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| author | dannye <33dannye@gmail.com> | 2024-09-25 00:45:00 -0500 |
|---|---|---|
| committer | dannye <33dannye@gmail.com> | 2024-09-25 00:45:00 -0500 |
| commit | a02a98ee7ada1a658e28698484058be2796dc0df (patch) | |
| tree | 945986054565bd8b5212fc755415096050d1d3a8 /home/uncompress.asm | |
| parent | Use long option flags for rgbgfx, same as tools/gfx (diff) | |
| parent | Use `const_skip` (diff) | |
| download | pokeyellow-a02a98ee7ada1a658e28698484058be2796dc0df.tar.gz pokeyellow-a02a98ee7ada1a658e28698484058be2796dc0df.tar.xz pokeyellow-a02a98ee7ada1a658e28698484058be2796dc0df.zip | |
Merge branch 'master' of https://github.com/pret/pokered
Diffstat (limited to 'home/uncompress.asm')
| -rw-r--r-- | home/uncompress.asm | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/home/uncompress.asm b/home/uncompress.asm index 87264888..19d87f94 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:: @@ -44,24 +49,24 @@ _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 -; uncompresses a chunk from the sprite input data stream (pointed to at wd0da) into sSpriteBuffer1 or sSpriteBuffer2 +; uncompresses a chunk from the sprite input data stream (pointed to by wSpriteInputPtr) into sSpriteBuffer1 or sSpriteBuffer2 ; each chunk is a 1bpp sprite. A 2bpp sprite consist of two chunks which are merged afterwards ; note that this is an endless loop which is terminated during a call to MoveToNextBufferPosition by manipulating the stack 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 @@ -193,10 +198,10 @@ 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 @@ -537,7 +542,7 @@ 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 |