Zelda Disk Custom Code

ddhook_scenedetect:
    lh a0,0xA4(a0)
    bnez a0,ddhook_scenedetect_notdeku
    lui t0,(ddhook_list_start>>16)
    addiu t0,(ddhook_list_start&0xFFFF)
    lui t1,(ddhook_roomload>>16)
    addiu t1,(ddhook_roomload&0xFFFF)
    sw t1,8(t0)
    b ddhook_scenedetect_return
    nop
ddhook_scenedetect_notdeku:
    lui t0,(ddhook_list_start>>16)
    addiu t0,(ddhook_list_start&0xFFFF)
    sw 0,8(t0)
ddhook_scenedetect_return:
    jr ra
    nop

ddhook_roomload:
    //A0=p->Scene Heap
    //A1=p->Room Heap
    //A2=Room ID

    addiu sp,sp,-0x10
    sw ra,4(sp)

    lw a0,0x0134(a1)    //load Room List Pointer
    sll a3,a2,3         //Room ID * 8
    addu a2,a0,a3       //calculate offset from Room ID
    lw a0,0x34(a1)      //A0=RAM Address
    lw a3,0x8(a2)       //RoomEnd
    lw a1,0x0(a2)       //RoomStart (A1=VROM Address)
    subu a2,a3,a1       //A2=Size

    jal 0x801C7C1C  //read from disk
    nop

    lw ra,4(sp)
    addiu sp,sp,0x10
    jr ra
    nop