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Routines |
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Used by the routine at OBJECT_DONE.
Called by the main loop (OBJECT_DONE) once every object has been updated. Writes into DRAW_LIST the number (0-53) of every record in use whose draw flag, bit 4 of +$07, is set, in record order, and an $FF after the last. RENDER_DYNAMIC_OBJECTS wipes the objects' old places from this list and SORT_AND_DRAW draws from it.
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| LIST_DRAWN | B531 | PUSH IX | 54 records from OBJECTS; HL = the list; C = the number | |
| B533 | LD B,$36 | |||
| B535 | LD DE,$0020 | |||
| B538 | LD IX,OBJECTS | |||
| B53C | LD HL,DRAW_LIST | |||
| B53F | LD C,$00 | |||
| LIST_DRAWN_0 | B541 | LD A,(IX+$00) | an empty record: not listed | |
| B544 | AND A | |||
| B545 | JR Z,LIST_DRAWN_1 | |||
| B547 | BIT 4,(IX+$07) | not to be drawn this turn | ||
| B54B | JR Z,LIST_DRAWN_1 | |||
| B54D | LD (HL),C | list its number | ||
| B54E | INC HL | |||
| LIST_DRAWN_1 | B54F | INC C | the next record | |
| B550 | ADD IX,DE | |||
| B552 | DJNZ LIST_DRAWN_0 | |||
| B554 | LD A,$FF | end the list | ||
| B556 | LD (HL),A | |||
| B557 | POP IX | |||
| B559 | RET | |||
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