path: root/src/interrupts.c

#include "functions.h"
#include "gba/m4a.h"
#include "global.h"
#include "main.h"
#include "message.h"
#include "object.h"
#include "player.h"
#include "save.h"
#include "screen.h"
#include "sound.h"
#include "structures.h"
#include "ui.h"

extern u8 gUnk_03003DE0;
extern u8 gUnk_03000C30;

extern u8 gUpdateVisibleTiles;
extern Entity* gPlayerClones[3];
extern u16 gUnk_080B2CD8[];

void ram_IntrMain(void);
static void sub_080171F0(void);
static void HandlePlayerLife(Entity* this);

extern VBlankDMA gVBlankDMA;

void sub_08016CA8(BgSettings* bg);
void PerformVBlankDMA(void);
void DispCtrlSet(void);

void DummyIntr(void) {
    /* .. */
}

void EnableVBlankIntr(void) {
    INTR_VECTOR = ram_IntrMain;
    REG_DISPSTAT = DISPSTAT_VCOUNT_INTR | DISPSTAT_VBLANK_INTR | (80 << 8);
    REG_IE = INTR_FLAG_VBLANK | INTR_FLAG_VCOUNT | INTR_FLAG_GAMEPAK;
    REG_IME = 1;
}

void VBlankIntr(void) {
    DmaStop(0);
    m4aSoundVSync();
    if (gMain.interruptFlag == 0) {
        DispCtrlSet();
        DmaCopy32(0, &gScreen.vBlankDMA, &gVBlankDMA, sizeof(VBlankDMA));
        gMain.interruptFlag = 1;
    }
    PerformVBlankDMA();
    INTR_CHECK |= 1;
}

void HBlankIntr(void) {
    REG_DISPSTAT = DISPSTAT_VCOUNT_INTR | DISPSTAT_VBLANK_INTR | (80 << 8);
    m4aSoundMain();
}

void PerformVBlankDMA(void) {
    if (gVBlankDMA.ready) {
        const u16* src = gVBlankDMA.src;
        u16* dest = gVBlankDMA.dest;
        s32 size, i = size = gVBlankDMA.size;
        DmaSet(0, src, dest, size);

        // TODO Why is it copied again?
        i = size & 0x3fff;
        if (i == 0) {
            i = 0x4000;
        }
        do {
            *dest++ = *src++;
        } while (--i > 0);
    }
}

void UpdateDisplayControls(void) {
    if (gOAMControls.field_0x0 && (gScreen.lcd.displayControl & DISPCNT_OBJ_ON)) {
        gOAMControls.field_0x0 = 0;
        DmaCopy32(3, &gOAMControls.oam, OAM, OAM_SIZE);
    }
    sub_08016CA8(&gScreen.bg0);
    sub_08016CA8(&gScreen.bg1);
    sub_08016CA8((BgSettings*)&gScreen.bg2);
    sub_08016CA8((BgSettings*)&gScreen.bg3);
}

void sub_08016CA8(BgSettings* bg) {
    if (bg->updated && bg->tilemap != NULL) {
        u32 dest;
        bg->updated = 0;
        dest = bg->control;
        DmaCopy32(3, bg->tilemap, ((dest << 3) & 0xF800) + VRAM, gUnk_080B2CD8[dest >> 14]);
    }
}

void DispCtrlSet(void) {
    u16* tmp2;
    BgControls* controls;
    BgTransformationSettings* bgTfSettings;
    u16 tmp = gScreen.lcd.displayControl & gScreen.lcd.displayControlMask;
    REG_DISPCNT = tmp;

    REG_BG0CNT = gScreen.bg0.control;
    REG_BG1CNT = gScreen.bg1.control;
    REG_BG2CNT = gScreen.bg2.control;
    REG_BG3CNT = gScreen.bg3.control;
    REG_BG0HOFS = gScreen.bg0.xOffset;
    REG_BG0VOFS = gScreen.bg0.yOffset;
    REG_BG1HOFS = gScreen.bg1.xOffset;
    REG_BG1VOFS = gScreen.bg1.yOffset;
    REG_BG2HOFS = gScreen.bg2.xOffset;
    REG_BG2VOFS = gScreen.bg2.yOffset;
    REG_BG3HOFS = gScreen.bg3.xOffset;
    REG_BG3VOFS = gScreen.bg3.yOffset;

    controls = &(gScreen.controls);
    bgTfSettings = &controls->bg2;

    REG_BG2PA = bgTfSettings->dx;
    REG_BG2PB = bgTfSettings->dmx;
    REG_BG2PC = bgTfSettings->dy;
    REG_BG2PD = bgTfSettings->dmy;
    REG_BG2X_L = bgTfSettings->xPointLeastSig;
    REG_BG2X_H = bgTfSettings->xPointMostSig;
    REG_BG2Y_L = bgTfSettings->yPointLeastSig;
    REG_BG2Y_H = bgTfSettings->yPointMostSig;

    bgTfSettings = &controls->bg3;

    REG_BG3PA = bgTfSettings->dx;
    REG_BG3PB = bgTfSettings->dmx;
    REG_BG3PC = bgTfSettings->dy;
    REG_BG3PD = bgTfSettings->dmy;
    REG_BG3X_L = bgTfSettings->xPointLeastSig;
    REG_BG3X_H = bgTfSettings->xPointMostSig;
    REG_BG3Y_L = bgTfSettings->yPointLeastSig;
    REG_BG3Y_H = bgTfSettings->yPointMostSig;

    tmp2 = &controls->window0HorizontalDimensions;
    REG_WIN0H = tmp2[0];
    // REG_WIN0H = *tmp2;
    REG_WIN1H = tmp2[1];
    REG_WIN0V = tmp2[2];
    REG_WIN1V = tmp2[3];
    REG_WININ = tmp2[4];
    REG_WINOUT = tmp2[5];
    REG_MOSAIC = tmp2[6];
    REG_BLDCNT = tmp2[7];
    REG_BLDALPHA = tmp2[8];
    REG_BLDY = tmp2[9];
}

// Load any resources that were requested with LoadResourceAsync
void LoadResources(void) {
    if (gUnk_03003DE0 != 0) {
        u8* buf = &gUnk_03000C30;
        s32 i = gUnk_03003DE0;
        gUnk_03003DE0 = 0;
        do {
            switch (*buf) {
                case 0:
                    DmaCopy32(3, *(u32*)(buf + 4), *(u32*)(buf + 8), *(u16*)(buf + 2));
                    break;
                case 1:
                    LZ77UnCompVram(*(void**)(buf + 4), *(u8**)(buf + 8));
                    break;
                case 2:
                    DmaFill32(3, *(u32*)(buf + 4), *(u32*)(buf + 8), *(u16*)(buf + 2));
                    break;
            }
            buf += 12;
            i--;
        } while (0 < i);
    }
}

void WaitForNextFrame(void) {
    gMain.interruptFlag = 0;
    VBlankIntrWait();
    do {
        // Our VBlankIntr will set this flag
    } while (gMain.interruptFlag == 0);

    sub_080ADD70();
    sub_0801C25C();
    UpdateDisplayControls();
    LoadResources();

    if (gUpdateVisibleTiles) {
        gUpdateVisibleTiles = 0;
        if (gMapBottom.bgSettings != NULL)
            // sizeof(BGBuffer) = 0x800, what are we omitting?
            DmaCopy32(3, &gBG1Buffer, VRAM + (gMapBottom.bgSettings->control & 0x1f00) * 8, 0x5C0);
        if (gMapTop.bgSettings != NULL)
            DmaCopy32(3, &gBG2Buffer, VRAM + (gMapTop.bgSettings->control & 0x1f00) * 8, 0x5C0);
    }
    FadeVBlank();
}

void PlayerUpdate(PlayerEntity* this) {
    if (gSave.stats.effect != 0)
        gPlayerState.flags |= PL_DRUGGED;
    else
        gPlayerState.flags &= ~PL_DRUGGED;

    if (!EntityDisabled(super)) {
        if (gPlayerState.flags & PL_MOLDWORM_CAPTURED) {
            PutAwayItems();
            if (gPlayerState.flags & PL_MOLDWORM_RELEASED) {
                gPlayerState.queued_action = PLAYER_ROLL;
                gPlayerState.flags &= ~PL_MOLDWORM_CAPTURED;
                gPlayerState.hurtBlinkSpeed = 240;
                COLLISION_ON(super);
            } else {
                COLLISION_OFF(super);
                gPlayerState.framestate = PL_STATE_F;
            }
        }
        HandlePlayerLife(super);
        DoPlayerAction(this);
        if ((super->z.WORD == 0) && (super->action == PLAYER_NORMAL || super->action == PLAYER_MINISH))
            DoTileInteractionHere(super, 8);
        sub_080171F0();
    }
    sub_08078FB0(super);
    DrawEntity(super);
    UpdatePlayerPalette();
}

// Responsible for some life things like low health beep and initiating the death sequence
static void HandlePlayerLife(Entity* this) {
    u32 threshold;

    gUnk_0200AF00.rActionPlayerState = R_ACTION_NONE;
    gUnk_0200AF00.rActionInteractTile = R_ACTION_NONE;
    gUnk_0200AF00.rActionGrabbing = R_ACTION_NONE;

    if ((gPlayerEntity.base.contactFlags & CONTACT_TAKE_DAMAGE) && (gPlayerEntity.base.iframes > 0))
        SoundReq(SFX_86);

    gPlayerState.flags &= ~(PL_FALLING | PL_CONVEYOR_PUSHED);
    if (gPlayerState.flags & PL_BURNING)
        ResetActiveItems();
    if ((gPlayerState.flags & PL_CLONING) && gPlayerState.chargeState.action == 0)
        DeleteClones();
    if (sub_08079B24() == 0)
        sub_08079708(this);

    gPossibleInteraction.isUpdated = 0;
    if (gPlayerState.field_0x27[0] != 0)
        gPlayerState.field_0x27[0]--;

    gPlayerState.framestate_last = gPlayerState.framestate;
    gPlayerState.framestate = PL_STATE_IDLE;
    if (gPlayerState.field_0x8a != 0) {
        gPlayerState.field_0x8a--;
        return;
    }

    if ((gPlayerState.controlMode != CONTROL_ENABLED) || (gMessage.state & 0x7f))
        return;

#ifdef EU
    if ((gUnk_0200AF00.unk_1 == 0) && gRoomTransition.frameCount % 90 == 0) {
        threshold = gSave.stats.maxHealth / 4;
        if (threshold > 24)
            threshold = 24;
        if (threshold < 8)
            threshold = 8;

        if (gSave.stats.health <= threshold) {
            EnqueueSFX(SFX_LOW_HEALTH);
        }
    }
#else
    // TODO: why does message state affect health drops in US/JP?
    gRoomVars.needHealthDrop = gMessage.state & MESSAGE_ACTIVE;
    threshold = gSave.stats.maxHealth / 4;
    if (threshold > 24)
        threshold = 24;
    if (threshold < 8)
        threshold = 8;

    if (gSave.stats.health <= threshold) {
        gRoomVars.needHealthDrop = TRUE;
        if ((gUnk_0200AF00.unk_1 == 0) && gRoomTransition.frameCount % 90 == 0) {
            EnqueueSFX(SFX_LOW_HEALTH);
        }
    }
#endif

    if (gSave.stats.charm == 0) {
        gSave.stats.charmTimer = 0;
    } else if ((gSave.stats.charmTimer == 0) || --gSave.stats.charmTimer == 0) {
        gSave.stats.charm = 0;
        SoundReq(SFX_ICE_BLOCK_MELT);
    }

    if (gSave.stats.picolyteType == 0) {
        gSave.stats.picolyteTimer = 0;
    } else if ((gSave.stats.picolyteTimer == 0) || (--gSave.stats.picolyteTimer == 0)) {
        gSave.stats.picolyteType = 0;
        SoundReq(SFX_140);
    } else if ((gSave.stats.picolyteTimer & 0xf) == 0) {
        CreateSparkle(this);
    }

    if (gSave.stats.effect == 0) {
        gSave.stats.effectTimer = 0;
    } else if ((gSave.stats.effectTimer == 0) || --gSave.stats.effectTimer == 0) {
        gSave.stats.effect = 0;
    } else if ((gSave.stats.effectTimer & 0x3f) == 0) {
        CreateFx(this, (FX_RED_AURA - 1) + gSave.stats.effect, 0);
    }
}

static void sub_080171F0(void) {
    if (gPlayerState.mobility != 0)
        ResetActiveItems();
    if (gPlayerState.field_0x14 != 0)
        gPlayerState.field_0x14--;
    if (gPlayerEntity.unk_7a != 0)
        gPlayerEntity.unk_7a--;

    gPlayerEntity.base.contactFlags &= ~CONTACT_TAKE_DAMAGE;
    if (gPlayerEntity.base.action != PLAYER_DROWN)
        COPY_FLAG_FROM_TO(gPlayerState.flags, 0x2, 0x10000);

    gPlayerState.flags &= ~PL_FLAGS2;
    sub_080028E0(&gPlayerEntity.base);

    if (gPlayerState.flags & PL_CLONING)
        gUnk_0200AF00.rActionPlayerState = R_ACTION_CANCEL;

    DetermineRButtonInteraction();
    gPlayerState.field_0x7 &= ~0x80;
    gPlayerState.field_0xa &= 0xf;
    gPlayerState.keepFacing &= ~0x80;
    gPlayerState.mobility = 0;
    gPlayerState.speed_modifier = 0;
    gPlayerState.attachedBeetleCount = 0;
    MemClear(&gCarriedEntity, sizeof(gCarriedEntity));
    gPlayerEntity.base.spriteOffsetY = gPlayerState.spriteOffsetY;
    gPlayerState.spriteOffsetY = 0;
    sub_0807B0C8();

    if (gPlayerState.flags & PL_CLONING)
        gPlayerClones[0]->spriteOffsetY = gPlayerClones[1]->spriteOffsetY = gPlayerClones[2]->spriteOffsetY = 0;

    if (gPlayerEntity.base.action == PLAYER_CLIMB)
        gPlayerState.flags |= PL_CLIMBING;
    else
        gPlayerState.flags &= ~PL_CLIMBING;

    sub_0807A8D8(&gPlayerEntity.base);
    if (gPlayerState.jump_status & 0xc0)
        gPlayerEntity.base.iframes = 0xfe;

    if (gPlayerEntity.base.action != PLAYER_ROOMTRANSITION) {
        sub_08077FEC(gPlayerEntity.base.action);
    }
}