src/common/sprite.h

   1 ;
   2 ;    Copyright (C) 2004, 2005 Kent Hansen.
   3 ;
   4 ;    This file is part of Neotoxin.
   5 ;
   6 ;    Neotoxin is free software; you can redistribute it and/or modify
   7 ;    it under the terms of the GNU General Public License as published by
   8 ;    the Free Software Foundation; either version 2 of the License, or
   9 ;    (at your option) any later version.
  10 ;
  11 ;    Neotoxin is distributed in the hope that it will be useful,
  12 ;    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;    GNU General Public License for more details.
  15 ;
  16 ;    You should have received a copy of the GNU General Public License
  17 ;    along with this program; if not, write to the Free Software
  18 ;    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 ;
  20
  21 .ifndef SPRITE_H
  22 .define SPRITE_H
  23
  24 ; Hardware regs.
  25 SPRITE_ADDR_REG     .equ     $2003
  26 SPRITE_IO_REG       .equ     $2004
  27 SPRITE_DMA_REG      .equ     $4014
  28
  29 ; Record that describes a sprite's attributes.
  30 .record sprite_attribs v_flip:1, h_flip:1, pri:1, pad0:3, pal:2
  31
  32 SPRITE_ATTR_V_FLIP  .equ mask sprite_attribs::v_flip
  33 SPRITE_ATTR_H_FLIP  .equ mask sprite_attribs::h_flip
  34 SPRITE_ATTR_PRI     .equ mask sprite_attribs::pri
  35 SPRITE_ATTR_PAL     .equ mask sprite_attribs::pal
  36
  37 ; Structure that describes a sprite.
  38 ; The field order is such that it can be DMA'ed directly to sprite RAM.
  39 .struc sprite_state
  40 _y      .byte
  41 tile    .byte
  42 attr    .sprite_attribs
  43 _x      .byte
  44 .ends
  45
  46 SPRITE_INDEX_INCR .equ 15*4
  47 SPRITE_BASE_INCR  .equ 17*4
  48
  49 ; Exported symbols.
  50 .extrn reset_sprites:proc
  51 .extrn next_sprite_index:proc
  52
  53 .extrn sprites:sprite_state
  54 .extrn sprite_index:byte
  55
  56 .endif  ; !SPRITE_H