diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/fruit.asm | 54 | ||||
| -rw-r--r-- | src/input.asm | 19 | ||||
| -rw-r--r-- | src/main.asm | 107 |
3 files changed, 130 insertions, 50 deletions
diff --git a/src/fruit.asm b/src/fruit.asm new file mode 100644 index 0000000..31226af --- /dev/null +++ b/src/fruit.asm @@ -0,0 +1,54 @@ +section .data + + ; position of the fruit + global fruit_x + global fruit_y + fruit_x db 0 + fruit_y db 0 + +section .text + global draw_fruit + global spawn_fruit + extern width + extern height + extern reset_cursor + extern write_byte + extern move_cursor_right + extern move_cursor_down + +spawn_fruit: + + ; x position + rdtsc + shr ax, 5 + div byte [width] + mov byte [fruit_x], ah +;; TODO + rdtsc + shr ax, 5 + div byte [height] + mov byte [fruit_y], ah + + ret + +draw_fruit: + push rbx + call reset_cursor + mov bh, byte [fruit_x] + mov bl, byte [fruit_y] + +_30:call move_cursor_right + dec bh + cmp bh, 0 + jnz _30 +_31:call move_cursor_down + dec bl + cmp bl, 0 + jnz _31 + + mov rax, '*' + call write_byte + + pop rbx + call reset_cursor + ret diff --git a/src/input.asm b/src/input.asm index 278b640..f411eed 100644 --- a/src/input.asm +++ b/src/input.asm @@ -1,5 +1,5 @@ section .bss - input_buffer resb 1 + input_buffer resb 250 section .text global input @@ -13,6 +13,7 @@ input: handle_input: mov al, byte [input_buffer] + mov ah, byte [direction] cmp al, 'w' je _input_up cmp al, 's' @@ -26,15 +27,31 @@ handle_input: ret _input_up: + cmp ah, 1 + jnz _set_up + ret +_set_up: mov byte [direction], 3 ret _input_down: + cmp ah, 3 + jnz _set_down + ret +_set_down: mov byte [direction], 1 ret _input_left: + cmp ah, 0 + jnz _set_left + ret +_set_left: mov byte [direction], 2 ret _input_right: + cmp ah, 2 + jnz _set_right + ret +_set_right: mov byte [direction], 0 ret diff --git a/src/main.asm b/src/main.asm index 170f6a2..559e4bd 100644 --- a/src/main.asm +++ b/src/main.asm @@ -9,12 +9,8 @@ section .data ; array of snake - 1000 thousand bytes means max length is 500 ; x head is at snake[0] ; y head is at snake[1] - snake TIMES 1000 db 0 - snake_length dw 1 - - ; position of the fruit - fruit_x db 0 - fruit_y db 0 + snake TIMES 250 db 0 + snake_length db 2 ; direction of the snake: ; 3 @@ -23,6 +19,7 @@ section .data global direction direction db 0 + ; delay of the game loop (0.5s in the beginning) timespec dq 0 dq 500000000 @@ -31,10 +28,14 @@ section .rodata ; (without the borders) global width global height - width db 70 - height db 30 + width db 25 + height db 10 section .text + extern fruit_x + extern fruit_y + extern spawn_fruit + extern draw_fruit extern input extern draw_border extern write_byte @@ -49,27 +50,52 @@ section .text draw_snake: push rbx + ;;push r12 + xor rdx, rdx + + push rdx call reset_cursor - mov bh, byte [snake] - mov bl, byte [snake+1] + pop rdx -_10:call move_cursor_right +_12: + mov bh, byte [snake+(2*rdx)] + mov bl, byte [snake+(2*rdx)+1] + +_10:push rdx + call move_cursor_right + pop rdx dec bh cmp bh, 0 jnz _10 -_11:call move_cursor_down +_11:push rdx + call move_cursor_down + pop rdx dec bl cmp bl, 0 jnz _11 + push rdx mov rax, 'x' call write_byte + call reset_cursor + pop rdx + inc rdx + cmp dl, byte [snake_length] + jnz _12 + + ;;pop r12 pop rbx - call reset_cursor ret move_snake: + ;; TODO: loop this + mov ah, byte [snake] + mov al, byte [snake+1] + mov byte [snake+2], ah + mov byte [snake+3], al + ;; + cmp byte [direction], 0 je _move_right cmp byte [direction], 1 @@ -78,7 +104,7 @@ move_snake: je _move_left cmp byte [direction], 3 je _move_up - ret + ret ; should not be accessed _move_right: inc byte [snake] @@ -93,48 +119,29 @@ _move_up: dec byte [snake+1] ret -fruit_position: - - ; x position - rdtsc - shr ax, 5 - div byte [width] - mov byte [fruit_x], ah -;; TODO - rdtsc - shr ax, 5 - div byte [height] - mov byte [fruit_y], ah - +check_eat_fruit: + mov ah, byte [fruit_x] + mov al, byte [fruit_y] + cmp byte [snake], ah + jz _check_y ret - -draw_fruit: - push rbx - call reset_cursor - mov bh, byte [fruit_x] - mov bl, byte [fruit_y] - -_30:call move_cursor_right - dec bh - cmp bh, 0 - jnz _30 -_31:call move_cursor_down - dec bl - cmp bl, 0 - jnz _31 - - mov rax, '*' - call write_byte - - pop rbx - call reset_cursor +_check_y: + cmp byte [snake+1], al + jz _same_position + ret +_same_position: + ; get longer + inc byte [snake_length] + call spawn_fruit ret _start: call hide_cursor mov byte [snake], 5 mov byte [snake+1], 5 - call fruit_position + mov byte [snake+2], 4 + mov byte [snake+3], 5 + call spawn_fruit main_loop: call clear_screen @@ -149,11 +156,13 @@ main_loop: call input call move_snake + call check_eat_fruit jmp main_loop exit: ; exit syscall with return code 0 call show_cursor + call clear_screen mov rax, 60 xor rdi, rdi syscall |