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Routines |
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Floods 7th - 23rd rows of attribute file with attribute value in byte at HL+1.
Used by the routine at 27762.
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| 27951 | INC HL | Advance HL to room attribute... | ||
| 27952 | LD A,(HL) | ...load into A... | ||
| 27953 | LD (23446),A | ...and store at 23446 | ||
| 27956 | INC HL | Advance HL to floor attribute | ||
| 27957 | PUSH HL | Store HL (points to floor attribute data) | ||
| 27958 | LD H,A | Load room attribute into both bytes of HL... | ||
| 27959 | LD L,A | ... | ||
| 27960 | CALL 28716 | Wait for interrupt then flood 7th - 23rd rows of attribute file with attribute in HL | ||
| 27963 | LD HL,20704 | Load HL with display file address corresponding to (0, 23) (characters)... | ||
| 27966 | LD (54110),HL | ...and move bitmap virtual text cursor here | ||
| 27969 | POP HL | Restore HL (points to floor attribute data) | ||
| 27970 | LD A,(HL) | Load floor attribute into A... | ||
| 27971 | LD (23695),A | ...and store at 23695 | ||
| 27974 | INC HL | Advance HL to floor UDG code... | ||
| 27975 | LD A,(HL) | ...load into A... | ||
| 27976 | LD (54235),A | ...and also load into operand of instruction at 54234 | ||
| 27979 | LD HL,32 | Load HL with 32 as we need to draw across 32 character blocks | ||
| 27982 | CALL 54231 | Draw run of 32 characters (i.e. draw the room's floor) | ||
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The operand of the instruction at 27985 represents the address of start of room layout data for the current room. This is modified by the instruction at 27891.
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| 27985 | LD IX,0 | Load IX with start address of room layout data for current room | ||
| 27989 | LD A,(IX+0) | Load first byte of room layout data instruction | ||
| 27992 | OR A | If this byte is zero (i.e. last entry so no more painting to do)... | ||
| 27993 | JP Z,28101 | ...then draw all objects and characters in current room, draw Magic Knight, set action flags and validate I.D. card, then return | ||
| 27996 | CP 252 | If this byte is 252 or more... | ||
| 27998 | JP NC,29060 | ...then skip IX over current room layout data entry and jump back to 27989 for next one | ||
| 28001 | INC IX | Advance to RLE attribute data index and load into L... | ||
| 28003 | LD L,(IX+0) | ... | ||
| 28006 | INC IX | Advance to RLE terrain interaction data index and load into E... | ||
| 28008 | LD E,(IX+0) | ... | ||
| 28011 | INC IX | Advance to x-coordinate... | ||
| 28013 | LD A,(IX+0) | ... | ||
| 28016 | LD (23493),A | ...and store at 23493 | ||
| 28019 | INC IX | Advance to y-coordinate... | ||
| 28021 | LD A,(IX+0) | ... | ||
| 28024 | LD (23494),A | ...and store at 23494 | ||
| 28027 | LD H,0 | Load H with zero (RLE attribute data index already in L)... | ||
| 28029 | ADD HL,HL | ...and multiply by four... | ||
| 28030 | ADD HL,HL | ... | ||
| 28031 | LD BC,51997 | Point BC at start of lookup table for RLE attribute data (room layout graphics)... | ||
| 28034 | ADD HL,BC | ...and add HL as offset, loading result into HL | ||
| 28035 | EX DE,HL | Swap DE (now points to entry in RLE attribute lookup table at 51997) and HL (L now RLE terrain interaction data index) | ||
| 28036 | LD H,0 | Load H with zero (RLE terrain interaction data index already in L)... | ||
| 28038 | ADD HL,HL | ...and multiply by four... | ||
| 28039 | ADD HL,HL | ... | ||
| 28040 | LD BC,52397 | Point BC at start of lookup table for RLE terrain interaction data (room layout graphics)... | ||
| 28043 | ADD HL,BC | ...and add HL as offset, loading result into HL | ||
| 28044 | EX DE,HL | Swap DE and HL | ||
| 28045 | PUSH DE | Store DE (pointer to required entry in RLE terrain interaction lookup table) | ||
| 28046 | INC IX | Advance to mirror options... | ||
| 28048 | LD A,(IX+0) | ...and load into A | ||
| 28051 | PUSH IX | Store IX (current position in room layout data) | ||
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The following jumps handle the painting of the current room layout data entry's attribute and terrain interaction data. After this painting is completed, IX is advanced to the start of the next room layout data entry and a jump back to 27989 occurs to process this next entry.
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| 28053 | OR A | Paint room layout data entry's attributes and terrain interaction data applying appropriate mirrors, then process next entry | ||
| 28054 | JP Z,28938 | |||
| 28057 | CP 1 | |||
| 28059 | JP Z,28906 | |||
| 28062 | CP 2 | |||
| 28064 | JP Z,28874 | |||
| 28067 | JP 28846 | |||
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