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fix enhanced polling judgement correction

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CrazyRedMachine 2024-06-02 03:04:40 +02:00
parent c39bce4e1f
commit 2b7ba52f1a
1 changed files with 37 additions and 9 deletions
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46
popnhax/dllmain.cc
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@ -33,7 +33,7 @@
#include "SearchFile.h"
#define PROGRAM_VERSION "1.12.dev"
#define PROGRAM_VERSION "1.12.dev.pollfix"
const char *g_game_dll_fn = NULL;
const char *g_config_fn = NULL;
@ -3609,20 +3609,48 @@ int usbPadReadHook(uint32_t *pad_bits)
uint32_t g_offset_fix[9] = {0};
uint8_t g_poll_index = 0;
uint32_t g_poll_offset = 0;
void (*real_enhanced_poll)();
void patch_enhanced_poll() {
/* eax contains button being checked [0-8]
* esi contains delta about to be evaluated
* we need to do esi -= buttonGetMillis([%eax]); to fix the offset accurately */
__asm("nop\n");
__asm("nop\n");
__asm("mov %0, al\n":"=m"(g_poll_index): :);
g_poll_offset = buttonGetMillis(g_poll_index);
__asm("sub esi, %0\n": :"b"(g_poll_offset));
g_offset_fix[g_poll_index] = g_poll_offset;
__asm("push edx\n");
real_enhanced_poll();
__asm("mov %0, al\n":"=m"(g_poll_index): :);
/* reimplem buttonGetMillis(), result in ebx */
__asm("xor ebx,ebx\n");
__asm("mov edx,dword ptr ds:[eax*4+%0]\n"::"d"(g_button_state));
__asm("cmp edx,0xFFFFFFFF\n");
__asm("je button_state_empty\n");
__asm("push ecx\n");
__asm("push edx\n");
__asm("call %P0" : : "i"(timeGetTime));
__asm("pop edx\n");
__asm("pop ecx\n");
__asm("cmp edx,eax\n");
__asm("jbe button_has_been_pressed\n");
__asm("restore_eax:\n");
__asm("movzx eax, %0\n": :"d"(g_poll_index));
/* leave buttonGetMillis */
__asm("button_state_empty:\n");
__asm("sub esi, ebx\n"); // actual delta correction
__asm("lea edx,dword ptr [eax*4+%0]\n"::"d"(g_offset_fix));
__asm("mov [edx], ebx\n"::); // save correction value in g_offset_fix[g_poll_index];
__asm("pop edx\n");
__asm("mov eax, %0\n" : : "i"(&real_enhanced_poll));
__asm("jmp [eax]");
__asm("button_has_been_pressed:\n");
__asm("sub eax,edx\n"); // eax = correction value (currTime - g_button_state[g_poll_index]);
__asm("mov ebx, eax\n");// put correction value in ebx
__asm("jmp restore_eax\n");
}
static HANDLE enhanced_polling_thread;