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examples: sysaudio: provide better controls

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2024-04-21 16:34:46 -07:00
parent c90dcb4275
commit 58ffa2c870
1 changed files with 17 additions and 4 deletions
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15
examples/sysaudio/Piano.zig
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@ -37,12 +37,20 @@ pub const components = .{
.play_after = .{ .type = f32 }, .play_after = .{ .type = f32 },
}; };
ghost_key_mode: bool = false,
fn init(audio: *mach.Audio.Mod, piano: *Mod) void { fn init(audio: *mach.Audio.Mod, piano: *Mod) void {
// Initialize audio module // Initialize audio module
audio.send(.init, .{}); audio.send(.init, .{});
// Initialize piano module state // Initialize piano module state
piano.init(.{}); piano.init(.{});
std.debug.print("controls:\n", .{});
std.debug.print("[typing] Play piano noises\n", .{});
std.debug.print("[spacebar] enable ghost-key mode (demonstrate seamless back-to-back sound playback)\n", .{});
std.debug.print("[arrow up] increase volume 10%\n", .{});
std.debug.print("[arrow down] decrease volume 10%\n", .{});
} }
fn audioStateChange( fn audioStateChange(
@ -75,9 +83,12 @@ fn tick(
.key_press => |ev| { .key_press => |ev| {
const vol = try audio.state().player.volume(); const vol = try audio.state().player.volume();
switch (ev.key) { switch (ev.key) {
// Arrow keys turn volume up/down // Controls
.space => piano.state().ghost_key_mode = !piano.state().ghost_key_mode,
.down => try audio.state().player.setVolume(@max(0.0, vol - 0.1)), .down => try audio.state().player.setVolume(@max(0.0, vol - 0.1)),
.up => try audio.state().player.setVolume(@min(1.0, vol + 0.1)), .up => try audio.state().player.setVolume(@min(1.0, vol + 0.1)),
// Piano keys
else => { else => {
// Play a new sound // Play a new sound
const entity = try audio.newEntity(); const entity = try audio.newEntity();
@ -85,9 +96,11 @@ fn tick(
try audio.set(entity, .playing, true); try audio.set(entity, .playing, true);
try audio.set(entity, .index, 0); try audio.set(entity, .index, 0);
if (piano.state().ghost_key_mode) {
// After that sound plays, we'll chain on another sound that is one semi-tone higher. // After that sound plays, we'll chain on another sound that is one semi-tone higher.
const one_semi_tone_higher = keyToFrequency(ev.key) * math.pow(f32, 2.0, (1.0 / 12.0)); const one_semi_tone_higher = keyToFrequency(ev.key) * math.pow(f32, 2.0, (1.0 / 12.0));
try piano.set(entity, .play_after, one_semi_tone_higher); try piano.set(entity, .play_after, one_semi_tone_higher);
}
}, },
} }
}, },