2018 ra sesion02 amstrad cpctelera example

;;-----------------------------LICENSE NOTICE------------------------------------
;;  This file is part of CPCtelera: An Amstrad CPC Game Engine
;;  Copyright (C) 2018 ronaldo / Fremos / Cheesetea / ByteRealms (@FranGallegoBR)
;;
;;  This program is free software: you can redistribute it and/or modify
;;  it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
;;
;;  You should have received a copy of the GNU Lesser General Public License
;;  along with this program.  If not, see <http://www.gnu.org/licenses/>.
;;-------------------------------------------------------------------------------

;; Include all CPCtelera constant definitions, macros and variables
.include "cpctelera.h.s"

;;
;; Start of _DATA area
;;  SDCC requires at least _DATA and _CODE areas to be declared, but you may use
;;  any one of them for any purpose. Usually, compiler puts _DATA area contents
;;  right after _CODE area contents.
;;
.area _DATA
.area _CODE

hero_data:
   .db   0x14, 0x21     ;; X, Y
   .db   0x02, 0x08     ;; W, H
   .db   0x0F           ;; Color

enemy_data:
   .db   0x20, 0x01     ;; X, Y
   .db   0x02, 0x08     ;; W, H
   .db   0xFF           ;; Color

;;
;; Declare all function entry points as global symbols for the compiler.
;; (The linker will know what to do with them)
;; WARNING: Every global symbol declared will be linked, so DO NOT declare
;; symbols for functions you do not use.
;;
.globl cpct_disableFirmware_asm
.globl cpct_drawSolidBox_asm
.globl cpct_getScreenPtr_asm

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; DIBUJAR UNA ENTIDAD
;; REGISTROS DESTRUIDOS: AF, BC, DE, HL
;; ENTRADA: IX -> Puntero a entidad
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ent_draw:
   ld    de, #0xC000       ;;Comienzo memoria de video
   ld     c, 1(ix)         ;; C = Entity Y
   ld     b, 0(ix)         ;; B = Entity X
   call cpct_getScreenPtr_asm

   ex    de, hl   ;; DE = Puntero a memoria
   ld  a, 4(ix)   ;; Color
   ld  b, 3(ix)   ;; alto
   ld  c, 2(ix)   ;; Ancho

   call cpct_drawSolidBox_asm

   ret

;;
;; MAIN function. This is the entry point of the application.
;;    _main:: global symbol is required for correctly compiling and linking
;;
_main::
   ;; Disable firmware to prevent it from interfering with string drawing
   call cpct_disableFirmware_asm

   ld    ix, #hero_data
   call ent_draw

   ld    ix, #enemy_data
   call ent_draw

   ;; Loop forever
loop:
   jr    loop