188 lines
2.9 KiB
NASM
188 lines
2.9 KiB
NASM
include "lang.inc"
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include "macros.inc"
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WND_SIZE_X = 320
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WND_SIZE_Y = 200
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VC_DELTA = 1
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HC_DELTA = 2
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MEOS_APP_START
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CODE
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fninit
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call init_sinus_table
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call init_background
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call init_palette
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mov eax,40
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mov ebx,101b
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int 0x40
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jmp .paint_window
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.event_loop:
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mov eax,23
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mov ebx,1
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int 0x40
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test eax,eax
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je .draw_screen
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dec eax
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je .paint_window
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or eax,-1
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int 0x40
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.draw_screen:
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add word [ver_counter],VC_DELTA
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add word [hor_counter],HC_DELTA
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call handle_animation
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mov eax,7
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mov ebx,virtual_screen_32
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mov ecx,(WND_SIZE_X shl 16)+WND_SIZE_Y
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mov edx,(5 shl 16)+23
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int 0x40
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jmp .event_loop
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.paint_window:
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mov eax,12
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mov ebx,1
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int 0x40
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xor eax,eax
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mov ebx,(100 shl 16)+(WND_SIZE_X+9)
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mov ecx,(100 shl 16)+(WND_SIZE_Y+28)
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mov edx,0x03000000
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int 0x40
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mov eax,7
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mov ebx,virtual_screen_32
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mov ecx,(WND_SIZE_X shl 16)+WND_SIZE_Y
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mov edx,(5 shl 16)+23
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int 0x40
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mov eax,4
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mov ebx,0x00060006
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mov ecx,0x10ffffff
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mov edx,window_title
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mov esi,window_title_len
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int 0x40
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mov eax,12
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mov ebx,2
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int 0x40
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jmp .event_loop
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init_palette:
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mov ecx,256
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mov edi,_palette
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xor eax,eax
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.next_pal:
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mov al,ah
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shr al,2
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stosb
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stosb
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stosb
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inc edi
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inc ah
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loop .next_pal
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ret
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init_sinus_table:
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sub esp,4
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mov ecx,256
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mov edi,sinetable
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.sin_loop:
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fld dword [esp]
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fld st0
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fsin
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fmul [scale_sin]
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fistp word [edi]
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fadd [delta_angle]
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fstp dword [esp]
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add edi,2
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loop .sin_loop
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add esp,4
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ret
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init_background:
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mov edi,background
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xor edx,edx
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.ib_vertical:
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xor ecx,ecx
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.ib_horizontal:
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mov eax,ecx
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xor eax,edx
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stosb
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inc ecx
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cmp ecx,256
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jne .ib_horizontal
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inc edx
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cmp edx,256
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jne .ib_vertical
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ret
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s_OFFX = 0
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s_OFFY = 2
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handle_animation:
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sub esp,4
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mov ebx,[ver_counter]
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and ebx,255
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add ebx,ebx
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mov ax,[sinetable+ebx]
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mov [esp+s_OFFY],ax
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mov ebx,[hor_counter]
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and ebx,255
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add ebx,ebx
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mov ax,[sinetable+ebx]
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mov [esp+s_OFFX],ax
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mov edi,virtual_screen_32
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mov edx,WND_SIZE_Y-1
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.a_ver:
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mov ecx,WND_SIZE_X-1
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mov bx,[esp+s_OFFY]
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add bx,dx
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and ebx,255
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shl ebx,8
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.a_hor:
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mov ax,[esp+s_OFFX]
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add ax,cx
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and eax,255
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lea esi,[background+ebx+eax]
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mov al,[esi]
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and eax,0xff
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mov eax,[_palette+eax*4]
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stosw
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shr eax,16
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stosb
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dec ecx
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jge .a_hor
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dec edx
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jge .a_ver
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add esp,4
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ret
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DATA
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delta_angle dd 0.0245436926066 ; pi/128
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scale_sin dd 128.0
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window_title:
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db 'MoveBack'
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window_title_len = $ - window_title
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UDATA
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ver_counter dd ?
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hor_counter dd ?
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_palette: rd 256
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virtual_screen_32:
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rb WND_SIZE_X*WND_SIZE_Y*3
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background:
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rb 256*256
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sinetable:
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rw 256
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MEOS_APP_END |