diff options
Diffstat (limited to 'home/pic.asm')
| -rw-r--r-- | home/pic.asm | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/home/pic.asm b/home/pic.asm index 96c013b..b883093 100644 --- a/home/pic.asm +++ b/home/pic.asm @@ -2,7 +2,7 @@ INCLUDE "constants.asm" SECTION "home/pic.asm", ROM0 -UncompressSpriteData:: ; 95e (0:95e) +UncompressSpriteData:: ; bankswitches and runs _UncompressSpriteData ; bank is given in a, sprite input stream is pointed to in wSpriteInputPtr ld b, a @@ -18,7 +18,7 @@ UncompressSpriteData:: ; 95e (0:95e) call Bankswitch ret -_UncompressSpriteData:: ; 976 (0:976) +_UncompressSpriteData:: ; initializes necessary data to load a sprite and runs UncompressSpriteDataLoop ld hl, sSpriteBuffer1 ld c, (2 * SPRITEBUFFERSIZE) % $100 @@ -144,7 +144,7 @@ UncompressSpriteDataLoop:: jr nz, .writeZerosLoop jr .readNextInput -MoveToNextBufferPosition:: ; a34 (0:a34) +MoveToNextBufferPosition:: ; moves output pointer to next position ; also cancels the calling function if the all output is done (by removing the return pointer from stack) ; and calls postprocessing functions according to the unpack mode @@ -207,7 +207,7 @@ MoveToNextBufferPosition:: ; a34 (0:a34) .done jp UnpackSprite -WriteSpriteBitsToBuffer:: ; aa5 (0:aa5) +WriteSpriteBitsToBuffer:: ; writes 2 bits (from a) to the output buffer (pointed to from wSpriteOutputPtr) ld e, a ld a, [wSpriteOutputBitOffset] @@ -235,7 +235,7 @@ WriteSpriteBitsToBuffer:: ; aa5 (0:aa5) ld [hl], a ret -ReadNextInputBit:: ; acc (0:acc) +ReadNextInputBit:: ; reads next bit from input stream and returns it in a ld a, [wSpriteInputBitCounter] dec a @@ -251,7 +251,7 @@ ReadNextInputBit:: ; acc (0:acc) and $01 ret -ReadNextInputByte: ; ae7 (0:ae7) +ReadNextInputByte: ; reads next byte from input stream and returns it in a ld a, [wSpriteInputPtr] ld l, a @@ -285,7 +285,7 @@ LengthEncodingOffsetList:: dw %0111111111111111 dw %1111111111111111 -UnpackSprite:: ; b1b (0:b1b) +UnpackSprite:: ; unpacks the sprite data depending on the unpack mode ld a, [wSpriteUnpackMode] cp $02 @@ -383,7 +383,7 @@ SpriteDifferentialDecode:: ld [wSpriteCurPosY], a ret -DifferentialDecodeNybble:: ; bc9 (0:bc9) +DifferentialDecodeNybble:: ; decodes the nybble stored in a. Last decoded data is assumed to be in e (needed to determine if initial value is 0 or 1) srl a ; c=a%2, a/=2 ld c, $00 @@ -463,7 +463,7 @@ DecodeNybble1TableFlipped:: dn $e, $6 dn $2, $a -XorSpriteChunks:: ; c23 (0:c23) +XorSpriteChunks:: ; combines the two loaded chunks with xor (the chunk loaded second is the destination). The source chunk is differentially decoded beforehand. xor a ld [wSpriteCurPosX], a @@ -528,7 +528,7 @@ XorSpriteChunks:: ; c23 (0:c23) ld [wSpriteCurPosX], a ret -ReverseNybble:: ; c93 (0:c93) +ReverseNybble:: ; reverses the bits in the nybble given in register a ld de, NybbleReverseTable add e @@ -539,7 +539,7 @@ ReverseNybble:: ; c93 (0:c93) ld a, [de] ret -ResetSpriteBufferPointers:: ; c9d (0:c9d) +ResetSpriteBufferPointers:: ; resets sprite buffer pointers to buffer 1 and 2, depending on wSpriteLoadFlags ld a, [wSpriteLoadFlags] bit 0, a @@ -565,7 +565,7 @@ ResetSpriteBufferPointers:: ; c9d (0:c9d) NybbleReverseTable:: db $0, $8, $4, $c, $2, $a, $6 ,$e, $1, $9, $5, $d, $3, $b, $7 ,$f -UnpackSpriteMode2:: ; cd3 (0:cd3) +UnpackSpriteMode2:: ; combines the two loaded chunks with xor (the chunk loaded second is the destination). Both chunks are differentially decoded beforehand. call ResetSpriteBufferPointers ld a, [wSpriteFlipped] @@ -582,7 +582,7 @@ UnpackSpriteMode2:: ; cd3 (0:cd3) ld [wSpriteFlipped], a jp XorSpriteChunks -StoreSpriteOutputPointer:: ; cf3 (0:cf3) +StoreSpriteOutputPointer:: ; stores hl into the output pointers ld a, l ld [wSpriteOutputPtr], a |