diff options
Diffstat (limited to 'home/tilemap.asm')
| -rw-r--r-- | home/tilemap.asm | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/home/tilemap.asm b/home/tilemap.asm new file mode 100644 index 00000000..afee7097 --- /dev/null +++ b/home/tilemap.asm @@ -0,0 +1,61 @@ +FillMemory:: +; Fill bc bytes at hl with a. + push de + ld d, a +.loop + ld a, d + ld [hli], a + dec bc + ld a, b + or c + jr nz, .loop + pop de + ret + +UncompressSpriteFromDE:: +; Decompress pic at a:de. + ld hl, wSpriteInputPtr + ld [hl], e + inc hl + ld [hl], d + jp UncompressSpriteData + +SaveScreenTilesToBuffer2:: + hlcoord 0, 0 + ld de, wTileMapBackup2 + ld bc, SCREEN_WIDTH * SCREEN_HEIGHT + call CopyData + ret + +LoadScreenTilesFromBuffer2:: + call LoadScreenTilesFromBuffer2DisableBGTransfer + ld a, 1 + ldh [hAutoBGTransferEnabled], a + ret + +; loads screen tiles stored in wTileMapBackup2 but leaves hAutoBGTransferEnabled disabled +LoadScreenTilesFromBuffer2DisableBGTransfer:: + xor a + ldh [hAutoBGTransferEnabled], a + ld hl, wTileMapBackup2 + decoord 0, 0 + ld bc, SCREEN_WIDTH * SCREEN_HEIGHT + call CopyData + ret + +SaveScreenTilesToBuffer1:: + hlcoord 0, 0 + ld de, wTileMapBackup + ld bc, SCREEN_WIDTH * SCREEN_HEIGHT + jp CopyData + +LoadScreenTilesFromBuffer1:: + xor a + ldh [hAutoBGTransferEnabled], a + ld hl, wTileMapBackup + decoord 0, 0 + ld bc, SCREEN_WIDTH * SCREEN_HEIGHT + call CopyData + ld a, 1 + ldh [hAutoBGTransferEnabled], a + ret |