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fix power point convergence value with customs

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CrazyRedMachine 2024-01-04 15:25:59 +01:00
parent dc987c46ac
commit 0cb685ef4b
1 changed files with 67 additions and 10 deletions
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77
popnhax/dllmain.cc
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@ -31,7 +31,7 @@
#include "SearchFile.h"
#define PROGRAM_VERSION "1.10.dev"
#define PROGRAM_VERSION "1.10"
const char *g_game_dll_fn = NULL;
const char *g_config_fn = NULL;
@ -2677,13 +2677,6 @@ pfree_apply:
MH_CreateHook((LPVOID)patch_addr, (LPVOID)hook_pfree_pplist_inject,
(void **)&real_pfree_pplist_inject);
}
/* prevent crash when playing only customs in a credit */
{
if (!find_and_patch_hex(g_game_dll_fn, "\x0F\x8E\x5C\xFF\xFF\xFF\xEB\x04", 8, 6, "\x90\x90", 2))
{
LOG("popnhax: pfree: cannot patch end list pointer\n");
}
}
/* restore pp_list pointer so that it is freed at end of credit */
{
@ -5116,6 +5109,33 @@ static bool patch_db_fix_cursor(){
return true;
}
void (*real_pp_mean_compute)();
void hook_pp_mean_compute()
{
__asm("test ecx, ecx\n");
__asm("jnz divide_list\n");
__asm("mov eax, 0\n");
__asm("jmp skip_divide\n");
__asm("divide_list:\n");
__asm("div ecx\n");
__asm("skip_divide:\n");
real_pp_mean_compute();
}
void (*real_pp_convergence_loop)();
void hook_pp_convergence_loop()
{
__asm("movzx eax, word ptr[ebx]\n");
__asm("cmp eax, 0xBB8\n");
__asm("jl conv_loop_rearm\n");
__asm("mov al, 0\n");
__asm("jmp conv_loop_leave\n");
__asm("conv_loop_rearm:\n");
__asm("mov al, 1\n");
__asm("conv_loop_leave:\n");
real_pp_convergence_loop();
}
bool patch_db_power_points()
{
DWORD dllSize = 0;
@ -5145,7 +5165,20 @@ bool patch_db_power_points()
g_pfree_song_offset = *(uint8_t *) ((int64_t)data + pattern_offset + 0x03);
}
/* Adapt convergence value computation (skip cs_omni and customs) */
/* skip cs_omni and customs in power point convergence value */
{
int64_t pattern_offset = search(data, dllSize, "\x8B\x6C\x24\x30\x8B\x4C\x24\x2C", 8, 0);
if (pattern_offset == -1) {
LOG("popnhax: patch_db: cannot find power point convergence value computation loop\n");
return false;
}
uint64_t patch_addr = (int64_t)data + pattern_offset - 0x08;
MH_CreateHook((LPVOID)(patch_addr), (LPVOID)hook_pp_convergence_loop,
(void **)&real_pp_convergence_loop);
}
/* make sure they cannot count (sanity check) */
{
int64_t pattern_offset = search(data, dllSize, "\x84\xC0\x75\x11\x8D\x44\x24\x38", 8, 0);
if (pattern_offset == -1) {
@ -5179,9 +5212,33 @@ bool patch_db_power_points()
return false;
}
skip_pp_list_elem = (void(*)()) ((int64_t)data + jump_addr_offset);
}
/* prevent crash when playing only customs in a credit */
{
if (!find_and_patch_hex(g_game_dll_fn, "\x0F\x8E\x5C\xFF\xFF\xFF\xEB\x04", 8, 6, "\x90\x90", 2))
{
LOG("popnhax: patch_db: cannot patch end list pointer\n");
}
}
/* prevent another crash when playing only customs in a credit (sanity check) */
{
int64_t pattern_offset = search(data, dllSize, "\xC1\xF9\x02\x33\xD2\xF7\xF1\x8B\xC8", 9, 0);
if (pattern_offset == -1) {
LOG("popnhax: patch_db: cannot find power point mean computation\n");
return false;
}
uint64_t patch_addr = (int64_t)data + pattern_offset + 0x05;
patch_memory(patch_addr, (char*)"\x90\x90", 2); // erase original div ecx (is taken care of in hook_pp_mean_compute)
/* fix possible divide by zero error */
MH_CreateHook((LPVOID)patch_addr, (LPVOID)hook_pp_mean_compute,
(void **)&real_pp_mean_compute);
}
LOG("popnhax: patch_db: power point computation fixed\n");
return true;
}