From 8b35d07fc9ffb7ec6cf3d0ef4920961061fef672 Mon Sep 17 00:00:00 2001
From: anzz1 <anzz1@live.com>
Date: Tue, 25 Mar 2025 06:17:05 +0200
Subject: [PATCH] 59NL DrawDistance client function (beta)

Currently beta quality, map objects that fade like boxes, and Pioneer's
background billboards and elevators still have regular draw distance.
TODO: 90% of stuff is included, bring home the last 10%.
---
 .../DrawDistance/DrawDistance.59NL.patch.s    | 146 ++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 system/client-functions/DrawDistance/DrawDistance.59NL.patch.s

diff --git a/system/client-functions/DrawDistance/DrawDistance.59NL.patch.s b/system/client-functions/DrawDistance/DrawDistance.59NL.patch.s
new file mode 100644
index 00000000..4d9efff9
--- /dev/null
+++ b/system/client-functions/DrawDistance/DrawDistance.59NL.patch.s
@@ -0,0 +1,146 @@
+# Currently beta quality, map objects that fade like boxes, and Pioneer's
+# background billboards and elevators still have regular draw distance.
+# TODO: 90% of stuff is included, bring home the last 10%.
+
+.meta name="Draw Distance"
+.meta description="Extends the draw\ndistance of many\nobjects"
+
+entry_ptr:
+reloc0:
+  .offsetof start
+
+write_call_func:
+  .include  WriteCallToCode-59NL
+
+start:
+  mov       eax, 0x41800000        # Environment clip distance mod 16.0f
+  mov       [0x0097F1B8], eax      # This affects mostly static map objects
+  mov       [0x0097F1BC], eax
+  mov       [0x0097F1C0], eax
+
+  mov       ax, 0x9090
+  mov       [0x00689B5B], ax       # Players draw distance 10000.0f always
+  mov       eax, 0x41000000        # Use newly acquired skipped branch room
+  mov       [0x00689B65], eax      # to store our float multiplier
+
+  call      patch_func_1           # Floor items
+  call      patch_func_2           # Whole bunch of stuff, including NPCs
+  call      patch_func_3           # Duplicate function from above, reuse same hook
+  call      patch_func_4           # TODO: Which objects this affects?
+  call      patch_func_5           # TODO: This one too?
+  call      patch_func_6           # TODO: And this one?
+  ret
+
+# Floor items
+patch_func_1:
+  pop       ecx
+  push      8
+  push      0x005C5267
+  call      get_code_size1
+  .deltaof  patch_code1, patch_code_end1
+get_code_size1:
+  pop       eax
+  push      dword [eax]
+  call      patch_code_end1
+patch_code1:
+  mov       edx, [esp + 0x18]
+  fld       st0, dword [0x00689B65]
+  fld       st0, dword [esp + 0x14]
+  fmulp     st1, st0
+  ret
+patch_code_end1:
+  push      ecx
+  jmp       write_call_func
+
+# Whole bunch of stuff, including NPCs
+patch_func_2:
+  pop       ecx
+  push      9
+  push      0x007BA472
+  call      get_code_size2
+  .deltaof  patch_code2, patch_code_end2
+get_code_size2:
+  pop       eax
+  push      dword [eax]
+  call      patch_code_end2
+patch_code2:
+  test      eax, 0x400
+  fld       st0, dword [0x00689B65]
+  fld       st0, dword [esp + 0x2C]
+  fmulp     st1, st0
+  ret
+patch_code_end2:
+  push      ecx
+  jmp       write_call_func
+
+# Duplicate function from above, reuse same hook
+patch_func_3:
+  mov       eax, dword [0x007BA473]
+  add       eax, 0x002A1C74
+  mov       dword [0x005187FF], eax
+  mov       byte [0x005187FE], 0xE8
+  mov       dword [0x00518803], 0x90909090
+  ret
+
+# TODO: Which objects this affects?
+patch_func_4:
+  pop       ecx
+  push      7
+  push      0x00616FFC
+  call      get_code_size4
+  .deltaof  patch_code4, patch_code_end4
+get_code_size4:
+  pop       eax
+  push      dword [eax]
+  call      patch_code_end4
+patch_code4:
+  lea       edx, [edi + 0x38]
+  fld       st0, dword [0x00689B65]
+  fld       st0, dword [esp + 0x14]
+  fmulp     st1, st0
+  ret
+patch_code_end4:
+  push      ecx
+  jmp       write_call_func
+
+# TODO: This one too?
+patch_func_5:
+  pop       ecx
+  push      6
+  push      0x0064394C
+  call      get_code_size5
+  .deltaof  patch_code5, patch_code_end5
+get_code_size5:
+  pop       eax
+  push      dword [eax]
+  call      patch_code_end5
+patch_code5:
+  fld       st0, dword [0x00689B65]
+  fld       st0, dword [esp + 0x28]
+  fmulp     st1, st0
+  fchs      st0
+  ret
+patch_code_end5:
+  push      ecx
+  jmp       write_call_func
+
+# TODO: And this one?
+patch_func_6:
+  pop       ecx
+  push      6
+  push      0x0065B985
+  call      get_code_size6
+  .deltaof  patch_code6, patch_code_end6
+get_code_size6:
+  pop       eax
+  push      dword [eax]
+  call      patch_code_end6
+patch_code6:
+  mov       ebp, ecx
+  fld       st0, dword [0x00689B65]
+  fld       st0, dword [esp + 0x30]
+  fmulp     st1, st0
+  ret
+patch_code_end6:
+  push      ecx
+  jmp       write_call_func