mirror of https://github.com/nmlgc/ReC98.git
61 lines
1.2 KiB
NASM
61 lines
1.2 KiB
NASM
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; void tiles_redraw_invalidated();
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public tiles_redraw_invalidated
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tiles_redraw_invalidated proc near
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push si
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push di
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call egc_start_copy_inlined_noframe
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mov ax, GRAM_400
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mov es, ax
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assume es:nothing
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mov bx, offset _halftiles_dirty[TILES_MEMORY_X * (TILE_FLAGS_Y - 1)]
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mov di, ((RES_Y - TILE_FLAG_H) * ROW_SIZE) + PLAYFIELD_VRAM_X
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mov dh, TILE_FLAGS_Y
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mov si, TILES_MEMORY_X * (TILES_Y - 1) * 2
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@@start_row:
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mov dl, TILES_X
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@@dirty?:
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cmp byte ptr [bx], 0
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jz short @@next_tile_in_row
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push si
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mov byte ptr [bx], 0
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mov si, _tile_ring[si]
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test dh, 1
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jnz short @@redraw
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add si, TILE_FLAG_H * ROW_SIZE
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@@redraw:
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mov cx, TILE_FLAG_H
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@@blit_tile_redraw_lines:
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mov ax, es:[si]
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mov es:[di], ax
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add si, ROW_SIZE
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add di, ROW_SIZE
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loop @@blit_tile_redraw_lines
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sub di, TILE_FLAG_H * ROW_SIZE
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pop si
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@@next_tile_in_row:
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add di, 2
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add si, 2
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inc bx
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dec dl
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jnz short @@dirty?
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test dh, 1
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jnz short @@previous_row
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add si, (TILES_MEMORY_X * 2)
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@@previous_row:
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sub si, (TILES_MEMORY_X * 2) + (TILES_X * 2)
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dec dh
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sub bx, TILES_X + TILES_MEMORY_X
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sub di, (TILES_X * 2) + (TILE_FLAG_H * ROW_SIZE)
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jge short @@start_row
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call egc_off
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pop di
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pop si
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retn
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tiles_redraw_invalidated endp
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