From 2bce02baaa692b36d30ce3228d55adc43323e7b5 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Sun, 30 Oct 2022 05:03:02 -0300
Subject: [PATCH] revert(apu): switch from f32 44.1kHz to u16 32.768kHz

---
 src/core/emu.zig |  4 ++--
 src/platform.zig | 12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/core/emu.zig b/src/core/emu.zig
index a1c7259..0c8a03c 100644
--- a/src/core/emu.zig
+++ b/src/core/emu.zig
@@ -105,8 +105,8 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
 }
 
 fn audioSync(audio_sync: bool, stream: *SDL.SDL_AudioStream, is_buffer_full: *bool) void {
-    comptime std.debug.assert(@import("../platform.zig").sample_format == SDL.AUDIO_F32);
-    const sample_size = 2 * @sizeOf(f32);
+    comptime std.debug.assert(@import("../platform.zig").sample_format == SDL.AUDIO_U16);
+    const sample_size = 2 * @sizeOf(u16);
     const max_buf_size: c_int = 0x400;
 
     // Determine whether the APU is busy right at this moment
diff --git a/src/platform.zig b/src/platform.zig
index f4325dd..8e3cc87 100644
--- a/src/platform.zig
+++ b/src/platform.zig
@@ -14,8 +14,8 @@ const span = @import("util.zig").span;
 const gba_width = @import("core/ppu.zig").width;
 const gba_height = @import("core/ppu.zig").height;
 
-pub const sample_rate = 44100;
-pub const sample_format = SDL.AUDIO_F32;
+pub const sample_rate = 1 << 15;
+pub const sample_format = SDL.AUDIO_U16;
 
 const default_title: []const u8 = "ZBA";
 
@@ -203,8 +203,8 @@ pub const Gui = struct {
                             SDL.SDLK_RETURN => io.keyinput.start.set(),
                             SDL.SDLK_RSHIFT => io.keyinput.select.set(),
                             SDL.SDLK_i => {
-                                comptime std.debug.assert(sample_format == SDL.AUDIO_F32);
-                                log.err("Sample Count: {}", .{@intCast(u32, SDL.SDL_AudioStreamAvailable(cpu.bus.apu.stream)) / (2 * @sizeOf(f32))});
+                                comptime std.debug.assert(sample_format == SDL.AUDIO_U16);
+                                log.err("Sample Count: {}", .{@intCast(u32, SDL.SDL_AudioStreamAvailable(cpu.bus.apu.stream)) / (2 * @sizeOf(u16))});
                             },
                             SDL.SDLK_j => log.err("Scheduler Capacity: {} | Scheduler Event Count: {}", .{ scheduler.queue.capacity(), scheduler.queue.count() }),
                             SDL.SDLK_k => {
@@ -271,8 +271,8 @@ const Audio = struct {
         want.callback = Self.callback;
         want.userdata = apu;
 
-        std.debug.assert(sample_format == SDL.AUDIO_F32);
-        log.info("Host Sample Rate: {}Hz, Host Format: SDL.AUDIO_F32", .{sample_rate});
+        std.debug.assert(sample_format == SDL.AUDIO_U16);
+        log.info("Host Sample Rate: {}Hz, Host Format: SDL.AUDIO_U16", .{sample_rate});
 
         const device = SDL.SDL_OpenAudioDevice(null, 0, &want, &have, 0);
         if (device == 0) panic();