diff options
Diffstat (limited to 'home/uncompress.asm')
| -rw-r--r-- | home/uncompress.asm | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/home/uncompress.asm b/home/uncompress.asm index 0e609f1c..9e434497 100644 --- a/home/uncompress.asm +++ b/home/uncompress.asm @@ -1,3 +1,8 @@ +; wSpriteLoadFlags bits, streamed from compressed sprite data + const_def + const BIT_USE_SPRITE_BUFFER_2 ; 0 + const BIT_LAST_SPRITE_CHUNK ; 1 + ; bankswitches and runs _UncompressSpriteData ; bank is given in a, sprite input stream is pointed to in wSpriteInputPtr UncompressSpriteData:: @@ -47,7 +52,7 @@ _UncompressSpriteData:: add a ld [wSpriteWidth], a call ReadNextInputBit - ld [wSpriteLoadFlags], a ; initialite bit1 to 0 and bit0 to the first input bit + ld [wSpriteLoadFlags], a ; initialize bit1 to 0 and bit0 to the first input bit ; this will load two chunks of data to sSpriteBuffer1 and sSpriteBuffer2 ; bit 0 decides in which one the first chunk is placed ; fall through @@ -58,13 +63,13 @@ _UncompressSpriteData:: UncompressSpriteDataLoop:: ld hl, sSpriteBuffer1 ld a, [wSpriteLoadFlags] - bit 0, a + bit BIT_USE_SPRITE_BUFFER_2, a jr z, .useSpriteBuffer1 ; check which buffer to use ld hl, sSpriteBuffer2 .useSpriteBuffer1 call StoreSpriteOutputPointer ld a, [wSpriteLoadFlags] - bit 1, a + bit BIT_LAST_SPRITE_CHUNK, a jr z, .startDecompression ; check if last iteration call ReadNextInputBit ; if last chunk, read 1-2 bit unpacking mode and a @@ -196,10 +201,10 @@ MoveToNextBufferPosition:: xor a ld [wSpriteCurPosX], a ld a, [wSpriteLoadFlags] - bit 1, a + bit BIT_LAST_SPRITE_CHUNK, a jr nz, .done ; test if there is one more sprite to go - xor $1 - set 1, a + xor 1 << BIT_USE_SPRITE_BUFFER_2 + set BIT_LAST_SPRITE_CHUNK, a ld [wSpriteLoadFlags], a jp UncompressSpriteDataLoop .done @@ -540,7 +545,7 @@ ReverseNybble:: ; resets sprite buffer pointers to buffer 1 and 2, depending on wSpriteLoadFlags ResetSpriteBufferPointers:: ld a, [wSpriteLoadFlags] - bit 0, a + bit BIT_USE_SPRITE_BUFFER_2, a jr nz, .buffer2Selected ld de, sSpriteBuffer1 ld hl, sSpriteBuffer2 |