xhads/source/core.ads

-- Copyright (c) 2024 - Ognjen 'xolatile' Milan Robovic
--
-- GNU General Public Licence (version 3 or later)

with ada.text_io, ada.strings.unbounded, interfaces.c, ray;
use  ada.text_io, ada.strings.unbounded, interfaces.c, ray;

package core is

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	type echo_status is (
		failure,                warning,                success,                comment,                import,                 export
	);

	type cursor_code is (
		cursor_none,            cursor_left,            cursor_right,           cursor_middle
	);

	type signal_code is (
		signal_none,            signal_space,           signal_0,               signal_1,               signal_2,               signal_3,
		signal_4,               signal_5,               signal_6,               signal_7,               signal_8,               signal_9,
		signal_a,               signal_b,               signal_c,               signal_d,               signal_e,               signal_f,
		signal_g,               signal_h,               signal_i,               signal_j,               signal_k,               signal_l,
		signal_m,               signal_n,               signal_o,               signal_p,               signal_q,               signal_r,
		signal_s,               signal_t,               signal_u,               signal_v,               signal_w,               signal_x,
		signal_y,               signal_z,               signal_grave,           signal_escape,          signal_enter,           signal_tab,
		signal_backspace,       signal_right,           signal_left,            signal_down,            signal_up,              signal_kp_0,
		signal_kp_1,            signal_kp_2,            signal_kp_3,            signal_kp_4,            signal_kp_5,            signal_kp_6,
		signal_kp_7,            signal_kp_8,            signal_kp_9,            signal_kp_subtract,     signal_kp_add,          signal_left_shift,
		signal_left_control
	);

	type animation is (
		idle,                   walk,                   melee,                  shoot,                  wounded,                dead
	);

                                             ------------------------------------------------------------------------------------------

	type colour_range is range 0 .. 2 ** 8 - 1;

	for colour_range'size use 8;

	type colour is record r, g, b, a : colour_range; end record;

	subtype short_string is string (1 .. 24);
	subtype long_string  is string (1 .. 72);

	type pointer is access procedure;

	type vector is record x, y                                 : integer; end record;
	type sprite is record index, width, height, frames, states : integer; end record;
	type font   is record index, scale, space                  : integer; end record;
	type song   is record index                                : integer; end record;

	type point is record
		value, limit : natural;
	end record;

	type string_box_data is record
		data : access string           := null;
		text :        unbounded_string := null_unbounded_string;
		size :        vector           := (0, 0);
	end record;

                                             ------------------------------------------------------------------------------------------

	folder : constant string := ".";

	icon                : constant natural := 32;
	base                : constant natural := 16;
	gameplay_framerate  : constant natural := 60;
	animation_framerate : constant natural :=  4;

	echo_mark : constant array (echo_status) of boolean := (
		failure => true,
		warning => true,
		success => true,
		comment => true,
		import  => true,
		export  => true
	);

	engine_active : boolean := false;

	cursor         : vector      := (0, 0);
	camera         : vector      := (0, 0);
	cursor_mode    : cursor_code := cursor_none;
	signal_mode    : signal_code := signal_none;
	framerate      : integer     := 0;
	global_time    : natural     := 0;
	gameplay_time  : natural     := 0;
	animation_time : natural     := 0;

	wheel : float := 0.0;

	zoom : natural := 1;

	help_box : string_box_data;
	text_box : string_box_data;

	global_mapshot : ray.image;

                                             ------------------------------------------------------------------------------------------

	function "=" (a, b : in signal_code) return boolean;
	function "=" (a, b : in cursor_code) return boolean;
	function "/" (a, b : in signal_code) return boolean;
	function "/" (a, b : in cursor_code) return boolean;

	function "+" (data : in point; modifier : in natural) return point;
	function "-" (data : in point; modifier : in natural) return point;
	function "*" (data : in point; modifier : in natural) return point;
	function "/" (data : in point; modifier : in natural) return point;

	procedure echo      (                        status : in echo_status; text : in string);
	procedure echo_when (condition : in boolean; status : in echo_status; text : in string);

	procedure dash;
	procedure semi_dash;

	function c_string (ada_string : in string) return string;

	function random (minimum, maximum        : in integer) return integer;
	function clip   (value, minimum, maximum : in integer) return integer;

	function lowercase (text : in string) return string;

	function window_width  return integer;
	function window_height return integer;

	function center_x (object : in integer) return integer;
	function center_y (object : in integer) return integer;

	function cursor_inside (x, y, width, height : in integer) return boolean;

	function import_sprite (file_path : in string; frames, states : in integer) return sprite;
	function import_font   (file_path : in string; scale, space   : in integer) return font;
	function import_song   (file_path : in string)                              return song;

	procedure import_text (data : in out string_box_data; file_path : in string);

	procedure create_image (width, height : in integer);
	procedure render_image (data : in sprite; x, y, u, v, width, height : in integer);
	procedure export_image (file_path : in string);

	procedure draw (data   : in sprite    := (others => 0);
	                x      : in integer   := 0;
	                y      : in integer   := 0;
	                u      : in integer   := 0;
	                v      : in integer   := 0;
	                width  : in integer   := 0;
	                height : in integer   := 0;
	                state  : in animation := idle;
	                factor : in integer   := zoom;
	                tint   : in colour    := (others => 255));

	procedure draw_horizontally (data : in sprite; x, y, width, factor  : in integer; tint : in colour := (others => 255));
	procedure draw_vertically   (data : in sprite; x, y, height, factor : in integer; tint : in colour := (others => 255));

	procedure write (text : in string  := "";
	                 x    : in integer := 0;
	                 y    : in integer := 0;
	                 tint : in colour  := (others => 255);
	                 size : in integer := 0;
	                 data : in font    := (others => 0));

	procedure play (index : in integer);
	procedure stop (index : in integer);

	procedure overlay;

	function read_help_box return string;
	function read_text_box return string;

	procedure write_help_box (text : in string);
	procedure write_text_box (text : in string);

	procedure increment (value : in out integer);
	procedure decrement (value : in out integer);

	procedure idle_skip;
	procedure move_camera_up;
	procedure move_camera_down;
	procedure move_camera_left;
	procedure move_camera_right;

	procedure toggle_fullscreen;

	procedure initialize;
	procedure deinitialize;
	procedure synchronize;

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end core;