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// Augmented Audio: Audio libraries and applications
// Copyright (c) 2022 Pedro Tacla Yamada
//
// The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// TODO - Add smoothstep as it's very useful
// https://en.wikipedia.org/wiki/Smoothstep

static TWO_PI: f32 = std::f32::consts::PI * 2.0;

pub fn sine_generator(phase: f32) -> f32 {
    (phase * TWO_PI).sin()
}

pub fn square_generator(phase: f32) -> f32 {
    static LIMIT: f32 = 0.5;

    if (phase % 1.0) < LIMIT {
        1.0
    } else {
        -1.0
    }
}

pub fn saw_generator(phase: f32) -> f32 {
    (1.0 - (phase % 1.0)) * 2.0 - 1.0
}