initial commit, 4.5 stable

servers/audio/effects/audio_effect_phaser.h

@@ -0,0 +1,103 @@
+/**************************************************************************/
+/*  audio_effect_phaser.h                                                 */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* 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.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "servers/audio/audio_effect.h"
+
+class AudioEffectPhaser;
+
+class AudioEffectPhaserInstance : public AudioEffectInstance {
+	GDCLASS(AudioEffectPhaserInstance, AudioEffectInstance);
+	friend class AudioEffectPhaser;
+	Ref<AudioEffectPhaser> base;
+
+	float phase;
+	AudioFrame h;
+
+	class AllpassDelay {
+		float a, h;
+
+	public:
+		_ALWAYS_INLINE_ void delay(float d) {
+			a = (1.f - d) / (1.f + d);
+		}
+
+		_ALWAYS_INLINE_ float update(float s) {
+			float y = s * -a + h;
+			h = y * a + s;
+			return y;
+		}
+
+		AllpassDelay() {
+			a = 0;
+			h = 0;
+		}
+	};
+
+	AllpassDelay allpass[2][6];
+
+public:
+	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
+};
+
+class AudioEffectPhaser : public AudioEffect {
+	GDCLASS(AudioEffectPhaser, AudioEffect);
+
+	friend class AudioEffectPhaserInstance;
+	float range_min;
+	float range_max;
+	float rate;
+	float feedback;
+	float depth;
+
+protected:
+	static void _bind_methods();
+
+public:
+	Ref<AudioEffectInstance> instantiate() override;
+
+	void set_range_min_hz(float p_hz);
+	float get_range_min_hz() const;
+
+	void set_range_max_hz(float p_hz);
+	float get_range_max_hz() const;
+
+	void set_rate_hz(float p_hz);
+	float get_rate_hz() const;
+
+	void set_feedback(float p_fbk);
+	float get_feedback() const;
+
+	void set_depth(float p_depth);
+	float get_depth() const;
+
+	AudioEffectPhaser();
+};