作成完了

main.s

@@ -8,12 +8,13 @@ default rel
 section .data
 
 section .rodata
-  outfile db "output.ppm", 0
+  basename db "output-",0
+  suffix db ".ppm", 0
   hdr db "P6", 10, "960 540", 10, "255", 10
 
   err db "開くに失敗", 10
   errlen equ $-err
-  suc db "画像を「output.ppm」に出力しました。", 10
+  suc db "60フレームを作成しました。", 10
   suclen equ $-suc
 
   w equ 960
@@ -21,11 +22,35 @@ section .rodata
 
 section .bss
   buf resb 960*540*3
+  outfile resb 64     ; "output-nn.ppm\0"
 
 section .text
   global _start
 
 _start:
+  mov r12, 0          ; i = 0
+
+frameloop:
+  ; ファイル名
+  lea rdi, [outfile]
+  lea rsi, [basename]
+  call strcpy
+
+  ; iは2つの文字に変換
+  mov rax, r12
+  mov rcx, 10
+  xor rdx, rdx
+  div rcx             ; rax = 10, rdx = 01
+
+  add al, '0'
+  add dl, '0'
+  mov [rdi], al  ; 10
+  mov [rdi+1], dl; 01
+  add rdi, 2
+
+  lea rsi, [suffix]
+  call strcpy         ; 「.ppm\0」の追加
+
   mov rax, 5          ; sys_openat
   lea rdi, [outfile]
   mov rsi, 0x100601   ; 0x100601 = 0001 0000 0000 0110 0000 0001 = 1048576 + 1024 + 512 + 1 = 1050113
@@ -51,26 +76,31 @@ _start:
   ; チェッカーボードループ
   lea rdi, [buf]
   mov rcx, h
+  xor r13, r13
 
 yloop:
   mov r8d, w
 
 xloop:
   ; (x/60 + y/60) % 2の計算
-  mov eax, r8d
+  mov eax, r8d        ; x
+  add eax, r12d       ; x + i
   xor edx, edx
   mov ebx, 60
-  div ebx             ; eax = x/60
+  div ebx             ; eax = (x + i)/60
   push rax
 
-  mov eax, ecx
+  mov eax, r13d
+  add eax, r12d       ; y + i
   xor edx, edx
-  div ebx             ; eax = y/60
+  div ebx             ; eax = (y + i)/60
+
   pop rdx
-  add eax, edx        ; x/60 + y/60
+  add eax, edx        ; (x + i)/60 + (y + i)/60
   and al, 1           ; % 2
   jz .black
 
+.green:
   mov al, 0
   stosb               ; R
   mov al, 0xFF
@@ -88,7 +118,10 @@ xloop:
 .next:
   dec r8d
   jnz xloop
-  loop yloop          ; dec rcx, jnz yloop
+
+  inc r13d
+  dec rcx
+  jnz yloop
 
   ; ピクセルデータの書き込み
   mov eax, 4
@@ -97,17 +130,21 @@ xloop:
   mov edx, 960*540*3
   syscall
 
+close:
+  mov rax, 6          ; sys_close
+  mov rdi, r15
+  syscall
+
+  inc r12
+  cmp r12, 60
+  jb frameloop
+
   mov rax, 4
   mov rdi, 1
   lea rsi, [suc]
   mov rdx, suclen
   syscall
 
-close:
-  mov rax, 6          ; sys_close
-  mov rdi, r15
-  syscall
-
 end:
   mov eax, 1          ; sys_exit
   xor edi, edi
@@ -123,3 +160,16 @@ error:
   mov rax, 1
   mov rdi, 1
   syscall
+
+strcpy:
+.loop:
+  mov al, [rsi]
+  mov [rdi], al
+  test al, al
+  jz .done
+  inc rdi
+  inc rsi
+  jmp .loop
+
+.done:
+  ret