mirror of
https://github.com/curioustorvald/Terrarum.git
synced 2026-06-17 22:14:05 +09:00
79 lines
2.5 KiB
Kotlin
79 lines
2.5 KiB
Kotlin
package net.torvald.terrarum.audio.dsp
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import com.badlogic.gdx.graphics.g2d.SpriteBatch
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import com.jme3.math.FastMath
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import net.torvald.terrarum.App
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import net.torvald.terrarum.audio.TerrarumAudioMixerTrack
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import net.torvald.terrarum.audio.linToLogPerc
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import net.torvald.terrarum.ui.BasicDebugInfoWindow
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import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD
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import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD2
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import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
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import net.torvald.terrarum.ui.Toolkit
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/**
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* Created by minjaesong on 2023-11-17.
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*/
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class Lowpass(cutoff0: Float): TerrarumAudioFilter() {
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var cutoff = cutoff0.toDouble(); private set
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private var alpha: Float = 0f
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init {
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setCutoff(cutoff0)
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}
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fun setCutoff(cutoff: Float) {
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val RC: Float = 1f / (cutoff * FastMath.TWO_PI)
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val dt: Float = 1f / TerrarumAudioMixerTrack.SAMPLING_RATEF
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alpha = dt / (RC + dt)
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this.cutoff = cutoff.toDouble()
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}
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fun setCutoff(cutoff: Double) {
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// println("LP Cutoff: $cutoff")
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val RC: Double = 1.0 / (cutoff * Math.PI * 2.0)
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val dt: Double = 1.0 / TerrarumAudioMixerTrack.SAMPLING_RATEF
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alpha = (dt / (RC + dt)).toFloat()
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this.cutoff = cutoff
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}
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val in0 = FloatArray(2)
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val out0 = FloatArray(2)
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override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
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for (ch in outbuf.indices) {
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val out = outbuf[ch]
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val inn = inbuf[ch]
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out[0] = out0[ch] + alpha * (inn[0] - out0[ch])
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for (i in 1 until outbuf[ch].size) {
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out[i] = out[i-1] + alpha * (inn[i] - out[i-1])
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}
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out0[ch] = outbuf[ch].last()
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in0[ch] = inbuf[ch].last()
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}
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}
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override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {
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val perc = linToLogPerc(cutoff, 24.0, 24000.0).toFloat()
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batch.color = COL_METER_GRAD2
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Toolkit.fillArea(batch, x.toFloat(), y.toFloat(), BasicDebugInfoWindow.STRIP_W * perc, 14f)
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batch.color = COL_METER_GRAD
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Toolkit.fillArea(batch, x.toFloat(), y+14f, BasicDebugInfoWindow.STRIP_W * perc, 2f)
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batch.color = FILTER_NAME_ACTIVE
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App.fontSmallNumbers.draw(batch, "F:${cutoff.toInt()}", x+3f, y+1f)
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}
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override val debugViewHeight = 16
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override fun copyParamsFrom(other: TerrarumAudioFilter) {
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if (other is Lowpass) {
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setCutoff(other.cutoff)
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}
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}
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} |