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draw_road.asm
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243 lines (228 loc) · 3.63 KB
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.no $0200
; STACK .eq $2
; PC_MAIN .eq $3
; PC_SUB .eq $4
; PC_SUBSUB .eq $5
; R_CUR_PAGE .eq $6
; R_TABLE_PTR .eq $A
R_DRAW_WORK1_PTR .eq $B
.do FLAG_COLOR<>0
R_COLOR_PTR .eq $C
R_COLOR_WORK .eq $D
.fi
A_L .eq $D ; higher byte: lower base address, lower byte: length
R_DRAW_WORK_PTR .eq $E
R_DRAW_SCR_PTR .eq $F
DRAW_ROAD
GHI R_CUR_PAGE
PHI R_DRAW_SCR_PTR
.do FLAG_COLOR<>0
LDI COLOR_PAGE
PHI R_COLOR_PTR
.fi
LDI WORK_PAGE
PHI R_DRAW_WORK_PTR
PHI R_DRAW_WORK1_PTR
LDI /BITPAT_RIGHT
PHI R_TABLE_PTR
LDI $02
DRAW_ROAD_L0
STR STACK ; M(STACK) = y (counter)
PLO R_DRAW_WORK_PTR ; points to LINE_DATA + y (LINE_DATA is assumed to be (WORK_PAGE << 8))
SHL
SHL
SHL
ADI $80
PHI A_L ; lower base address in the screen
; draw right half
LDN R_DRAW_WORK_PTR
SDI $1E
SEX STACK
SM
SM
PLO A_L ; (A_L).0 = 30-line_data[y]-2y
ANI $80
BNZ DRAW_LEFT_0 ; if line_data[y]+2y > 30, skip
GLO A_L
SMI $3F
BNF DRAW_RIGHT_S0 ; if (255 >=) 30-line_data[y]-2y >= 63, D := 30-line_data[y]-2y - 63
LDI 00 ; else, D := 0
DRAW_RIGHT_S0
ADI $40
PLO A_L ; (A_L).0 = 31-line_data[y]-2y
; right
GHI A_L
ADI $07
PLO R_DRAW_SCR_PTR
SEX R_DRAW_SCR_PTR
DRAW_RIGHT_L0
GLO A_L
SMI $08
BNF DRAW_RIGHT_S1
PLO A_L
LDI $FF
STXD
BR DRAW_RIGHT_L0
DRAW_RIGHT_S1
ADI $08
BZ DRAW_LEFT_0
ADI #BITPAT_RIGHT
PLO R_TABLE_PTR
LDN R_TABLE_PTR
STR R_DRAW_SCR_PTR
DRAW_LEFT_0
LDN R_DRAW_WORK_PTR
ADI $1F
SEX STACK
SM
SM
PLO A_L
ANI $80
BNZ DRAW_DOT_0
GLO A_L
SMI $3F
BNF DRAW_LEFT_S0
LDI 00
DRAW_LEFT_S0
ADI $40
PLO A_L
; left
GHI A_L
PLO R_DRAW_SCR_PTR
SEX R_DRAW_SCR_PTR
DRAW_LEFT_L0
GLO A_L
SMI $08
BNF DRAW_LEFT_S1
PLO A_L
LDI $FF
STR R_DRAW_SCR_PTR
INC R_DRAW_SCR_PTR
BR DRAW_LEFT_L0
DRAW_LEFT_S1
ADI $08
BZ DRAW_DOT_0
ADI #BITPAT_LEFT
PLO R_TABLE_PTR
LDN R_TABLE_PTR
STR R_DRAW_SCR_PTR
DRAW_DOT_0
LDN STACK
ADI #CENTER_DATA
PLO R_DRAW_WORK_PTR
LDN R_DRAW_WORK_PTR
BZ DRAW_ROAD_FINAL
ADI $01
BZ DRAW_GOAL ; if $FF (goal line)
LDN STACK
PLO R_DRAW_WORK_PTR
LDN R_DRAW_WORK_PTR
ADI $20
PLO A_L
SMI $40
BDF DRAW_ROAD_FINAL
; dot
GHI A_L
PLO R_DRAW_SCR_PTR
GLO A_L
SHR
SHR
SHR
SEX STACK
DEC STACK
STR STACK
GLO R_DRAW_SCR_PTR
ADD
INC STACK
PLO R_DRAW_SCR_PTR
GLO A_L
ANI $07
ADI #BITPAT_DOT
PLO R_TABLE_PTR
LDN R_TABLE_PTR
SEX R_DRAW_SCR_PTR
OR
STR R_DRAW_SCR_PTR
BR DRAW_ROAD_FINAL
DRAW_GOAL
GHI A_L
ADI $07
PLO R_DRAW_SCR_PTR
SEX R_DRAW_SCR_PTR
LDI $FF
STXD
STXD
STXD
STXD
STXD
STXD
STXD
STXD
DRAW_ROAD_FINAL
LDN STACK
SMI $0F
BZ DRAW_DIST_SPEED
ADI $10
BR DRAW_ROAD_L0
DRAW_DIST_SPEED
LDI /DRAW_BAR_SUBSUB_ENTRY
PHI PC_SUBSUB
LDI #DRAW_BAR_SUBSUB_ENTRY
PLO PC_SUBSUB
.do FLAG_COLOR=0
LDI $00 ; line 0, leftmost byte
.el
LDI $10 ; line 2, leftmost byte
.fi
PLO R_DRAW_SCR_PTR
LDI #V_DIST_CAR
PLO R_DRAW_WORK_PTR
LDN R_DRAW_WORK_PTR
SHR
SHR
ADI $01
PLO A_L
SEP PC_SUBSUB
.do FLAG_COLOR=0
LDI $10 ; line 2, leftmost byte
.el
LDI $18 ; line 3, leftmost byte
.fi
PLO R_DRAW_SCR_PTR
LDI #V_SPEED
PLO R_DRAW_WORK_PTR
LDN R_DRAW_WORK_PTR
PLO A_L
SEP PC_SUBSUB
SEP PC_MAIN
.no $0300
; call with R_DRAW_SCR_PTR = start address, A_L = length
DRAW_BAR_SUBSUB_RET
SEP PC_SUB
DRAW_BAR_SUBSUB_ENTRY
SEX R_DRAW_SCR_PTR
DRAW_BAR_L0
GLO A_L
SMI $08
BNF DRAW_BAR_S0
PLO A_L
LDI $FF
STR R_DRAW_SCR_PTR
INC R_DRAW_SCR_PTR
BR DRAW_BAR_L0
DRAW_BAR_S0
ADI $08
BZ DRAW_BAR_SUBSUB_RET
ADI BITPAT_LEFT
PLO R_TABLE_PTR
LDN R_TABLE_PTR
STR R_DRAW_SCR_PTR
DRAW_BAR_EXIT
BR DRAW_BAR_SUBSUB_RET
.no $0320
BITPAT_RIGHT
.db $00, $01, $03, $07, $0F, $1F, $3F, $7F
BITPAT_LEFT
.db $00, $80, $C0, $E0, $F0, $F8, $FC, $FE
BITPAT_DOT
.db $80, $40, $20, $10, $08, $04, $02, $01