Pong

I forgot to commit for a while and I haven't done much, but got the very basics of the game pong working.

Signed-off-by: deadvey <deadvey@deadvey.com>

source/games/pong_old.asm

@@ -0,0 +1,86 @@
+game_pong:
+	pusha
+	call os_set_graphics_mode
+	jmp .draw_player_1
+	jmp .draw_player_2
+	jmp .detect_inputi
+.draw_player_1:
+	; X coords
+	mov ax, [p1_x]
+	mov [x_start], ax
+	mov [x_end], ax
+
+	; Y coords
+	mov bx, [p1_y]
+	mov [y_start], bx
+	add bx, [bat_height] ; Add the bat height to the y coord
+	mov [y_end], b
+	call os_draw_graphical_rectangle
+	ret
+.draw_player_2:
+	; X coords
+	mov ax, [p2_x]
+	mov [x_start], ax
+	mov [x_end], ax
+
+	; Y coords
+	mov bx, [p2_y]
+	mov [y_start], bx
+	add bx, [bat_height] ; Add the bat height to the y coord
+	mov [y_end], bx
+
+	call os_draw_graphical_rectangle
+	ret
+.detect_input:
+	call os_read_input
+	; Exit if backspace is pressed
+	cmp al, 08h
+	je .finish
+	; Go up when you press 'w'
+	cmp al, 77h
+	je .p1_up
+	; Go up when you press 's'
+	cmp al, 73h
+	je .p1_down
+
+	; Loop back
+	jmp .detect_input
+.p1_down:
+	; X coords
+	mov ax, [p1_x]
+	mov [x_start], ax
+	mov [x_end], ax
+
+	; Y coords
+	mov bx, [p1_y]
+	add bx, 5 ; Move the bat down 5
+	mov [y_start], bx
+	add bx, [bat_height] ; Add the bat height to the y coord
+	mov [y_end], bx
+
+	call os_draw_graphical_rectangle
+	ret
+.p1_up:
+    mov ax, [move_distance]
+	sub ax, [p1_y]
+	call os_draw_graphical_rectangle
+	ret
+.finish:
+	call os_set_text_mode
+	popa
+	ret
+
+section .data
+	x_start dw 0
+	y_start dw 0
+	x_end dw 0
+	y_end dw 0
+
+	p1_y dw 5
+	p2_y dw 0
+	p1_x dw 5
+	p2_x dw 30
+
+	bat_height dw 20
+	move_distance dw 5
+	colour db 1111b