Focus Speed Event Instruction

#   ROUTINE: FOCUS SPEED EVENT INSTRUCTION
#       Parameters:
#           r4 = (params) Event instruction parameters
#           r5 = (p2) *(0x80165f9c) + 0x68
#           r6 = (p3) *(0x80165f9c) + 0x74

80147780: 27bdffa0 addiu r29,r29,-0x0060
80147784: afb40048 sw r20,0x0048(r29)
80147788: 0080a021 addu r20,r4,r0                   #   params
8014778c: afb1003c sw r17,0x003c(r29)
80147790: 00a08821 addu r17,r5,r0                   #   p2OffsetPtr = p2
80147794: afb00038 sw r16,0x0038(r29)
80147798: 00c08021 addu r16,r6,r0                   #   p3
8014779c: afbf005c sw r31,0x005c(r29)
801477a0: afbe0058 sw r30,0x0058(r29)
801477a4: afb70054 sw r23,0x0054(r29)
801477a8: afb60050 sw r22,0x0050(r29)
801477ac: afb5004c sw r21,0x004c(r29)
801477b0: afb30044 sw r19,0x0044(r29)
801477b4: 0c05181e jal 0x80146078                   #   speed = Load Halfword (params);
801477b8: afb20040 sw r18,0x0040(r29)
801477bc: 00021400 sll r2,r2,0x10
801477c0: 00021403 sra r2,r2,0x10                   #   speed
801477c4: 26940003 addiu r20,r20,0x0003             #   params + 3
801477c8: 00009821 addu r19,r0,r0                   #   r19 = 0
801477cc: 341e2710 ori r30,r0,0x2710                #   0x2710
801477d0: 27b70010 addiu r23,r29,0x0010             #   localBasePtr
801477d4: 02e09021 addu r18,r23,r0                  #   localPtr = localBasePtr
801477d8: 0200a821 addu r21,r16,r0                  #   p3OffsetPtr = p3
801477dc: 02808021 addu r16,r20,r0                  #   paramPtr = params + 3               // First param of the following Camera instruction
801477e0: afa20030 sw r2,0x0030(r29)                #   speed
                                                    #   do {
801477e4: 0c05181e jal 0x80146078                   #       param = Load Halfword (paramPtr);       
801477e8: 02002021 addu r4,r16,r0               
801477ec: 00021400 sll r2,r2,0x10
801477f0: 00021c03 sra r3,r2,0x10                   #       param
801477f4: 147e0003 bne r3,r30,0x80147804            #       if (param == 0x2710) {
801477f8: 00000000 nop
801477fc: 08051e09 j 0x80147824
80147800: ae400000 sw r0,0x0000(r18)                #           *localPtr = 0
                                                    #       } else {
80147804: 8e220000 lw r2,0x0000(r17)                #           dividend = *p2OffsetPtr
80147808: 00000000 nop                              
8014780c: 04410002 bgez r2,0x80147818               #           if (dividend < 0) {
80147810: 00000000 nop
80147814: 244203ff addiu r2,r2,0x03ff               #               dividend = dividend + 1023
                                                    #           }
80147818: 00021283 sra r2,r2,0x0a                   #           dividend / 1024
8014781c: 00621023 subu r2,r3,r2                    #           param - (dividend / 1024)
80147820: ae420000 sw r2,0x0000(r18)                #           *localPtr = param - (dividend / 1024)
                                                    #       }
80147824: 0c05181e jal 0x80146078                   #       param = Load Halfword (paramPtr + 6); 
80147828: 26040006 addiu r4,r16,0x0006
8014782c: 00021400 sll r2,r2,0x10
80147830: 00021c03 sra r3,r2,0x10                   #       param
80147834: 147e0003 bne r3,r30,0x80147844            #       if (param == 0x2710) {
80147838: 00000000 nop
8014783c: 08051e15 j 0x80147854
80147840: ae400010 sw r0,0x0010(r18)                #           *(localPtr + 16) = 0
                                                    #       } else {
80147844: 8ea20000 lw r2,0x0000(r21)                #           *p3OffsetPtr
80147848: 00000000 nop
8014784c: 00621023 subu r2,r3,r2                    #           param - *p3OffsetPtr
80147850: ae420010 sw r2,0x0010(r18)                #           *(localPtr + 16) = param - *p3OffsetPtr
                                                    #       }
80147854: 8e420000 lw r2,0x0000(r18)                #       local = *localPtr
80147858: 00000000 nop
8014785c: 00420018 mult r2,r2                       
80147860: 00001812 mflo r3                          #       local * local
80147864: 8e420010 lw r2,0x0010(r18)                #       local2 = *(localPtr + 10)
80147868: 00000000 nop
8014786c: 00420018 mult r2,r2                       
80147870: 26b50004 addiu r21,r21,0x0004             #       p3OffsetPtr = p3OffsetPtr + 4
80147874: 26100002 addiu r16,r16,0x0002             #       paramPtr = paramPtr + 2
80147878: 26310004 addiu r17,r17,0x0004             #       p2OffsetPtr = p2OffsetPtr + 4
8014787c: 26520004 addiu r18,r18,0x0004             #       localPtr = localPtr + 4
80147880: 00001012 mflo r2                          #       local2 * local2
80147884: 02c2b021 addu r22,r22,r2                  #       r22 = r22 + (local2 * local2)           // r22 starts as uninitialized register value?????
80147888: 26e2000c addiu r2,r23,0x000c              #       localBasePtr + 12
8014788c: 0242102a slt r2,r18,r2
80147890: 1440ffd4 bne r2,r0,0x801477e4
80147894: 02639821 addu r19,r19,r3                  #       r19 = r19 + (local * local)
                                                    #   } while (localPtr < (localBasePtr + 12));
80147898: 00131040 sll r2,r19,0x01                  #   r19 * 2
8014789c: 0056102a slt r2,r2,r22
801478a0: 10400003 beq r2,r0,0x801478b0             #   if ((r19 * 2) < r22) {
801478a4: 001617c2 srl r2,r22,0x1f                  
801478a8: 02c21021 addu r2,r22,r2
801478ac: 00029843 sra r19,r2,0x01                  #       r19 = (r22 * 2) / 2
                                                    #   }
801478b0: 0c006fce jal 0x8001bf38                   #   result_0x1bf38 = Frame Timing Related? (0x1bf38) (r19);
801478b4: 02602021 addu r4,r19,r0
801478b8: 8fa70030 lw r7,0x0030(r29)                #   speed
801478bc: 00000000 nop
801478c0: 0047001a div r2,r7                        
801478c4: 00009812 mflo r19                         #   frames = result_0x1bf38 / speed
801478c8: 00000000 nop
801478cc: 16600002 bne r19,r0,0x801478d8
801478d0: 2684000e addiu r4,r20,0x000e              #   cameraFramesPtr = params + 17
                                                    #   if (frames == 0) {
801478d4: 34130001 ori r19,r0,0x0001                #       frames = 1
                                                    #   }
801478d8: 00132c00 sll r5,r19,0x10
801478dc: 0c051825 jal 0x80146094                   #   Store Halfword (cameraFramesPtr, frames);
801478e0: 00052c03 sra r5,r5,0x10
801478e4: 8fbf005c lw r31,0x005c(r29)
801478e8: 8fbe0058 lw r30,0x0058(r29)
801478ec: 8fb70054 lw r23,0x0054(r29)
801478f0: 8fb60050 lw r22,0x0050(r29)
801478f4: 8fb5004c lw r21,0x004c(r29)
801478f8: 8fb40048 lw r20,0x0048(r29)
801478fc: 8fb30044 lw r19,0x0044(r29)
80147900: 8fb20040 lw r18,0x0040(r29)
80147904: 8fb1003c lw r17,0x003c(r29)
80147908: 8fb00038 lw r16,0x0038(r29)
8014790c: 27bd0060 addiu r29,r29,0x0060
80147910: 03e00008 jr r31
80147914: 00000000 nop