spidey-decomp/utils.cpp

#include "utils.h"
#include "m3dcolij.h"
#include <cstdlib>
#include <cmath>

extern u32 gLineToItemRelated;
extern CBody *EnvironmentalObjectList;
extern SLineInfo gLineInfo;
extern i32 gGetGroundRelated;


// @NotOk
// @Test
u32 Utils_CrapDist(const CVector& a,const CVector& b){

	
	i32 dX = a.vx - b.vx;
	i32 dY = a.vy - b.vy;
	i32 dZ = a.vz - b.vz;

    if (dX < 0) {
        dX = -dX;
    }

    if (dY < 0) {
        dY = -dY;
    }

    if (dZ < 0) {
        dZ = -dZ;
    }

    if (dX < dY){

        if (dY < dZ){
			return (dZ + (dX >>2) + (dY >>1)) >> 12;
		}

		if(dZ < dX){
			return ((dZ >> 2) + (dX >> 1) + dY) >> 12;
		}

		return ((dZ >> 1) + (dX >> 2) + dY) >> 12;
    }

    if (dX < dZ){
        return (dZ + (dX >>1) + (dY >>2)) >> 12;
    }

    if (dZ < dY){
        return ((dZ >> 2) + dX + (dY >>1)) >> 12;
    }

    return ((dZ >> 1) + dX + (dY >>2)) >> 12;
}

// @NotOk
// @Test
u32 Utils_CrapXZDist(const CVector& a,const CVector& b) {
    CVector tmp = a;
    tmp.vy = b.vy;
    return Utils_CrapDist(tmp, b);
}

int Utils_CompareStrings(const char* left, const char* right) {

    if (left == NULL && right == NULL){
        return 1;
    }

	if (left == NULL || right == NULL){
		return 0;
	}

    if (right != NULL){

        char currLeft = *left;
        char currRight = *right;
        if (currLeft >= 'A' && currLeft <= 'Z'){
            currLeft += ' ';
        }
        if (currRight >= 'A' && currRight <= 'Z'){
            currRight += ' ';
        }

        while (currLeft == currRight){

            if (currLeft != 0 && currRight != 0) {
                    currLeft = *++left;
                    currRight = *++right;

                    if (currLeft >= 'A' && currLeft <= 'Z'){
                        currLeft += ' ';
                    }
                    if (currRight >= 'A' && currRight <= 'Z'){
                        currRight += ' ';
                    }
            }
            else{
                break;
            }

        }

        if (currLeft == 0 && currRight == 0){
            return 1;
        }
    }

    return 0;
}

const float FOUR_NINETY_SIX = 4096.0;
const float TWO_FOURTY_EIGHT = 2048.0;
const float PI = 3.1415927;

int Utils_ArcCos(int val){
	float inp = val;
	float res = acos(inp / FOUR_NINETY_SIX);
	return (res * TWO_FOURTY_EIGHT / PI);
}



// @Ok
// Matching
int Utils_CopyString(const char* src, char* dst, int maxSize)
{
	int total = 0;

	if (*src)
	{
		while (*src){

			if (total >= maxSize)
				break;

			*dst++ = *src++;
			total++;

		}
	}

	print_if_false(total < maxSize, "Dest buffer overflow in Utils_CopyString");
	*dst = 0;
	return total;
}

// @Ok
CBody* Utils_CheckObjectCollision(
		CVector* a1,
		CVector* a2,
		CBody* a3,
		CBody* a4)
{
	CBody *result;

	CVector v9;
	v9.vx = 0;
	v9.vy = 0;
	v9.vz = 0;

	result = reinterpret_cast<CBody*>(M3dColij_LineToSphere(a1, a2, &v9, a3, a4, 4096));

	if (!result)
	{
		gLineInfo.vec_0 = *a1;
		gLineInfo.vec_C = *a2;

		M3dColij_InitLineInfo(&gLineInfo);

		gLineToItemRelated = 1;
		M3dColij_LineToItem(EnvironmentalObjectList, &gLineInfo);
		result = reinterpret_cast<CBody*>(gGetGroundRelated);
		gLineToItemRelated = 0;
	}

	return result;
}

// @SMALLTODO
int Utils_GetGroundHeight(CVector*, int, int, CBody**)
{
	return 0x14052024;
}

// @SMALLTODO
int Utils_LineOfSight(CVector*, CVector*, CVector*, int)
{
	return 0x15052024;
}

int catan(int a1)
{
	 return (atan((double)a1 / 4096.0) * 651.0006103515625);
}

// @Ok
int Utils_CalcAim(CSVector* a1, CVector* a2, CVector* a3)
{
	int x,y,z;
	x = (a3->vx - a2->vx) >> 12;
	y = (a3->vy - a2->vy) >> 12;
	z = (a3->vz - a2->vz) >> 12;

	if (z)
	{
		if (z > 0)
		{
			a1->vy = catan(-((x << 12) / z));
		}
		else
		{
			a1->vy = catan((x << 12) / z);
		}
	}
	else
	{
		if (x > 0)
		{
			a1->vy = -1024;
		}
		else
		{
			a1->vy = 1024;
		}
	}

	int v7 = M3dMaths_SquareRoot0(x*x + z*z);
	if (v7)
	{
		if (y > 0)
		{
			a1->vx = catan((y<<12) / v7);
		}
		else
		{
			a1->vx = -catan(-4096 * y / v7);
		}
	}
	else
	{
		a1->vx = y > 0 ? 1024 : -1024;
	}

	a1->vx &= 0xFFF;
	a1->vy &= 0xFFF;
	a1->vz = 0;
	return v7;
}

static int gRndRelatedOne;
static int gRndRelatedTwo;
static int gRndRelatedThree;

// @Ok
void Utils_InitialRand(int a)
{
	gRndRelatedTwo = 0x12B9B0A1;
	gRndRelatedOne = a;
	gRndRelatedThree = 0xAA2FB3F;
}

// @Ok
int Rnd(int n)
{
	int result; // eax
	gRndRelatedOne = gRndRelatedThree + gRndRelatedOne * gRndRelatedTwo;
	gRndRelatedTwo = (gRndRelatedOne >> 4) + (gRndRelatedOne ^ gRndRelatedTwo);
	result = (n * (unsigned __int16)gRndRelatedOne) >> 16;
	gRndRelatedThree = gRndRelatedThree + (gRndRelatedOne >> 3) - 0x10101010;
	return result;
}

const unsigned int crc32_tab[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,

	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,

	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,

	0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,

	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,

	0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,

	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,

	0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,

	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,

	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,

	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,

	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,

	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,

	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,

	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,

	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,

	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,

	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,

	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,

	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,

	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,

	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,

	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,

	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,

	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,

	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,

	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,

	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,

	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,

	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,

	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,

	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,

	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,

	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,

	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,

	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,

	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,

	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,

	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,

	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,

	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,

	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,

	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

// @Ok
unsigned int Utils_GenerateCRC(const char* buf)
{
	const unsigned char *p = reinterpret_cast<const unsigned char*>(buf);
	unsigned int crc;
	crc = ~0U;

	while (*p)
	{
		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
	}

	return crc;
}

// @Ok
// @Test
int Utils_LinearFilter(
		i32 a1,
		i32 a2,
		i32 delta)
{
	print_if_false(delta > 0, "delta must be greater than zero");

	if (a1 > a2)
	{
		if (a1 - a2 <= delta)
			return a2;

		return a1 - delta;
	}
	else
	{
		if (a2 - a1 <= delta)
		{
			return a1;
		}

		return a1 + delta;
	}

}

// @MEDIUMTODO
void Utils_GetVecFromMagDir(CVector*, int, CSVector*)
{}

i32 DifficultyLevel;
int Utils_GetValueFromDifficultyLevel(int a1, int a2, int a3, int a4)
{
	switch (DifficultyLevel)
	{
		case 0:
			return a1;
		case 1:
			return a2;
		case 2:
			return a3;
		default:
			return a4;
	}
}

// @Ok
int Utils_XZDist(const CVector* a1, const CVector *a2)
{
	int v2 = ((a1->vx - a2->vx) >> 12);
	v2 *= v2;

	int v3 = ((a1->vz - a2->vz) >> 12);
	v3 *= v3;

	return M3dMaths_SquareRoot0(v2 + v3);
}

// @MEDIUMTODO
void Utils_RotateY(CVector*, CVector*, int)
{}