diff options
Diffstat (limited to 'engine/overworld/map_sprites.asm')
| -rwxr-xr-x | engine/overworld/map_sprites.asm | 74 |
1 files changed, 39 insertions, 35 deletions
diff --git a/engine/overworld/map_sprites.asm b/engine/overworld/map_sprites.asm index 0de1befd..8f1f3931 100755 --- a/engine/overworld/map_sprites.asm +++ b/engine/overworld/map_sprites.asm @@ -4,20 +4,21 @@ ; This is also called after displaying text because loading ; text tile patterns overwrites half of the sprite tile pattern data. ; Note on notation: -; $C1X* and $C2X* are used to denote wSpriteStateData1-wSpriteStateData1 + $ff and wSpriteStateData2 + $00-wSpriteStateData2 + $ff sprite slot -; fields, respectively, within loops. The X is the loop index. -; If there is an inner loop, Y is the inner loop index, i.e. $C1Y* and $C2Y* -; denote fields of the sprite slots iterated over in the inner loop. +; x#SPRITESTATEDATA1_* and x#SPRITESTATEDATA2_* are used to denote wSpriteStateData1 and +; wSpriteStateData2 sprite slot, respectively, within loops. The X is the loop index. +; If there is an inner loop, Y is the inner loop index, i.e. y#SPRITESTATEDATA1_* and +; y#SPRITESTATEDATA2_* denote fields of the sprite slots iterated over in the inner loop. InitMapSprites:: call InitOutsideMapSprites ret c ; return if the map is an outside map (already handled by above call) ; if the map is an inside map (i.e. mapID >= $25) ld hl, wSpritePlayerStateData1PictureID ld de, wSpritePlayerStateData2PictureID -; Loop to copy picture ID's from $C1X0 to $C2XD for LoadMapSpriteTilePatterns. +; Loop to copy picture IDs from [x#SPRITESTATEDATA1_PICTUREID] +; to [x#SPRITESTATEDATA2_PICTUREID] for LoadMapSpriteTilePatterns. .copyPictureIDLoop - ld a, [hl] ; $C1X0 (picture ID) - ld [de], a ; $C2XD + ld a, [hl] ; a = [x#SPRITESTATEDATA1_PICTUREID] + ld [de], a ; [x#SPRITESTATEDATA2_PICTUREID] = a ld a, $10 add e ld e, a @@ -39,10 +40,12 @@ LoadMapSpriteTilePatterns: ld b, $10 ; number of sprite slots ld hl, wSpritePlayerStateData2PictureID xor a - ld [hFourTileSpriteCount], a -.copyPictureIDLoop ; loop to copy picture ID from $C2XD to $C2XE - ld a, [hli] ; $C2XD (sprite picture ID) - ld [hld], a ; $C2XE + ldh [hFourTileSpriteCount], a +; Loop to copy picture IDs from [x#SPRITESTATEDATA2_PICTUREID] +; to [x#SPRITESTATEDATA2_IMAGEBASEOFFSET]. +.copyPictureIDLoop + ld a, [hli] ; a = [x#SPRITESTATEDATA2_PICTUREID] + ld [hld], a ; [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] = a ld a, l add $10 ld l, a @@ -81,7 +84,7 @@ LoadMapSpriteTilePatterns: ld a, l cp e ; reached current slot? jr z, .foundNextVRAMSlot - ld a, [de] ; $C2YE (VRAM slot) + ld a, [de] ; y#SPRITESTATEDATA2_IMAGEBASEOFFSET cp 11 ; is it one of the first 10 slots? jr nc, .findNextVRAMSlotLoop cp b ; compare the slot being checked to the current max @@ -93,19 +96,19 @@ LoadMapSpriteTilePatterns: inc b ; increment previous max value to get next VRAM tile pattern slot ld a, b ; a = next VRAM tile pattern slot push af - ld a, [hl] ; $C2XE (sprite picture ID) + ld a, [hl] ; [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] ld b, a ; b = current sprite picture ID cp SPRITE_BALL ; is it a 4-tile sprite? jr c, .notFourTileSprite pop af - ld a, [hFourTileSpriteCount] + ldh a, [hFourTileSpriteCount] add 11 jr .storeVRAMSlot .notFourTileSprite pop af .storeVRAMSlot - ld [hl], a ; store VRAM slot at $C2XE - ld [hVRAMSlot], a ; used to determine if it's 4-tile sprite later + ld [hl], a ; store VRAM slot at [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] + ldh [hVRAMSlot], a ; used to determine if it's 4-tile sprite later ld a, b ; a = current sprite picture ID dec a add a @@ -127,27 +130,27 @@ LoadMapSpriteTilePatterns: push de push bc ld hl, vNPCSprites ; VRAM base address - ld bc, $c0 ; number of bytes per VRAM slot - ld a, [hVRAMSlot] + ld bc, 12 tiles ; number of bytes per VRAM slot + ldh a, [hVRAMSlot] cp 11 ; is it a 4-tile sprite? jr nc, .fourTileSpriteVRAMAddr ld d, a dec d -; hl = vSprites + [hVRAMSlot] * $C0 (the number of bytes in 12 tiles) +; hl = vSprites + [hVRAMSlot] * 12 tiles .calculateVRAMAddrLoop add hl, bc dec d jr nz, .calculateVRAMAddrLoop jr .loadStillTilePattern .fourTileSpriteVRAMAddr - ld hl, vSprites + $7c0 ; address for second 4-tile sprite - ld a, [hFourTileSpriteCount] + ld hl, vSprites tile $7c ; address for second 4-tile sprite + ldh a, [hFourTileSpriteCount] and a jr nz, .loadStillTilePattern ; if it's the first 4-tile sprite - ld hl, vSprites + $780 ; address for first 4-tile sprite + ld hl, vSprites tile $78 ; address for first 4-tile sprite inc a - ld [hFourTileSpriteCount], a + ldh [hFourTileSpriteCount], a .loadStillTilePattern pop bc pop de @@ -167,7 +170,7 @@ LoadMapSpriteTilePatterns: .skipFirstLoad pop de pop hl - ld a, [hVRAMSlot] + ldh a, [hVRAMSlot] cp 11 ; is it a 4-tile sprite? jr nc, .skipSecondLoad ; if so, there is no second block push de @@ -207,8 +210,8 @@ LoadMapSpriteTilePatterns: jr .nextSpriteSlot .alreadyLoaded ; if the current picture ID has already had its tile patterns loaded inc de - ld a, [de] ; a = VRAM slot for the current picture ID (from $C2YE) - ld [hl], a ; store VRAM slot in current wSpriteStateData2 sprite slot (at $C2XE) + ld a, [de] ; a = [y#SPRITESTATEDATA2_IMAGEBASEOFFSET] + ld [hl], a ; [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] = a .nextSpriteSlot ld a, l add $10 @@ -217,10 +220,11 @@ LoadMapSpriteTilePatterns: jp nz, .loadTilePatternLoop ld hl, wSpritePlayerStateData2PictureID ld b, $10 -; the pictures ID's stored at $C2XD are no longer needed, so zero them +; the pictures IDs stored at [x#SPRITESTATEDATA2_PICTUREID] are no longer needed, +; so zero them .zeroStoredPictureIDLoop xor a - ld [hl], a ; $C2XD + ld [hl], a ; [x#SPRITESTATEDATA2_PICTUREID] ld a, $10 add l ld l, a @@ -292,15 +296,15 @@ InitOutsideMapSprites: ld [hl], a ld bc, wSpriteSet ; Load the sprite set into RAM. -; This loop also fills $C2XD (sprite picture ID) where X is from $0 to $A -; with picture ID's. This is done so that LoadMapSpriteTilePatterns will +; This loop also fills [x#SPRITESTATEDATA2_PICTUREID] where X is from $0 to $A +; with picture IDs. This is done so that LoadMapSpriteTilePatterns will ; load tile patterns for all sprite pictures in the sprite set. .loadSpriteSetLoop ld a, $10 add l ld l, a ld a, [de] ; sprite picture ID from sprite set - ld [hl], a ; $C2XD (sprite picture ID) + ld [hl], a ; [x#SPRITESTATEDATA2_PICTUREID] ld [bc], a inc de inc bc @@ -313,7 +317,7 @@ InitOutsideMapSprites: add l ld l, a xor a - ld [hl], a ; $C2XD (sprite picture ID) + ld [hl], a ; [x#SPRITESTATEDATA2_PICTUREID] dec b jr nz, .zeroRemainingSlotsLoop ld a, [wNumSprites] @@ -330,7 +334,7 @@ InitOutsideMapSprites: ; for the current map. So, they are not needed and are zeroed by this loop. .zeroVRAMSlotsLoop xor a - ld [hl], a ; $C2XE (VRAM slot) + ld [hl], a ; [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] ld a, $10 add l ld l, a @@ -347,7 +351,7 @@ InitOutsideMapSprites: ; VRAM tile pattern slot. .storeVRAMSlotsLoop ld c, 0 - ld a, [hl] ; $C1X0 (picture ID) (zero if sprite slot is not used) + ld a, [hl] ; [x#SPRITESTATEDATA1_PICTUREID] (zero if sprite slot is not used) and a ; is the sprite slot used? jr z, .skipGettingPictureIndex ; if the sprite slot is not used ld b, a ; b = picture ID @@ -367,7 +371,7 @@ InitOutsideMapSprites: add l ld l, a ld a, c ; a = VRAM slot (zero if sprite slot is not used) - ld [hl], a ; $C2XE (VRAM slot) + ld [hl], a ; [x#SPRITESTATEDATA2_IMAGEBASEOFFSET] pop hl ld a, $10 add l |