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describe how ep3 card drop rates actually work

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This commit is contained in:
Martin Michelsen
2023-09-01 10:49:15 -07:00
parent 2eda283f8f
commit 8449a6d21a
2 changed files with 135 additions and 21 deletions
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src/Episode3/DataIndexes.hh
+70 -11
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@@ -523,6 +523,7 @@ struct CardDefinition {
// stored big-endian here, so there's a helper function (card_class()) that
// returns a usable CardClass enum value.
/* 0096 */ be_uint16_t be_card_class;
// The two fields of this array seem to always contain the same value, and
// are always 0 for non-assist cards and nonzero for assists. Each assist
// card has a unique value here and no effects, though the server ignores
@@ -533,16 +534,69 @@ struct CardDefinition {
// determine assist cards' effects (see e.g. Skip Draw / Skip Move, Dice
// Fever / Dice Fever +, Reverse Card / Rich +).
/* 0098 */ parray<be_uint16_t, 2> assist_effect;
// Drop rates are decimal-encoded with the following fields:
// - rate % 10 (that is, the lowest decimal place) specifies the required game
// mode. 0 means any mode, 1 means offline only, 2 means 1P free-battle, 3
// means 2P+ free battle, 4 means story mode.
// mode. 0 means any mode, 1 means offline story mode, 2 means 1P free
// battle, 3 means 2P+ free battle (specifically, PvP - two humans vs. two
// COMs counts as 1P free battle), 4 means online mode, 5 means tournament.
// Some cards have this field set to 6, which isn't a valid game mode; it
// seems Sega used this as a way to make sure the drop rate never applies.
// - (rate / 10) % 100 (that is, the tens and hundreds decimal places) specify
// something else, but it's not clear what exactly.
// - rate / 1000 (the thousands decimal place) specifies the level class
// required to get this drop.
// - rate / 10000 (the ten-thousands decimal place) must be either 0, 1, or 2,
// but it's not clear yet what each value means.
// the environment number + 1. For example, if this field contains 5, then
// this drop only applies if the battle took place at Molae Venti
// (environment number 4). If this field is zero, the drop applies
// regardless of where the battle took place.
// - rate / 1000 (the thousands decimal place) specifies the rarity class.
// This can be any number in the range [0, 9], and affects how likely the
// card is to appear based on the player's level. See below for details.
// - rate / 10000 (the ten-thousands decimal place) specifies if the drop rate
// applies only if the player used a Hunters deck (1), only if they used an
// Arkz deck (2), or if they used any deck (0).
// When determining which cards to drop, the game first checks the drop rate
// fields on all cards. For each drop rate that applies, the game adds the
// card ID into an appropriate bucket based on the rarity class. (If both drop
// rates for a card apply, the card ID is added twice.) The player's level
// class is then computed according to the following table:
// 1 2 3 4 5 6 7 8 9 10
// CLvOff 1-2 3-4 5-9 10-14 15-19 20-25 26-29 30-39 40-49 50+
// CLvOn 1-2 3-4 5-10 11-16 17-23 24-32 33-39 40-49 50-99 100+
// For the purposes of this computation, the player's level is used by default
// (CLvOn or CLvOff), but the map may override it - see win_level_override and
// loss_level_override in MapDefinition. This specifies which row in the
// following tables will be used.
// Finally, cards are chosen from the buckets with a weighted distribution
// according to these tables (row is player's level class, column is card's
// rarity class):
// Offline
// 1 2 3 4 5 6 7 8 9 10
// 1 => 8000 2000 50
// 2 => 6000 3500 500 50
// 3 => 4500 3500 1500 400 100
// 4 => 3000 3000 2500 1000 450 50
// 5 => 2000 2600 2750 2000 500 100 50
// 6 => 1900 2200 2500 2100 830 350 100 20
// 7 => 1900 2000 2000 2000 1000 500 500 100
// 8 => 160000 160000 190000 190000 130000 100000 50000 19999 1
// 9 => 120000 120000 150000 160000 150000 150000 100000 49989 10 1
// 10 => 120000 120000 130000 150000 160000 150000 100000 69965 30 5
// Online
// 1 2 3 4 5 6 7 8 9 10
// 1 => 8000 2000 50
// 2 => 6000 3500 500 20
// 3 => 4500 4000 1500 200
// 4 => 3500 3500 2300 700 20
// 5 => 2700 2800 2500 1500 500 10
// 6 => 2300 2300 2300 1900 900 300 1
// 7 => 1995 2100 2100 2100 1000 700 5
// 8 => 1789 2100 2100 2100 1100 800 10 1
// 9 => 14620 20000 21000 22000 13000 9000 300 80
// 10 => 133997 190000 200000 200000 150000 120000 5000 1000 2 1
// These values are all relative to other values in the same row. For example,
// if your character is in level class 1, you'll get cards of rarity class 1
// about 80% of the time, cards of rarity class 2 about 20% of the time, and
// cards of rarity class 3 about 0.5% of the time. (The actual probabilities
// are 8000/10050, 2000/10050, and 50/10050.)
// The drop rates are completely ignored if any of the following are true
// (which means the card can never be found in a normal post-battle draw):
// - type is SC_HUNTERS or SC_ARKZ
@@ -551,6 +605,7 @@ struct CardDefinition {
// - cannot_drop is 1 (specifically 1; other nonzero values here don't
// prevent the card from appearing in post-battle draws)
/* 009C */ parray<be_uint16_t, 2> drop_rates;
/* 00A0 */ ptext<char, 0x14> en_name;
/* 00B4 */ ptext<char, 0x0B> jp_short_name;
/* 00BF */ ptext<char, 0x08> en_short_name;
@@ -913,8 +968,12 @@ struct MapDefinition { // .mnmd format; also the format of (decompressed) quests
/* 59B0 */ parray<be_uint16_t, 0x10> reward_card_ids;
/* 59D0 */ be_uint32_t unknown_a9_a;
/* 59D4 */ be_uint32_t unknown_a9_b;
// These fields appear to be used for the purpose of determining cards to drop
// after the battle is complete. If either is negative, the player's actual
// CLv is used instead.
/* 59D0 */ be_int32_t win_level_override;
/* 59D4 */ be_int32_t loss_level_override;
/* 59D8 */ be_uint16_t unknown_a9_c;
/* 59DA */ be_uint16_t unknown_a9_d;
@@ -1013,8 +1072,8 @@ struct MapDefinitionTrial {
/* 2758 */ ptext<char, 0x190> dispatch_message;
/* 28E8 */ parray<parray<MapDefinition::DialogueSet, 8>, 3> dialogue_sets;
/* 4148 */ parray<be_uint16_t, 0x10> reward_card_ids;
/* 4168 */ be_uint32_t unknown_a9_a;
/* 416C */ be_uint32_t unknown_a9_b;
/* 4168 */ be_uint32_t win_level_override;
/* 416C */ be_uint32_t loss_level_override;
/* 4170 */ be_uint16_t unknown_a9_c;
/* 4172 */ be_uint16_t unknown_a9_d;
/* 4174 */ uint8_t unknown_a10;