astro_ship_shield_data.asm

//////////////////////////////////////////////////////////////////////////////
// astro_ship_shield_data.asm 
// Copyright(c) 2021 Neal Smith.
// License: MIT. See LICENSE file in root directory.
//////////////////////////////////////////////////////////////////////////////
// contains the data that is needed by astro_ship_shield_code.asm
// This includes some variables that can be tested by the main engine
// to determine what to do based on shield state
// 
//////////////////////////////////////////////////////////////////////////////
#importonce

#import "astro_sprite_data.asm"

//////////////////////////////////////////////////////////////////////////////
// Constants

// number of frames the shield stays on
.const SHIP_SHIELD_FRAMES = 60
.const SHIP_SHIELD_ANIMATION_FRAMES = 5

// Constants end
//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////////
// internal variables
shield_sprite_data_ptr_table:
    .word sprite_shield_00
    .word sprite_shield_01
    .word sprite_shield_02
    .word sprite_shield_03
    .word sprite_shield_04

// internal variables end
//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////////
// exposed variables, for engine to get state of ship death

// Will be zero when ship is not shielded or 
// the number of frames remaining in the effect if it is active
ship_1_shield_count: .byte 0
ship_2_shield_count: .byte 0

// exposed variables end
//////////////////////////////////////////////////////////////////////////////