InvFrames.zh (NPC iFrames)

//////////////////////////////////
/// Enemy Invincibility Frames ///
//////////////////////////////////

//Settings for Enemy Invincibility Frames
const int ENEMY_INVINCIBILITY_FRAMES_DURATION = 180;
const int INVINCIBLE_ENEMIES_PHANTOM = 1; //Setting to enable or disable phantoming injured enemies.
const int STORE_ORIGINAL_ENEMY_PALETTE = 1; //Setting to enable storing original enemy palette or cset.

//You may enable *ONE* of these two rules, to match your quest rule settings.
//! If one is enabled, the other MUST be disabled.
const int ENEMIES_FLICKER_WHEN_HIT = 0; //Use the OriginalSprite, and store it instead of CSet or BPal
const int ENEMIES_FLASH_WHEN_HIT = 0; //Use the CSet or BPal to make an enemy flash, when hit.

//Values For Enemy Invincibility Frames

//n->Misc Indices
const int ENEM_HP_LAST = 1; //n->Mics[] holds last enemy HP. Adjusted when damaged.
const int ENEM_INV_FRAMES = 2; //n->Misc[] holds the present nth frame of invincibility as a countdown timer.
const int ENEM_ORIG_PAL = 3; //original CSet or Palette, or OriginalSprite

const int ENEM_BLANK_TILE = 65260; //Set to a tile at the head of a FULL PAGE of BLANK tiles.
//const int ENEM_FLASH_TIMER = 4;

//Framecount for each enemy flash or flicker.
const int ENEM_FLASH_1 = 180; //Will change on frame 180
const int ENEM_FLASH_2 = 150; //...frame 150
const int ENEM_FLASH_3 = 120;
const int ENEM_FLASH_4 = 90;
const int ENEM_FLASH_5 = 60;
const int ENEM_FLASH_6 = 30; //...frame 30

//Cset or BPal to use when flashing
const int ENEM_BPAL_FLASH = 6;
const int ENEM_CSET_FLASH = 6;


//Run before Waitdraw, and before EnemyInvincibilityFrames()
void InitEnemyLastHP(){
    for ( int q = 1; q <= Screen->NumNPCs(); q++ ) {
        npc n = Screen->LoadNPC(q);
        if (!n->Misc[ENEM_HP_LAST] && n->HP > 0) {
            n->Misc[ENEM_HP_LAST] = n->HP;
            if ( STORE_ORIGINAL_ENEMY_PALETTE && !n->Misc[ENEM_ORIG_PAL] ) {
                if ( n->CSet == 14 ) n->Misc[ENEM_ORIG_PAL] = n->BossPal;
                else n->Misc[ENEM_ORIG_PAL] = n->CSet;
            }
            if ( ENEMIES_FLICKER_WHEN_HIT && !n->Misc[ENEM_ORIG_PAL] ) {
                n->Misc[ENEM_ORIG_PAL] = n->OriginalTile;
            }
        }
    }
}

void _InitEnemyLastHP(){
    for ( int q = 1; q <= Screen->NumNPCs(); q++ ) {
        npc n = Screen->LoadNPC(q);
        if (!n->Misc[ENEM_HP_LAST] && n->HP > 0) n->Misc[ENEM_HP_LAST] = n->HP;
    }
}

//Run before Waitdraw and before any collision/damage functions that need to read these values.
void _EnemyInvincibilityFrames(){
    for ( int q = 1; q <= Screen->NumNPCs(); q++ ) {
        npc n = Screen->LoadNPC(q);
        if ( n->Misc[ENEM_HP_LAST] > n->HP ) {
            n->Misc[ENEM_HP_LAST] = n->HP;
            n->Misc[ENEM_INV_FRAMES] = ENEMY_INVINCIBILITY_FRAMES_DURATION;
        }
        if ( n->Misc[ENEM_INV_FRAMES] > 0 ) n->Misc[ENEM_INV_FRAMES]--;
        if ( n->Misc[ENEM_INV_FRAMES] < 0 ) n->Misc[ENEM_INV_FRAMES] = 0;
    }
}

//Run after InitEnemyLastHP, before Waitdraw and before any collision/damage functions that need to read these values.
void EnemyInvincibilityFrames(){
    for ( int q = 1; q <= Screen->NumNPCs(); q++ ) {
        npc n = Screen->LoadNPC(q);
        if ( n->Misc[ENEM_HP_LAST] > n->HP ) {
            n->Misc[ENEM_HP_LAST] = n->HP;
            n->Misc[ENEM_INV_FRAMES] = ENEMY_INVINCIBILITY_FRAMES_DURATION;
        }
        if ( n->Misc[ENEM_INV_FRAMES] > 0 ) n->Misc[ENEM_INV_FRAMES]--;
        if ( n->Misc[ENEM_INV_FRAMES] < 0 ) n->Misc[ENEM_INV_FRAMES] = 0;

        if ( INVINCIBLE_ENEMIES_PHANTOM ) {
            if ( EnemyInvincible(n) && n->DrawStyle != DS_PHANTOM ) n->DrawStyle = DS_PHANTOM;
            if ( !EnemyInvincible(n) && n->DrawStyle == DS_PHANTOM
                && !GetNPCMiscFlag(n,NPCM_TRANSLUCENT) && !GetNPCMiscFlag(n,NPCM_FLICKERING)
                && !GetNPCMiscFlag(n,NPCM_FLASHING) ) n->DrawStyle = DS_NORMAL;

        }
    }
}



//Run IMMEDIATELY AFTER EnemyInvincibilityFrames() if you have flashing, or flickering settings enabled.
void FlashEnemyWhenHit(npc n) {
    if ( ENEMIES_FLASH_WHEN_HIT && n->Misc[ENEM_INV_FRAMES] > 0 ) {
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_1 ) {
            if ( n->CSet == 14 ) n->BossPal = ENEM_BPAL_FLASH;
            else n->CSet = ENEM_CSET_FLASH;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_2 ) {
            if ( n->CSet == 14 ) n->BossPal = n->Misc[ENEM_ORIG_PAL];
            else n->CSet = n->Misc[ENEM_ORIG_PAL];
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_3 ) {
            if ( n->CSet == 14 ) n->BossPal = ENEM_BPAL_FLASH;
            else n->CSet = ENEM_CSET_FLASH;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_4 ) {
            if ( n->CSet == 14 ) n->BossPal = n->Misc[ENEM_ORIG_PAL];
            else n->CSet = n->Misc[ENEM_ORIG_PAL];
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_5 ) {
            if ( n->CSet == 14 ) n->BossPal = ENEM_BPAL_FLASH;
            else n->CSet = ENEM_CSET_FLASH;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_6 ) {
            if ( n->CSet == 14 ) n->BossPal = n->Misc[ENEM_ORIG_PAL];
            else n->CSet = n->Misc[ENEM_ORIG_PAL];
        }
    }
    if ( ENEMIES_FLICKER_WHEN_HIT && n->Misc[ENEM_INV_FRAMES] > 0 ) {
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_1 ) {
            n->OriginalTile = ENEM_BLANK_TILE;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_2 ) {
            n->OriginalTIle = n->Misc[ENEM_ORIG_PAL];
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_3 ) {
            n->OriginalTile = ENEM_BLANK_TILE;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_4 ) {
            n->OriginalTIle = n->Misc[ENEM_ORIG_PAL];
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_5 ) {
            n->OriginalTile = ENEM_BLANK_TILE;
        }
        if ( n->Misc[ENEM_INV_FRAMES] == ENEM_FLASH_6 ) {
            n->OriginalTIle = n->Misc[ENEM_ORIG_PAL];
        }
    }
}

//Returns if an enemy is invincible.
int EnemyInvincible(npc n){
    return n->Misc[ENEM_INV_FRAMES];
}

//Immediately sets, or resets enemy invincibility to on.
void SetEnemyInvincible(npc n) {
    n->Misc[ENEM_INV_FRAMES] = ENEMY_INVINCIBILITY_FRAMES_DURATION;
}

//Immediately disables mock enemy invincibility.
void SetEnemyNotInvincible(npc n) {
    n->Misc[ENEM_INV_FRAMES] = 0;
}