fix: reimplement grabbing ROM title if provided via cmd arg

build.zig

@@ -6,7 +6,7 @@ const gdbstub = @import("lib/zba-gdbstub/build.zig");
 const zgui = @import("lib/zgui/build.zig");
 const nfd = @import("lib/nfd-zig/build.zig");
 
-pub fn build(b: *std.build.Builder) void {
+pub fn build(b: *std.Build) void {
     // Minimum Zig Version
     const min_ver = std.SemanticVersion.parse("0.11.0-dev.2168+322ace70f") catch return; // https://github.com/ziglang/zig/commit/322ace70f
     if (builtin.zig_version.order(min_ver).compare(.lt)) {

src/imgui.zig

@@ -31,12 +31,12 @@ pub const State = struct {
     fps_hist: RingBuffer(u32),
     should_quit: bool = false,
 
-    pub fn init(allocator: Allocator) !@This() {
+    /// if zba is initialized with a ROM already provided, this initializer should be called
+    /// with `title_opt` being non-null
+    pub fn init(allocator: Allocator, title_opt: ?*const [12]u8) !@This() {
         const history = try allocator.alloc(u32, histogram_len);
 
-        var title: [12:0]u8 = [_:0]u8{0} ** 12;
+        const title: [12:0]u8 = if (title_opt) |t| t.* ++ [_:0]u8{} else "[No Title]\x00\x00".*;
-        std.mem.copy(u8, &title, "[No Title]");
-
         return .{ .title = title, .fps_hist = RingBuffer(u32).init(history) };
     }
 

src/main.zig

@@ -90,8 +90,10 @@ pub fn main() void {
         cpu.fastBoot();
     }
 
+    const title_ptr = if (paths.rom != null) &bus.pak.title else null;
+
     // TODO: Just copy the title instead of grabbing a pointer to it
-    var gui = Gui.init(allocator, &bus.apu) catch |e| exitln("failed to init gui: {}", .{e});
+    var gui = Gui.init(allocator, &bus.apu, title_ptr) catch |e| exitln("failed to init gui: {}", .{e});
     defer gui.deinit();
 
     var quit = std.atomic.Atomic(bool).init(false);

src/platform.zig

@@ -57,7 +57,7 @@ pub const Gui = struct {
     allocator: Allocator,
     program_id: gl.GLuint,
 
-    pub fn init(allocator: Allocator, apu: *Apu) !Self {
+    pub fn init(allocator: Allocator, apu: *Apu, title_opt: ?*const [12]u8) !Self {
         if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO) < 0) panic();
         if (SDL.SDL_GL_SetAttribute(SDL.SDL_GL_CONTEXT_PROFILE_MASK, SDL.SDL_GL_CONTEXT_PROFILE_CORE) < 0) panic();
         if (SDL.SDL_GL_SetAttribute(SDL.SDL_GL_CONTEXT_MAJOR_VERSION, 3) < 0) panic();
@@ -91,7 +91,7 @@ pub const Gui = struct {
             .audio = Audio.init(apu),
 
             .allocator = allocator,
-            .state = try imgui.State.init(allocator),
+            .state = try imgui.State.init(allocator, title_opt),
         };
     }