P41 SetDrawMode

#   ROUTINE: P41 SetDrawMode
#       Called by screen color change many times, but also by windows coming up... Load sprite
#       Parameters:
#           r4  = Primative address
#           r5  = DrawMode Privaleges:
#                    0: Drawing not allowed in display area
#                    1: Drawing allowed in display area
#           r6  = Dithering
#                    0: off
#                    1: on
#           r7  = TPAGE ID
#           SP1 = pointer to texture window (format RECT)

800254cc: 27bdffe0 addiu r29,r29,-0x0020
800254d0: afb00010 sw r16,0x0010(r29)
800254d4: 00808021 addu r16,r4,r0
800254d8: 00a02021 addu r4,r5,r0
800254dc: 34020002 ori r2,r0,0x0002
800254e0: 00c02821 addu r5,r6,r0
800254e4: afb10014 sw r17,0x0014(r29)
800254e8: 8fb10030 lw r17,0x0030(r29)
800254ec: 30e6ffff andi r6,r7,0xffff
800254f0: afbf0018 sw r31,0x0018(r29)
800254f4: 0c0095f2 jal 0x800257c8                 000257c8 - 00025820 (DrawModePrivaleges, Dithering, Tpage ID)
800254f8: a2020003 sb r2,0x0003(r16)              
800254fc: ae020004 sw r2,0x0004(r16)              store drawmode
80025500: 0c009681 jal 0x80025a04                 00025a04 - 00025a84 (Ptr to texture window)
80025504: 02202021 addu r4,r17,r0
80025508: ae020008 sw r2,0x0008(r16)
8002550c: 8fbf0018 lw r31,0x0018(r29)
80025510: 8fb10014 lw r17,0x0014(r29)
80025514: 8fb00010 lw r16,0x0010(r29)
80025518: 27bd0020 addiu r29,r29,0x0020
8002551c: 03e00008 jr r31
80025520: 00000000 nop