| Ant Attack | Routines |
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Used by the routine at BUILD_PLANES.
For each of the 512 places in PLANES, write the height's bit there if the gathered cell at the same offset from DE has a block at that height. Called for the heights in order, lowest first, so a higher block overwrites a lower one.
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| MARK_PLANE | 8180 | LD B,$80 | 128 times four places. | |||||||
| 8182 | LD HL,PLANES | |||||||||
| MARK_PLANE_0 | 8185 | LD A,(DE) | A block at this height in the cell: mark the place. | |||||||
| 8186 | AND C | |||||||||
| 8187 | JR Z,MARK_PLANE_1 | |||||||||
| 8189 | LD (HL),C | |||||||||
| MARK_PLANE_1 | 818A | INC L | ||||||||
| 818B | INC E | |||||||||
| 818C | LD A,(DE) | |||||||||
| 818D | AND C | |||||||||
| 818E | JR Z,MARK_PLANE_2 | |||||||||
| 8190 | LD (HL),C | |||||||||
| MARK_PLANE_2 | 8191 | INC L | ||||||||
| 8192 | INC E | |||||||||
| 8193 | LD A,(DE) | |||||||||
| 8194 | AND C | |||||||||
| 8195 | JR Z,MARK_PLANE_3 | |||||||||
| 8197 | LD (HL),C | |||||||||
| MARK_PLANE_3 | 8198 | INC L | ||||||||
| 8199 | INC E | |||||||||
| 819A | LD A,(DE) | |||||||||
| 819B | AND C | |||||||||
| 819C | JR Z,MARK_PLANE_4 | |||||||||
| 819E | LD (HL),C | |||||||||
| MARK_PLANE_4 | 819F | INC HL | ||||||||
| 81A0 | INC DE | |||||||||
| 81A1 | DJNZ MARK_PLANE_0 | |||||||||
| 81A3 | RET | |||||||||
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