333 lines
8.7 KiB
ArmAsm
Executable File
333 lines
8.7 KiB
ArmAsm
Executable File
********************************
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* Display map routines: *
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********************************
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* Default values:
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WSCREEN = 24
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HSCREEN = 20
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WMAP = 48
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HMAP = 32
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********************************
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* Get the value of map @ (x,y) *
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********************************
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MAPINDEX DEX
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DEY
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STX XOFF
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STY YOFF
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LDA #0
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STA XOFF+1
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STA YOFF+1
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LDA MAPSW
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BMI :NOMONS
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*-------------------------------
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LDY #0
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:REPEAT LDA M_HP,Y ; if HP = 0, no monster at this
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BEQ :CHECK ; location.
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LDA M_LEVEL,Y ; check if monster is on the
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CMP MAPADDR+1 ; correct level
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BNE :CHECK
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LDA M_X,Y ; check x-coordinate against
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CMP XOFF ; map x-coordinate.
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BNE :CHECK
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LDA M_Y,Y ; check y-coordinate
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CMP YOFF
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BNE :CHECK
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LDA XOFF ; ensure that map x and map y
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ORA YOFF ; are not both 0 (no monster)
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BEQ :CHECK
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LDA M_TYPE,Y ; get the monster type!
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STY MAP_MNUM
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RTS ; have mons type, so exit
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:CHECK INY
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CPY #MONSMAX
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BLT :REPEAT
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*-------------------------------
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:NOMONS IMULW YOFF;#WMAP;PTR
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ADDW PTR;MAPADDR;PTR
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LDY XOFF
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LDA (PTR),Y
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RTS
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MAP_MNUM HEX 00
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********************************
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* Update Screen *
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********************************
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UPSCREEN MOVB X0;AX
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MOVB Y0;AY
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MOVB CX;X0
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MOVB CY;Y0
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MOVB CX;X1
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MOVB CY;Y1
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LDA #%10000000
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STA CLRFLAG
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LDA #%00000000
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STA XORFLAG
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:0 LDA Y0
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CMP #2
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BLT :1
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DEC Y0
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LDX CX
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LDY Y0
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JSR MAPCHECK
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BCC :0
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:1 LDA X0
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CMP #2
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BLT :2
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DEC X0
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LDX X0
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LDY CY
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JSR MAPCHECK
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BCC :1
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:2 LDA X1
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CMP #WMAP+1
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BGE :3
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INC X1
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LDX X1
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LDY CY
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JSR MAPCHECK
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BCC :2
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:3 LDA Y1
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CMP #HMAP+1
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BGE :4
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INC Y1
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LDX CX
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LDY Y1
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JSR MAPCHECK
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BCC :3
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:4 SEC
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LDA Y1
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SBC Y0
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CMP #HSCREEN-1
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BLT :5
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SEC
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LDA CY
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SBC Y0
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STA TEMP0
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SEC
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LDA Y1
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SBC CY
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CMP TEMP0
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BLT :40
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DEC Y1
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JMP :4
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:40 INC Y0
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JMP :4
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:5 SEC
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LDA X1
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SBC X0
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CMP #WSCREEN-1
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BLT :6
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SEC
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LDA CX
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SBC X0
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STA TEMP0
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SEC
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LDA X1
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SBC CX
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CMP TEMP0
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BLT :50
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DEC X1
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JMP :5
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:50 INC X0
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JMP :5
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:6 SUBB X1;X0;WX
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SUBB Y1;Y0;WY
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LDA WX
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LSR
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STA ZX
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SEC
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LDA #WSCREEN/2
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SBC ZX
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STA ZX
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LDA WY
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LSR
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STA ZY
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SEC
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LDA #HSCREEN/2
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SBC ZY
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STA ZY
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LDA OX
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ORA OY
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BPL :7
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MOVB ZX;OX
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MOVB ZY;OY
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JSR HCLEAR
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JMP :8
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:7 LDA #%10000000 ; to erase old picture
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STA XORFLAG ; of Meltok ...
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LDA #%00000000
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STA CLRFLAG
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MOVB #2;SNUM
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LDA CH:X+1 ; Should be current location
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LDX CH:X ; of Meltok on screen.
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LDY CH:Y ; Including "sliding" movement.
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JSR DRAWSHAP ; Draw it
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LDA #%00000000 ; Clear reverse flag
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STA XORFLAG ; Done.
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LDA #%10000000
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STA CLRFLAG
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SUBB AX;X0;DX
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SUBB AY;Y0;DY
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SUBB OX;DX;NX
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SUBB OY;DY;NY
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:70 LDA NX
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BPL :71
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JSR HRIGHT
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INC NX
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JMP :70
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:71 LDA NY
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BPL :72
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JSR HDOWN
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INC NY
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JMP :71
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:72 CLC
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LDA NY
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ADC WY
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CMP #19
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BLT :73
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JSR HUP
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DEC NY
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JMP :72
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:73 CLC
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LDA NX
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ADC WX
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CMP #24
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BLT :74
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JSR HLEFT
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DEC NX
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JMP :73
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:74 MOVB NX;ZX
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MOVB NY;ZY
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MOVB ZX;OX
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MOVB ZY;OY
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:8 MOVB Y0;TEMPY
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:_NEXTY MOVB X0;TEMPX
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:_NEXTX LDY TEMPY
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LDX TEMPX
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JSR MAPINDEX
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CMP #15 ; show monsters too!
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BLT :SHGOOD
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CMP #98
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BNE :NEXTSH1
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LDA #1
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JMP :SHGOOD
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:NEXTSH1 CMP #99
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BNE :NEXTSH2
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LDA #6
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JMP :SHGOOD
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:NEXTSH2 CMP #97
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BNE :NEXTSH3
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LDA #4
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JMP :SHGOOD
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:NEXTSH3 CMP #100
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BLT :NEXTSH4
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LDA #0
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JMP :SHGOOD
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:NEXTSH4 CMP #22 ; barred door
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BEQ :SHGOOD
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:NEXTSH5 LDA #15 ; circle -- for errors
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:SHGOOD STA SNUM
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NILB XPLACE+1
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NILB YPLACE+1
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MOVB ZX;XPLACE
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MOVB ZY;YPLACE
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LDY #3
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:MUL8 ASL XPLACE
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ROL XPLACE+1
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ASL YPLACE
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ROL YPLACE+1
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DEY
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BNE :MUL8
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LDA SNUM
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CMP #12
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BLT :MOREYET
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CMP #14+1
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BGE :MOREYET
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LDY MAP_MNUM
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LDA YPLACE
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STA M_Y0,Y
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LDA XPLACE
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STA M_X0,Y
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LDA XPLACE+1
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STA M_X1,Y
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:MOREYET LDY YPLACE
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LDX XPLACE
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LDA XPLACE+1
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JSR DRAWSHAP
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LDA TEMPX
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CMP CX
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BNE :99
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LDA TEMPY
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CMP CY
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BNE :99
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LDA #%00000000
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STA CLRFLAG
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LDA #%10000000
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STA XORFLAG
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MOVB #2;SNUM
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LDY YPLACE
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LDX XPLACE
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LDA XPLACE+1
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JSR DRAWSHAP
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MOVW XPLACE;CH:X
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MOVW YPLACE;CH:Y
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LDA #%00000000
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STA XORFLAG
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LDA #%10000000
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STA CLRFLAG
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:99 INC ZX
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INC TEMPX
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LDA TEMPX
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CMP #WMAP
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BEQ :9999
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BGE :100
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:9999 CMP X1
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BLT :NEXTX
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BEQ :NEXTX
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:100 SUBB ZX;WX;ZX
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DEC ZX
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INC ZY
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INC TEMPY
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LDA TEMPY
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CMP #HMAP
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BEQ :1111
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BGE :EXIT
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:1111 CMP Y1
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BLT :NEXTY
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BEQ :NEXTY
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JMP :EXIT
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:NEXTY JMP :_NEXTY
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:NEXTX JMP :_NEXTX
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:EXIT RTS
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********************************
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* Map Check verifies that the *
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* check square is valid to *
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* see through. *
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********************************
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MAPSW HEX 00
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MAPCHECK LDA #$80 ; special switch to ignore the
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STA MAPSW ; monsters!
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JSR MAPINDEX ; get data
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PHA ; save data
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LDA #0 ; reset switch to normal
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STA MAPSW ; ...
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PLA ; restore data and work with it:
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CMP #99
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BGE :GOOD
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CMP #0
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BEQ :GOOD
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CMP #6
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BLT :BAD
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CMP #12 ; for monsters #12-#14
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BGE :BAD
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:GOOD CLC
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RTS
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:BAD SEC
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RTS
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