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// This file contains the source code for the instruments executed by the song patterns |
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// as press, release and frame (held) events. |
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// Compiling this file using the provided build.zig will generate instruments.wat, |
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// which is referred by the song's InstrumentsFile setting. |
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|
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const std = @import("std"); |
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const math = std.math; |
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const ct = @import("ct"); |
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const gba = ct.gba; |
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|
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fn toIntFreq(comptime float_freq: f32) u32 { |
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return @intFromFloat(float_freq * 256); |
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} |
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|
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// Approximation of semitone frequency ratios using integer fractions |
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// at compile time to avoid floating point operations on the GBA. |
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const semitone_128th = [_]u32{ |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 0.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 1.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 2.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 3.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 4.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 5.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 6.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 7.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 8.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 9.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 10.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 11.0 / 12.0))), |
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@intFromFloat(math.round(128.0 * math.pow(f32, 2, 12.0 / 12.0))), |
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}; |
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fn arpeggio_cs5_e5(freq: u32, t: u32, chan: gba.Channel) void { |
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if (t > 1) { |
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const f = switch (t % 4) { |
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1 => freq, |
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2 => toIntFreq(555.4), |
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3 => toIntFreq(662.0), |
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0 => freq * 2, |
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else => unreachable, |
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}; |
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gba.CtrlFreq.init().withSquareFreq(f).writeTo(chan); |
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} |
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} |
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fn vibrato(delay: u32, p: u16, freq: u32, t: u32) u32 { |
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// Use almost half a semitone (0.475) amplitude for the delta triangle wave. |
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const ratio = comptime @as(u32, @intFromFloat(math.round(1 / (math.pow(f32, 1.0594630943592953, 0.475) - 1)))); |
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const a = freq / ratio; |
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const delta = 1 + 4 * a / p * math.absCast(@mod((@mod(@as(i32, @intCast(t - delay)) - p / 4, p) + p), p) - p / 2) - a; |
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return freq + delta; |
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} |
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var glide_base_freq: u32 = 0; |
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var glide_next_freq: u32 = 0; |
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fn glide(period: u32, freq: u32, t: u32) u32 { |
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if (glide_base_freq != 0) { |
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const s_freq: i32 = @intCast(freq); |
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const s_base: i32 = @intCast(glide_base_freq); |
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const s_t: i32 = @intCast(t); |
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const s_period: i32 = @intCast(period); |
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return @intCast(@divTrunc((s_freq - s_base) * s_t, s_period) + s_base); |
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} else { |
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return freq; |
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} |
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} |
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const square1_1 = struct { |
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pub const id: [*:0]const u8 = "S1"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(11) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(2) |
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.withDuty(gba.dut_3_4) |
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.writeTo(gba.square1); |
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gba.CtrlFreq.init() |
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.withTrigger(1) |
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.withSquareFreq(freq) |
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.writeTo(gba.square1); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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arpeggio_cs5_e5(freq, t, gba.square1); |
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} |
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}; |
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const square1_2 = struct { |
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pub const id: [*:0]const u8 = "S2"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(13) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(7) |
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.withDuty(gba.dut_3_4) |
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.writeTo(gba.square1); |
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gba.CtrlFreq.init() |
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.withTrigger(1) |
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.withSquareFreq(freq) |
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.writeTo(gba.square1); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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if (t % 14 == 0) { |
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if (t % 28 == 0) |
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gba.CtrlFreq.init().withSquareFreq(freq).writeTo(gba.square1) |
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else |
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gba.CtrlFreq.init().withSquareFreq(freq * 271 / 256).writeTo(gba.square1); |
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} |
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} |
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}; |
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const square2_1 = struct { |
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pub const id: [*:0]const u8 = "T1"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(15) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(7) |
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.withDuty(gba.dut_1_4) |
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.writeTo(gba.square2); |
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gba.CtrlFreq.init() |
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.withSquareFreq(freq * 2) |
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.withTrigger(1) |
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.writeTo(gba.square2); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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const delay = 36; |
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if (t > delay) { |
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gba.CtrlFreq.init() |
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.withSquareFreq(vibrato(delay, 8, freq, t)) |
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.writeTo(gba.square2); |
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} else if (t == 2) { |
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gba.CtrlFreq.init() |
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.withSquareFreq(freq) |
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.writeTo(gba.square2); |
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} |
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} |
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}; |
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const square2_2 = struct { |
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pub const id: [*:0]const u8 = "T2"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(13) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(4) |
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.withDuty(gba.dut_1_4) |
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.writeTo(gba.square2); |
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gba.CtrlFreq.init() |
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.withSquareFreq(freq * 2) |
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.withTrigger(1) |
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.writeTo(gba.square2); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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const delay = 15; |
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if (t > delay) { |
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gba.CtrlFreq.init() |
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.withSquareFreq(vibrato(delay, 8, freq, t)) |
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.writeTo(gba.square2); |
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} else if (t == 2) { |
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gba.CtrlFreq.init() |
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.withSquareFreq(freq) |
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.writeTo(gba.square2); |
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} |
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} |
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}; |
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const square2_3 = struct { |
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pub const id: [*:0]const u8 = "T3"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(15) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(2) |
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.withDuty(gba.dut_2_4) |
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.writeTo(gba.square2); |
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gba.CtrlFreq.init() |
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.withSquareFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.square2); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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gba.CtrlFreq.init() |
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.withFreq(gba.square2.encodeFreq(freq) - @as(u11, @truncate(0x30 * t))) |
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.writeTo(gba.square2); |
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} |
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}; |
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const triangle_table = gba.wav(0x0123456789abcdeffedcba9876543210); |
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const angled_flat_table = gba.wav(0xfedcba98765432100000000011111111); |
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const angled_square_table = gba.wav(0xfedcba987654321000000000ffffffff); |
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const square_table = gba.wav(0xffff0000ffff0000ffff0000ffff0000); |
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const jaggy_table = gba.wav(0xff880088ff8800880807060506070809); |
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// Single wave release implementation. |
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fn wave_simple_r(freq: u32, _: u8, _: u32) callconv(.C) void { |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_0) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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glide_next_freq = freq; |
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} |
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var wave_glide_period: u32 = 0; |
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var wave_vibrato_period: u16 = 0; |
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/// Common glide+vibrato implementation shared by instruments differing only by their wave table. |
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fn wave_glide_vibrato_p(freq: u32, _: u8, p0: i8, p1: i8) callconv(.C) void { |
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glide_base_freq = |
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if (p0 < 0) freq * semitone_128th[@as(usize, @intCast(p0)) % semitone_128th.len] / 128 else freq * 128 / semitone_128th[@as(usize, @intCast(p0)) % semitone_128th.len]; |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_100) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(glide_base_freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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wave_glide_period = @intCast((@as(usize, @intCast(p0)) % semitone_128th.len) * 8); |
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wave_vibrato_period = @intCast(@max(0, p1)); |
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} |
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fn wave_glide_vibrato_r(freq: u32, _: u8, t: u32) callconv(.C) void { |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_0) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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if (wave_glide_period != 0 and t <= wave_glide_period) { |
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// Adjust the next glide base if we released within the glide. |
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glide_next_freq = glide(wave_glide_period, freq, t); |
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} else { |
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glide_next_freq = freq; |
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} |
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} |
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fn wave_glide_vibrato_f(freq: u32, _: u8, t: u32) callconv(.C) void { |
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const vibrato_delay = 49; |
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if (wave_glide_period != 0 and t <= wave_glide_period) { |
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gba.CtrlFreq.init() |
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.withWaveFreq(glide(wave_glide_period, freq, t)) |
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.writeTo(gba.wave); |
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} else if (t > vibrato_delay and wave_vibrato_period > 0) { |
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gba.CtrlFreq.init() |
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.withWaveFreq(vibrato(vibrato_delay, wave_vibrato_period, freq, t)) |
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.writeTo(gba.wave); |
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} |
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} |
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const wave_1 = struct { |
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pub const id: [*:0]const u8 = "W1"; |
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pub fn press(freq: u32, note: u8, p0: i8, p1: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&triangle_table); |
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wave_glide_vibrato_p(freq, note, p0, p1); |
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} |
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pub const release = wave_glide_vibrato_r; |
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pub const frame = wave_glide_vibrato_f; |
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}; |
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const wave_2 = struct { |
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pub const id: [*:0]const u8 = "W2"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&angled_flat_table); |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_100) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq * 2) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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} |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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if (t == 1) |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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} |
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}; |
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const wave_3 = struct { |
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pub const id: [*:0]const u8 = "W3"; |
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pub fn press(freq: u32, note: u8, p0: i8, p1: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&angled_flat_table); |
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wave_glide_vibrato_p(freq, note, p0, p1); |
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} |
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pub const release = wave_glide_vibrato_r; |
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pub const frame = wave_glide_vibrato_f; |
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}; |
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const wave_4 = struct { |
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pub const id: [*:0]const u8 = "W4"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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// Only bounce and glide if we got a next base freq and if it's higher than freq |
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glide_base_freq = if (glide_next_freq != 0 and glide_next_freq > freq) glide_next_freq else freq; |
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gba.WaveRam.setTable(&angled_flat_table); |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_100) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(glide_base_freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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} |
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pub const release = wave_simple_r; |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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const period_up = 3; |
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const period_down = 9; |
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if (t <= period_up + period_down) { |
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if (glide_base_freq != 0) { |
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const up_freq = glide_base_freq + (glide_base_freq - freq); |
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if (t <= period_up) { |
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// Bounce up from freq (not implemented) |
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const f = (up_freq - glide_base_freq) * t / period_up + glide_base_freq; |
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gba.CtrlFreq.init() |
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.withWaveFreq(f) |
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.writeTo(gba.wave); |
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} else { |
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// Interpolate to back into freq |
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const f = up_freq - (up_freq - freq) * (t - period_up) / period_down; |
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gba.CtrlFreq.init() |
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.withWaveFreq(f) |
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.writeTo(gba.wave); |
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} |
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} |
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} |
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} |
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}; |
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const wave_5 = struct { |
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pub const id: [*:0]const u8 = "W5"; |
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pub fn press(freq: u32, note: u8, p0: i8, p1: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&angled_square_table); |
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wave_glide_vibrato_p(freq, note, p0, p1); |
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} |
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pub const release = wave_glide_vibrato_r; |
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pub const frame = wave_glide_vibrato_f; |
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}; |
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const wave_6 = struct { |
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pub const id: [*:0]const u8 = "W6"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&jaggy_table); |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_50) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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} |
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pub const release = wave_simple_r; |
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}; |
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const wave_7 = struct { |
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pub const id: [*:0]const u8 = "W7"; |
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pub fn press(freq: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.WaveRam.setTable(&square_table); |
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gba.WaveVolLen.init() |
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.withVolume(gba.vol_25) |
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.writeTo(gba.wave); |
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gba.CtrlFreq.init() |
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.withWaveFreq(freq) |
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.withTrigger(1) |
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.writeTo(gba.wave); |
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} |
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pub const release = wave_simple_r; |
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pub fn frame(freq: u32, _: u8, t: u32) callconv(.C) void { |
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const delay = 49; |
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if (t > delay) |
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gba.CtrlFreq.init() |
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.withWaveFreq(vibrato(delay, 8, freq, t)) |
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.writeTo(gba.wave); |
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} |
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}; |
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|
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const noise_1 = struct { |
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pub const id: [*:0]const u8 = "N1"; |
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|
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pub fn press(_: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(7) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(1) |
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.writeTo(gba.noise); |
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gba.NoiseCtrlFreq.init() |
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.withTrigger(1) |
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.writeTo(gba.noise); |
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} |
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|
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pub fn frame(_: u32, _: u8, t: u32) callconv(.C) void { |
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switch (t) { |
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0 => (gba.NoiseCtrlFreq{ .freq = 1 }).writeTo(gba.noise), |
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1 => (gba.NoiseCtrlFreq{ .freq = 2 }).writeTo(gba.noise), |
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2 => (gba.NoiseCtrlFreq{ .freq = 1 }).writeTo(gba.noise), |
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3 => (gba.NoiseCtrlFreq{ .freq = 2 }).writeTo(gba.noise), |
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4 => (gba.NoiseCtrlFreq{ .freq = 1 }).writeTo(gba.noise), |
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// 5 |
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6 => (gba.NoiseCtrlFreq{ .freq = 2 }).writeTo(gba.noise), |
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7 => (gba.NoiseCtrlFreq{ .freq = 1 }).writeTo(gba.noise), |
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8 => (gba.NoiseCtrlFreq{ .freq = 2 }).writeTo(gba.noise), |
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else => {}, |
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} |
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} |
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}; |
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|
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const noise_2 = struct { |
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pub const id: [*:0]const u8 = "N2"; |
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|
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pub fn press(_: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(10) |
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.withEnvDir(gba.env_dec) |
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.withEnvInterval(1) |
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.writeTo(gba.noise); |
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gba.NoiseCtrlFreq.init() |
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.withTrigger(1) |
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.writeTo(gba.noise); |
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} |
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|
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pub fn frame(_: u32, _: u8, t: u32) callconv(.C) void { |
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switch (t) { |
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0 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_7, .freq_div = gba.div_16 }).writeTo(gba.noise), |
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1 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_7, .freq_div = gba.div_48 }).writeTo(gba.noise), |
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// 2 |
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3 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_7, .freq_div = gba.div_80 }).writeTo(gba.noise), |
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4 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_7, .freq_div = gba.div_112 }).writeTo(gba.noise), |
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5 => (gba.NoiseCtrlFreq{ .freq = 6, .width = gba.wid_15, .freq_div = gba.div_8 }).writeTo(gba.noise), |
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else => {}, |
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} |
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} |
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}; |
|
|
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const noise_3 = struct { |
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pub const id: [*:0]const u8 = "N3"; |
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|
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pub fn press(_: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
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gba.EnvDutyLen.init() |
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.withEnvStart(10) |
|
.withEnvDir(gba.env_dec) |
|
.withEnvInterval(2) |
|
.writeTo(gba.noise); |
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gba.NoiseCtrlFreq.init() |
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.withTrigger(1) |
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.writeTo(gba.noise); |
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} |
|
|
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pub fn frame(_: u32, _: u8, t: u32) callconv(.C) void { |
|
switch (t) { |
|
0 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_7, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
1 => (gba.NoiseCtrlFreq{ .freq = 7, .width = gba.wid_7, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
2 => (gba.NoiseCtrlFreq{ .freq = 6, .width = gba.wid_7, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
3 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_15, .freq_div = gba.div_8 }).writeTo(gba.noise), |
|
// 4 |
|
5 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_15, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
6 => (gba.NoiseCtrlFreq{ .freq = 4, .width = gba.wid_15, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
7 => (gba.NoiseCtrlFreq{ .freq = 5, .width = gba.wid_15, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
else => {}, |
|
} |
|
} |
|
}; |
|
|
|
const noise_4 = struct { |
|
pub const id: [*:0]const u8 = "N4"; |
|
|
|
pub fn press(_: u32, _: u8, _: i8, _: i8) callconv(.C) void { |
|
gba.EnvDutyLen.init() |
|
.withEnvStart(7) |
|
.withEnvDir(gba.env_dec) |
|
.withEnvInterval(2) |
|
.writeTo(gba.noise); |
|
gba.NoiseCtrlFreq.init() |
|
.withTrigger(1) |
|
.writeTo(gba.noise); |
|
} |
|
|
|
pub fn frame(_: u32, _: u8, t: u32) callconv(.C) void { |
|
switch (t) { |
|
0 => (gba.NoiseCtrlFreq{ .freq = 1, .freq_div = gba.div_16 }).writeTo(gba.noise), |
|
1 => (gba.NoiseCtrlFreq{ .freq = 1, .freq_div = gba.div_32 }).writeTo(gba.noise), |
|
2 => (gba.NoiseCtrlFreq{ .freq = 1, .freq_div = gba.div_48 }).writeTo(gba.noise), |
|
3 => (gba.NoiseCtrlFreq{ .freq = 1, .freq_div = gba.div_64 }).writeTo(gba.noise), |
|
4 => (gba.NoiseCtrlFreq{ .freq = 1, .freq_div = gba.div_80 }).writeTo(gba.noise), |
|
else => {}, |
|
} |
|
} |
|
}; |
|
|
|
pub fn main() void { |
|
ct.registerInstrument(square1_1, 0); |
|
ct.registerInstrument(square1_2, 0); |
|
ct.registerInstrument(square2_1, 0); |
|
ct.registerInstrument(square2_2, 0); |
|
ct.registerInstrument(square2_3, 1); |
|
ct.registerInstrument(wave_1, 1); |
|
ct.registerInstrument(wave_2, 1); |
|
ct.registerInstrument(wave_3, 1); |
|
ct.registerInstrument(wave_4, 2); |
|
ct.registerInstrument(wave_5, 2); |
|
ct.registerInstrument(wave_6, 2); |
|
ct.registerInstrument(wave_7, 2); |
|
ct.registerInstrument(noise_1, 3); |
|
ct.registerInstrument(noise_2, 3); |
|
ct.registerInstrument(noise_3, 3); |
|
ct.registerInstrument(noise_4, 3); |
|
} |
