/
m_misc.c
1303 lines (1100 loc) · 33.9 KB
/
m_misc.c
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/**\file m_misc.c
*\section License
* License: GPL
* Online License Link: http://www.gnu.org/licenses/gpl.html
*
*\author Copyright © 2003-2012 Jaakko Keränen <jaakko.keranen@iki.fi>
*\author Copyright © 2006-2012 Daniel Swanson <danij@dengine.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* Miscellanous Routines.
*/
// HEADER FILES ------------------------------------------------------------
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#if defined(WIN32)
# include <direct.h>
# include <io.h>
# include <conio.h>
#endif
#if defined(UNIX)
# include <unistd.h>
# include <string.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include "de_platform.h"
#include "de_base.h"
#include "de_console.h"
#include "de_system.h"
#include "de_filesys.h"
#include "de_graphics.h"
#include "de_refresh.h"
#include "de_misc.h"
#include "de_play.h"
#include "lzss.h"
// MACROS ------------------------------------------------------------------
#define SLOPERANGE 2048
#define SLOPEBITS 11
#define DBITS (FRACBITS-SLOPEBITS)
// TYPES -------------------------------------------------------------------
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
static size_t FileReader(char const* name, char** buffer);
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
extern int tantoangle[SLOPERANGE + 1]; // get from tables.c
// PUBLIC DATA DEFINITIONS -------------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// CODE --------------------------------------------------------------------
void *M_Malloc(size_t size)
{
return malloc(size);
}
void *M_Calloc(size_t size)
{
return calloc(size, 1);
}
void *M_Realloc(void *ptr, size_t size)
{
return realloc(ptr, size);
}
void* M_MemDup(const void* ptr, size_t size)
{
void* copy = M_Malloc(size);
memcpy(copy, ptr, size);
return copy;
}
void M_Free(void *ptr)
{
free(ptr);
}
char* M_SkipWhite(char* str)
{
while(*str && ISSPACE(*str))
str++;
return str;
}
char* M_FindWhite(char* str)
{
while(*str && !ISSPACE(*str))
str++;
return str;
}
void M_StripLeft(char* str)
{
size_t len, num;
if(NULL == str || !str[0]) return;
len = strlen(str);
// Count leading whitespace characters.
num = 0;
while(num < len && isspace(str[num]))
++num;
if(0 == num) return;
// Remove 'num' characters.
memmove(str, str + num, len - num);
str[len] = 0;
}
void M_StripRight(char* str, size_t len)
{
char* end;
int numZeroed = 0;
if(NULL == str || 0 == len) return;
end = str + strlen(str) - 1;
while(end >= str && isspace(*end))
{
end--;
numZeroed++;
}
memset(end + 1, 0, numZeroed);
}
void M_Strip(char* str, size_t len)
{
M_StripLeft(str);
M_StripRight(str, len);
}
char* M_SkipLine(char* str)
{
while(*str && *str != '\n')
str++;
// If the newline was found, skip it, too.
if(*str == '\n')
str++;
return str;
}
char* M_StrCat(char* buf, const char* str, size_t bufSize)
{
return M_StrnCat(buf, str, strlen(str), bufSize);
}
char* M_StrnCat(char* buf, const char* str, size_t nChars, size_t bufSize)
{
int n = nChars;
int destLen = strlen(buf);
if((int)bufSize - destLen - 1 < n)
{
// Cannot copy more than fits in the buffer.
// The 1 is for the null character.
n = bufSize - destLen - 1;
}
if(n <= 0) return buf; // No space left.
return strncat(buf, str, n);
}
char* M_LimitedStrCat(char* buf, const char* str, size_t maxWidth,
char separator, size_t bufLength)
{
boolean isEmpty = !buf[0];
size_t length;
// How long is this name?
length = MIN_OF(maxWidth, strlen(str));
// A separator is included if this is not the first name.
if(separator && !isEmpty)
++length;
// Does it fit?
if(strlen(buf) + length < bufLength)
{
if(separator && !isEmpty)
{
char sepBuf[2];
sepBuf[0] = separator;
sepBuf[1] = 0;
strcat(buf, sepBuf);
}
strncat(buf, str, length);
}
return buf;
}
void M_ReadLine(char* buffer, size_t len, DFile* file)
{
size_t p;
char ch;
boolean isDone;
memset(buffer, 0, len);
p = 0;
isDone = false;
while(p < len - 1 && !isDone) // Make the last null stay there.
{
ch = DFile_GetC(file);
if(ch != '\r')
{
if(DFile_AtEnd(file) || ch == '\n')
isDone = true;
else
buffer[p++] = ch;
}
}
}
boolean M_IsComment(const char* buffer)
{
int i = 0;
while(isspace((unsigned char) buffer[i]) && buffer[i])
i++;
if(buffer[i] == '#')
return true;
return false;
}
/// \note Part of the Doomsday public API
boolean M_IsStringValidInt(const char* str)
{
size_t i, len;
const char* c;
boolean isBad;
if(!str)
return false;
len = strlen(str);
if(len == 0)
return false;
for(i = 0, c = str, isBad = false; i < len && !isBad; ++i, c++)
{
if(i != 0 && *c == '-')
isBad = true; // sign is in the wrong place.
else if(*c < '0' || *c > '9')
isBad = true; // non-numeric character.
}
return !isBad;
}
/// \note Part of the Doomsday public API
boolean M_IsStringValidByte(const char* str)
{
if(M_IsStringValidInt(str))
{
int val = atoi(str);
if(!(val < 0 || val > 255))
return true;
}
return false;
}
/// \note Part of the Doomsday public API
boolean M_IsStringValidFloat(const char* str)
{
size_t i, len;
const char* c;
boolean isBad, foundDP = false;
if(!str)
return false;
len = strlen(str);
if(len == 0)
return false;
for(i = 0, c = str, isBad = false; i < len && !isBad; ++i, c++)
{
if(i != 0 && *c == '-')
isBad = true; // sign is in the wrong place.
else if(*c == '.')
{
if(foundDP)
isBad = true; // multiple decimal places??
else
foundDP = true;
}
else if(*c < '0' || *c > '9')
isBad = true; // other non-numeric character.
}
return !isBad;
}
// This is the new flat distribution table
static unsigned char rngTable[256] = {
201, 1, 243, 19, 18, 42, 183, 203, 101, 123, 154, 137, 34, 118, 10, 216,
135, 246, 0, 107, 133, 229, 35, 113, 177, 211, 110, 17, 139, 84, 251, 235,
182, 166, 161, 230, 143, 91, 24, 81, 22, 94, 7, 51, 232, 104, 122, 248,
175, 138, 127, 171, 222, 213, 44, 16, 9, 33, 88, 102, 170, 150, 136, 114,
62, 3, 142, 237, 6, 252, 249, 56, 74, 30, 13, 21, 180, 199, 32, 132,
187, 234, 78, 210, 46, 131, 197, 8, 206, 244, 73, 4, 236, 178, 195, 70,
121, 97, 167, 217, 103, 40, 247, 186, 105, 39, 95, 163, 99, 149, 253, 29,
119, 83, 254, 26, 202, 65, 130, 155, 60, 64, 184, 106, 221, 93, 164, 196,
112, 108, 179, 141, 54, 109, 11, 126, 75, 165, 191, 227, 87, 225, 156, 15,
98, 162, 116, 79, 169, 140, 190, 205, 168, 194, 41, 250, 27, 20, 14, 241,
50, 214, 72, 192, 220, 233, 67, 148, 96, 185, 176, 181, 215, 207, 172, 85,
89, 90, 209, 128, 124, 2, 55, 173, 66, 152, 47, 129, 59, 43, 159, 240,
239, 12, 189, 212, 144, 28, 200, 77, 219, 198, 134, 228, 45, 92, 125, 151,
5, 53, 255, 52, 68, 245, 160, 158, 61, 86, 58, 82, 117, 37, 242, 145,
69, 188, 115, 76, 63, 100, 49, 111, 153, 80, 38, 57, 174, 224, 71, 231,
23, 25, 48, 218, 120, 147, 208, 36, 226, 223, 193, 238, 157, 204, 146, 31
};
static int rngIndex = 0, rngIndex2 = 0;
byte RNG_RandByte(void)
{
if(rngIndex > 255)
{
rngIndex = 0;
rngIndex2++;
}
return rngTable[(++rngIndex) & 0xff] ^ rngTable[rngIndex2 & 0xff];
}
float RNG_RandFloat(void)
{
return (RNG_RandByte() | (RNG_RandByte() << 8)) / 65535.0f;
}
void RNG_Reset(void)
{
rngIndex = 0, rngIndex2 = 0;
}
int M_RatioReduce(int* numerator, int* denominator)
{
int n, d, temp;
if(!numerator || !denominator)
{
#if _DEBUG
Con_Message("Warning: M_RatioReduce: Invalid arguments, returning 1:1.\n");
#endif
return 1;
}
if(*numerator == *denominator) return 1; // 1:1
n = abs(*numerator);
d = abs(*denominator);
// Ensure numerator is larger.
if(n < d)
{
temp = n;
n = d;
d = temp;
}
// Reduce to the common divisor.
while(d != 0)
{
temp = n;
n = d;
d = temp % d;
}
// Apply divisor.
*numerator /= n;
*denominator /= n;
return n;
}
/**
* Finds the power of 2 that is equal to or greater than the specified
* number.
*/
int M_CeilPow2(int num)
{
int cumul;
for(cumul = 1; num > cumul; cumul <<= 1);
return cumul;
}
/**
* Finds the power of 2 that is less than or equal to the specified number.
*/
int M_FloorPow2(int num)
{
int fl = M_CeilPow2(num);
if(fl > num)
fl >>= 1;
return fl;
}
/**
* Finds the power of 2 that is nearest the specified number. In ambiguous
* cases, the smaller number is returned.
*/
int M_RoundPow2(int num)
{
int cp2 = M_CeilPow2(num), fp2 = M_FloorPow2(num);
return ((cp2 - num >= num - fp2) ? fp2 : cp2);
}
/**
* Weighted rounding. Weight determines the point where the number is still
* rounded down (0..1).
*/
int M_WeightPow2(int num, float weight)
{
int fp2 = M_FloorPow2(num);
float frac = (num - fp2) / (float) fp2;
if(frac <= weight)
return fp2;
else
return (fp2 << 1);
}
/**
* @return value mod length (length > 0).
*/
float M_CycleIntoRange(float value, float length)
{
if(value < 0)
{
return value - ((int) (value / length) - 1) * length;
}
if(value > length)
{
return value - ((int) (value / length)) * length;
}
return value;
}
double M_DirectionToAngleXY(double dx, double dy)
{
double angle;
if(dx == 0)
return (dy > 0? 90.0 : 270.0);
angle = atan2((double) dy, (double) dx) * 180.0 / PI_D;
if(angle < 0)
angle += 360.0;
return angle;
}
double M_DirectionToAngle(double const direction[])
{
return M_DirectionToAngleXY(direction[VX], direction[VY]);
}
slopetype_t M_SlopeTypeXY(double dx, double dy)
{
if(FEQUAL(dx, 0))
{
return ST_VERTICAL;
}
else if(FEQUAL(dy, 0))
{
return ST_HORIZONTAL;
}
else if(dy / dx > 0)
{
return ST_POSITIVE;
}
else
{
return ST_NEGATIVE;
}
}
slopetype_t M_SlopeType(double const direction[])
{
return M_SlopeTypeXY(direction[VX], direction[VY]);
}
int M_NumDigits(int value)
{
return floor(log10(abs(value))) + 1;
}
double M_TriangleArea(double const v1[], double const v2[], double const v3[])
{
double a[2], b[2];
double area;
V2d_Subtract(a, v2, v1);
V2d_Subtract(b, v3, v1);
area = (a[VX] * b[VY] - b[VX] * a[VY]) / 2;
if(area < 0)
return -area;
return area;
}
/**
* First yaw, then pitch. Two consecutive 2D rotations.
* Probably could be done a bit more efficiently.
*/
void M_RotateVector(float vec[3], float degYaw, float degPitch)
{
float radYaw = degYaw / 180 * PI, radPitch = degPitch / 180 * PI;
float Cos, Sin, res[3];
// Yaw.
if(radYaw != 0)
{
Cos = cos(radYaw);
Sin = sin(radYaw);
res[VX] = vec[VX] * Cos + vec[VY] * Sin;
res[VY] = vec[VX] * -Sin + vec[VY] * Cos;
vec[VX] = res[VX];
vec[VY] = res[VY];
}
// Pitch.
if(radPitch != 0)
{
Cos = cos(radPitch);
Sin = sin(radPitch);
res[VZ] = vec[VZ] * Cos + vec[VX] * Sin;
res[VX] = vec[VZ] * -Sin + vec[VX] * Cos;
vec[VZ] = res[VZ];
vec[VX] = res[VX];
}
}
int M_BoxOnLineSide(const AABoxd* box, double const linePoint[], double const lineDirection[])
{
int a, b;
switch(M_SlopeType(lineDirection))
{
default: // Shut up compiler.
case ST_HORIZONTAL:
a = box->maxY > linePoint[VY]? -1 : 1;
b = box->minY > linePoint[VY]? -1 : 1;
if(lineDirection[VX] < 0)
{
a = -a;
b = -b;
}
break;
case ST_VERTICAL:
a = box->maxX < linePoint[VX]? -1 : 1;
b = box->minX < linePoint[VX]? -1 : 1;
if(lineDirection[VY] < 0)
{
a = -a;
b = -b;
}
break;
case ST_POSITIVE: {
double topLeft[2] = { box->minX, box->maxY };
double bottomRight[2] = { box->maxX, box->minY };
a = V2d_PointOnLineSide(topLeft, linePoint, lineDirection) < 0 ? -1 : 1;
b = V2d_PointOnLineSide(bottomRight, linePoint, lineDirection) < 0 ? -1 : 1;
break; }
case ST_NEGATIVE:
a = V2d_PointOnLineSide(box->max, linePoint, lineDirection) < 0 ? -1 : 1;
b = V2d_PointOnLineSide(box->min, linePoint, lineDirection) < 0 ? -1 : 1;
break;
}
if(a == b) return a;
return 0;
}
int M_BoxOnLineSide2(const AABoxd* box, double const linePoint[], double const lineDirection[],
double linePerp, double lineLength, double epsilon)
{
#define NORMALIZE(v) ((v) < 0? -1 : (v) > 0? 1 : 0)
double delta;
int a, b;
switch(M_SlopeType(lineDirection))
{
default: // Shut up compiler.
case ST_HORIZONTAL:
a = box->maxY > linePoint[VY]? -1 : 1;
b = box->minY > linePoint[VY]? -1 : 1;
if(lineDirection[VX] < 0)
{
a = -a;
b = -b;
}
break;
case ST_VERTICAL:
a = box->maxX < linePoint[VX]? -1 : 1;
b = box->minX < linePoint[VX]? -1 : 1;
if(lineDirection[VY] < 0)
{
a = -a;
b = -b;
}
break;
case ST_POSITIVE: {
double topLeft[2] = { box->minX, box->maxY };
double bottomRight[2] = { box->maxX, box->minY };
delta = V2d_PointOnLineSide2(topLeft, lineDirection, linePerp, lineLength, epsilon);
a = NORMALIZE(delta);
delta = V2d_PointOnLineSide2(bottomRight, lineDirection, linePerp, lineLength, epsilon);
b = NORMALIZE(delta);
break; }
case ST_NEGATIVE:
delta = V2d_PointOnLineSide2(box->max, lineDirection, linePerp, lineLength, epsilon);
a = NORMALIZE(delta);
delta = V2d_PointOnLineSide2(box->min, lineDirection, linePerp, lineLength, epsilon);
b = NORMALIZE(delta);
break;
}
if(a == b) return a;
return 0;
#undef NORMALIZE
}
float M_BoundingBoxDiff(const float in[4], const float out[4])
{
return in[BOXLEFT] - out[BOXLEFT] +
in[BOXBOTTOM] - out[BOXBOTTOM] +
out[BOXRIGHT] - in[BOXRIGHT] +
out[BOXTOP] - in[BOXTOP];
}
void M_ClearBox(fixed_t *box)
{
box[BOXTOP] = box[BOXRIGHT] = DDMININT;
box[BOXBOTTOM] = box[BOXLEFT] = DDMAXINT;
}
void M_AddToBox(fixed_t *box, fixed_t x, fixed_t y)
{
if(x < box[BOXLEFT])
box[BOXLEFT] = x;
else if(x > box[BOXRIGHT])
box[BOXRIGHT] = x;
if(y < box[BOXBOTTOM])
box[BOXBOTTOM] = y;
else if(y > box[BOXTOP])
box[BOXTOP] = y;
}
void M_JoinBoxes(float bbox[4], const float other[4])
{
if(other[BOXLEFT] < bbox[BOXLEFT])
bbox[BOXLEFT] = other[BOXLEFT];
if(other[BOXRIGHT] > bbox[BOXRIGHT])
bbox[BOXRIGHT] = other[BOXRIGHT];
if(other[BOXTOP] > bbox[BOXTOP])
bbox[BOXTOP] = other[BOXTOP];
if(other[BOXBOTTOM] < bbox[BOXBOTTOM])
bbox[BOXBOTTOM] = other[BOXBOTTOM];
}
void M_CopyBox(fixed_t dest[4], const fixed_t src[4])
{
dest[BOXLEFT] = src[BOXLEFT];
dest[BOXRIGHT] = src[BOXRIGHT];
dest[BOXBOTTOM] = src[BOXBOTTOM];
dest[BOXTOP] = src[BOXTOP];
}
#ifndef O_BINARY
# define O_BINARY 0
#endif
boolean M_WriteFile(const char* name, const char* source, size_t length)
{
int handle = open(name, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
size_t count;
if(handle == -1)
return false;
count = write(handle, source, length);
close(handle);
return (count >= length);
}
/**
* Read a file into a buffer allocated using M_Malloc().
*/
size_t M_ReadFile(const char* name, char** buffer)
{
return FileReader(name, buffer);
}
static size_t FileReader(const char* name, char** buffer)
{
struct stat fileinfo;
char* buf = NULL;
size_t length = 0;
int handle;
// First try with LZSS.
{ LZFILE* file = lzOpen((char*) name, "rp");
if(NULL != file)
{
#define BSIZE 1024
char readBuf[BSIZE];
// Read 1kb pieces until file ends.
while(!lzEOF(file))
{
size_t bytesRead = lzRead(readBuf, BSIZE, file);
char* newBuf;
// Allocate more memory.
newBuf = (char*) Z_Malloc(length + bytesRead, PU_APPSTATIC, 0);
if(NULL == newBuf)
Con_Error("FileReader: realloc failed.");
if(NULL != buf)
{
memcpy(newBuf, buf, length);
Z_Free(buf);
}
buf = newBuf;
// Copy new data to buffer.
memcpy(buf + length, readBuf, bytesRead);
length += bytesRead;
}
lzClose(file);
*buffer = (char*)buf;
return length;
#undef BSIZE
}}
handle = open(name, O_RDONLY | O_BINARY, 0666);
if(handle == -1)
{
#if _DEBUG
Con_Message("Warning:FileReader: Failed opening \"%s\" for reading.\n", name);
#endif
return length;
}
if(-1 == fstat(handle, &fileinfo))
{
Con_Error("FileReader: Couldn't read file %s\n", name);
}
length = fileinfo.st_size;
buf = Z_Malloc(length, PU_APPSTATIC, 0);
if(buf == NULL)
{
Con_Error("FileReader: Failed on allocation of %lu bytes for file \"%s\".\n",
(unsigned long) length, name);
}
{ size_t bytesRead = read(handle, buf, length);
close(handle);
if(bytesRead < length)
{
Con_Error("FileReader: Couldn't read file \"%s\".\n", name);
}}
*buffer = buf;
return length;
}
/**
* Change string to uppercase.
*/
void M_ForceUppercase(char *text)
{
char c;
while((c = *text) != 0)
{
if(c >= 'a' && c <= 'z')
{
*text++ = c - ('a' - 'A');
}
else
{
text++;
}
}
}
void M_WriteCommented(FILE *file, const char* text)
{
char* buff = M_Malloc(strlen(text) + 1), *line;
strcpy(buff, text);
line = strtok(buff, "\n");
while(line)
{
fprintf(file, "# %s\n", line);
line = strtok(NULL, "\n");
}
M_Free(buff);
}
/**
* The caller must provide the opening and closing quotes.
*/
void M_WriteTextEsc(FILE* file, const char* text)
{
if(!file || !text)
{
Con_Error("Attempted M_WriteTextEsc with invalid reference (%s==0).", !file? "file":"text");
return; // Unreachable.
}
{ size_t i;
for(i = 0; i < strlen(text) && text[i]; ++i)
{
if(text[i] == '"' || text[i] == '\\')
fprintf(file, "\\");
fprintf(file, "%c", text[i]);
}}
}
static int slopeDiv(unsigned num, unsigned den)
{
uint ans;
if(den < 512)
return SLOPERANGE;
ans = (num << 3) / (den >> 8);
return ans <= SLOPERANGE ? ans : SLOPERANGE;
}
angle_t M_PointToAngle(double const point[])
{
fixed_t pos[2];
pos[VX] = FLT2FIX(point[VX]);
pos[VY] = FLT2FIX(point[VY]);
if(pos[VX] == 0 && pos[VY] == 0)
return 0;
if(pos[VX] >= 0)
{
// x >=0
if(pos[VY] >= 0)
{
// y>= 0
if(pos[VX] > pos[VY])
return tantoangle[slopeDiv(pos[VY], pos[VX])]; // octant 0
return ANG90 - 1 - tantoangle[slopeDiv(pos[VX], pos[VY])]; // octant 1
}
// y<0
pos[VY] = -pos[VY];
if(pos[VX] > pos[VY])
return -tantoangle[slopeDiv(pos[VY], pos[VX])]; // octant 8
return ANG270 + tantoangle[slopeDiv(pos[VX], pos[VY])]; // octant 7
}
// x<0
pos[VX] = -pos[VX];
if(pos[VY] >= 0)
{
// y>= 0
if(pos[VX] > pos[VY])
return ANG180 - 1 - tantoangle[slopeDiv(pos[VY], pos[VX])]; // octant 3
return ANG90 + tantoangle[slopeDiv(pos[VX], pos[VY])]; // octant 2
}
// y<0
pos[VY] = -pos[VY];
if(pos[VX] > pos[VY])
return ANG180 + tantoangle[slopeDiv(pos[VY], pos[VX])]; // octant 4
return ANG270 - 1 - tantoangle[slopeDiv(pos[VX], pos[VY])]; // octant 5
}
angle_t M_PointXYToAngle(double x, double y)
{
double point[2] = { x, y };
return M_PointToAngle(point);
}
angle_t M_PointToAngle2(double const a[], double const b[])
{
double delta[2] = { b[VX] - a[VX], b[VY] - a[VY] };
return M_PointToAngle(delta);
}
angle_t M_PointXYToAngle2(double aX, double aY, double bX, double bY)
{
double a[2] = { aX, aY };
double b[2] = { bX, bY };
return M_PointToAngle2(a, b);
}
double M_PointDistance(double const a[], double const b[])
{
double delta[2];
uint angle;
delta[VX] = fabs(b[VX] - a[VX]);
delta[VY] = fabs(b[VY] - a[VY]);
if(delta[VY] > delta[VX])
{
double temp = delta[VX];
delta[VX] = delta[VY];
delta[VY] = temp;
}
angle = (tantoangle[FLT2FIX(delta[VY] / delta[VX]) >> DBITS] + ANG90) >> ANGLETOFINESHIFT;
return delta[VX] / FIX2FLT(finesine[angle]); // Use as cosine
}
double M_PointXYDistance(double aX, double aY, double bX, double bY)
{
double a[2] = { aX, aY };
double b[2] = { bX, bY };
return M_PointDistance(a, b);
}
double M_ApproxDistance(double dx, double dy)
{
dx = fabs(dx);
dy = fabs(dy);
if(dx < dy)
return dx + dy - dx / 2;
return dx + dy - dy / 2;
}
float M_ApproxDistancef(float dx, float dy)
{
dx = fabs(dx);
dy = fabs(dy);
if(dx < dy)
return dx + dy - dx / 2;
return dx + dy - dy / 2;
}