From bbe2ecfa532db8b34feea02673e2bdc7eb62d67e Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Mon, 10 Jan 2022 01:22:55 -0400
Subject: [PATCH] chore: add FPS counter

---
 src/main.zig      | 10 ++++++++++
 src/scheduler.zig |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/main.zig b/src/main.zig
index 0a5a83c..abe4e02 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -6,6 +6,8 @@ const Bus = @import("Bus.zig");
 const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
 const Scheduler = @import("scheduler.zig").Scheduler;
 
+const Timer = std.time.Timer;
+
 const buf_pitch = @import("ppu.zig").buf_pitch;
 
 pub fn main() anyerror!void {
@@ -59,6 +61,10 @@ pub fn main() anyerror!void {
     const texture = SDL.SDL_CreateTexture(renderer, SDL.SDL_PIXELFORMAT_BGR555, SDL.SDL_TEXTUREACCESS_STREAMING, 240, 160) orelse sdlPanic();
     defer SDL.SDL_DestroyTexture(texture);
 
+    // Init FPS Timer
+    var timer = Timer.start() catch unreachable;
+    var title_buf: [0x30]u8 = [_]u8{0x00} ** 0x30;
+
     emu_loop: while (true) {
         emu.runFrame(&scheduler, &cpu, &bus);
 
@@ -74,6 +80,10 @@ pub fn main() anyerror!void {
         _ = SDL.SDL_UpdateTexture(texture, null, buf_ptr, buf_pitch);
         _ = SDL.SDL_RenderCopy(renderer, texture, null, null);
         SDL.SDL_RenderPresent(renderer);
+
+        const fps = std.time.ns_per_s / timer.lap();
+        const title = std.fmt.bufPrint(&title_buf, "Gameboy Advance Emulator FPS: {d}", .{fps}) catch unreachable;
+        SDL.SDL_SetWindowTitle(window, title.ptr);
     }
 }
 
diff --git a/src/scheduler.zig b/src/scheduler.zig
index 6e91fb5..0247dc5 100644
--- a/src/scheduler.zig
+++ b/src/scheduler.zig
@@ -29,7 +29,7 @@ pub const Scheduler = struct {
 
         if (should_handle) {
             const event = self.queue.remove();
-            std.log.info("[Scheduler] Handle {} at {} ticks", .{ event.kind, self.tick });
+            // std.log.info("[Scheduler] Handle {} at {} ticks", .{ event.kind, self.tick });
 
             switch (event.kind) {
                 .HeatDeath => {