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Audio: rewrite sample mixing to use SIMD properly

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2024-12-29 15:15:56 -07:00
parent 1a7753936b
commit 6450e8abbf
5 changed files with 234 additions and 52 deletions
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4
examples/piano/App.zig
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@ -203,13 +203,13 @@ pub fn tick(
window.queue.submit(&[_]*gpu.CommandBuffer{command});
}
fn fillTone(app: *App, audio: *mach.Audio, frequency: f32) ![]const f32 {
fn fillTone(app: *App, audio: *mach.Audio, frequency: f32) ![]align(mach.Audio.alignment) const f32 {
const channels = audio.player.channels().len;
const sample_rate: f32 = @floatFromInt(audio.player.sampleRate());
const duration: f32 = 1.5 * @as(f32, @floatFromInt(channels)) * sample_rate; // play the tone for 1.5s
const gain = 0.1;
const samples = try app.allocator.alloc(f32, @intFromFloat(duration));
const samples = try app.allocator.alignedAlloc(f32, mach.Audio.alignment, @intFromFloat(duration));
var i: usize = 0;
while (i < samples.len) : (i += channels) {