147 lines
No EOL
4.2 KiB
Zig
147 lines
No EOL
4.2 KiB
Zig
const std = @import("std");
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const math = std.math;
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const print = std.debug.print;
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const Activity = @import ("../activity.zig").Activity;
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const SoundNode = @import("../soundnode.zig").SoundNode;
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const utility = @import("../utility.zig");
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const dbg = utility.dbg;
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const idbg = utility.idbg;
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// Produces a sine wave to r_amp pin
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pub fn sine(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const amp = math.sin(utility.corrected_tau * self.soundnode.basefreq * current_tick - self.soundnode.totalPhase() * utility.tau);
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const final_amp = gain * amp;
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self.soundnode.add_r_amp(final_amp);
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}
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// Produces a triangle wave to r_amp pin
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pub fn triangle(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const period = 44100 / self.soundnode.basefreq;
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const tp = (current_tick - (period * self.soundnode.totalPhase())) / period;
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const amp = @abs(2 * (2 * ( tp - @floor(tp + 0.5) ) )) - 1;
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const final_amp = gain * amp;
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self.soundnode.add_r_amp(final_amp);
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}
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// Produces a square wave to r_amp pin
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pub fn square(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const sin = math.sin(utility.corrected_tau * self.soundnode.basefreq * current_tick - self.soundnode.totalPhase() * utility.tau);
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if (sin > 0) {
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self.soundnode.add_r_amp(gain);
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} else {
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self.soundnode.add_r_amp(-gain);
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}
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}
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// Produces a sawtooth wave to r_amp pin
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pub fn sawtooth(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const period = 44100 / self.soundnode.basefreq;
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const tp = (current_tick - (period * self.soundnode.totalPhase())) / period;
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const amp = 2 * (tp - @floor(0.5+tp));
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const final_amp = gain * amp;
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self.soundnode.add_r_amp(final_amp);
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}
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// Produces a skewed sine wave to R_AMP pin
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// Skewness factor is taken from OUT8 pin
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pub fn skewsine(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const skew = self.soundnode.out8;
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var amp: f64 = 0;
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if (skew == 0) {
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amp = math.sin(utility.corrected_tau * self.soundnode.basefreq * current_tick - self.soundnode.totalPhase() * utility.tau);
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} else if (skew > 0) {
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const m = (utility.corrected_tau * self.soundnode.basefreq * current_tick - self.soundnode.totalPhase() * utility.tau);
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const sincos = skew * math.sin(m) / (1 - skew*math.cos(m));
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amp = (1/skew) * math.atan(sincos);
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} else if (skew < 0) {
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const m = (utility.corrected_tau * self.soundnode.basefreq * current_tick - self.soundnode.basephase * utility.tau);
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const sincos = skew * math.cos(m) / (1 + skew*math.sin(m));
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amp = (1/skew) * math.atan(sincos);
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}
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const final_amp = gain * amp;
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self.soundnode.add_r_amp(final_amp);
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}
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// Produces a pulse wave to r_amp pin
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// Uses OUT8 as pulse phase
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pub fn pulse(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const gain = self.soundnode.corrGain(self.operands[0]);
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const period = 44100 / self.soundnode.basefreq;
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const tp = (current_tick - (period * self.soundnode.totalPhase())) / period;
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const tp_detract = (current_tick - (period * (self.soundnode.out8 + self.soundnode.totalPhase()))) / period;
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const amp = 2 * (tp - @floor(0.5 + tp));
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const amp_detract = 2 * (tp_detract - @floor(0.5+tp_detract));
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const final_amp = gain * (amp - amp_detract);
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self.soundnode.add_r_amp(final_amp);
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}
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// Whitenoise
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// Seed is taken from OUT8
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//
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pub fn whitenoise(self: *Activity) void {
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const current_tick: f64 = @floatFromInt(self.soundnode.fab.current_tick);
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const seed = self.soundnode.out8;
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const gain = self.soundnode.corrGain(self.operands[0]);
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const w = (seed*current_tick) / math.sin(current_tick);
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const amp = (2 * (w - @floor(w))) - 1;
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const final_amp = gain * amp;
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self.soundnode.fab.add_r_amp(final_amp);
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} |