re3/src/re3.cpp

#include <direct.h>
#include <csignal>
#include <Windows.h>
#include "common.h"
#include "patcher.h"
#include "Renderer.h"
#include "Credits.h"
#include "Camera.h"
#include "debugmenu_public.h"

void **rwengine = *(void***)0x5A10E1;

GlobalScene &Scene = *(GlobalScene*)0x726768;

DebugMenuAPI gDebugMenuAPI;

WRAPPER void *gtanew(uint32 sz) { EAXJMP(0x5A0690); }
WRAPPER void gtadelete(void *p) { EAXJMP(0x5A07E0); }

// overload our own new/delete with GTA's functions
void *operator new(size_t sz) { return gtanew(sz); }
void operator delete(void *ptr) noexcept { gtadelete(ptr); }

#ifdef USE_PS2_RAND
unsigned __int64 myrand_seed = 1;
#else
unsigned long int myrand_seed = 1;
#endif

int
myrand(void)
{
#ifdef USE_PS2_RAND
	// Use our own implementation of rand, stolen from PS2
	myrand_seed = 0x5851F42D4C957F2D * myrand_seed + 1;
	return ((myrand_seed >> 32) & 0x7FFFFFFF);
#else
	// or original codewarrior rand
	myrand_seed = myrand_seed * 1103515245 + 12345;
	return((myrand_seed >> 16) & 0x7FFF);
#endif
}

void
mysrand(unsigned int seed)
{
	myrand_seed = seed;
}

// platform stuff
char*
GetUserDirectory(void)
{
	static char path[MAX_PATH];
	strcpy(path, "userfiles");
	mkdir(path);
	return path;
}


int (*open_script_orig)(const char *path, const char *mode);
int
open_script(const char *path, const char *mode)
{
	if(GetAsyncKeyState('G') & 0x8000)
		return open_script_orig("main.scm", mode);
	if(GetAsyncKeyState('D') & 0x8000)
		return open_script_orig("main_d.scm", mode);
//	if(GetAsyncKeyState('R') & 0x8000)
		return open_script_orig("main_freeroam.scm", mode);
	return open_script_orig(path, mode);
}

int gDbgSurf;

void (*DebugMenuProcess)(void);
void (*DebugMenuRender)(void);
static void stub(void) { }

void
DebugMenuInit(void)
{
	if(DebugMenuLoad()){
		DebugMenuProcess = (void(*)(void))GetProcAddress(gDebugMenuAPI.module, "DebugMenuProcess");
		DebugMenuRender = (void(*)(void))GetProcAddress(gDebugMenuAPI.module, "DebugMenuRender");
	}
	if(DebugMenuProcess == nil || DebugMenuRender == nil){
		DebugMenuProcess = stub;
		DebugMenuRender = stub;
	}

}

int (*RsEventHandler_orig)(int a, int b);
int
delayedPatches10(int a, int b)
{
	DebugMenuInit();

	if(DebugMenuLoad()){
		DebugMenuAddVarBool8("Debug", "Show Ped Road Groups", (int8*)&gbShowPedRoadGroups, nil);
		DebugMenuAddVarBool8("Debug", "Show Car Road Groups", (int8*)&gbShowCarRoadGroups, nil);
		DebugMenuAddVarBool8("Debug", "Show Collision Polys", (int8*)&gbShowCollisionPolys, nil);
		DebugMenuAddVarBool8("Debug", "Don't render Buildings", (int8*)&gbDontRenderBuildings, nil);
		DebugMenuAddVarBool8("Debug", "Don't render Big Buildings", (int8*)&gbDontRenderBigBuildings, nil);
		DebugMenuAddVarBool8("Debug", "Don't render Peds", (int8*)&gbDontRenderPeds, nil);
		DebugMenuAddVarBool8("Debug", "Don't render Objects", (int8*)&gbDontRenderObjects, nil);
		DebugMenuAddVar("Debug", "Dbg Surface", &gDbgSurf, nil, 1, 0, 34, nil);

		DebugMenuAddCmd("Debug", "Start Credits", CCredits::Start);
		DebugMenuAddCmd("Debug", "Stop Credits", CCredits::Stop);
	}

	return RsEventHandler_orig(a, b);
}

void __declspec(naked) HeadlightsFix()
{
	static const float		fMinusOne = -1.0f;
	_asm
	{
		fld		[esp+708h-690h]
		fcomp	fMinusOne
		fnstsw	ax
		and		ah, 5
		cmp		ah, 1
		jnz		HeadlightsFix_DontLimit
		fld		fMinusOne
		fstp	[esp+708h-690h]

HeadlightsFix_DontLimit:
		fld		[esp+708h-690h]
		fabs
		fld		st
		push		0x5382F2
		retn
	}
}

const int   re3_buffsize = 1024;
static char re3_buff[re3_buffsize];

void re3_assert(const char *expr, const char *filename, unsigned int lineno, const char *func)
{
	int nCode;

	strcpy_s(re3_buff, re3_buffsize, "Assertion failed!" );
	strcat_s(re3_buff, re3_buffsize, "\n" );	
	
	strcat_s(re3_buff, re3_buffsize, "File: ");
	strcat_s(re3_buff, re3_buffsize, filename );
	strcat_s(re3_buff, re3_buffsize, "\n" );	

	strcat_s(re3_buff, re3_buffsize, "Line: " );
	_itoa_s( lineno, re3_buff + strlen(re3_buff), re3_buffsize - strlen(re3_buff), 10 );
	strcat_s(re3_buff, re3_buffsize, "\n");
	
	strcat_s(re3_buff, re3_buffsize, "Function: ");
	strcat_s(re3_buff, re3_buffsize, func );
	strcat_s(re3_buff, re3_buffsize, "\n" );	
	
	strcat_s(re3_buff, re3_buffsize, "Expression: ");
	strcat_s(re3_buff, re3_buffsize, expr);
	strcat_s(re3_buff, re3_buffsize, "\n");

	strcat_s(re3_buff, re3_buffsize, "\n" );
	strcat_s(re3_buff, re3_buffsize, "(Press Retry to debug the application)");


	nCode = ::MessageBoxA(NULL, re3_buff, "RE3 Assertion Failed!",
		MB_ABORTRETRYIGNORE|MB_ICONHAND|MB_SETFOREGROUND|MB_TASKMODAL);

	if (nCode == IDABORT)
	{
		raise(SIGABRT);
		_exit(3);
	}

	if (nCode == IDRETRY)
	{
		__debugbreak();
		return;
	}

	if (nCode == IDIGNORE)
		return;

	abort();
}

void re3_debug(char *format, ...)
{
	va_list va;
	va_start(va, format);
	vsprintf_s(re3_buff, re3_buffsize, format, va);
	va_end(va);

	printf("%s\n", re3_buff);
}

void re3_trace(const char *filename, unsigned int lineno, const char *func, char *format, ...)
{
	char buff[re3_buffsize *2];
	va_list va;
	va_start(va, format);
	vsprintf_s(re3_buff, re3_buffsize, format, va);
	va_end(va);
	
	sprintf_s(buff, re3_buffsize * 2, "[%s.%s:%d]: %s", filename, func, lineno, re3_buff);
	
	OutputDebugStringA(buff);
}

void
patch()
{
	StaticPatcher::Apply();

	Patch<float>(0x46BC61+6, 1.0f);	// car distance
	InjectHook(0x59E460, printf, PATCH_JUMP);

	// stolen from silentpatch (sorry)
	Patch<WORD>(0x5382BF, 0x0EEB);
	InjectHook(0x5382EC, HeadlightsFix, PATCH_JUMP);

	InterceptCall(&open_script_orig, open_script, 0x438869);

	InterceptCall(&RsEventHandler_orig, delayedPatches10, 0x58275E);
}

BOOL WINAPI
DllMain(HINSTANCE hInst, DWORD reason, LPVOID)
{
	if(reason == DLL_PROCESS_ATTACH){

		AllocConsole();
		freopen("CONIN$", "r", stdin);
		freopen("CONOUT$", "w", stdout);
		freopen("CONOUT$", "w", stderr);

		if (*(DWORD*)0x5C1E75 == 0xB85548EC)	// 1.0
			patch();
		else
			return FALSE;
	}

	return TRUE;
}