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https://github.com/pret/pokered.git
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440 lines
11 KiB
NASM
Executable file
440 lines
11 KiB
NASM
Executable file
; Loads tile patterns for map's sprites.
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; For outside maps, it loads one of several fixed sets of sprites.
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; For inside maps, it loads each sprite picture ID used in the map header.
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; This is also called after displaying text because loading
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; text tile patterns overwrites half of the sprite tile pattern data.
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; Note on notation:
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; $C1X* and $C2X* are used to denote wSpriteStateData1-wSpriteStateData1 + $ff and wSpriteStateData2 + $00-wSpriteStateData2 + $ff sprite slot
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; fields, respectively, within loops. The X is the loop index.
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; If there is an inner loop, Y is the inner loop index, i.e. $C1Y* and $C2Y*
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; denote fields of the sprite slots interated over in the inner loop.
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InitMapSprites:
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call InitOutsideMapSprites
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ret c ; return if the map is an outside map (already handled by above call)
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; if the map is an inside map (i.e. mapID >= $25)
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ld hl,wSpriteStateData1
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ld de,wSpriteStateData2 + $0d
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; Loop to copy picture ID's from $C1X0 to $C2XD for LoadMapSpriteTilePatterns.
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.copyPictureIDLoop
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ld a,[hl] ; $C1X0 (picture ID)
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ld [de],a ; $C2XD
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ld a,$10
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add e
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ld e,a
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ld a,$10
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add l
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ld l,a
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jr nz,.copyPictureIDLoop
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; This is used for both inside and outside maps, since it is called by
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; InitOutsideMapSprites.
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; Loads tile pattern data for sprites into VRAM.
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LoadMapSpriteTilePatterns:
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ld a,[wNumSprites]
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and a ; are there any sprites?
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jr nz,.spritesExist
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ret
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.spritesExist
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ld c,a ; c = [wNumSprites]
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ld b,$10 ; number of sprite slots
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ld hl,wSpriteStateData2 + $0d
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xor a
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ld [hFourTileSpriteCount],a
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.copyPictureIDLoop ; loop to copy picture ID from $C2XD to $C2XE
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ld a,[hli] ; $C2XD (sprite picture ID)
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ld [hld],a ; $C2XE
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ld a,l
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add a,$10
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ld l,a
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dec b
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jr nz,.copyPictureIDLoop
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ld hl,wSpriteStateData2 + $1e
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.loadTilePatternLoop
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ld de,wSpriteStateData2 + $1d
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; Check if the current picture ID has already had its tile patterns loaded.
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; This done by looping through the previous sprite slots and seeing if any of
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; their picture ID's match that of the current sprite slot.
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.checkIfAlreadyLoadedLoop
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ld a,e
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and a,$f0
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ld b,a ; b = offset of the wSpriteStateData2 sprite slot being checked against
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ld a,l
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and a,$f0 ; a = offset of current wSpriteStateData2 sprite slot
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cp b ; done checking all previous sprite slots?
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jr z,.notAlreadyLoaded
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ld a,[de] ; picture ID of the wSpriteStateData2 sprite slot being checked against
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cp [hl] ; do the picture ID's match?
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jp z,.alreadyLoaded
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ld a,e
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add a,$10
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ld e,a
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jr .checkIfAlreadyLoadedLoop
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.notAlreadyLoaded
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ld de,wSpriteStateData2 + $0e
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ld b,$01
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; loop to find the highest tile pattern VRAM slot (among the first 10 slots) used by a previous sprite slot
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; this is done in order to find the first free VRAM slot available
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.findNextVRAMSlotLoop
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ld a,e
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add a,$10
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ld e,a
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ld a,l
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cp e ; reached current slot?
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jr z,.foundNextVRAMSlot
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ld a,[de] ; $C2YE (VRAM slot)
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cp a,11 ; is it one of the first 10 slots?
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jr nc,.findNextVRAMSlotLoop
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cp b ; compare the slot being checked to the current max
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jr c,.findNextVRAMSlotLoop ; if the slot being checked is less than the current max
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; if the slot being checked is greater than or equal to the current max
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ld b,a ; store new max VRAM slot
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jr .findNextVRAMSlotLoop
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.foundNextVRAMSlot
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inc b ; increment previous max value to get next VRAM tile pattern slot
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ld a,b ; a = next VRAM tile pattern slot
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push af
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ld a,[hl] ; $C2XE (sprite picture ID)
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ld b,a ; b = current sprite picture ID
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cp a,SPRITE_BALL ; is it a 4-tile sprite?
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jr c,.notFourTileSprite
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pop af
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ld a,[hFourTileSpriteCount]
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add a,11
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jr .storeVRAMSlot
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.notFourTileSprite
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pop af
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.storeVRAMSlot
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ld [hl],a ; store VRAM slot at $C2XE
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ld [hVRAMSlot],a ; used to determine if it's 4-tile sprite later
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ld a,b ; a = current sprite picture ID
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dec a
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add a
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add a
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push bc
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push hl
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ld hl,SpriteSheetPointerTable
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jr nc,.noCarry
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inc h
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.noCarry
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add l
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ld l,a
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jr nc,.noCarry2
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inc h
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.noCarry2
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push hl
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call ReadSpriteSheetData
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push af
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push de
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push bc
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ld hl,vNPCSprites ; VRAM base address
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ld bc,$c0 ; number of bytes per VRAM slot
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ld a,[hVRAMSlot]
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cp a,11 ; is it a 4-tile sprite?
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jr nc,.fourTileSpriteVRAMAddr
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ld d,a
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dec d
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; Equivalent to multiplying $C0 (number of bytes in 12 tiles) times the VRAM
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; slot and adding the result to $8000 (the VRAM base address).
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.calculateVRAMAddrLoop
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add hl,bc
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dec d
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jr nz,.calculateVRAMAddrLoop
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jr .loadStillTilePattern
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.fourTileSpriteVRAMAddr
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ld hl,vSprites + $7c0 ; address for second 4-tile sprite
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ld a,[hFourTileSpriteCount]
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and a
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jr nz,.loadStillTilePattern
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; if it's the first 4-tile sprite
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ld hl,vSprites + $780 ; address for first 4-tile sprite
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inc a
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ld [hFourTileSpriteCount],a
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.loadStillTilePattern
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pop bc
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pop de
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pop af
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push hl
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push hl
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ld h,d
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ld l,e
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pop de
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ld b,a
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ld a,[wFontLoaded]
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bit 0,a ; reloading upper half of tile patterns after displaying text?
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jr nz,.skipFirstLoad ; if so, skip loading data into the lower half
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ld a,b
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ld b,0
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call FarCopyData2 ; load tile pattern data for sprite when standing still
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.skipFirstLoad
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pop de
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pop hl
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ld a,[hVRAMSlot]
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cp a,11 ; is it a 4-tile sprite?
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jr nc,.skipSecondLoad ; if so, there is no second block
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push de
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call ReadSpriteSheetData
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push af
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ld a,$c0
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add e
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ld e,a
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jr nc,.noCarry3
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inc d
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.noCarry3
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ld a,[wFontLoaded]
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bit 0,a ; reloading upper half of tile patterns after displaying text?
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jr nz,.loadWhileLCDOn
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pop af
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pop hl
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set 3,h ; add $800 to hl
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push hl
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ld h,d
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ld l,e
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pop de
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call FarCopyData2 ; load tile pattern data for sprite when walking
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jr .skipSecondLoad
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; When reloading the upper half of tile patterns after diplaying text, the LCD
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; will be on, so CopyVideoData (which writes to VRAM only during V-blank) must
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; be used instead of FarCopyData2.
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.loadWhileLCDOn
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pop af
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pop hl
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set 3,h ; add $800 to hl
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ld b,a
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swap c
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call CopyVideoData ; load tile pattern data for sprite when walking
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.skipSecondLoad
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pop hl
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pop bc
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jr .nextSpriteSlot
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.alreadyLoaded ; if the current picture ID has already had its tile patterns loaded
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inc de
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ld a,[de] ; a = VRAM slot for the current picture ID (from $C2YE)
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ld [hl],a ; store VRAM slot in current wSpriteStateData2 sprite slot (at $C2XE)
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.nextSpriteSlot
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ld a,l
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add a,$10
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ld l,a
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dec c
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jp nz,.loadTilePatternLoop
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ld hl,wSpriteStateData2 + $0d
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ld b,$10
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; the pictures ID's stored at $C2XD are no longer needed, so zero them
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.zeroStoredPictureIDLoop
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xor a
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ld [hl],a ; $C2XD
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ld a,$10
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add l
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ld l,a
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dec b
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jr nz,.zeroStoredPictureIDLoop
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ret
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; reads data from SpriteSheetPointerTable
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; INPUT:
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; hl = address of sprite sheet entry
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; OUTPUT:
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; de = pointer to sprite sheet
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; bc = length in bytes
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; a = ROM bank
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ReadSpriteSheetData:
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ld a,[hli]
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ld e,a
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ld a,[hli]
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ld d,a
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ld a,[hli]
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ld c,a
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xor a
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ld b,a
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ld a,[hli]
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ret
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; Loads sprite set for outside maps (cities and routes) and sets VRAM slots.
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; sets carry if the map is a city or route, unsets carry if not
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InitOutsideMapSprites:
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ld a,[wCurMap]
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cp a,REDS_HOUSE_1F ; is the map a city or a route (map ID less than $25)?
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ret nc ; if not, return
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ld hl,MapSpriteSets
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add l
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ld l,a
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jr nc,.noCarry
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inc h
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.noCarry
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ld a,[hl] ; a = spriteSetID
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cp a,$f0 ; does the map have 2 sprite sets?
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call nc,GetSplitMapSpriteSetID ; if so, choose the appropriate one
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ld b,a ; b = spriteSetID
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ld a,[wFontLoaded]
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bit 0,a ; reloading upper half of tile patterns after displaying text?
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jr nz,.loadSpriteSet ; if so, forcibly reload the sprite set
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ld a,[wSpriteSetID]
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cp b ; has the sprite set ID changed?
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jr z,.skipLoadingSpriteSet ; if not, don't load it again
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.loadSpriteSet
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ld a,b
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ld [wSpriteSetID],a
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dec a
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ld b,a
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sla a
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ld c,a
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sla a
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sla a
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add c
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add b ; a = (spriteSetID - 1) * 11
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ld de,SpriteSets
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; add a to de to get offset of sprite set
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add e
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ld e,a
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jr nc,.noCarry2
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inc d
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.noCarry2
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ld hl,wSpriteStateData2 + $0d
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ld a,SPRITE_RED
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ld [hl],a
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ld bc,wSpriteSet
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; Load the sprite set into RAM.
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; This loop also fills $C2XD (sprite picture ID) where X is from $0 to $A
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; with picture ID's. This is done so that LoadMapSpriteTilePatterns will
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; load tile patterns for all sprite pictures in the sprite set.
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.loadSpriteSetLoop
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ld a,$10
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add l
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ld l,a
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ld a,[de] ; sprite picture ID from sprite set
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ld [hl],a ; $C2XD (sprite picture ID)
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ld [bc],a
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inc de
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inc bc
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ld a,l
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cp a,$bd ; reached 11th sprite slot?
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jr nz,.loadSpriteSetLoop
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ld b,4 ; 4 remaining sprite slots
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.zeroRemainingSlotsLoop ; loop to zero the picture ID's of the remaining sprite slots
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ld a,$10
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add l
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ld l,a
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xor a
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ld [hl],a ; $C2XD (sprite picture ID)
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dec b
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jr nz,.zeroRemainingSlotsLoop
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ld a,[wNumSprites]
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push af ; save number of sprites
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ld a,11 ; 11 sprites in sprite set
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ld [wNumSprites],a
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call LoadMapSpriteTilePatterns
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pop af
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ld [wNumSprites],a ; restore number of sprites
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ld hl,wSpriteStateData2 + $1e
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ld b,$0f
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; The VRAM tile pattern slots that LoadMapSpriteTilePatterns set are in the
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; order of the map's sprite set, not the order of the actual sprites loaded
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; for the current map. So, they are not needed and are zeroed by this loop.
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.zeroVRAMSlotsLoop
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xor a
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ld [hl],a ; $C2XE (VRAM slot)
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ld a,$10
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add l
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ld l,a
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dec b
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jr nz,.zeroVRAMSlotsLoop
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.skipLoadingSpriteSet
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ld hl,wSpriteStateData1 + $10
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; This loop stores the correct VRAM tile pattern slots according the sprite
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; data from the map's header. Since the VRAM tile pattern slots are filled in
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; the order of the sprite set, in order to find the VRAM tile pattern slot
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; for a sprite slot, the picture ID for the sprite is looked up within the
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; sprite set. The index of the picture ID within the sprite set plus one
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; (since the Red sprite always has the first VRAM tile pattern slot) is the
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; VRAM tile pattern slot.
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.storeVRAMSlotsLoop
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ld c,0
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ld a,[hl] ; $C1X0 (picture ID) (zero if sprite slot is not used)
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and a ; is the sprite slot used?
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jr z,.skipGettingPictureIndex ; if the sprite slot is not used
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ld b,a ; b = picture ID
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ld de,wSpriteSet
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; Loop to find the index of the sprite's picture ID within the sprite set.
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.getPictureIndexLoop
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inc c
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ld a,[de]
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inc de
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cp b ; does the picture ID match?
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jr nz,.getPictureIndexLoop
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inc c
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.skipGettingPictureIndex
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push hl
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inc h
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ld a,$0e
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add l
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ld l,a
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ld a,c ; a = VRAM slot (zero if sprite slot is not used)
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ld [hl],a ; $C2XE (VRAM slot)
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pop hl
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ld a,$10
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add l
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ld l,a
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and a
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jr nz,.storeVRAMSlotsLoop
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scf
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ret
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; Chooses the correct sprite set ID depending on the player's position within
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; the map for maps with two sprite sets.
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GetSplitMapSpriteSetID:
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cp a,$f8
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jr z,.route20
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ld hl,SplitMapSpriteSets
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and a,$0f
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dec a
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sla a
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sla a
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add l
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ld l,a
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jr nc,.noCarry
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inc h
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.noCarry
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ld a,[hli] ; determines whether the map is split East/West or North/South
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cp a,$01
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ld a,[hli] ; position of dividing line
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ld b,a
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jr z,.eastWestDivide
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.northSouthDivide
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ld a,[wYCoord]
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jr .compareCoord
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.eastWestDivide
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ld a,[wXCoord]
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.compareCoord
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cp b
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jr c,.loadSpriteSetID
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; if in the East side or South side
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inc hl
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.loadSpriteSetID
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ld a,[hl]
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ret
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; Uses sprite set $01 for West side and $0A for East side.
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; Route 20 is a special case because the two map sections have a more complex
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; shape instead of the map simply being split horizontally or vertically.
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.route20
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ld hl,wXCoord
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ld a,[hl]
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cp a,$2b
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ld a,$01
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ret c
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ld a,[hl]
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cp a,$3e
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ld a,$0a
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ret nc
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ld a,[hl]
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cp a,$37
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ld b,$08
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jr nc,.next
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ld b,$0d
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.next
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ld a,[wYCoord]
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cp b
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ld a,$0a
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ret c
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ld a,$01
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ret
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INCLUDE "data/sprite_sets.asm"
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