desync: freeze deadupfall physics position

Normally, the fighter's position is centered with the camera by directly
updating the model's position with respect to the camera's view matrix.

However, it also updates the fighter's physics position. This becomes a
problem when screen shake is disabled on one client, as it will cause
the physics position of the fighter being screen ko'd to differ slightly.
This only seems to matter in the case of Ice Climbers, because Nana uses
Popo's physics position to determine her next action.

Online/Core/FreezeDeadUpFallPhysics/InitHitVelocity.asm

@@ -0,0 +1,23 @@
+################################################################################
+# Address: 0x800d4c1c
+################################################################################
+
+.include "Common/Common.s"
+.include "Online/Online.s"
+
+# orig instruction
+  stw	r0, 0x2344 (r31)
+
+# init custom velocity
+  lfs	f0, 0x0030 (r30)  # y velocity
+  stfs f0, 0x2348 (r31)
+  lfs	f0, 0x003C (r30)  # z velocity
+  stfs f0, 0x234C (r31)
+
+# zero original velocity
+  li r3,0
+  stw r3, 0x80 (r31)
+  stw r3, 0x84 (r31)
+  stw r3, 0x88 (r31)
+
+Exit:

Online/Core/FreezeDeadUpFallPhysics/UpdateFallVelocity.asm

@@ -0,0 +1,45 @@
+################################################################################
+# Address: 0x800d4d68
+################################################################################
+.include "Common/Common.s"
+.include "Online/Online.s"
+
+/*
+During DeadUpFall, after the fighter hits the screen
+
+0x2348 = previously used variable, now storing Y velocity
+0x234C = previously used variable, now storing Z velocity
+0x2350 = position vector
+0x235c = temp velocity vector (contents cleared when leaving function so cant use this across frames)
+*/
+
+# orig instruction
+  lfs	f1, 0x0034 (r30)  # gravity
+  lfs	f2, 0x0038 (r30)  # terminal velocity
+  lfs	f3, 0x2348 (r31)  # curr Y velocity
+
+# subtract gravity
+  fsub	f3, f3, f1  
+  fneg f2, f2        # negate terminal velocity
+  fcmpo cr0, f3, f2  # limit velocity
+  bgt StoreVelocity
+# use terminal velocity
+  fmr f3, f2
+StoreVelocity:
+  stfs	f3, 0x2348 (r31)
+
+UpdateVector:
+# update Y position
+  lfs f1, 0x2360 (r31)    # y component of temp velocity
+  lfs	f2, 0x2348 (r31)    # curr Y velocity
+  fadds f1,f1,f2
+  stfs f1, 0x2360 (r31)   # y component of temp velocity
+# update Z position 
+  lfs	f1, 0x234C (r31)   # curr Z velocity
+  lfs f2, 0x2364 (r31)   # Z component of temp velocity
+  fadds f1,f1,f2
+  stfs f1, 0x2364 (r31)   # Z component of temp velocity
+
+
+Exit:
+  branch r12,0x800d4d84

Online/Core/FreezeDeadUpFallPhysics/UpdateModelPos.asm

@@ -0,0 +1,40 @@
+################################################################################
+# Address: 0x80080e80
+################################################################################
+.include "Common/Common.s"
+.include "Online/Online.s"
+
+/*
+The fighter's position is centered with the camera by directly
+updating the model's position with respect to the camera's view matrix.
+
+However, it also updates the fighter's physics position. This becomes a
+problem when screen shake is disabled on one client, as it will cause
+the physics position of the fighter being screen ko'd to differ slightly.
+This only seems to matter in the case of Ice Climbers, because Nana uses
+Popo's physics position to determine her next action.
+*/
+
+backup
+
+# update camera mtx and return mtx ptr?
+  branchl r12,0x800310b8
+# get inverted viewing mtx ptr
+  branchl r12,0x80369808
+
+# mult with position vector
+  addi	r4, r30, 0x2350   # position vector
+  addi	r5, sp, 0x80    # output to temp vector on stack
+  branchl r12,0x80342aa8
+
+# update model position
+  lwz r3, 0x80(sp) # vector X
+  stw r3, 0x38(31) # model X
+  lwz r3, 0x84(sp) # vector Y
+  stw r3, 0x3c(31) # model Y
+  lwz r3, 0x88(sp) # vector Z
+  stw r3, 0x40(31) # model Z
+
+Exit:
+  restore
+  branch r12,0x80080ee4

Output/Netplay/GALE01r2.ini

@@ -1832,6 +1832,42 @@ BA810008 800100B4
 800100B4 382100B0
 7C0803A6 7FC3F378
 60000000 00000000
+C20D4C1C 00000005 #Online/Core/FreezeDeadUpFallPhysics/InitHitVelocity.asm
+901F2344 C01E0030
+D01F2348 C01E003C
+D01F234C 38600000
+907F0080 907F0084
+907F0088 00000000
+C20D4D68 0000000B #Online/Core/FreezeDeadUpFallPhysics/UpdateFallVelocity.asm
+C03E0034 C05E0038
+C07F2348 FC630828
+FC401050 FC031040
+41810008 FC601090
+D07F2348 C03F2360
+C05F2348 EC21102A
+D03F2360 C03F234C
+C05F2364 EC21102A
+D03F2364 3D80800D
+618C4D84 7D8903A6
+4E800420 00000000
+C2080E80 00000011 #Online/Core/FreezeDeadUpFallPhysics/UpdateModelPos.asm
+7C0802A6 90010004
+9421FF50 BE810008
+3D808003 618C10B8
+7D8903A6 4E800421
+3D808036 618C9808
+7D8903A6 4E800421
+389E2350 38A10080
+3D808034 618C2AA8
+7D8903A6 4E800421
+80610080 907F0038
+80610084 907F003C
+80610088 907F0040
+BA810008 800100B4
+382100B0 7C0803A6
+3D808008 618C0EE4
+7D8903A6 4E800420
+60000000 00000000
 04019260 48000034 #Online/Core/Hacks/ForceNoDiskCrash.asm
 C2376304 0000000B #Online/Core/Hacks/ForceNoVideoAssert.asm
 48000031 7C6802A6

Output/Netplay/GALJ01r2.ini

@@ -1832,6 +1832,42 @@ BA810008 800100B4
 800100B4 382100B0
 7C0803A6 7FC3F378
 60000000 00000000
+C20D4C1C 00000005 #Online/Core/FreezeDeadUpFallPhysics/InitHitVelocity.asm
+901F2344 C01E0030
+D01F2348 C01E003C
+D01F234C 38600000
+907F0080 907F0084
+907F0088 00000000
+C20D4D68 0000000B #Online/Core/FreezeDeadUpFallPhysics/UpdateFallVelocity.asm
+C03E0034 C05E0038
+C07F2348 FC630828
+FC401050 FC031040
+41810008 FC601090
+D07F2348 C03F2360
+C05F2348 EC21102A
+D03F2360 C03F234C
+C05F2364 EC21102A
+D03F2364 3D80800D
+618C4D84 7D8903A6
+4E800420 00000000
+C2080E80 00000011 #Online/Core/FreezeDeadUpFallPhysics/UpdateModelPos.asm
+7C0802A6 90010004
+9421FF50 BE810008
+3D808003 618C10B8
+7D8903A6 4E800421
+3D808036 618C9808
+7D8903A6 4E800421
+389E2350 38A10080
+3D808034 618C2AA8
+7D8903A6 4E800421
+80610080 907F0038
+80610084 907F003C
+80610088 907F0040
+BA810008 800100B4
+382100B0 7C0803A6
+3D808008 618C0EE4
+7D8903A6 4E800420
+60000000 00000000
 04019260 48000034 #Online/Core/Hacks/ForceNoDiskCrash.asm
 C2376304 0000000B #Online/Core/Hacks/ForceNoVideoAssert.asm
 48000031 7C6802A6