Attempt to decompile sparksTick

src/include/game/data/data_020df0.h

@@ -131,8 +131,8 @@ extern u32 var8007e4a0;
 extern u32 var8007e4a4;
 extern struct explosiontype g_ExplosionTypes[NUM_EXPLOSIONTYPES];
 extern struct smoketype g_SmokeTypes[NUM_SMOKETYPES];
-extern u32 sparktable[];
-extern u32 var8007f0b8;
+extern struct sparktype g_SparkTypes[];
+extern s32 g_SparksAreActive;
 extern struct weatherdata *g_WeatherData;
 extern s32 var8007f0c4[4];
 extern u32 g_RainSpeedExtra;

src/include/gvars/gvars.h

@@ -689,11 +689,9 @@ extern u32 var800a3440;
 extern u32 var800a3444;
 extern u32 var800a3448;
 extern u32 var800a3488;
-extern u32 var800a34d0;
-
-extern u32 var800a3fc0; // likely a count of 800a3fc8
-extern struct gvars800a3fc8 var800a3fc8[];
-
+extern struct spark g_Sparks[100];
+extern u32 var800a3fc0; // likely a count of g_SparkGroups
+extern struct sparkgroup g_SparkGroups[];
 extern u32 var800a4130;
 extern u32 var800a4154;
 extern u32 var800a4158;

src/include/types.h

@@ -3101,11 +3101,28 @@ struct credit {
 	u16 text2;
 };
 
-struct gvars800a3fc8 {
-	u32 unk00;
-	u32 unk04;
-	u32 unk08;
-	u32 unk0c;
+struct sparktype {
+	u16 unk00;
+	s16 unk02;
+	u16 unk04;
+	u16 unk06;
+	u16 unk08;
+	u16 unk0a;
+	f32 weight;
+	u16 maxage;
+	u16 unk12;
+	u16 unk14;
+	u32 unk18;
+	u32 unk1c;
+	u32 unk20;
+	f32 decel;
+};
+
+struct sparkgroup {
+	s32 type;
+	s32 numsparks;
+	s32 age;
+	s32 startindex; // index into g_Sparks
 	u32 unk10;
 	u32 unk14;
 	u32 unk18;
@@ -3113,6 +3130,12 @@ struct gvars800a3fc8 {
 	u32 unk20;
 };
 
+struct spark {
+	struct coord pos;
+	struct coord speed;
+	s32 ttl; // time to live (number of ticks remaining)
+};
+
 struct roombitfield {
 	u8 a : 4;
 	u8 b : 4;