Style: Partially apply clang-tidy's `cppcoreguidelines-pro-type-member-init`

Didn't commit all the changes where it wants to initialize a struct
with `{}`. Should be reviewed in a separate PR.

Option `IgnoreArrays` enabled for now to be conservative, can be
disabled to see if it proposes more useful changes.

Also fixed manually a handful of other missing initializations / moved
some from constructors.

4 files changed, 16 insertions, 19 deletions

diff --git a/servers/audio/effects/audio_effect_stereo_enhance.cpp b/servers/audio/effects/audio_effect_stereo_enhance.cpp
index c81efc55e2..7bb62bcbed 100644
--- a/servers/audio/effects/audio_effect_stereo_enhance.cpp
+++ b/servers/audio/effects/audio_effect_stereo_enhance.cpp
@@ -29,7 +29,9 @@
 /*************************************************************************/
 
 #include "audio_effect_stereo_enhance.h"
+
 #include "servers/audio_server.h"
+
 void AudioEffectStereoEnhanceInstance::process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) {
 	float intensity = base->pan_pullout;
 	bool surround_mode = base->surround > 0;
@@ -140,8 +142,4 @@ void AudioEffectStereoEnhance::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "surround", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_surround", "get_surround");
 }
 
-AudioEffectStereoEnhance::AudioEffectStereoEnhance() {
-	pan_pullout = 1;
-	time_pullout = 0;
-	surround = 0;
-}
+AudioEffectStereoEnhance::AudioEffectStereoEnhance() {}
diff --git a/servers/audio/effects/audio_effect_stereo_enhance.h b/servers/audio/effects/audio_effect_stereo_enhance.h
index 1f93d1cf9f..30ea11f625 100644
--- a/servers/audio/effects/audio_effect_stereo_enhance.h
+++ b/servers/audio/effects/audio_effect_stereo_enhance.h
@@ -28,8 +28,8 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#ifndef AUDIOEFFECTSTEREOENHANCE_H
-#define AUDIOEFFECTSTEREOENHANCE_H
+#ifndef AUDIO_EFFECT_STEREO_ENHANCE_H
+#define AUDIO_EFFECT_STEREO_ENHANCE_H
 
 #include "servers/audio/audio_effect.h"
 
@@ -45,8 +45,8 @@ class AudioEffectStereoEnhanceInstance : public AudioEffectInstance {
 	};
 
 	float *delay_ringbuff = nullptr;
-	unsigned int ringbuff_pos;
-	unsigned int ringbuff_mask;
+	unsigned int ringbuff_pos = 0;
+	unsigned int ringbuff_mask = 0;
 
 public:
 	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
@@ -58,11 +58,11 @@ class AudioEffectStereoEnhance : public AudioEffect {
 	GDCLASS(AudioEffectStereoEnhance, AudioEffect);
 
 	friend class AudioEffectStereoEnhanceInstance;
-	float volume_db;
+	float volume_db = 0.0f;
 
-	float pan_pullout;
-	float time_pullout;
-	float surround;
+	float pan_pullout = 1.0f;
+	float time_pullout = 0.0f;
+	float surround = 0.0f;
 
 protected:
 	static void _bind_methods();
@@ -82,4 +82,4 @@ public:
 	AudioEffectStereoEnhance();
 };
 
-#endif // AUDIOEFFECTSTEREOENHANCE_H
+#endif // AUDIO_EFFECT_STEREO_ENHANCE_H
diff --git a/servers/audio/effects/reverb.cpp b/servers/audio/effects/reverb.cpp
index 4b5b9ab79f..adfd648514 100644
--- a/servers/audio/effects/reverb.cpp
+++ b/servers/audio/effects/reverb.cpp
@@ -28,8 +28,6 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-// Author: Juan Linietsky <reduzio@gmail.com>, (C) 2006
-
 #include "reverb.h"
 
 #include "core/math/math_funcs.h"
diff --git a/servers/audio/effects/reverb.h b/servers/audio/effects/reverb.h
index de25e8c52b..c9602c5b5a 100644
--- a/servers/audio/effects/reverb.h
+++ b/servers/audio/effects/reverb.h
@@ -77,10 +77,11 @@ private:
 	AllPass allpass[MAX_ALLPASS];
 	float *input_buffer = nullptr;
 	float *echo_buffer = nullptr;
-	int echo_buffer_size;
-	int echo_buffer_pos;
+	int echo_buffer_size = 0;
+	int echo_buffer_pos = 0;
 
-	float hpf_h1, hpf_h2 = 0;
+	float hpf_h1 = 0.0f;
+	float hpf_h2 = 0.0f;
 
 	struct Parameters {
 		float room_size;