421 lines
9.9 KiB
NASM
421 lines
9.9 KiB
NASM
;"Web" demo for KolibriOS, version 0.3
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;Copyright Alexander Meshcheryakov (Self-Perfection), 2009
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;Contact me: alexander.s.m@gmail.com
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;distributed under BSD license
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;Used assumptions:
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; 1) Screen resolution does not change while app is running
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; 2) Screen width bigger than height
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; 3) Screen width and height are even (2*k)
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include '../../../macros.inc'
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background_cl = 0x000000
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foreground_cl = 0xFFFFFF
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delay = 4
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; debug = 1
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MEOS_APP_START
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CODE
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;Preinit. Randomize start counter
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mcall 3
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mov [initial_counter], eax ;init with system time
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;Query screen size
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mcall 14
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add eax, 0x00010001
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mov dword [y_max], eax ;store x_max and y_max
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shr eax, 1
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mov dword [radius], eax ;store radius and x_center
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;Calc line_number
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mov ax, [y_max]
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mov dx, 0
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mov bx, 5
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div bx
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mov word [half_line_number], ax
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movzx edx, ax ;edx = half_line_number
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imul edx, 2 * line_coords_element_size ;Space needed for line_coords_array
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;Demand memory
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mcall 68, 11 ; Init heap
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test eax, eax ; Is heap successfully inited?
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jnz @f
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mcall -1 ; Netu pamjati?! Nu i nahuj vas
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@@:
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movzx ecx, [y_max]
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inc ecx
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movzx eax, [x_max]
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imul ecx, eax ;[Remember to left here space for 1-2 emergency lines at bottom]
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add ecx, edx ;And add space for line_coords_array
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mcall 68, 12,
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test eax, eax ; Did we get something non zero?
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jnz @f
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mcall -1
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@@:
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mov [line_coords_array_pointer], eax
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add eax, edx
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mov [image_pointer], eax
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call clear_offscreen_bitmap
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;Calc fixed line ends coords
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fninit
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fldpi
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fidiv word [half_line_number] ;Now st0 contains angle step of line start points
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mov eax, [line_coords_array_pointer] ;cleanup: comment
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movzx ecx, word [half_line_number]
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shl ecx, 1
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fld st ;skip zero angle to avoid 1px fixed line at right side
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calculate_next_line_start_point:
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fld st
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;Calculate line start points coords
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fsincos
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fimul [radius]
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fiadd [x_center]
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fistp word [eax+start_x_offset]
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; fchs ;affects direction, uncomment with corresponding line below
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fimul [radius]
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fiadd [radius]
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fistp word [eax+start_y_offset]
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;Calculate line start point pointer
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movzx ebx, word [eax+start_y_offset]
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movzx edx, word [x_max]
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imul ebx, edx
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movzx edx, word [eax+start_x_offset]
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add ebx, edx
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add ebx, [image_pointer]
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mov [eax+line_start_pointer_offset], ebx
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fadd st0, st1
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add eax, line_coords_element_size ;Move to next element in line_coords_array
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loop calculate_next_line_start_point
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fstp st0 ;drop current angle
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fidiv [divider] ;change angle step
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draw_window:
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;Start line coords calculation
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fld st ;skip zero angle to avoid 1px fixed line at right side
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;Use time since start to get current counter value
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mcall 26, 9
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add eax, [initial_counter]
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mov [current_counter], eax
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mov eax, [line_coords_array_pointer] ;cleanup: comment
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movzx ecx, word [half_line_number]
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shl ecx, 1
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calculate_next_line_end_point:
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fld st
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;Calculate line end points
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fimul [current_counter]
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fsincos
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fimul [radius]
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fiadd [x_center]
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fistp word [eax+2]
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; fchs ;affects direction, uncomment with corresponding line above
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fimul [radius]
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fiadd [radius]
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fistp word [eax+6]
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fadd st0, st1
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add eax, line_coords_element_size ;Move to next element in line_coords_array
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loop calculate_next_line_end_point
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fstp st0 ;drop current angle
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inc dword [initial_counter]
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; *********************************************
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; *******Draw lines on offscreen bitmap********
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; *********************************************
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;draw end points
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movzx edi, [half_line_number]
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shl edi, 1
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mov esi, [line_coords_array_pointer]
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draw_next_line:
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if defined debug ;Draw red points next to line ends in debug mode
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movzx ebx, word [esi+start_y_offset]
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movzx eax, word [x_max]
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imul eax, ebx
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movzx ebx, word [esi+start_x_offset]
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add eax, ebx
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add eax, dword [image_pointer]
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inc eax
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mov [eax], byte red_cl_index
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movzx ebx, word [esi+end_y_offset]
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movzx eax, word [x_max]
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imul eax, ebx
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movzx ebx, word [esi+end_x_offset]
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add eax, ebx
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add eax, dword [image_pointer]
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inc eax ;Move one right to make more visible
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mov [eax], byte red_cl_index
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end if
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;Drawing lines. Need to keep esi and edi values in process
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mov eax, [esi+line_start_pointer_offset]
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check_horizontal_line:
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mov bx, word [esi+start_y_offset]
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cmp bx, word [esi+end_y_offset]
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jnz general_draw_line ;Jump to next test if dy!=0
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pusha
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movzx ecx, word [esi+end_x_offset]
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sub cx, word [esi+start_x_offset]
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jnc @f
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neg cx
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sub eax, ecx
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@@:
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cld
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inc cx
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mov edi, eax
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mov al, foreground_cl_index
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rep stos byte [edi]
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popa
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jmp line_drawing_end
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;General line draw algorithm. Based on Bresenham's algorithm (below) but heavily optimized
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; function line(x0, x1, y0, y1)
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; boolean steep := abs(y1 - y0) > abs(x1 - x0)
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; if steep then
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; swap(x0, y0)
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; swap(x1, y1)
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; if x0 > x1 then
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; swap(x0, x1)
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; swap(y0, y1)
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; int deltax := x1 - x0
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; int deltay := abs(y1 - y0)
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; int error := deltax / 2
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; int ystep
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; int y := y0
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; if y0 < y1 then ystep := 1 else ystep := -1
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; for x from x0 to x1
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; if steep then plot(y,x) else plot(x,y)
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; error := error - deltay
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; if error < 0 then
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; y := y + ystep
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; error := error + deltax
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general_draw_line:
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pusha
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;init step_base and step_secondary
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mov edx, esi
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mov esi, 1
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movzx edi, word [x_max]
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;calc initial delta_base & delta_secondary values
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movzx ebx, word [edx+end_x_offset]
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sub bx, [edx+start_x_offset]
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jnc @f
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neg bx
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neg esi
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@@:
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movzx ecx, word [edx+end_y_offset]
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sub cx, [edx+start_y_offset]
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jnc @f
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neg cx
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neg edi
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@@:
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;compare abs(y1 - y0) and abs(x1 - x0)
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cmp bx, cx
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jnc @f
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xchg ebx, ecx
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xchg esi, edi
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@@:
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shl ebx, 16
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mov bx, cx
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rol ebx, 16
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mov cx, bx ;init counter
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inc cx
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mov dx, bx ;init error
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shr dx, 1
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rol ebx, 16
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;At current point:
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;eax = current point pointer
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;ebx = (delta_base shl 16) + delta_secondary
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;ecx = counter
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;[e]dx = error
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;esi = step_base
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;edi = step_secondary
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brasenham_plot_point:
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mov byte [eax], foreground_cl_index
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add eax, esi
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sub dx, bx
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jnc end_loop
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; y := y + ystep
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; error := error + deltax
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change_y:
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add eax, edi
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rol ebx, 16
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add dx, bx
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rol ebx, 16
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end_loop:
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loopw brasenham_plot_point
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end_bresenham:
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popa
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line_drawing_end:
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add esi, line_coords_element_size ;Move to next element in line_coords_array
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dec edi
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jnz draw_next_line
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; *********************************************
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; ******* WINDOW DEFINITIONS AND DRAW ********
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; *********************************************
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; mcall 18, 14 ;Wait for scanning (it seems doesn't do any good now)
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; start redraw (without calling 12 proc our window overwrites window that above it)
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mcall 12, 1
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xor eax,eax
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movzx ebx, [x_max]
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movzx ecx, [y_max]
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mov edx, 0x01000000 ;Window style ;Draw nothing
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; mov edx, 0x00000000 ;Window style
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; mov esi, 0x00000000 ;Header color (prevent odd color line on top of window in random cases)
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mcall ;Define window
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mov ebp, 0
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mov ecx, dword [y_max]
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mcall 65, [image_pointer], , <0,0>, 8, palette
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mcall 12, 2 ; end redraw
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call clear_offscreen_bitmap
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wait_event:
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mcall 23, delay
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; mcall 10
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test eax, 0xFFFF - 1 ;Test for 0 (delay passed) or 1 (redraw) event
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jz draw_window ; Delay passed or redraw event
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dec eax
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dec eax
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jnz exit ; If not key then Alt+F4
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; key pressed, read it and ignore
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mcall 2
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cmp ah, 27 ; Test Esc key press in ASCII
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jne wait_event
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; button pressed; we have only one button, close
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; also seems to handle Alt+F4
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exit:
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mcall -1
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clear_offscreen_bitmap:
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mov edi, [image_pointer]
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movzx ecx, [y_max]
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movzx eax, [x_max]
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imul ecx, eax
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shr ecx, 2 ;dword is 4 bytes
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mov eax, 0
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rep stos dword [edi]
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ret
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DATA
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divider dw 5000
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palette:
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background_cl_index = 0
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dd background_cl
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foreground_cl_index = 1
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dd foreground_cl
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if defined debug
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red_cl_index = 2
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dd 0x00FF0000 ;Cleanup this!
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end if
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UDATA
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image_pointer dd ?
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initial_counter dd ?
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current_counter dd ? ;counter + current time
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half_line_number dw ?
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y_max dw ? ; screen size
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x_max dw ?
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radius dw ?
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x_center dw ?
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line_coords_array_pointer dd ?
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; line_coords_array:
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; repeat 1000 ;line_number
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; dw ? ;start_x
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; dw ? ;end_x
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; dw ? ;start_y
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; dw ? ;end_y
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; dd ? ;line_start_pointer
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; end repeat
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start_x_offset = 0
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end_x_offset = 2
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start_y_offset = 4
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end_y_offset = 6
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line_start_pointer_offset = 8
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line_coords_element_size = 12
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MEOS_APP_END |