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Routines |
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This renders the complete screen by plotting all vertical columns in turn.
Used by the routines at pick_up_item and reset_outdoors.
Note: Exits with banked registers active.
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| plot_all_tiles | A8A2 | LD DE,$F0F8 | Point DE at the 24x17 visible tiles array ("tile_buf") | |
| A8A5 | EXX | Bank | ||
| A8A6 | LD HL,$FF58 | Point HL' at the 7x5 supertile indices buffer ("map_buf") | ||
| A8A9 | LD DE,$F290 | Point DE' at the 24x17x8 screen buffer ("window_buf") | ||
| A8AC | LD A,($81BB) | Get map X position | ||
| A8AF | LD B,$18 | Set 24 iterations (screen columns) | ||
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Start loop
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| plot_all_tiles_0 | A8B1 | PUSH BC | Preserve the loop counter | |
| A8B2 | PUSH DE | Preserve the screen buffer pointer | ||
| A8B3 | PUSH HL | Preserve the supertile indices pointer | ||
| A8B4 | PUSH AF | Preserve the map X position | ||
| A8B5 | EXX | Unbank | ||
| A8B6 | PUSH DE | Preserve the visible tiles pointer | ||
| A8B7 | EXX | Bank | ||
| A8B8 | CALL plot_vertical_tiles_common | Plot a complete column of tiles | ||
| A8BB | EXX | Unbank | ||
| A8BC | POP DE | Restore and advance the visible tiles pointer | ||
| A8BD | INC DE | |||
| A8BE | EXX | Bank | ||
| A8BF | POP AF | Restore the map X position | ||
| A8C0 | POP HL | Restore the supertile indices pointer | ||
| A8C1 | INC A | Advance the map X position | ||
| A8C2 | LD C,A | Save the result in C | ||
| A8C3 | AND $03 | If the X position hits a multiple of 4 advance to the next supertile | ||
| A8C5 | JR NZ,plot_all_tiles_1 | |||
| A8C7 | INC HL | |||
| plot_all_tiles_1 | A8C8 | LD A,C | Restore the map X position | |
| A8C9 | POP DE | Restore and advance the screen buffer pointer to the next column | ||
| A8CA | INC DE | |||
| A8CB | POP BC | Restore the loop counter | ||
| A8CC | DJNZ plot_all_tiles_0 | ...loop | ||
| A8CE | RET | Return | ||
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