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2e97329250cf2a61c21184bd8b85daed74e5e307
alttpr-baserom/utilities.asm
cassidy 2e97329250 Refactor inventory code and add more labels 
Refactored highest sword, shield, and mail counting
Refactored how heart pieces, heart containers, and crystals are counted
Moved quickswap lock bit to high byte of InventoryTracking
Fixed sword and shield item downgrade
Added PreFluteLocations counter
2021-12-07 20:49:58 -05:00

751 lines
24 KiB
NASM
Raw Blame History

;================================================================================
; Utility Functions
;================================================================================
!PROGRESSIVE_SHIELD = "$7EF416" ; ss-- ----
;--------------------------------------------------------------------------------
; GetSpriteTile
; in: A - Loot ID
; out: A - Sprite GFX ID
;--------------------------------------------------------------------------------
GetSpriteID:
JSR AttemptItemSubstitution
CMP.b #$16 : BEQ .bottle ; Bottle
CMP.b #$2B : BEQ .bottle ; Red Potion w/bottle
CMP.b #$2C : BEQ .bottle ; Green Potion w/bottle
CMP.b #$2D : BEQ .bottle ; Blue Potion w/bottle
CMP.b #$3C : BEQ .bottle ; Bee w/bottle
CMP.b #$3D : BEQ .bottle ; Fairy w/bottle
CMP.b #$48 : BEQ .bottle ; Gold Bee w/bottle
CMP.b #$6D : BEQ .server_F0 ; Server Request F0
CMP.b #$6E : BEQ .server_F1 ; Server Request F1
CMP.b #$6F : BEQ .server_F2 ; Server Request F2
BRA .normal
.bottle
PHA : JSR.w CountBottles : CMP.l BottleLimit : !BLT +
PLA : LDA.l BottleLimitReplacement
JMP GetSpriteID
+
PLA : BRA .normal
.server_F0
JSL.l ItemVisualServiceRequest_F0
BRA .normal
.server_F1
JSL.l ItemVisualServiceRequest_F1
BRA .normal
.server_F2
JSL.l ItemVisualServiceRequest_F2
.normal
PHX
PHB : PHK : PLB
;--------
TAX : LDA.l .gfxSlots, X ; look up item gfx
PLB : PLX
CMP.b #$F8 : !BGE .specialHandling
RTL
.specialHandling
CMP.b #$F9 : BNE ++ ; Progressive Magic
LDA.l MagicConsumption : BNE +++
LDA.b #$3B : RTL ; Half Magic
+++
LDA.b #$3C : RTL ; Quarter Magic
++ CMP.b #$FA : BNE ++ ; RNG Item (Single)
JSL.l GetRNGItemSingle : JMP GetSpriteID
++ CMP.b #$FB : BNE ++ ; RNG Item (Multi)
JSL.l GetRNGItemMulti : JMP GetSpriteID
++ CMP.b #$FD : BNE ++ ; Progressive Armor
LDA ArmorEquipment : CMP.l ProgressiveArmorLimit : !BLT + ; Progressive Armor Limit
LDA.l ProgressiveArmorReplacement
JMP GetSpriteID
+
LDA.b #$04 : RTL
++ CMP.b #$FE : BNE ++ ; Progressive Sword
LDA SwordEquipment
CMP.l ProgressiveSwordLimit : !BLT + ; Progressive Sword Limit
LDA.l ProgressiveSwordReplacement
JMP GetSpriteID
+ : CMP.b #$00 : BNE + ; No Sword
LDA.b #$43 : RTL
+ : CMP.b #$01 : BNE + ; Fighter Sword
LDA.b #$44 : RTL
+ : CMP.b #$02 : BNE + ; Master Sword
LDA.b #$45 : RTL
+ ; CMP.b #$03 : BNE + ; Tempered Sword
LDA.b #$46 : RTL
+
++ : CMP.b #$FF : BNE ++ ; Progressive Shield
LDA !PROGRESSIVE_SHIELD : AND #$C0 : LSR #6
CMP.l ProgressiveShieldLimit : !BLT + ; Progressive Shield Limit
LDA.l ProgressiveShieldReplacement
JMP GetSpriteID
+ : CMP.b #$00 : BNE + ; No Shield
LDA.b #$2D : RTL
+ : CMP.b #$01 : BNE + ; Fighter Shield
LDA.b #$20 : RTL
+ ; Everything Else
LDA.b #$2E : RTL
++ : CMP.b #$F8 : BNE ++ ; Progressive Bow
LDA BowEquipment : INC : LSR
CMP.l ProgressiveBowLimit : !BLT +
LDA.l ProgressiveBowReplacement
JMP GetSpriteID
+ : CMP.b #$00 : BNE + ; No Bow
LDA.b #$29 : RTL
+ ; Any Bow
LDA.b #$2A : RTL
++
RTL
;DATA - Loot Identifier to Sprite ID
{
.gfxSlots
db $06, $44, $45, $46, $2D, $20, $2E, $09
db $09, $0A, $08, $05, $10, $0B, $2C, $1B
db $1A, $1C, $14, $19, $0C, $07, $1D, $2F
db $07, $15, $12, $0D, $0D, $0E, $11, $17
db $28, $27, $04, $04, $0F, $16, $03, $13
db $01, $1E, $10, $00, $00, $00, $00, $00
db $00, $30, $22, $21, $24, $24, $24, $23
db $23, $23, $29, $2A, $2C, $2B, $03, $03
db $34, $35, $31, $33, $02, $32, $36, $37
db $2C, $43, $0C, $38, $39, $3A, $F9, $3C
; db $2C, $06, $0C, $38, $FF, $FF, $FF, $FF
;5x
db $44 ; Safe Master Sword
db $3D, $3E, $3F, $40 ; Bomb & Arrow +5/+10
db $2C, $00, $00 ; 3x Programmable Item
db $41 ; Upgrade-Only Silver Arrows
db $24 ; 1 Rupoor
db $47 ; Null Item
db $48, $48, $48 ; Red, Blue & Green Clocks
db $FE, $FF ; Progressive Sword & Shield
;6x
db $FD, $0D ; Progressive Armor & Gloves
db $FA, $FB ; RNG Single & Multi
db $F8, $F8 ; Progressive Bow x2
db $FF, $FF, $FF, $FF ; Unused
db $49, $4A, $49 ; Goal Item Single, Multi & Alt Multi
db $39, $39, $39 ; Server Request F0, F1, F2
;7x
db $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21, $21 ; Free Map
;8x
db $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16, $16 ; Free Compass
;9x
db $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22, $22 ; Free Big Key
;Ax
db $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F, $0F ; Free Small Key
db $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49 ; Unused
db $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49 ; Unused
db $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49 ; Unused
db $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49 ; Unused
db $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49, $49 ; Reserved
}
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; GetSpritePalette
; in: A - Loot ID
; out: A - Palette
;--------------------------------------------------------------------------------
GetSpritePalette:
JSR AttemptItemSubstitution
CMP.b #$16 : BEQ .bottle ; Bottle
CMP.b #$2B : BEQ .bottle ; Red Potion w/bottle
CMP.b #$2C : BEQ .bottle ; Green Potion w/bottle
CMP.b #$2D : BEQ .bottle ; Blue Potion w/bottle
CMP.b #$3C : BEQ .bottle ; Bee w/bottle
CMP.b #$3D : BEQ .bottle ; Fairy w/bottle
CMP.b #$48 : BEQ .bottle ; Gold Bee w/bottle
BRA .notBottle
.bottle
PHA : JSR.w CountBottles : CMP.l BottleLimit : !BLT +
PLA : LDA.l BottleLimitReplacement
JMP GetSpritePalette
+
PLA : .notBottle
PHX
PHB : PHK : PLB
;--------
TAX : LDA.l .gfxPalettes, X ; look up item gfx
PLB : PLX
CMP.b #$F8 : !BGE .specialHandling
RTL
.specialHandling
CMP.b #$FD : BNE ++ ; Progressive Sword
LDA SwordEquipment
CMP.l ProgressiveSwordLimit : !BLT + ; Progressive Sword Limit
LDA.l ProgressiveSwordReplacement
JMP GetSpritePalette
+ : CMP.b #$00 : BNE + ; No Sword
LDA.b #$04 : RTL
+ : CMP.b #$01 : BNE + ; Fighter Sword
LDA.b #$04 : RTL
+ : CMP.b #$02 : BNE + ; Master Sword
LDA.b #$02 : RTL
+ ; Everything Else
LDA.b #$08 : RTL
++ : CMP.b #$FE : BNE ++ ; Progressive Shield
LDA !PROGRESSIVE_SHIELD : AND #$C0 : LSR #6
CMP.l ProgressiveShieldLimit : !BLT + ; Progressive Shield Limit
LDA.l ProgressiveShieldReplacement
JMP GetSpritePalette
+ : CMP.b #$00 : BNE + ; No Shield
LDA.b #$04 : RTL
+ : CMP.b #$01 : BNE + ; Fighter Shield
LDA.b #$02 : RTL
+ ; Everything Else
LDA.b #$08 : RTL
++ : CMP.b #$FF : BNE ++ ; Progressive Armor
LDA ArmorEquipment : CMP.l ProgressiveArmorLimit : !BLT + ; Progressive Armor Limit
LDA.l ProgressiveArmorReplacement
JMP GetSpritePalette
+ : CMP.b #$00 : BNE + ; Green Tunic
LDA.b #$04 : RTL
+ ; Everything Else
LDA.b #$02 : RTL
++ : CMP.b #$FC : BNE ++ ; Progressive Gloves
LDA GloveEquipment : BNE + ; No Gloves
LDA.b #$02 : RTL
+ ; Everything Else
LDA.b #$08 : RTL
++ : CMP.b #$F8 : BNE ++ ; Progressive Bow
LDA BowEquipment : INC : LSR
CMP.l ProgressiveBowLimit : !BLT +
LDA.l ProgressiveBowReplacement
JMP GetSpritePalette
+ : CMP.b #$00 : BNE + ; No Bow
LDA.b #$08 : RTL
+ ; Any Bow
LDA.b #$02 : RTL
++ : CMP.b #$FA : BNE ++ ; RNG Item (Single)
JSL.l GetRNGItemSingle : JMP GetSpritePalette
++ : CMP.b #$FB : BNE ++ ; RNG Item (Multi)
JSL.l GetRNGItemMulti : JMP GetSpritePalette
++
RTL
;DATA - Loot Identifier to Sprite Palette
{
.gfxPalettes
db $00, $04, $02, $08, $04, $02, $08, $02
db $04, $02, $02, $02, $04, $04, $04, $08
db $08, $08, $02, $02, $04, $02, $02, $02
db $04, $02, $04, $02, $08, $08, $04, $02
db $0A, $02, $04, $02, $04, $04, $00, $04
db $04, $08, $02, $02, $08, $04, $02, $08
db $04, $04, $08, $08, $08, $04, $02, $08
db $02, $04, $08, $02, $04, $04, $02, $02
db $08, $08, $02, $04, $04, $08, $08, $08
db $04, $04, $04, $02, $08, $08, $08, $08
; db $04, $0A, $04, $02, $FF, $FF, $FF, $FF
db $04 ; Safe Master Sword
db $08, $08, $08, $08 ; Bomb & Arrow +5/+10
db $04, $00, $00 ; Programmable Items 1-3
db $02 ; Upgrade-Only Silver Arrows
db $06 ; 1 Rupoor
db $02 ; Null Item
db $02, $04, $08 ; Red, Blue & Green Clocks
db $FD, $FE, $FF, $FC ; Progressive Sword, Shield, Armor & Gloves
db $FA, $FB ; RNG Single & Multi
db $F8, $F8 ; Progressive Bow
db $00, $00, $00, $00 ; Unused
db $08, $08, $08 ; Goal Item Single, Multi & Alt Multi
db $04, $04, $04 ; Server Request F0, F1, F2
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Free Map
db $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04, $04 ; Free Compass
;db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; *EVENT*
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Free Big Key
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Free Small Key
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Unused
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Unused
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Unused
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Unused
db $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08, $08 ; Unused
}
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; IsNarrowSprite
; in: A - Loot ID
; out: Carry - 0 = Full, 1 = Narrow
;--------------------------------------------------------------------------------
IsNarrowSprite:
PHA : PHX
PHB : PHK : PLB
JSR AttemptItemSubstitution
;--------
CMP.b #$16 : BEQ .bottle ; Bottle
CMP.b #$2B : BEQ .bottle ; Red Potion w/bottle
CMP.b #$2C : BEQ .bottle ; Green Potion w/bottle
CMP.b #$2D : BEQ .bottle ; Blue Potion w/bottle
CMP.b #$3C : BEQ .bottle ; Bee w/bottle
CMP.b #$3D : BEQ .bottle ; Fairy w/bottle
CMP.b #$48 : BEQ .bottle ; Gold Bee w/bottle
BRA .notBottle
.bottle
JSR.w CountBottles : CMP.l BottleLimit : !BLT +
LDA.l BottleLimitReplacement
JSL.l IsNarrowSprite
JMP .done
+ : JMP .continue
.notBottle
CMP.b #$5E : BNE ++ ; Progressive Sword
LDA SwordEquipment : CMP.l ProgressiveSwordLimit : !BLT + ; Progressive Sword Limit
LDA.l ProgressiveSwordReplacement
JSL.l IsNarrowSprite
JMP .done
+ : JMP .continue
++ CMP.b #$5F : BNE ++ ; Progressive Shield
LDA !PROGRESSIVE_SHIELD : AND #$C0 : BNE + : SEC : JMP .done ; No Shield
+ : LSR #6 : CMP.l ProgressiveShieldLimit : !BLT .continue
LDA.l ProgressiveShieldReplacement
JSL.l IsNarrowSprite
JMP .done
++ CMP.b #$60 : BNE ++ ; Progressive Armor
LDA ArmorEquipment : CMP.l ProgressiveArmorLimit : !BLT .continue
LDA.l ProgressiveArmorReplacement
JSL.l IsNarrowSprite
JMP .done
+
++ CMP.b #$62 : BNE ++ ; RNG Item (Single)
JSL.l GetRNGItemSingle : JMP .continue
++ CMP.b #$63 : BNE ++ ; RNG Item (Multi)
JSL.l GetRNGItemMulti
++ CMP.b #$64 : BEQ + ; Progressive Bow
CMP.b #$65 : BNE .continue ; Progressive Bow (alt)
+ : LDA BowEquipment : INC : LSR
CMP.l ProgressiveBowLimit : !BLT +
LDA.l ProgressiveBowReplacement
JSL.l IsNarrowSprite
JMP .done
.continue
;--------
LDX.b #$00 ; set index counter to 0
;----
-
CPX.b #$24 : !BGE .false ; finish if we've done the whole list
CMP.l .smallSprites, X : BNE + ; skip to next if we don't match
;--
SEC ; set true state
BRA .done ; we're done
;--
+
INX ; increment index
BRA - ; go back to beginning of loop
;----
.false
CLC
.done
PLB : PLX : PLA
RTL
;DATA - Half-Size Sprite Markers
{
.smallSprites
db $04, $07, $08, $09, $0A, $0B, $0C, $13
db $15, $18, $24, $2A, $34, $35, $36, $42
db $43, $45, $59, $A0, $A1, $A2, $A3, $A4
db $A5, $A6, $A7, $A8, $A9, $AA, $AB, $AC
db $AD, $AE, $AF, $FF, $FF, $FF, $FF, $FF
}
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; PrepDynamicTile
; in: A - Loot ID
;-------------------------------------------------------------------------------- 20/8477
PrepDynamicTile:
PHA : PHX : PHY
JSR.w LoadDynamicTileOAMTable
JSL.l GetSpriteID ; convert loot id to sprite id
JSL.l GetAnimatedSpriteTile_variable
PLY : PLX : PLA
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; LoadDynamicTileOAMTable
; in: A - Loot ID
;-------------------------------------------------------------------------------- 20/847B
!SPRITE_OAM = "$7EC025"
;--------------------------------------------------------------------------------
LoadDynamicTileOAMTable:
PHA : PHP
PHA
REP #$20 ; set 16-bit accumulator
LDA.w #$0000 : STA.l !SPRITE_OAM
STA.l !SPRITE_OAM+2
LDA.w #$0200 : STA.l !SPRITE_OAM+6
SEP #$20 ; set 8-bit accumulator
LDA.b #$24 : STA.l !SPRITE_OAM+4
LDA $01,s
JSL.l GetSpritePalette
STA !SPRITE_OAM+5 : STA !SPRITE_OAM+13
PLA
JSL.l IsNarrowSprite : BCS .narrow
BRA .done
.narrow
REP #$20 ; set 16-bit accumulator
LDA.w #$0000 : STA.l !SPRITE_OAM+7
STA.l !SPRITE_OAM+14
LDA.w #$0800 : STA.l !SPRITE_OAM+9
LDA.w #$3400 : STA.l !SPRITE_OAM+11
.done
PLP : PLA
RTS
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; DrawDynamicTile
; in: A - Loot ID
; out: A - OAM Slots Taken
;--------------------------------------------------------------------------------
; This wastes two OAM slots if you don't want a shadow - fix later - I wrote "fix later" over a year ago and it's still not fixed (Aug 6, 2017) - lol (May 25th, 2019)
;-------------------------------------------------------------------------------- 2084B8
!SPRITE_OAM = "$7EC025"
!SKIP_EOR = "$7F5008"
;--------------------------------------------------------------------------------
DrawDynamicTile:
JSL.l IsNarrowSprite : BCS .narrow
.full
LDA.b #$01 : STA $06
LDA #$0C : JSL.l OAM_AllocateFromRegionC
LDA #$02 : PHA
BRA .draw
.narrow
LDA.b #$02 : STA $06
LDA #$10 : JSL.l OAM_AllocateFromRegionC
LDA #$03 : PHA
.draw
LDA.b #!SPRITE_OAM>>0 : STA $08
LDA.b #!SPRITE_OAM>>8 : STA $09
STZ $07
LDA #$7E : PHB : PHA : PLB
LDA.b #$01 : STA.l !SKIP_EOR
JSL Sprite_DrawMultiple_quantity_preset
LDA.b #$00 : STA.l !SKIP_EOR
PLB
LDA $90 : !ADD.b #$08 : STA $90 ; leave the pointer in the right spot to draw the shadow, if desired
LDA $92 : INC #2 : STA $92
PLA
RTL
;--------------------------------------------------------------------------------
DrawDynamicTileNoShadow:
JSL.l IsNarrowSprite : BCS .narrow
.full
LDA.b #$01 : STA $06
LDA #$04 : JSL.l OAM_AllocateFromRegionC
BRA .draw
.narrow
LDA.b #$02 : STA $06
LDA #$08 : JSL.l OAM_AllocateFromRegionC
.draw
LDA.b #!SPRITE_OAM>>0 : STA $08
LDA.b #!SPRITE_OAM>>8 : STA $09
STZ $07
LDA #$7E : PHB : PHA : PLB
LDA.b #$01 : STA.l !SKIP_EOR
JSL Sprite_DrawMultiple_quantity_preset
LDA Bob : BNE + : LDA.b #$00 : STA.l !SKIP_EOR : + ; Bob fix is conditional
PLB
LDA $90 : !ADD.b #$08 : STA $90
LDA $92 : INC #2 : STA $92
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
!TILE_UPLOAD_OFFSET_OVERRIDE = "$7F5042"
LoadModifiedTileBufferAddress:
PHA
LDA !TILE_UPLOAD_OFFSET_OVERRIDE : BEQ +
TAX
LDY.w #$0002
LDA.w #$0000 : STA !TILE_UPLOAD_OFFSET_OVERRIDE
BRA .done
+
LDX.w #$2D40
LDY.w #$0002
.done
PLA
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; Sprite_IsOnscreen
; in: X - Sprite Slot
; out: Carry - 1 = On Screen, 0 = Off Screen
;--------------------------------------------------------------------------------
Sprite_IsOnscreen:
JSR _Sprite_IsOnscreen_DoWork
BCS +
REP #$20
LDA $E2 : PHA : !SUB.w #$0F : STA $E2
LDA $E8 : PHA : !SUB.w #$0F : STA $E8
SEP #$20
JSR _Sprite_IsOnscreen_DoWork
REP #$20
PLA : STA $E8
PLA : STA $E2
SEP #$20
+
RTL
_Sprite_IsOnscreen_DoWork:
LDA $0D10, X : CMP $E2
LDA $0D30, X : SBC $E3 : BNE .offscreen
LDA $0D00, X : CMP $E8
LDA $0D20, X : SBC $E9 : BNE .offscreen
SEC
RTS
.offscreen
CLC
RTS
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; Sprite_GetScreenRelativeCoords:
; out: $00.w Sprite Y
; out: $02.w Sprite X
; out: $06.b Sprite Y Relative
; out: $07.b Sprite X Relative
;--------------------------------------------------------------------------------
; Copied from bank $06
;--------------------------------------------------------------------------------
!spr_y_lo = $00
!spr_y_hi = $01
!spr_x_lo = $02
!spr_x_hi = $03
!spr_y_screen_rel = $06
!spr_x_screen_rel = $07
;--------------------------------------------------------------------------------
Sprite_GetScreenRelativeCoords:
STY $0B
STA $08
LDA $0D00, X : STA $00
!SUB $E8 : STA $06
LDA $0D20, X : STA $01
LDA $0D10, X : STA $02
!SUB $E2 : STA $07
LDA $0D30, X : STA $03
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; SkipDrawEOR - Shims in Bank05.asm : 2499
;--------------------------------------------------------------------------------
!SKIP_EOR = "$7F5008"
;--------------------------------------------------------------------------------
SkipDrawEOR:
LDA.l !SKIP_EOR : BEQ .normal
LDA.w #$0000 : STA.l !SKIP_EOR
LDA $04 : AND.w #$F0FF : STA $04
.normal
LDA ($08), Y : EOR $04 ; thing we wrote over
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; HexToDec
; in: A(w) - Word to Convert
; out: $7F5003 - $7F5007 (high - low)
;--------------------------------------------------------------------------------
HexToDec:
PHA
PHA
LDA.w #$9090
STA $04 : STA $06 ; temporarily store our decimal values here for speed
PLA
; as far as i can tell we never convert a value larger than 9999, no point in wasting time on this?
; -
; CMP.w #10000 : !BLT +
; INC $03
; !SUB.w #10000 : BRA -
; +
-
CMP.w #1000 : !BLT +
INC $04
!SUB.w #1000 : BRA -
+ -
CMP.w #100 : !BLT +
INC $05
!SUB.w #100 : BRA -
+ -
CMP.w #10 : !BLT +
INC $06
!SUB.w #10 : BRA -
+ -
CMP.w #1 : !BLT +
INC $07
!SUB.w #1 : BRA -
+
LDA.b $04 : STA $7F5004 ; move to digit storage
LDA.b $06 : STA $7F5006
PLA
RTL
;--------------------------------------------------------------------------------
; CountBits
; in: A(b) - Byte to count bits in
; out: A(b) - sum of bits
; caller is responsible for setting 8-bit mode and preserving X and Y
;--------------------------------------------------------------------------------
;CountBits:
; PHX
; TAX ; Save a copy of value
; LSR #4 ; Shift down hi nybble, Leave <3> in C
; PHA ; And save <7:4> in Stack
; TXA ; Recover value
; AND.b #$07 ; Put out <2:0> in X
; TAX ; And save in X
; LDA.l NybbleBitCounts, X ; Fetch count for <2:0>
; PLX ; get <7:4>
; ADC.l NybbleBitCounts, X ; Add count for S & C
; PLX
;RTL
; Look up table of bit counts in the values $00-$0F
NybbleBitCounts:
db #00, #01, #01, #02, #01, #02, #02, #03, #01, #02, #02, #03, #02, #03, #03, #04
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; HexToDec
; in: A(w) - Word to Convert
; out: $7F5003 - $7F5007 (high - low)
;--------------------------------------------------------------------------------
;HexToDec:
; PHA
; PHA
; LDA.w #$9090
; STA $7F5003 : STA $7F5005 : STA $7F5006 ; clear digit storage
; PLA
; -
; CMP.w #10000 : !BLT +
; PHA : SEP #$20 : LDA $7F5003 : INC : STA $7F5003 : REP #$20 : PLA
; !SUB.w #10000 : BRA -
; + -
; CMP.w #1000 : !BLT +
; PHA : SEP #$20 : LDA $7F5004 : INC : STA $7F5004 : REP #$20 : PLA
; !SUB.w #1000 : BRA -
; + -
; CMP.w #100 : !BLT +
; PHA : SEP #$20 : LDA $7F5005 : INC : STA $7F5005 : REP #$20 : PLA
; !SUB.w #100 : BRA -
; + -
; CMP.w #10 : !BLT +
; PHA : SEP #$20 : LDA $7F5006 : INC : STA $7F5006 : REP #$20 : PLA
; !SUB.w #10 : BRA -
; + -
; CMP.w #1 : !BLT +
; PHA : SEP #$20 : LDA $7F5007 : INC : STA $7F5007 : REP #$20 : PLA
; !SUB.w #1 : BRA -
; +
; PLA
;RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; WriteVRAMStripe
; in: A(w) - VRAM Destination
; in: X(w) - Length in Tiles
; in: Y(w) - Word to Write
;--------------------------------------------------------------------------------
WriteVRAMStripe:
PHX
LDX $1000 ; get pointer
AND.w #$7F : STA $1002, X : INX #2 ; set destination
PLA : ASL : AND.w #$7FFF : ORA.w #$7000 : STA $1002, X : INX #2 ; set length and enable RLE
TYA : STA $1002, X : INX #2 ; set tile
SEP #$20 ; set 8-bit accumulator
LDA.b #$FF : STA $1002, X
STX $1000
LDA.b #01 : STA $14
REP #$20 ; set 16-bit accumulator
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; WriteVRAMBlock
; in: A(w) - VRAM Destination
; in: X(w) - Length in Tiles
; in: Y(w) - Address of Data to Copy
;--------------------------------------------------------------------------------
WriteVRAMBlock:
PHX
LDX $1000 ; get pointer
AND.w #$7F : STA $1002, X : INX #2 ; set destination
PLA : ASL : AND.w #$3FFF : STA $1002, X : INX #2 ; set length
PHX
TYX ; set X to source
PHA
TXA : !ADD #$1002 : TAY ; set Y to dest
PLA
;A is already the value we need for mvn
MVN $7F7E ; currently we transfer from our buffers in 7F to the vram buffer in 7E
!ADD 1, s ; add the length in A to the stack pointer on the top of the stack
PLX : TAX ; pull and promptly ignore, copying the value we just got over it
SEP #$20 ; set 8-bit accumulator
LDA.b #$FF : STA $1002, X
STX $1000
LDA.b #01 : STA $14
REP #$20 ; set 16-bit accumulator
RTL
;--------------------------------------------------------------------------------
;Byte 1 byte 2 Byte 3 byte 4
;Evvvvvvv vvvvvvv DRllllll llllllll
;
;E if set indicates that this is not a header, but instead is the terminator byte. Only the topmost bit matters in that case.
;The v's form a vram address.
;if D is set, the dma will increment the vram address by a row per word, instead of incrementing by a column (1).
;R if set enables a run length encoding feature
;the l's are the number of bytes to upload minus 1 (don't forget this -1, it is important)
;
;This is then followed by the bytes to upload, in normal format.
;RLE feature:
;This feature makes it easy to draw the same tile repeatedly. If this bit is set, the length bits should be set to 2 times the number of copies of the tile to upload. (Without subtracting 1!)
;It is followed by a single tile (word). Combining this this with the D bit makes it easy to draw large horizontal or vertical runs of a tile without using much space. Geat for erasing or drawing horizontal or verical box edges.
;================================================================================
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