xhads/source/core.adb

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

with ray;

package body core is

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	type terminal_colour is (
		grey,                   red,                    green,                  yellow,                 blue,                   pink,
		cyan,                   white
	);

	type terminal_effect is (
		normal,                 bold,                   italic,                 underline,              blink,                  invert
	);

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	type texture_data_array is array (natural range <>) of ray.texture;
	type sound_data_array   is array (natural range <>) of ray.sound;
	type font_data_array    is array (natural range <>) of ray.font;

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

	texture_count : integer := 0;
	sound_count   : integer := 0;
	font_count    : integer := 0;

	texture_array : access texture_data_array;
	sound_array   : access sound_data_array;
	font_array    : access font_data_array;

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

	procedure terminal (colour : in terminal_colour := white;
	                    effect : in terminal_effect := normal) is
		format : string := character'val (27) & "[" & character'val (terminal_effect'pos (effect) + 48) & ";3" & character'val (terminal_colour'pos (colour) + 48) & "m";
	begin
		put (format);
	end terminal;

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

	procedure echo (status : in echo_status;
	                text   : in string) is
	begin
		if not echo_mark (status) then
			return;
		end if;
		--
		put ("[");
		case status is
			when failure => terminal (red,    bold); put ("Failure"); terminal;
			when warning => terminal (yellow, bold); put ("Warning"); terminal;
			when success => terminal (green,  bold); put ("Success"); terminal;
			when comment => terminal (grey,   bold); put ("Comment"); terminal;
			when import  => terminal (cyan,   bold); put ("  <--  "); terminal;
			when export  => terminal (blue,   bold); put ("  -->  "); terminal;
		end case;
		put ("] ");
		--
		put_line (text);
	end echo;

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	procedure dash is
	begin
		terminal (grey, bold);
		put ("------------------------------------------------------------------------------------------");
		put ("------------------------------------------------------------------------------------------");
		terminal;
		new_line;
	end dash;

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

	procedure semi_dash is
	begin
		terminal (grey, bold);
		put ("                                             ");
		put ("------------------------------------------------------------------------------------------");
		terminal;
		new_line;
	end semi_dash;

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	function c_string (ada_string : string) return string is
	begin
		return (ada_string & character'val (0));
	end c_string;

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	function random (minimum, maximum : in integer) return integer is
	begin
		return ray.get_random (minimum, maximum);
	end random;

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	function clip (value, minimum, maximum : in integer) return integer is
	begin
		if value < minimum then return minimum; end if;
		if value > maximum then return maximum; end if;
		--
		return value;
	end clip;

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	function lowercase (text : in string) return string is
		result : string (1 .. text'length);
	begin
		for index in text'range loop
			if text (index) in 'A' .. 'Z' then
				result (index) := character'val (character'pos (text (index)) + 32);
			else
				result (index) := text (index);
			end if;
		end loop;
		--
		return result;
	end lowercase;

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	function window_width  return integer is begin return ray.get_screen_width;  end window_width;
	function window_height return integer is begin return ray.get_screen_height; end window_height;

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	function import_sprite (file_path : in string; frames, states : in integer) return sprite is
		this : sprite;
	begin
		texture_array (texture_count) := ray.load_texture (c_string (file_path));
		--
		texture_count := texture_count + 1;
		this.index    := texture_count - 1;
		this.width    := texture_array (this.index).width / frames;
		this.height   := texture_array (this.index).height / states;
		this.frames   := frames;
		this.states   := states;
		--
		if this.width = 0 or this.height = 0 then
			echo (failure, "Sprite not imported: " & file_path);
		end if;
		--
		return this;
	end import_sprite;

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	function import_font (file_path : in string; scale, space : in integer) return font is
		this : font;
	begin
		font_array (font_count) := ray.load_font (c_string (file_path));
		--
		font_count := font_count + 1;
		this.index := font_count - 1;
		this.scale := scale;
		this.space := space;
		--
		return this;
	end import_font;

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

	function import_song (file_path : in string) return song is
		this : song;
	begin
		sound_array (sound_count) := ray.load_sound (c_string (file_path));
		--
		sound_count := sound_count + 1;
		this.index  := sound_count - 1;
		--
		return this;
	end import_song;

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

	procedure draw (data   : in sprite;
	                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 integer    := 0;
	                factor : in integer    := zoom;
	                tint   : in ray.colour := (others => 255)) is
		new_width  : constant float := float ((if width  = 0 then data.width  else width));
		new_height : constant float := float ((if height = 0 then data.height else height));
	begin
		ray.draw_texture (data => texture_array (data.index),
		                  uv   => (float (if u = 0 then (animation_time mod data.frames) * data.width else u), float (v), new_width, new_height),
		                  view => (float (x), float (y), new_width * float (factor), new_height * float (factor)),
		                  tint => tint);
	end draw;

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

	procedure write (text : in string  := "";
	                 x    : in integer := 0;
	                 y    : in integer := 0;
	                 data : in font) is
	begin
		ray.draw_text (data  => font_array (data.index),
		               text  => c_string (text),
		               view  => (float ((icon - data.scale) / 2 + x), float ((icon - data.scale) / 2 + y)),
		               scale => float (data.scale),
		               space => float (data.space));
	end write;

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	procedure play (index : in integer) is begin ray.play_sound (sound_array (index)); end play;
	procedure stop (index : in integer) is begin ray.stop_sound (sound_array (index)); end stop;

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	procedure overlay is
	begin
		ray.draw_rectangle (0, 0, window_width, window_height, (0, 0, 0, 127));
	end overlay;

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	procedure block_queue (data : in block) is
	begin
		if block_count = block_limit - 1 then
			return;
		end if;
		--
		block_array (block_count) := data;
		--
		increment (block_count);
	end block_queue;

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	function read_text_box return string is
	begin
		return to_string (text_box.data);
	end read_text_box;

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

	procedure write_text_box (text : in string) is
	begin
		text_box.data := to_unbounded_string (text);
	end write_text_box;

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

	procedure increment (value : in out integer) is begin value := value + 1; end increment;
	procedure decrement (value : in out integer) is begin value := value - 1; end decrement;

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

	procedure idle is begin null; end idle;

	procedure move_camera_up      is begin core.camera.y := core.camera.y - 1; end move_camera_up;
	procedure move_camera_down    is begin core.camera.y := core.camera.y + 1; end move_camera_down;
	procedure move_camera_left    is begin core.camera.x := core.camera.x - 1; end move_camera_left;
	procedure move_camera_right   is begin core.camera.x := core.camera.x + 1; end move_camera_right;

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	procedure initialize is
	begin
		echo (comment, "Initializing core components...");
		--
		engine_active := true;
		texture_array := new texture_data_array (0 .. 1600);
		sound_array   := new sound_data_array   (0 ..    4);
		font_array    := new font_data_array    (0 ..    8);
		--
		echo (comment, "-- Setting trace log level to none (ignoring all default Raylib logs).");
		ray.set_trace_log_level (ray.log_none);
		--
		ray.set_window_flags (ray.flag_window_resizable);
		--
		echo (comment, "-- Initializing Raylib window data...");
		echo (comment, "-- -- Window title  : Chads of Might & Magic");
		echo (comment, "-- -- Window width  : 1800");
		echo (comment, "-- -- Window height : 900");
		ray.open_window (1800, 900, "Chads of Might & Magic");
		--
		echo (comment, "-- Initializing Raylib audio device data...");
		ray.open_audio_device;
		--
		ray.randomization  (19970725);
		ray.set_target_fps (60);
		--
		echo (success, "Initialized core components.");
	end initialize;

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

	procedure deinitialize is
	begin
		echo (comment, "Deinitializing core components...");
		--
		engine_active := false;
		--
		echo (comment, "-- -- Unloading Raylib" & texture_count'image & " textures.");
		echo (comment, "-- -- Unloading Raylib" & sound_count'image   & " sounds.");
		echo (comment, "-- -- Unloading Raylib" & font_count'image    & " fonts.");
		--
		for index in 0 .. texture_count - 1 loop ray.unload_texture (texture_array (index)); end loop;
		for index in 0 .. sound_count   - 1 loop ray.unload_sound   (sound_array   (index)); end loop;
		for index in 0 .. font_count    - 1 loop ray.unload_font    (font_array    (index)); end loop;
		--
		echo (comment, "-- Deinitializing Raylib audio device data...");
		ray.close_audio_device;
		--
		echo (comment, "-- Deinitializing Raylib window data...");
		ray.close_window;
		--
		echo (success, "Deinitialized core components.");
	end deinitialize;

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

	procedure synchronize is
		signal : integer := signal_code'pos (signal_none);
	begin
		global_time    := global_time + 1;
		global_time    := global_time mod (gameplay_framerate * animation_framerate);
		gameplay_time  := global_time mod (gameplay_framerate);
		animation_time := global_time /   (gameplay_framerate / animation_framerate);
		framerate      := integer (ray.get_fps);
		signal         := ray.get_key_pressed;
		cursor.x       := ray.get_mouse_x;
		cursor.y       := ray.get_mouse_y;
		--
		ray.end_drawing;
		--
		if ray.exit_key_is_pressed then
			engine_active := false;
		end if;
		--
		if ray.mouse_button_is_pressed  (ray.mouse_button_left)   then cursor_mode := 1; end if;
		if ray.mouse_button_is_pressed  (ray.mouse_button_right)  then cursor_mode := 2; end if;
		if ray.mouse_button_is_pressed  (ray.mouse_button_middle) then cursor_mode := 3; end if;
		if ray.mouse_button_is_released (ray.mouse_button_left)   then cursor_mode := 0; end if;
		if ray.mouse_button_is_released (ray.mouse_button_right)  then cursor_mode := 0; end if;
		if ray.mouse_button_is_released (ray.mouse_button_middle) then cursor_mode := 0; end if;
		--
		case signal is
			when  48 ..  57 => signal_mode := signal_code'val (signal -  48 + signal_code'pos (signal_0));
			when  65 ..  90 => signal_mode := signal_code'val (signal -  65 + signal_code'pos (signal_a));
			when 320 .. 329 => signal_mode := signal_code'val (signal - 320 + signal_code'pos (signal_kp_0));
			--
			when   0    => signal_mode := signal_none;
			when  32    => signal_mode := signal_space;
			when  96    => signal_mode := signal_grave;
			when 340    => signal_mode := signal_left_shift;
			when 341    => signal_mode := signal_left_control;
			when 333    => signal_mode := signal_kp_subtract;
			when 334    => signal_mode := signal_kp_add;
			when 256    => signal_mode := signal_escape;
			when 257    => signal_mode := signal_enter;
			when 258    => signal_mode := signal_tab;
			when 259    => signal_mode := signal_backspace;
			when 262    => signal_mode := signal_right;
			when 263    => signal_mode := signal_left;
			when 264    => signal_mode := signal_down;
			when 265    => signal_mode := signal_up;
			when others => signal_mode := signal_none;
		end case;
		--
		--~for index in reverse 0 .. block_count - 1 loop
			--~if  core.cursor.x > block_array (index).x and core.cursor.x < block_array (index).width
			--~and core.cursor.y > block_array (index).y and core.cursor.y < block_array (index).height
			--~and core.cursor_mode = block_array (index).mode then
				--~block_array (index).action.all;
				--~core.cursor_mode := 0;
				--~exit;
			--~end if;
		--~end loop;
		--
		block_count := 0;
		--
		ray.begin_drawing;
		--
		ray.clear_background ((0, 0, 0, 255));
	end synchronize;

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end core;