bandpass dsp

src/net/torvald/terrarum/audio/dsp/Bandpass.kt

@@ -0,0 +1,48 @@
+package net.torvald.terrarum.audio.dsp
+
+import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import net.torvald.terrarum.App
+import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
+
+/**
+ * Created by minjaesong on 2024-12-22.
+ */
+class Bandpass(cutoffLo0: Float, cutoffHi0: Float): TerrarumAudioFilter() {
+
+    private val LP = Lowpass(cutoffHi0)
+    private val HP = Highpass(cutoffLo0)
+
+    private var midbufLen = App.audioBufferSize
+    private var midbuf: List<FloatArray> = listOf(FloatArray(midbufLen), FloatArray(midbufLen))
+
+    override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
+        if (inbuf[0].size != midbufLen) {
+            midbufLen = inbuf[0].size
+            midbuf = listOf(FloatArray(midbufLen), FloatArray(midbufLen))
+        }
+
+        HP.thru(inbuf, midbuf)
+        LP.thru(midbuf, outbuf)
+    }
+
+    override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {
+//        val perc = linToLogPerc(cutoff, 24.0, 24000.0).toFloat()
+//        batch.color = COL_METER_GRAD2
+//        Toolkit.fillArea(batch, x.toFloat(), y.toFloat(), BasicDebugInfoWindow.STRIP_W * perc, 14f)
+//        batch.color = COL_METER_GRAD
+//        Toolkit.fillArea(batch, x.toFloat(), y+14f, BasicDebugInfoWindow.STRIP_W * perc, 2f)
+
+        batch.color = FILTER_NAME_ACTIVE
+        App.fontSmallNumbers.draw(batch, "FL:${HP.cutoff.toInt()}", x+3f, y+1f)
+        App.fontSmallNumbers.draw(batch, "FH:${LP.cutoff.toInt()}", x+3f, y+17f)
+    }
+
+    override val debugViewHeight = 32
+
+    override fun copyParamsFrom(other: TerrarumAudioFilter) {
+        if (other is Bandpass) {
+            other.LP.setCutoff(this.LP.cutoff)
+            other.HP.setCutoff(this.HP.cutoff)
+        }
+    }
+}