;
;    Raw Game Engine
;    Copyright (C) 2023  Ernest Deak
;
;    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 <https://www.gnu.org/licenses/>.
;

%ifndef RGE_INC
%define RGE_INC

section .bss

; Raw Game Engine specific structures and memory defines

; These ought to be configured before the first include of rge.inc
; so that we can customize it at assembly time

%define __MEM_CHUNK_UNDEFINED_ERRMSG__ WARNING Memory chunk size has not been calculated. \
Please use the calc_mem_chunk macro to set it up correctly

%define __MEM_SLOT_NUM_UNDEFINED_ERRMSG__ WARNING The number of slots \
to use for memory has not been set up. Please use the set_slot_num macro \
to define it

%ifndef RGE_MAX_LAYERS
	%define RGE_MAX_LAYERS 3
%endif

%ifndef RG_OBJECT_LIST_SIZE
	%warning __MEM_SLOT_NUM_UNDEFINED_ERRMSG__
	%define RG_OBJECT_LIST_SIZE 128
%endif
%ifndef RG_OBJECT_SIZE
	%warning __MEM_CHUNK_UNDEFINED_ERRMSG__
	%define RG_OBJECT_SIZE 128
%endif

%ifndef RG_ANIM_SPRITE_OFFSET
	%error RG_ANIM_SPRITE_OFFSET has not been set!
%endif

; Memory locations

;; Bitmask for the objects that are allocated and need
;; to be updated per frame.
;; Each bit represents an index of the RG_Objects structures
RG_OList_Bitmask:
	resq ((RG_OBJECT_LIST_SIZE*RGE_MAX_LAYERS)/64)
	.end:

%define RG_BITMASK_LAYER_SIZE 64

global RG_OList_Bitmask

;; Actual place for objects with their data for the update
;; function.
RG_Objects:
	resb (RG_OBJECT_LIST_SIZE*RG_OBJECT_SIZE*RGE_MAX_LAYERS)
	.end:

global RG_Objects

%define RG_STRIDE (RG_OBJECT_SIZE * RGE_MAX_LAYERS)

section .data
;; TODO: disable bss preallocation in case of library?
;; In case of library usage, the address stored here is used instead
;; to allow for mmap and other runtime allocation schemes
;; NOTE: This is only a preparation for the feature
RG_Addr_Objects: dq 0

section .bss

endif

%endif

.