up },
+            .{ .c_key = c.KEY_DOWN, .key = .down },
+            .{ .c_key = c.KEY_LEFT, .key = .left },
+            .{ .c_key = c.KEY_RIGHT, .key = .right },
+            .{ .c_key = c.KEY_F5, .key = .f5 },
+            .{ .c_key = c.KEY_F8, .key = .f8 },
+            .{ .c_key = c.KEY_P, .key = .p },
+        };
+
+        for (key_mappings) |mapping| {
+            if (c.IsKeyPressed(mapping.c_key)) {
+                return .{ .key_down = .{ .key = mapping.key } };
+            }
+            if (c.IsKeyReleased(mapping.c_key)) {
+                return .{ .key_up = .{ .key = mapping.key } };
+            }
+        }
+
+        return null;
+    }
+
+    pub fn renderVideo(self: *Driver, output: usize, frame: contract.VideoFrame) void {
+        _ = output;
+        if (frame.data.len > 0) {
+            c.UpdateTexture(self.texture, frame.data.ptr);
+        }
+
+        c.BeginDrawing();
+        defer c.EndDrawing();
+
+        c.ClearBackground(c.BLACK);
+        const src = c.Rectangle{ .x = 0, .y = 0, .width = @floatFromInt(self.width), .height = @floatFromInt(self.height) };
+        const dest = c.Rectangle{
+            .x = 0,
+            .y = 0,
+            .width = @floatFromInt(self.width * self.scale),
+            .height = @floatFromInt(self.height * self.scale),
+        };
+        c.DrawTexturePro(self.texture, src, dest, c.Vector2{ .x = 0, .y = 0 }, 0.0, c.WHITE);
+    }
+
+    pub fn queueAudio(self: *Driver, output: usize, buffer: contract.AudioBuffer) void {
+        _ = output;
+        if (buffer.frames > 0 and c.IsAudioStreamProcessed(self.audio_stream)) {
+            c.UpdateAudioStream(self.audio_stream, buffer.data.ptr, @intCast(buffer.frames));
+        }
+    }
+
+    pub fn setDeviceFeedback(_: *Driver, _: usize, _: contract.DeviceFeedback) void {}
+};

src/platform/root.zig

@@ -130,6 +130,8 @@ pub const Headless = struct {
     }
 };
 
+pub const raylib = @import("raylib.zig");
+
 test "platform: headless has no events" {
     var platform_driver = Headless.init();