279 lines
8.3 KiB
C
279 lines
8.3 KiB
C
#include "global.h"
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#include "walda_phrase.h"
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#include "string_util.h"
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#include "event_data.h"
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#include "naming_screen.h"
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#include "main.h"
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#include "text.h"
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#include "new_game.h"
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#include "overworld.h"
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#include "pokemon_storage_system.h"
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#include "field_screen_effect.h"
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extern const u8 gText_Peekaboo[];
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static void CB2_HandleGivenWaldaPhrase(void);
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static u32 GetWaldaPhraseInputCase(u8 *);
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static bool32 TryCalculateWallpaper(u16 *, u16 *, u8 *, u8 *, u16, u8 *);
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static void SetWallpaperDataFromLetter(u8 *, u8 *, u32, u32, u32);
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static u32 GetWallpaperDataBits(u8 *, u32, u32);
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static void RotateWallpaperDataLeft(u8 *, s32, s32);
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static void MaskWallpaperData(u8 *, u32, u8);
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// There are 32 (2^5) unique letters allowed in a successful phrase for Walda.
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#define BITS_PER_LETTER 5
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// The letters allowed in a successful phrase for Walda
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// All vowels are excluded, as well as X/x, Y/y, l, r, t, v, w, and z.
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static const u8 sWaldaLettersTable[1 << BITS_PER_LETTER] =
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{
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CHAR_B, CHAR_C, CHAR_D, CHAR_F, CHAR_G, CHAR_H, CHAR_J, CHAR_K, CHAR_L, CHAR_M, CHAR_N, CHAR_P, CHAR_Q, CHAR_R, CHAR_S, CHAR_T, CHAR_V, CHAR_W, CHAR_Z,
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CHAR_b, CHAR_c, CHAR_d, CHAR_f, CHAR_g, CHAR_h, CHAR_j, CHAR_k, CHAR_m, CHAR_n, CHAR_p, CHAR_q, CHAR_s
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};
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enum
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{
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PHRASE_CHANGED,
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PHRASE_NO_CHANGE,
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PHRASE_EMPTY
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};
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u16 TryBufferWaldaPhrase(void)
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{
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if (IsWaldaPhraseEmpty())
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return FALSE;
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StringCopy(gStringVar1, GetWaldaPhrasePtr());
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return TRUE;
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}
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void DoWaldaNamingScreen(void)
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{
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StringCopy(gStringVar2, GetWaldaPhrasePtr());
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DoNamingScreen(NAMING_SCREEN_WALDA, gStringVar2, 0, 0, 0, CB2_HandleGivenWaldaPhrase);
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}
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static void CB2_HandleGivenWaldaPhrase(void)
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{
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gSpecialVar_0x8004 = GetWaldaPhraseInputCase(gStringVar2);
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switch (gSpecialVar_0x8004)
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{
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case PHRASE_EMPTY:
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// If saved phrase is also empty, set default phrase
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// Otherwise keep saved phrase
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if (IsWaldaPhraseEmpty())
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SetWaldaPhrase(gText_Peekaboo);
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else
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gSpecialVar_0x8004 = PHRASE_NO_CHANGE;
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break;
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case PHRASE_CHANGED:
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SetWaldaPhrase(gStringVar2);
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break;
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case PHRASE_NO_CHANGE:
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break;
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}
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StringCopy(gStringVar1, GetWaldaPhrasePtr());
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gFieldCallback = FieldCB_ContinueScriptHandleMusic;
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SetMainCallback2(CB2_ReturnToField);
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}
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static u32 GetWaldaPhraseInputCase(u8 *inputPtr)
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{
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// No input given
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if (inputPtr[0] == EOS)
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return PHRASE_EMPTY;
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// Input given is the same as saved phrase
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if (StringCompare(inputPtr, GetWaldaPhrasePtr()) == 0)
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return PHRASE_NO_CHANGE;
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// Input is new phrase
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return PHRASE_CHANGED;
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}
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u16 TryGetWallpaperWithWaldaPhrase(void)
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{
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u16 backgroundClr, foregroundClr;
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u8 patternId, iconId;
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u16 trainerId = GetTrainerId(gSaveBlock2Ptr->playerTrainerId);
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gSpecialVar_Result = TryCalculateWallpaper(&backgroundClr, &foregroundClr, &iconId, &patternId, trainerId, GetWaldaPhrasePtr());
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if (gSpecialVar_Result)
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{
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SetWaldaWallpaperPatternId(patternId);
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SetWaldaWallpaperIconId(iconId);
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SetWaldaWallpaperColors(backgroundClr, foregroundClr);
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}
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SetWaldaWallpaperLockedOrUnlocked(gSpecialVar_Result);
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return (bool8)gSpecialVar_Result;
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}
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static u8 GetLetterTableId(u8 letter)
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{
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s32 i;
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for (i = 0; i < ARRAY_COUNT(sWaldaLettersTable); i++)
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{
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if (sWaldaLettersTable[i] == letter)
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return i;
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}
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return ARRAY_COUNT(sWaldaLettersTable);
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}
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// Attempts to generate a wallpaper based on the given trainer id and phrase.
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// Returns TRUE if successful and sets the wallpaper results to the given pointers.
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// Returns FALSE if no wallpaper was generated (Walda "didn't like" the phrase).
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// A 9-byte array is used to calculate the wallpaper's data.
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// The elements of this array are defined below.
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#define BG_COLOR_LO data[0]
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#define BG_COLOR_HI data[1]
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#define FG_COLOR_LO data[2]
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#define FG_COLOR_HI data[3]
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#define ICON_ID data[4]
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#define PATTERN_ID data[5]
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#define TID_CHECK_HI data[6]
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#define TID_CHECK_LO data[7]
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#define KEY data[8]
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#define NUM_WALLPAPER_DATA_BYTES 9
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#define TO_BIT_OFFSET(i) (3 + (8 * (i))) // Convert a position in the phrase to a bit number into the wallpaper data array
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static bool32 TryCalculateWallpaper(u16* backgroundClr, u16 *foregroundClr, u8 *iconId, u8 *patternId, u16 trainerId, u8 *phrase)
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{
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s32 i;
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ALIGNED(2) u8 data[NUM_WALLPAPER_DATA_BYTES];
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u8 charsByTableId[WALDA_PHRASE_LENGTH];
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u16 *ptr;
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// Reject any phrase that does not use the full length
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if (StringLength(phrase) != WALDA_PHRASE_LENGTH)
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return FALSE;
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// Reject any phrase that uses characters not in sWaldaLettersTable
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for (i = 0; i < WALDA_PHRASE_LENGTH; i++)
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{
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charsByTableId[i] = GetLetterTableId(phrase[i]);
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if (charsByTableId[i] == ARRAY_COUNT(sWaldaLettersTable))
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return FALSE;
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}
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// Use the given phrase to populate the wallpaper data array
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// The data array is 9 bytes (72 bits) long, and each letter contributes to 5 bits of the array
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// Because the phrase is 15 letters long there are 75 bits from the phrase to distribute
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// Therefore the last letter contributes to the last 2 bits of the array, and the remaining 3 bits wrap around
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for (i = 0; i < WALDA_PHRASE_LENGTH - 1; i++)
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SetWallpaperDataFromLetter(data, charsByTableId, BITS_PER_LETTER * i, TO_BIT_OFFSET(i), BITS_PER_LETTER);
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// Do first 2 bits of the last letter
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SetWallpaperDataFromLetter(data, charsByTableId, BITS_PER_LETTER * (WALDA_PHRASE_LENGTH - 1), TO_BIT_OFFSET(WALDA_PHRASE_LENGTH - 1), 2);
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// Check the first 3 bits of the data array against the remaining 3 bits of the last letter
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// Reject the phrase if they are not already the same
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if (GetWallpaperDataBits(data, 0, 3) != GetWallpaperDataBits(charsByTableId, TO_BIT_OFFSET(WALDA_PHRASE_LENGTH - 1) + 2, 3))
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return FALSE;
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// Perform some relatively arbitrary changes to the wallpaper data using the last byte (KEY)
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RotateWallpaperDataLeft(data, NUM_WALLPAPER_DATA_BYTES, 21);
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RotateWallpaperDataLeft(data, NUM_WALLPAPER_DATA_BYTES - 1, KEY & 0xF);
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MaskWallpaperData(data, NUM_WALLPAPER_DATA_BYTES - 1, KEY >> 4);
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// Reject the results of any phrase that are 'incompatible' with the player's trainer id
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if (TID_CHECK_HI != (BG_COLOR_LO ^ FG_COLOR_LO ^ ICON_ID ^ (trainerId >> 8)))
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return FALSE;
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if (TID_CHECK_LO != (BG_COLOR_HI ^ FG_COLOR_HI ^ PATTERN_ID ^ (trainerId & 0xFF)))
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return FALSE;
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// Successful phrase, save resulting wallpaper
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ptr = (u16*) &BG_COLOR_LO;
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*backgroundClr = *ptr;
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ptr = (u16*) &FG_COLOR_LO;
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*foregroundClr = *ptr;
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*iconId = ICON_ID;
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*patternId = PATTERN_ID;
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return TRUE;
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}
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static void RotateWallpaperDataLeft(u8 *data, s32 size, s32 numShifts)
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{
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s32 i, j;
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u8 temp1, temp2;
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for (i = numShifts - 1; i != -1; i--)
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{
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temp1 = (data[0] & (1 << 7)) >> 7;
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for (j = size - 1; j >= 0; j--)
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{
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temp2 = (data[j] & (1 << 7)) >> 7;
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data[j] <<= 1;
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data[j] |= temp1;
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temp1 = temp2;
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}
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}
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}
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static void MaskWallpaperData(u8 *data, u32 size, u8 mask)
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{
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u32 i;
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mask |= (mask << 4);
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for (i = 0; i < size; i++)
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data[i] ^= mask;
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}
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static bool8 GetWallpaperDataBit(u8 *data, u32 bitNum)
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{
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u32 i = bitNum / 8;
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u32 flag = (1 << 7) >> (bitNum % 8);
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return (data[i] & flag) != 0;
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}
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static void SetWallpaperDataBit(u8 *data, u32 bitNum)
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{
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u32 i = bitNum / 8;
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u8 flag = (1 << 7) >> (bitNum % 8);
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data[i] |= flag;
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}
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static void ClearWallpaperDataBit(u8 *data, u32 bitNum)
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{
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u32 i = bitNum / 8;
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u8 mask = ~((1 << 7) >> (bitNum % 8));
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data[i] &= mask;
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}
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static void SetWallpaperDataFromLetter(u8 *data, u8 *letterTableIds, u32 setOffset, u32 getOffset, u32 numBits)
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{
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u32 i;
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for (i = 0; i < numBits; i++)
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{
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if (GetWallpaperDataBit(letterTableIds, getOffset + i))
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SetWallpaperDataBit(data, setOffset + i);
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else
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ClearWallpaperDataBit(data, setOffset + i);
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}
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}
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static u32 GetWallpaperDataBits(u8 *data, u32 offset, u32 numBits)
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{
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u32 bits, i;
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for (bits = 0, i = 0; i < numBits; i++)
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{
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bits <<= 1;
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bits |= GetWallpaperDataBit(data, offset + i);
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}
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return bits;
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}
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