Decomp and doc clear_save_data_screen

1 files changed, 224 insertions, 0 deletions

diff --git a/src/clear_save_data_screen.c b/src/clear_save_data_screen.c
new file mode 100644
index 000000000..5485e8da9
--- /dev/null
+++ b/src/clear_save_data_screen.c
@@ -0,0 +1,224 @@
+#include "global.h"
+#include "gflib.h"
+#include "menu.h"
+#include "save.h"
+#include "strings.h"
+#include "task.h"
+#include "text_window.h"
+#include "constants/songs.h"
+
+struct ClearSaveDataStruct {
+    u8 unk0;
+    u8 unk1;
+    u8 unk2;
+};
+
+static EWRAM_DATA struct ClearSaveDataStruct * sClearSaveDataState = NULL;
+
+static void Task_DrawClearSaveDataScreen(u8 taskId);
+static void Task_HandleYesNoMenu(u8 taskId);
+static void Task_CleanUpAndSoftReset(u8 taskId);
+static void CB2_Sub_SaveClearScreen_Init(void);
+static void SaveClearScreen_GpuInit(void);
+
+static const struct BgTemplate sBgTemplates[] = {
+    {
+        .bg = 0,
+        .charBaseIndex = 0,
+        .mapBaseIndex = 31,
+        .screenSize = 0,
+        .paletteMode = 0,
+        .priority = 0,
+        .baseTile = 0x000
+    }
+};
+
+static const struct WindowTemplate sWindowTemplates[] = {
+    {
+        .bg = 0,
+        .tilemapLeft = 3,
+        .tilemapTop = 5,
+        .width = 6,
+        .height = 4,
+        .paletteNum = 0xF,
+        .baseBlock = 0x00A
+    }, {
+        .bg = 0,
+        .tilemapLeft = 3,
+        .tilemapTop = 15,
+        .width = 23,
+        .height = 4,
+        .paletteNum = 0xF,
+        .baseBlock = 0x022
+    }, DUMMY_WIN_TEMPLATE
+};
+
+static const u8 sTextColor[] = {
+    TEXT_COLOR_WHITE,
+    TEXT_COLOR_DARK_GREY,
+    TEXT_COLOR_LIGHT_GREY
+};
+
+static void CB2_RunClearSaveDataScreen(void)
+{
+    RunTasks();
+    AnimateSprites();
+    BuildOamBuffer();
+    UpdatePaletteFade();
+}
+
+static void VBlankCB_WaitYesNo(void)
+{
+    LoadOam();
+    ProcessSpriteCopyRequests();
+    TransferPlttBuffer();
+}
+
+void CB2_SaveClearScreen_Init(void)
+{
+    sClearSaveDataState = AllocZeroed(sizeof(struct ClearSaveDataStruct));
+    sClearSaveDataState->unk1 = 0;
+    sClearSaveDataState->unk0 = 0;
+    sClearSaveDataState->unk2 = 0;
+    CB2_Sub_SaveClearScreen_Init();
+    CreateTask(Task_DrawClearSaveDataScreen, 0);
+    SetMainCallback2(CB2_RunClearSaveDataScreen);
+}
+
+static void Task_DrawClearSaveDataScreen(u8 taskId)
+{
+    switch (sClearSaveDataState->unk1)
+    {
+    case 0:
+        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 16, RGB_BLACK);
+        break;
+    case 1:
+        if (gPaletteFade.active)
+            return;
+        SetVBlankCallback(NULL);
+        break;
+    case 2:
+        SaveClearScreen_GpuInit();
+        break;
+    case 3:
+        TextWindow_SetStdFrame0_WithPal(0, 0x001, 0xF0);
+        TextWindow_SetStdFrame0_WithPal(1, 0x001, 0xF0);
+        break;
+    case 4:
+        DrawStdFrameWithCustomTileAndPalette(1, TRUE, 0x001, 0xF);
+        AddTextPrinterParameterized4(1, 2, 0, 3, 1, 1, sTextColor, 0, gUnknown_841B69E);
+        CopyWindowToVram(1, 2);
+        break;
+    case 5:
+        CreateYesNoMenu(&sWindowTemplates[0], 2, 0, 2, 0x001, 0xF, 1);
+        CopyBgTilemapBufferToVram(0);
+        break;
+    default:
+        BeginNormalPaletteFade(0xFFFF, 0, 16, 0, RGB_WHITEALPHA);
+        SetVBlankCallback(VBlankCB_WaitYesNo);
+        gTasks[taskId].func = Task_HandleYesNoMenu;
+        break;
+    }
+    sClearSaveDataState->unk1++;
+}
+
+static void Task_HandleYesNoMenu(u8 taskId)
+{
+    // agbcc refuses to keep &sClearSaveDataState in a register
+    // unless explicitly told to do so as such:
+    struct ClearSaveDataStruct ** r5 = &sClearSaveDataState;
+    if ((*r5)->unk0 == 0)
+    {
+        switch (Menu_ProcessInputNoWrapClearOnChoose())
+        {
+        case -1:
+        case 1:
+            PlaySE(SE_SELECT);
+            break;
+        case 0:
+            PlaySE(SE_SELECT);
+            FillWindowPixelBuffer(1, PIXEL_FILL(1));
+            AddTextPrinterParameterized4(1, 2, 0, 3, 1, 1, sTextColor, 0, gUnknown_841B6B9);
+            CopyWindowToVram(1, 3);
+            ClearSaveData();
+            break;
+        case -2:
+        default:
+            return;
+        }
+        (*r5)->unk0++;
+    }
+    else
+    {
+        Task_CleanUpAndSoftReset(taskId);
+    }
+}
+
+static void Task_CleanUpAndSoftReset(u8 taskId)
+{
+    switch (sClearSaveDataState->unk2)
+    {
+    case 0:
+        BeginNormalPaletteFade(0xFFFF, 0, 0, 16, RGB_WHITEALPHA);
+        sClearSaveDataState->unk2++;
+        break;
+    case 1:
+        if (!gPaletteFade.active)
+        {
+            DestroyYesNoMenu();
+            DestroyTask(taskId);
+            FreeAllWindowBuffers();
+            FREE_AND_SET_NULL(sClearSaveDataState);
+            DoSoftReset();
+            // noreturn
+        }
+        break;
+    }
+}
+
+static void CB2_Sub_SaveClearScreen_Init(void)
+{
+    ResetSpriteData();
+    ResetPaletteFade();
+    ResetTasks();
+}
+
+static void SaveClearScreen_GpuInit(void)
+{
+    DmaClearLarge16(3, (void *)VRAM, VRAM_SIZE, 0x1000);
+
+#ifndef NONMATCHING
+    asm("":::"ip");
+#endif
+
+    do
+    {
+        void * dest = (void *)OAM;
+        size_t size = OAM_SIZE;
+        DmaClear32(3, dest, size);
+    } while (0);
+
+    do
+    {
+        void * dest = (void *)PLTT;
+        size_t size = PLTT_SIZE;
+        DmaClear16(3, dest, size);
+    } while (0);
+
+    SetGpuReg(REG_OFFSET_DISPCNT, 0);
+    SetGpuReg(REG_OFFSET_BLDY, 0);
+    ResetBgsAndClearDma3BusyFlags(FALSE);
+    InitBgsFromTemplates(0, sBgTemplates, NELEMS(sBgTemplates));
+    ChangeBgX(0, 0, 0);
+    ChangeBgY(0, 0, 0);
+    ChangeBgX(1, 0, 0);
+    ChangeBgY(1, 0, 0);
+    ChangeBgX(2, 0, 0);
+    ChangeBgY(2, 0, 0);
+    ChangeBgX(3, 0, 0);
+    ChangeBgY(3, 0, 0);
+    InitWindows(sWindowTemplates);
+    DeactivateAllTextPrinters();
+    SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_MODE_0 | DISPCNT_OBJ_1D_MAP | DISPCNT_OBJ_ON);
+    ShowBg(0);
+}