rectangles work

.gitignore

@@ -0,0 +1 @@
+*.swp

build-linux.sh

@@ -66,5 +66,5 @@ mkisofs -quiet -V 'MIKEOS' -input-charset iso8859-1 -o disk_images/crawos.iso -b
 
 echo '>>> Done!'
 
-sudo qemu-system-i386 -drive file=disk_images/crawos.flp,index=0,if=floppy,format=raw
+qemu-system-i386 -drive file=disk_images/crawos.flp,index=0,if=floppy,format=raw
 

source/features/cli.asm

@@ -6,12 +6,12 @@ os_start_cli:
 	mov si, prompt
 	call os_print_string
 
+	mov ax, 20
+
 	mov di, user_input
 
 	call os_display_input
 
-	popa
-	ret
 
 ; ------------------------------------------------
 
@@ -26,21 +26,53 @@ os_read_cli:
 	mov di, help_string
 	call os_compare_strings
 	cmp cl, 1
-	je print_help_text
+	je help
+
+	mov si, user_input
+	mov di, clear_string
+	call os_compare_strings
+	cmp cl, 1
+	je clear
+	
+	mov si, user_input
+	mov di, pong_string
+	call os_compare_strings
+	cmp cl, 1
+	je pong
+
+	jmp .unkown
+
+.unkown:
+	mov si, unknown_command
+	call os_print_string
+	mov si, user_input
+	call os_print_string_nl
+	jmp .finish
 
 .finish:
+	popa
 	call os_start_cli
 
-print_help_text:
+clear:
+	call os_set_text_mode
+	call os_read_cli.finish
+
+help:
 	mov si, help_text
 	call os_print_string_nl
 	call os_read_cli.finish
 
+pong:
+	call game_pong
+	call os_read_cli.finish
 
-user_input times 20 db 0
+section .data
-prompt db 'CrawOS: ', 0
+	user_input times 20 db 0
-help_string db 'HELP', 0
+	prompt_length db 20
-help_text db 'This is CrawOS, type "HELP" for help', 0
+	prompt db 'CrawOS: ', 0
-command_result_text db 'You typed: ', 0
+	help_string db 'HELP', 0
-true db 'TRUE', 0
+	clear_string db 'CLEAR', 0
-false db 'FALSE', 0
+	pong_string db 'PONG', 0
+	help_text db 'This is CrawOS, type "HELP" for help, "CLEAR" to clear the screen', 0
+	command_result_text db 'You typed: ', 0
+	unknown_command db 'Error: Unkown Command.. ', 0

source/features/graphics.asm

@@ -0,0 +1,48 @@
+os_set_graphics_mode:
+	pusha
+
+	mov ah, 00h
+	mov al, 13h
+	int 10h
+
+	popa
+	ret
+
+; --------------------------------------
+
+; x_end
+; y_end
+; x_start
+; y_start
+; colour
+os_draw_graphical_rectangle:
+	pusha
+
+	; Tell BIOS we're changing 'da pixels!
+	mov ah, 0Ch
+
+	mov al, 1100b
+
+	mov cx, [x_start]
+	mov dx, [y_start]
+
+	jmp .x_loop
+
+	.x_loop:
+		int 10h
+		cmp cx, [x_end]
+		je .next_row
+		inc cx
+		call .x_loop
+
+	.next_row:
+		mov cx, [x_start]
+		cmp dx, [y_end]
+		je .finish
+		inc dx					; Increase Row
+		call .x_loop
+
+	.finish:
+		popa
+		Iret
+

source/features/screen.asm

@@ -1,15 +1,4 @@
-; ==================================================================
+; SI = pointer to start of string to be printed
-; MikeOS -- The Mike Operating System kernel
-; Copyright (C) 2006 - 2021 MikeOS Developers -- see doc/LICENSE.TXT
-;
-; SCREEN HANDLING SYSTEM CALLS
-; ==================================================================
-
-; ------------------------------------------------------------------
-; os_print_string -- Displays text
-; IN: SI = message location (zero-terminated string)
-; OUT: Nothing (registers preserved)
-
 os_print_string:
 	pusha
 
@@ -29,7 +18,8 @@ os_print_string:
 
 ; Exact same as the above procedure, but this adds a newline 
 ; after priting, similar to the difference between Rust's print! and println!
-os_print_string_nl:				pusha
+os_print_string_nl:				
+	pusha
 
 	mov ah, 0Eh			; int 10h teletype function, we're telling the BIOS we will print something
 
@@ -51,34 +41,32 @@ os_print_string_nl:				pusha
 os_print_newline:
 	pusha
 	
-	mov ah, 03h
+	mov ah, 0Eh
+	mov al, 13
 	int 10h
-	
+	mov al, 10
-	mov ah, 02h
-	add dh, 1
-	mov dl, 0
 	int 10h
 
 	popa
 	ret
 
-
 ; -------------------------------------------
 
-os_clear_screen:
+os_set_text_mode:
-        pusha
+	pusha
-
+	; Set mode = 80x25 (text mode)
 	mov ah, 00h
-	mov al, 03h 		; Set video mode to textmode (80x25). 16 colors, 8 pages
+	mov al, 03h
 	int 10h
 
+	; Move cursor to the top left
 	mov ah, 02h
 	mov dh, 0
 	mov dl, 0
 	int 10h
 
-        popa
+	popa
-        ret
+	ret
 
 ; -------------------------------------------
 
@@ -100,13 +88,15 @@ os_read_input:
 
 os_display_input:	
 	pusha
+	mov cx, [prompt_length] 
 
+.loop:
 	call .check_key_pressed
 
-        jmp os_display_input
+	jmp .loop
 
 .check_key_pressed:	
-        call os_read_input
+	call os_read_input
 
 	cmp al, 08h
 	je .backspace
@@ -117,8 +107,12 @@ os_display_input:
 	cmp al, 1Bh
 	je .esc_key
 
+	cmp cx, 0
+	jb .check_key_pressed
+
 	call .print_current_input
-	ret
+	dec cx
+	jmp .check_key_pressed
 
 .esc_key:
 	call os_reboot
@@ -126,11 +120,14 @@ os_display_input:
 .enter_key:
 	mov al, 0
 	stosb
-	mov di, user_input
+	popa
-	
 	call os_read_cli
 
 .backspace:
+	call .move_cursor_back			; then .move_cursor_back
+	call .loop				; Else .loop
+
+.move_cursor_back:
 	mov ah, 0Eh
 
 	mov al, 08h

source/features/screen.asm~

@@ -0,0 +1,162 @@
+; ==================================================================
+; MikeOS -- The Mike Operating System kernel
+; Copyright (C) 2006 - 2021 MikeOS Developers -- see doc/LICENSE.TXT
+;
+; SCREEN HANDLING SYSTEM CALLS
+; ==================================================================
+
+; ------------------------------------------------------------------
+; os_print_string -- Displays text
+; IN: SI = message location (zero-terminated string)
+; OUT: Nothing (registers preserved)
+
+os_print_string:
+	pusha
+
+	mov ah, 0Eh			; int 10h teletype function, we're telling the BIOS we will print something
+
+.repeat:
+	lodsb				; Get char from si into al
+	cmp al, 0			; Compare al to 0
+	je .done			; If char is zero, end of string
+
+	int 10h				; Otherwise, print it
+	jmp .repeat			; And move on to next char
+
+.done:
+	popa
+	ret
+
+; Exact same as the above procedure, but this adds a newline 
+; after priting, similar to the difference between Rust's print! and println!
+os_print_string_nl:				pusha
+
+	mov ah, 0Eh			; int 10h teletype function, we're telling the BIOS we will print something
+
+.repeat:
+	lodsb				; Get char from si into al
+	cmp al, 0			; Compare al to 0
+	je .done			; If char is zero, end of string
+
+	int 10h				; Otherwise, print it
+	jmp .repeat			; And move on to next char
+
+.done:
+	call os_print_newline
+	popa
+	ret
+
+; --------------------------------------------
+
+os_print_newline:
+	pusha
+
+	mov ah, 03h
+	int 10h
+	
+	mov ah, 02h
+	add dh, 1
+	mov dl, 0
+	int 10h
+	
+	popa
+	ret
+		
+
+; -------------------------------------------
+
+os_clear_screen:
+        pusha
+
+	mov ah, 00h
+	mov al, 03h 		; Set video mode to textmode (80x25). 16 colors, 8 pages
+	int 10h
+
+	mov ah, 02h
+	mov dh, 0
+	mov dl, 0
+	int 10h
+
+        popa
+        ret
+
+; -------------------------------------------
+
+; AX = key pressed
+os_read_input:
+	mov ah, 11h			; BIOS call to check for key
+	int 16h				; Interrupt
+	jnz .key_pressed		; Jump if input isn't 0
+	
+	hlt
+	jmp os_read_input
+
+.key_pressed:
+	mov ah, 10h
+	int 16h
+	ret
+
+; -------------------------------------------
+
+os_display_input:	
+	pusha
+	mov cx, prompt_length ; Characters remaining
+	
+.loop:
+	call .check_key_pressed
+
+        jmp .loop
+
+.check_key_pressed:	
+        call os_read_input
+
+	cmp al, 08h
+	je .backspace
+
+	cmp al, 0Dh
+	je .enter_key
+
+	cmp al, 1Bh
+	je .esc_key
+
+	dec cx
+	call .print_current_input
+	ret
+
+.esc_key:
+	call os_reboot
+
+.enter_key:
+	mov al, 0
+	stosb
+	mov di, user_input
+	popa
+	call os_read_cli
+
+.backspace:
+	cmp cx, prompt_length			; If bx < 20
+	jl .move_cursor_back			; then .move_cursor_back
+	call .loop				; Else .loop
+
+.move_cursor_back:
+	mov ah, 0Eh
+
+	mov al, 08h
+	int 10h
+	mov al, 20h
+	int 10h
+	mov al, 08h
+	int 10h
+
+	dec di
+	inc cx
+	jmp os_display_input
+
+.print_current_input:
+	stosb
+	
+	mov ah, 0Eh
+	int 10h
+
+
+	ret

source/games/pong.asm

@@ -0,0 +1,27 @@
+game_pong:
+	pusha
+
+	call os_set_graphics_mode
+
+	call os_draw_graphical_rectangle
+
+	call os_set_text_mode
+	jmp .finish
+
+.detect_input:
+	call os_read_input
+	cmp al, 08h
+	je .finish
+	jmp .detect_input
+
+.finish:
+	call os_set_text_mode
+	popa
+	ret
+
+section .data
+	x_start dw 5
+	y_start dw 5
+	x_end dw 30
+	y_end dw 46	
+	colour db 1100b

source/kernel.asm

@@ -37,7 +37,8 @@ os_main:
 	je no_change
 
 no_change:
-	call print_help_text
+	mov si, help_text
+	call os_print_string_nl
 	call os_start_cli
 
 bootdev db 0
@@ -64,6 +65,11 @@ Sides dw 2
 	%INCLUDE "features/cli.asm"
 	%INCLUDE "features/power.asm"
 	%INCLUDE "features/strings.asm"
+	%INCLUDE "features/graphics.asm"
+	%INCLUDE "features/sound.asm"
+
+; GAMES
+	%INCLUDE "games/pong.asm"
 
 ; ==================================================================
 ; END OF KERNEL