Replaced copyright magic numbers in intro.c with constants (#2035)

src/intro.c

@@ -112,6 +112,12 @@ extern const struct CompressedSpriteSheet gBattleAnimPicTable[];
 extern const struct CompressedSpritePalette gBattleAnimPaletteTable[];
 extern const struct SpriteTemplate gAncientPowerRockSpriteTemplate[];
 
+enum {
+    COPYRIGHT_INITIALIZE,
+    COPYRIGHT_START_FADE = 140,
+    COPYRIGHT_START_INTRO,
+};
+
 #define TAG_VOLBEAT   1500
 #define TAG_TORCHIC   1501
 #define TAG_MANECTRIC 1502
@@ -1067,7 +1073,7 @@ static u8 SetUpCopyrightScreen(void)
 {
     switch (gMain.state)
     {
-    case 0:
+    case COPYRIGHT_INITIALIZE:
         SetVBlankCallback(NULL);
         SetGpuReg(REG_OFFSET_BLDCNT, 0);
         SetGpuReg(REG_OFFSET_BLDALPHA, 0);
@@ -1101,7 +1107,7 @@ static u8 SetUpCopyrightScreen(void)
         gMain.state++;
         GameCubeMultiBoot_Main(&gMultibootProgramStruct);
         break;
-    case 140:
+    case COPYRIGHT_START_FADE:
         GameCubeMultiBoot_Main(&gMultibootProgramStruct);
         if (gMultibootProgramStruct.gcmb_field_2 != 1)
         {
@@ -1109,7 +1115,7 @@ static u8 SetUpCopyrightScreen(void)
             gMain.state++;
         }
         break;
-    case 141:
+    case COPYRIGHT_START_INTRO:
         if (UpdatePaletteFade())
             break;
         CreateTask(Task_Scene1_Load, 0);