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actordim.s
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actordim.s
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/*
* Dragon - Map actor dimensions
* Copyright (C) 2016 Sandor Zsuga (Jubatian)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "m74cfg.h"
#include <avr/io.h>
; (Needed only for register names for X, Y and Z)
.section .text
/*
** Fills in sprite physics structure's xbs and ybs members by actor type (bits
** 0 - 5). If bit 7 of type is set, alternate xbs & ybs are returned (can be
** used for the dragon & others).
**
** r24: typ
** r23:r22: spr
*/
.global actordim_get
actordim_get:
movw XL, r22
adiw XL, 4 ; Location of 'xbs' in structure
ldi ZH, hi8(RES_SPRIDSIZE_OFF)
mov ZL, r24
bst ZL, 7
bld ZL, 6
ori ZL, 0x80 ; Converted 'typ' input to load address
lpm r22, Z
mov r23, r22
andi r22, 0x0F ; X size
lsl r22
st X+, r22 ; xbs written
andi r23, 0xF0 ; Y size
lsr r23
lsr r23
st X+, r23 ; ybs written
ret