Fix many asan and ubsan reported issues

This allows most demos to run without any ubsan or asan errors. There
are still some things in thirdpart/ and some things in AudioServer that
needs a look but this fixes a lot of issues. This should help debug less
obvious issues, hopefully.

This fixes #25217 and fixes #25218

3 files changed, 40 insertions, 20 deletions

diff --git a/scene/animation/animation_player.h b/scene/animation/animation_player.h
index 175072edcf..9bba848298 100644
--- a/scene/animation/animation_player.h
+++ b/scene/animation/animation_player.h
@@ -114,10 +114,12 @@ private:
 			Variant value_accum;
 			uint64_t accum_pass;
 			Variant capture;
-			PropertyAnim() {
-				accum_pass = 0;
-				object = NULL;
-			}
+
+			PropertyAnim() :
+					owner(NULL),
+					special(SP_NONE),
+					object(NULL),
+					accum_pass(0) {}
 		};
 
 		Map<StringName, PropertyAnim> property_anim;
@@ -129,25 +131,28 @@ private:
 			float bezier_accum;
 			Object *object;
 			uint64_t accum_pass;
-			BezierAnim() {
-				accum_pass = 0;
-				bezier_accum = 0;
-				object = NULL;
-			}
+
+			BezierAnim() :
+					owner(NULL),
+					bezier_accum(0.0),
+					object(NULL),
+					accum_pass(0) {}
 		};
 
 		Map<StringName, BezierAnim> bezier_anim;
 
-		TrackNodeCache() {
-			skeleton = NULL;
-			spatial = NULL;
-			node = NULL;
-			accum_pass = 0;
-			bone_idx = -1;
-			node_2d = NULL;
-			audio_playing = false;
-			animation_playing = false;
-		}
+		TrackNodeCache() :
+				id(0),
+				node(NULL),
+				spatial(NULL),
+				node_2d(NULL),
+				skeleton(NULL),
+				bone_idx(-1),
+				accum_pass(0),
+				audio_playing(false),
+				audio_start(0.0),
+				audio_len(0.0),
+				animation_playing(false) {}
 	};
 
 	struct TrackNodeCacheKey {
diff --git a/scene/animation/animation_tree_player.h b/scene/animation/animation_tree_player.h
index 12e514f7d5..9ec6325969 100644
--- a/scene/animation/animation_tree_player.h
+++ b/scene/animation/animation_tree_player.h
@@ -109,6 +109,14 @@ private:
 		Variant value;
 
 		bool skip;
+
+		Track() :
+				id(0),
+				object(NULL),
+				spatial(NULL),
+				skeleton(NULL),
+				bone_idx(-1),
+				skip(false) {}
 	};
 
 	typedef Map<TrackKey, Track> TrackMap;
diff --git a/scene/resources/environment.cpp b/scene/resources/environment.cpp
index a57b7bbb42..d09ac0ee6c 100644
--- a/scene/resources/environment.cpp
+++ b/scene/resources/environment.cpp
@@ -1291,7 +1291,14 @@ void Environment::_bind_methods() {
 	BIND_ENUM_CONSTANT(SSAO_QUALITY_HIGH);
 }
 
-Environment::Environment() {
+Environment::Environment() :
+		bg_mode(BG_CLEAR_COLOR),
+		tone_mapper(TONE_MAPPER_LINEAR),
+		ssao_blur(SSAO_BLUR_DISABLED),
+		ssao_quality(SSAO_QUALITY_LOW),
+		glow_blend_mode(GLOW_BLEND_MODE_ADDITIVE),
+		dof_blur_far_quality(DOF_BLUR_QUALITY_LOW),
+		dof_blur_near_quality(DOF_BLUR_QUALITY_LOW) {
 
 	environment = VS::get_singleton()->environment_create();