135 lines
2.2 KiB
NASM
135 lines
2.2 KiB
NASM
game_pong:
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call .draw_screen
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call .detect_input
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; Clears screen and draws both players and ball
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.draw_screen:
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call os_set_graphics_mode ; Clear screen
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.draw_p1:
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; Player 1
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mov ax, [p1_x]
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mov [x_start], ax
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mov [x_end], ax
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mov bx, [p1_y]
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mov [y_start], bx
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add bx, [bat_height]
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mov [y_end], bx
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call os_draw_graphical_rectangle ; Draw player 1
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.draw_p2:
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; Player 2
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mov ax, [p2_x]
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mov [x_start], ax
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mov [x_end], ax
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mov bx, [p2_y]
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mov [y_start], bx
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add bx, [bat_height]
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mov [y_end], bx
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call os_draw_graphical_rectangle ; Draw player 1
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.draw_ball:
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; The ball
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mov ax, [ball_x]
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mov [x_start], ax
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mov [x_end], ax
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mov bx, [ball_y]
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mov [y_start], bx
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mov [y_end], bx
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call os_draw_graphical_rectangle ; Draw the ball
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ret
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; Player 1 movements
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.p1_up:
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mov dx, [p1_y]
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sub dx, 5
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mov [p1_y], dx
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ret
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.p1_down:
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mov dx, [p1_y]
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add dx, 5
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mov [p1_y], dx
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ret
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; Player 2 movements
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.p2_up:
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mov dx, [p2_y]
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sub dx, 5
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mov [p2_y], dx
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ret
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.p2_down:
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mov dx, [p2_y]
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add dx, 5
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mov [p2_y], dx
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ret
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; Ball bouncing
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; This should move the ball along one frame
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; The ball moves 1 pixel per frame, however this is usually
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; at an angle, so we need sin and cos
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.bounce_ball:
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; Change the x coords
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fld dword [ball_angle]
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fcos
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fld dword [precise_ball_x]
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faddp
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frndint
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fstp dword [ball_x]
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; Change the y coords
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fld dword [ball_angle]
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fsin
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fld dword [precise_ball_y]
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faddp
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frndint
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fstp dword [ball_y]
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ret
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.detect_input:
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call os_read_input
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cmp al, 08h
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je .finish
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; Player 1
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cmp al, 77h ; Pressed 'w' (player 1 up)
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call .p1_up
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cmp al, 73h ; Pressed 's' (player 1 down)
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call .p1_down
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; Player 2
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cmp al, 5bh ; Pressed '[' (player 2 up)
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call .p2_up
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cmp al, 27h ; Pressed ''' (player 2 down)
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call .p2_down
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;call .bounce_ball
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call .draw_screen
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jmp .detect_input
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.finish:
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call os_set_text_mode
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call os_start_cli
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section .data
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ball_x dw 100
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ball_y dw 100
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precise_ball_x dw 100
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precise_ball_y dw 100
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ball_angle dw 1 ; In radians
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cos_ball_angle dw 0
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sin_ball_angle dw 0
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p1_x dw 5
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p1_y dw 5
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p2_x dw 315
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p2_y dw 5
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bat_height dw 20
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