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board.asm
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%include "snake.inc"
section .text
global create_food
global draw_food
global draw_block
global draw_snake
global init_snake
global has_collision
global print_snake
global set_direction
global update_score_texture
global update_food
global update_snake
; create the snake from the middle of the scren extending to the left
; rdi Board *
init_snake:
push rbp
mov rbp, rsp
mov eax, dword [rdi + Board.width]
shr eax, 1
mov dword [rdi + Board.snake + Snake.head.x], eax
mov edx, dword [rdi + Board.height]
shr edx, 1
mov dword [rdi + Board.snake + Snake.head.y], edx
; set the tail moving left
mov ecx, 0
; load the body address
mov r8, qword [rdi + Board.snake + Snake.tail]
.set_tail:
cmp ecx, 3
je .end_init_snake
sub eax, 1
mov dword [r8 + (rcx * Point.size) + Point.x], eax
mov dword [r8 + (rcx * Point.size) + Point.y], edx
add ecx, 1
jmp .set_tail
.end_init_snake:
mov dword [rdi + Board.snake + Snake.length], ecx
pop rbp
ret
; rdi Board *
print_snake:
push rbp
mov rbp, rsp
; get the length
mov r14d, dword [ rdi + Board.snake + Snake.length]
; loop through it and print the tail
mov r12, rdi
xor r13, r13
.loop:
cmp r14d, r13d
je .end_loop
lea rdi, [print_snake_str]
mov r8, qword [r12 + Board.snake + Snake.tail]
mov esi, dword [r8 + (r13 * Point.size) + Point.x]
mov edx, dword [r8 + (r13 * Point.size) + Point.y]
xor rcx, rcx
call printf
add r13d, 1
jmp .loop
.end_loop:
pop rbp
ret
; rdi: Board *
has_collision:
push rbx ; counter
; collides with wall
; if head.x
; comp head.x to 0
mov esi, dword [rdi + Board.snake + Snake.head.x]
cmp esi, 0 ; less than zero
jl .true
mov edx, dword [rdi + Board.width]
cmp esi, edx ; greater than the board width
jge .true
mov esi, dword [rdi + Board.snake + Snake.head.y]
cmp esi, 0 ; height less than zero
jl .true
mov edx, dword [rdi + Board.height]
cmp esi, edx ; greater than the board height
jge .true
; collides with tail
mov rsi, qword [rdi + Board.snake + Snake.head]
mov edx, dword [rdi + Board.snake + Snake.length]
mov r8, qword [rdi + Board.snake + Snake.tail]
xor rbx, rbx
.loop:
cmp rbx, rdx
je .loop_end
mov rcx, qword [r8 + (rbx * Point.size)]
cmp rcx, rsi
je .true
add rbx, 1
jmp .loop
.loop_end:
pop rbx
xor eax, eax
ret
.true:
pop rbx
mov eax, 1
ret
; function to create the food from random numbers
; rdi: Board *
create_food:
; compute rand from width and height then store it
; mov the board *
push r12
push r13
mov r12, rdi
call rand
xor edx, edx
mov ecx, dword [ r12 + Board.width]
div ecx
mov dword [ r12 + Board.food.x], edx
mov r13d, edx
call rand
xor edx, edx
mov ecx, dword [ r12 + Board.height]
div ecx
mov dword [ r12 + Board.food.y], edx
pop r13
pop r12
ret
; rdi Board *
update_score_texture:
push rbp
push r12
sub rsp, 8
; mov rbp, rsp
mov r12, rdi
; format the string
lea rdi, qword [r12 + Board.score_buffer]
mov esi, 16
lea rdx, [score_text]
mov ecx, dword [r12 + Board.score]
call SDL_snprintf
; create the text surface
mov rdi, qword [r12 + Board.font]
lea rsi, qword [r12 + Board.score_buffer]
mov edx, 0xffffffff
call TTF_RenderText_Blended
mov rdi, qword [r12 + Board.renderer]
mov rsi, rax
call SDL_CreateTextureFromSurface
mov qword [r12 + Board.score_texture], rax
add rsp, 8
pop r12
pop rbp
ret
; rdi Board *
update_food:
push rbp
mov rbp, rsp
push r12
; check if food colides with the snake head
; if yes update food location and increment score
mov rsi, qword [rdi + Board.snake + Snake.head]
mov rdx, qword [rdi + Board.food]
xor rax, rax
cmp rsi, rdx
jne .end
add dword [rdi + Board.score], 1
add dword [rdi + Board.snake + Snake.length], 1
mov r12, rdi
call update_score_texture
mov rdi, r12
call create_food
.end:
pop r12
leave
ret
; rdi Board *
update_snake:
mov rsi, qword [rdi + Board.direction]
mov edx, dword [rdi + Board.snake + Snake.length] ; size
sub edx, 2
mov r8, qword [rdi + Board.snake + Snake.tail]
.loop:
cmp edx, 0
jl .loop_end
mov rcx, qword [r8 + (rdx * Point.size) ] ; save the current
mov qword [r8 + ((rdx + 1) * Point.size) ], rcx ; move to next
sub edx, 1
jmp .loop
.loop_end:
; move head to start of tail
mov rcx, qword [rdi + Board.snake + Snake.head]
mov qword [r8], rcx
add dword [rdi + Board.snake + Snake.head.x], esi
shr rsi, 32
add dword [rdi + Board.snake + Snake.head.y], esi
ret
; rdi SDL_Renderer *
; rsi Point
; rdx block_size
; rcx SDL_Color
draw_block:
push rbp
mov rbp, rsp
push r12
push rdx
push rsi
mov r12, rdi
mov rax, rcx
mov r10, rax
shr rax, 16
movzx esi, ah
movzx edx, al
movzx r8d, r10b
shr r10d, 8
movzx ecx, r10b
call SDL_SetRenderDrawColor
pop rsi
mov r10d, esi
shr rsi, 32
mov r11d, esi
pop rdx
imul r10d, edx
imul r11d, edx
sub rsp, SDL_Rect.size
mov dword [rsp + SDL_Rect.x], r10d
mov dword [rsp + SDL_Rect.y], r11d
mov dword [rsp + SDL_Rect.w], edx
mov dword [rsp + SDL_Rect.h], edx
mov rdi, r12
lea rsi, [rsp + SDL_Rect]
call SDL_RenderFillRect
add rsp, SDL_Rect.size
pop r12
leave
ret
; rdi SDL_Renderer *
; rsi Point
; rdx block_size
; rcx SDL_Color
draw_block_noscale:
push rbp
mov rbp, rsp
push r12
push rdx
push rsi
mov r12, rdi
mov rax, rcx
mov r10, rax
shr rax, 16
movzx esi, ah
movzx edx, al
movzx r8d, r10b
shr r10d, 8
movzx ecx, r10b
call SDL_SetRenderDrawColor
pop rsi
mov r10d, esi
shr rsi, 32
mov r11d, esi
pop rdx
sub rsp, SDL_Rect.size
mov dword [rsp + SDL_Rect.x], r10d
mov dword [rsp + SDL_Rect.y], r11d
mov dword [rsp + SDL_Rect.w], edx
mov dword [rsp + SDL_Rect.h], edx
mov rdi, r12
lea rsi, [rsp + SDL_Rect]
call SDL_RenderFillRect
add rsp, SDL_Rect.size
pop r12
leave
ret
; rdi Board *
draw_snake:
push r15
push r14
push r13
push r12 ; snake tail
xor r15, r15
mov r14, rdi
mov r13d, dword [r14 + Board.snake + Snake.length]
mov r12, qword [r14 + Board.snake + Snake.tail]
; draw tail
.loop:
cmp r15d, r13d
je .end_loop
mov rdi, [r14 + Board.renderer]
mov rsi, [r12 + (r15 * Point.size)]
mov edx, 20
mov ecx, PASTEL_GREEN
call draw_block
add r15d, 1
jmp .loop
.end_loop:
mov rsi, qword [r12 + (0 * Point.size)]
mov edx, dword [r12 + Point.y]
mov rdi, print_snake_str
call printf
; draw snake head
mov rsi, [r14 + Board.snake + Snake.head]
mov r12, rsi
mov rdi, [r14 + Board.renderer]
mov edx, BLOCK_SIZE
mov ecx, GREEN
call draw_block
mov edx, BLOCK_SIZE
mov rsi, r12
shr rsi, 32
imul esi, edx
add rsi, 4
shl rsi, 32
imul r12d, edx
add r12d, 4
or rsi, r12
mov rdi, [r14 + Board.renderer]
mov edx, BLOCK_SIZE_SMALL
mov ecx, PASTEL_BLUE
call draw_block_noscale
pop r12
pop r13
pop r14
pop r15
ret
; rdi Board *
; rsi byte [ 0,1, 2, 3] up, down, left, right
set_direction:
cmp esi, 4
jg .end
cmp esi, 1
jl .end
xor ebx, ebx
xor edx, edx
sub esi, 1
mov edx, dword [snake_direction + (rsi * Point.size) + Point.x]
mov ecx, dword [snake_direction + (rsi * Point.size) + Point.y]
mov r8d, [rdi + Board.direction.x]
mov r10d, [rdi + Board.direction.y]
neg r8d
cmp r8d, edx
je .end
neg r10d
cmp r10d, ecx
je .end
mov [rdi + Board.direction.x], edx
mov [rdi + Board.direction.y], ecx
.end:
ret
; function to draw the food
; rdi: Board *
draw_food:
mov rsi, [rdi + Board.food]
mov rdi, qword [rdi + Board.renderer]
mov edx, BLOCK_SIZE
mov ecx, YELLOW
jmp draw_block
section .rodata
score_text:
dd "Score: %d"
print_snake_str:
db "(%d, %d),", 0xa
snake_direction: ; x , y
dd 0
dd -1
dd 0
dd 1
dd -1
dd 0
dd 1
dd 0