Added Bombos platform in first Ice Palace room

LTTP_RND_GeneralBugfixes.asm

@@ -124,7 +124,7 @@ incsrc doorframefixes.asm
 ;incsrc shopkeeper.asm
 incsrc cuccostorm.asm
 incsrc roomloading.asm
-incsrc graphicsoverride.asm
+incsrc icepalacegraphics.asm
 incsrc hashalphabet.asm ; <- TAKE OUT THE EXTRA ORGS IN HERE - THIS IS WHY WE COULDN'T ADD MORE FILES EARLIER
 warnpc $A18000
 

graphicsoverride.asm

@@ -1,62 +0,0 @@
-macro OverwriteVramTile(firstTileIndex, count)
-    LDA.w #<firstTileIndex>+512*8*8*4/16
-    LDX.b #<count>
-    JSR UploadTileToVram
-endmacro
-
-GraphicsOverrideHook:
-    JSL .resumeOriginalCode
-
-    LDA $0A ; Floor tileset loaded
-    CMP #$0A ; Floor tileset index used by Ice and Mire
-    BEQ .loadedIceOrMireFloor
-    RTL
-
-.loadedIceOrMireFloor
-    LDA $040C ; Load dungeon number
-    CMP #$12 ; Ice Palace
-    BEQ .isInIcePalace
-    RTL
-
-.isInIcePalace
-    ; We've just loading the floor tiles in Ice Palace.
-    ; Replace the bridge tiles with the bombos medallion
-
-    LDA.b #IcePalaceMedallionGfx>>16
-    STA $02
-    REP #$20
-    LDA.w #IcePalaceMedallionGfx
-    STA $00
-
-    %OverwriteVramTile($CA, 2)
-    %OverwriteVramTile($DA, 2)
-
-    SEP #$20
-    RTL
-
-.resumeOriginalCode
-    ; Overwritten instructions:
-    PHB
-    LDA.b #$00
-    PHA
-    PLB
-    LDA.b #$80
-    JML GraphicsOverrideResume
-
-; A = VRAM word address to upload to (Actual VRAM address / 2)
-; X = Tiles to upload
-; $00-$02 = Pointer to graphics data
-UploadTileToVram:
-    ; TODO: This should probably be optimized with a DMA
-    STA $2116
-    TXA : ASL #4 : TAX ; X = Amount of words to upload (Tiles to upload * 16)
--   LDA [$00]
-    STA $2118
-    INC $00
-    INC $00
-    DEX
-    BNE -
-    RTS
-
-IcePalaceMedallionGfx:
-    incbin ice_bombos_floor.bin

hooks.asm

@@ -1945,17 +1945,9 @@ org $02C2F3 ; <- Bank02.asm:10391 (JSL Dungeon_LoadRoom)
 ;================================================================================
 ; Hook for graphicsoverride.asm
 ;--------------------------------------------------------------------------------
-org $00E1DB ; <- Bank00.asm:4866 (PHB : PHK : PLB : LDA.b #$80)
+org $00E64D ; <- Bank00.asm:5656 (STZ $00 : STX $01 : STA $02)
-    JML GraphicsOverrideHook
+    JML BgGraphicsLoading
-    NOP
+    BgGraphicsLoadingCancel:
-    GraphicsOverrideResume:
+    RTS : NOP
-;--------------------------------------------------------------------------------
+    BgGraphicsLoadingResume:
-org $028BE7 ; <- Bank02.asm:2299 (JSL Dungeon_LoadRoom)
-    JSL LoadRoomHook
-;--------------------------------------------------------------------------------
-org $029309 ; <- Bank02.asm:3533 (JSL Dungeon_LoadRoom)
-    JSL LoadRoomHook
-;--------------------------------------------------------------------------------
-org $02C2F3 ; <- Bank02.asm:10391 (JSL Dungeon_LoadRoom)
-    JSL LoadRoomHook
 ;================================================================================

icepalacegraphics.asm

@@ -0,0 +1,47 @@
+BgGraphicsLoading:
+    ; Instructions overwritten
+    STZ $00
+    STX $01
+    STA $02
+
+    ; Y = Graphics file being loaded
+    CPY #$0A ; 0A = Ice/Mire floor file
+    BNE .useDefaultGraphics
+
+    LDA $040C ; Dungeon number
+    CMP #$12 ; Ice Palace
+    BEQ .useSpecialIcePalaceFile
+
+.useDefaultGraphics
+    JML BgGraphicsLoadingResume
+
+.useSpecialIcePalaceFile
+    ; We're loading the floor tiles in Ice Palace. Instead of the normal file,
+    ; load another one that replaces the bridge tiles with the Bombos medallion
+
+    LDA $FFFFFF
+
+    LDA.b #IcePalaceFloorGfx>>16
+    STA $02
+    REP #$20
+    LDA.w #IcePalaceFloorGfx
+    STA $00
+    LDX.b #64*2 ; Tiles to load * 2
+-
+    ; Unrolled loop to upload half a tile
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    LDA [$00] : STA $2118 : INC $00 : INC $00
+    DEX
+    BNE -
+
+    SEP #$20
+    JML BgGraphicsLoadingCancel
+
+IcePalaceFloorGfx:
+    incbin ice_palace_floor.bin