diff options
Diffstat (limited to 'home/video.asm')
| -rw-r--r-- | home/video.asm | 47 |
1 files changed, 9 insertions, 38 deletions
diff --git a/home/video.asm b/home/video.asm index 1066197ff..4b519fca0 100644 --- a/home/video.asm +++ b/home/video.asm @@ -1,6 +1,6 @@ ; Functions dealing with VRAM. -DMATransfer:: ; 15d8 +DMATransfer:: ; Return carry if the transfer is completed. ld a, [hDMATransfer] @@ -16,10 +16,8 @@ DMATransfer:: ; 15d8 ld [hDMATransfer], a scf ret -; 15e3 - -UpdateBGMapBuffer:: ; 15e3 +UpdateBGMapBuffer:: ; Copy [hBGMapTileCount] 16x8 tiles from wBGMapBuffer ; to bg map addresses in wBGMapBufferPtrs. @@ -43,7 +41,6 @@ UpdateBGMapBuffer:: ; 15e3 ld hl, wBGMapPalBuffer ld de, wBGMapBuffer - .next ; Copy a pair of 16x8 blocks (one 16x16 block) @@ -83,7 +80,6 @@ endr jr nz, .next - ld a, [hSPBuffer] ld l, a ld a, [hSPBuffer + 1] @@ -97,10 +93,8 @@ endr ld [hBGMapUpdate], a scf ret -; 163a - -WaitTop:: ; 163a +WaitTop:: ; Wait until the top third of the BG Map is being updated. ld a, [hBGMapMode] @@ -118,10 +112,8 @@ WaitTop:: ; 163a xor a ld [hBGMapMode], a ret -; 164c - -UpdateBGMap:: ; 164c +UpdateBGMap:: ; Update the BG Map, in thirds, from wTileMap and wAttrMap. ld a, [hBGMapMode] @@ -163,7 +155,6 @@ UpdateBGMap:: ; 164c ld [hBGMapAddress + 1], a ret - .Attr: ld a, 1 ld [rVBK], a @@ -175,11 +166,9 @@ UpdateBGMap:: ; 164c ld [rVBK], a ret - .Tiles: hlcoord 0, 0 - .update ld [hSPBuffer], sp @@ -191,10 +180,8 @@ UpdateBGMap:: ; 164c jr z, .middle ; 2 - THIRD_HEIGHT EQU SCREEN_HEIGHT / 3 - .bottom ld de, 2 * THIRD_HEIGHT * SCREEN_WIDTH add hl, de @@ -212,7 +199,6 @@ THIRD_HEIGHT EQU SCREEN_HEIGHT / 3 xor a jr .start - .middle ld de, THIRD_HEIGHT * SCREEN_WIDTH add hl, de @@ -230,7 +216,6 @@ THIRD_HEIGHT EQU SCREEN_HEIGHT / 3 ld a, 2 jr .start - .top ld sp, hl @@ -242,7 +227,6 @@ THIRD_HEIGHT EQU SCREEN_HEIGHT / 3 ; Next time: middle third ld a, 1 - .start ; Which third to update next time ld [hBGMapThird], a @@ -253,7 +237,6 @@ THIRD_HEIGHT EQU SCREEN_HEIGHT / 3 ; Discrepancy between wTileMap and BGMap ld bc, BG_MAP_WIDTH - (SCREEN_WIDTH - 1) - .row ; Copy a row of 20 tiles rept SCREEN_WIDTH / 2 - 1 @@ -272,17 +255,14 @@ endr dec a jr nz, .row - ld a, [hSPBuffer] ld l, a ld a, [hSPBuffer + 1] ld h, a ld sp, hl ret -; 170a - -Serve1bppRequest:: ; 170a +Serve1bppRequest:: ; Only call during the first fifth of VBlank ld a, [wRequested1bpp] @@ -346,7 +326,6 @@ endr dec b jr nz, .next - ld a, l ld [wRequested1bppDest], a ld a, h @@ -360,10 +339,8 @@ endr ld h, a ld sp, hl ret -; 1769 - -Serve2bppRequest:: ; 1769 +Serve2bppRequest:: ; Only call during the first fifth of VBlank ld a, [wRequested2bpp] @@ -378,14 +355,12 @@ Serve2bppRequest:: ; 1769 ret nc jr _Serve2bppRequest - -Serve2bppRequest_VBlank:: ; 1778 - +Serve2bppRequest_VBlank:: ld a, [wRequested2bpp] and a ret z -_Serve2bppRequest:: ; 177d +_Serve2bppRequest:: ; Copy [wRequested2bpp] 2bpp tiles from [wRequested2bppSource] to [wRequested2bppDest] ld [hSPBuffer], sp @@ -428,7 +403,6 @@ endr dec b jr nz, .next - ld a, l ld [wRequested2bppDest], a ld a, h @@ -442,10 +416,8 @@ endr ld h, a ld sp, hl ret -; 17d3 - -AnimateTileset:: ; 17d3 +AnimateTileset:: ; Only call during the first fifth of VBlank ld a, [hMapAnims] @@ -483,4 +455,3 @@ AnimateTileset:: ; 17d3 pop af rst Bankswitch ret -; 17ff |