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am_map.c
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am_map.c
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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: am_map.c,v 1.24 1998/05/10 12:05:24 jim Exp $
//
// Copyright (C) 1999 by
// id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
//
// 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., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// the automap code
//
//-----------------------------------------------------------------------------
#include "doomstat.h"
#include "st_stuff.h"
#include "r_main.h"
#include "p_setup.h"
#include "p_maputl.h"
#include "w_wad.h"
#include "v_video.h"
#include "p_spec.h"
#include "am_map.h"
#include "dstrings.h"
#include "d_deh.h" // Ty 03/27/98 - externalizations
//jff 1/7/98 default automap colors added
int mapcolor_back; // map background
int mapcolor_grid; // grid lines color
int mapcolor_wall; // normal 1s wall color
int mapcolor_fchg; // line at floor height change color
int mapcolor_cchg; // line at ceiling height change color
int mapcolor_clsd; // line at sector with floor=ceiling color
int mapcolor_rkey; // red key color
int mapcolor_bkey; // blue key color
int mapcolor_ykey; // yellow key color
int mapcolor_rdor; // red door color (diff from keys to allow option)
int mapcolor_bdor; // blue door color (of enabling one but not other )
int mapcolor_ydor; // yellow door color
int mapcolor_tele; // teleporter line color
int mapcolor_secr; // secret sector boundary color
int mapcolor_exit; // jff 4/23/98 add exit line color
int mapcolor_unsn; // computer map unseen line color
int mapcolor_flat; // line with no floor/ceiling changes
int mapcolor_sprt; // general sprite color
int mapcolor_hair; // crosshair color
int mapcolor_sngl; // single player arrow color
int mapcolor_plyr[4]; // colors for player arrows in multiplayer
int mapcolor_frnd; // colors for friends of player
//jff 3/9/98 add option to not show secret sectors until entered
int map_secret_after;
//jff 4/3/98 add symbols for "no-color" for disable and "black color" for black
#define NC 0
#define BC 247
// drawing stuff
#define FB 0
// automap key binding
extern int key_map_right; // phares
extern int key_map_left; // |
extern int key_map_up; // V
extern int key_map_down;
extern int key_map_zoomin;
extern int key_map_zoomout;
extern int key_map;
extern int key_map_gobig;
extern int key_map_follow;
extern int key_map_mark; // ^
extern int key_map_clear; // |
extern int key_map_grid; // phares
// [FG] automap joystick button
extern int joybautomap;
// scale on entry
#define INITSCALEMTOF (int)(.2*FRACUNIT)
// how much the automap moves window per tic in frame-buffer coordinates
// moves 140 pixels in 1 second
#define F_PANINC 4
// how much zoom-in per tic
// goes to 2x in 1 second
#define M_ZOOMIN ((int) (1.02*FRACUNIT))
// how much zoom-out per tic
// pulls out to 0.5x in 1 second
#define M_ZOOMOUT ((int) (FRACUNIT/1.02))
// translates between frame-buffer and map distances
// [FG] fix int overflow that causes map and grid lines to disappear
#define FTOM(x) ((((int64_t)(x)<<16)*scale_ftom)>>16)
#define MTOF(x) ((((int64_t)(x)*scale_mtof)>>16)>>16)
// translates between frame-buffer and map coordinates
#define CXMTOF(x) (f_x + MTOF((x)-m_x))
#define CYMTOF(y) (f_y + (f_h - MTOF((y)-m_y)))
typedef struct
{
int x, y;
} fpoint_t;
typedef struct
{
fpoint_t a, b;
} fline_t;
typedef struct
{
mpoint_t a, b;
} mline_t;
typedef struct
{
fixed_t slp, islp;
} islope_t;
//
// The vector graphics for the automap.
// A line drawing of the player pointing right,
// starting from the middle.
//
#define R ((8*PLAYERRADIUS)/7)
mline_t player_arrow[] =
{
{ { -R+R/8, 0 }, { R, 0 } }, // -----
{ { R, 0 }, { R-R/2, R/4 } }, // ----->
{ { R, 0 }, { R-R/2, -R/4 } },
{ { -R+R/8, 0 }, { -R-R/8, R/4 } }, // >---->
{ { -R+R/8, 0 }, { -R-R/8, -R/4 } },
{ { -R+3*R/8, 0 }, { -R+R/8, R/4 } }, // >>--->
{ { -R+3*R/8, 0 }, { -R+R/8, -R/4 } }
};
#undef R
#define NUMPLYRLINES (sizeof(player_arrow)/sizeof(mline_t))
#define R ((8*PLAYERRADIUS)/7)
mline_t cheat_player_arrow[] =
{ // killough 3/22/98: He's alive, Jim :)
{ { -R+R/8, 0 }, { R, 0 } }, // -----
{ { R, 0 }, { R-R/2, R/4 } }, // ----->
{ { R, 0 }, { R-R/2, -R/4 } },
{ { -R+R/8, 0 }, { -R-R/8, R/4 } }, // >---->
{ { -R+R/8, 0 }, { -R-R/8, -R/4 } },
{ { -R+3*R/8, 0 }, { -R+R/8, R/4 } }, // >>--->
{ { -R+3*R/8, 0 }, { -R+R/8, -R/4 } },
{ { -R/10-R/6, R/4}, {-R/10-R/6, -R/4} }, // J
{ { -R/10-R/6, -R/4}, {-R/10-R/6-R/8, -R/4} },
{ { -R/10-R/6-R/8, -R/4}, {-R/10-R/6-R/8, -R/8} },
{ { -R/10, R/4}, {-R/10, -R/4}}, // F
{ { -R/10, R/4}, {-R/10+R/8, R/4}},
{ { -R/10+R/4, R/4}, {-R/10+R/4, -R/4}}, // F
{ { -R/10+R/4, R/4}, {-R/10+R/4+R/8, R/4}},
};
#undef R
#define NUMCHEATPLYRLINES (sizeof(cheat_player_arrow)/sizeof(mline_t))
#define R (FRACUNIT)
#define np867R (int)(-.867*R)
#define p867R (int)(.867*R)
#define np5R (int)(-.5*R)
#define p5R (int)(.5*R)
mline_t triangle_guy[] =
{
{ { np867R, np5R }, { p867R, np5R } },
{ { p867R, np5R }, { 0, R } },
{ { 0, R }, { np867R, np5R } }
};
#undef R
#undef np867R
#undef p867R
#undef np5R
#undef p5R
#define NUMTRIANGLEGUYLINES (sizeof(triangle_guy)/sizeof(mline_t))
//jff 1/5/98 new symbol for keys on automap
#define R (FRACUNIT)
mline_t cross_mark[] =
{
{ { -R, 0 }, { R, 0} },
{ { 0, -R }, { 0, R } },
};
#undef R
#define NUMCROSSMARKLINES (sizeof(cross_mark)/sizeof(mline_t))
//jff 1/5/98 end of new symbol
#define R (FRACUNIT)
#define np5R (int)(-.5*R)
#define np7R (int)(-.7*R)
#define p7R (int)(.7*R)
mline_t thintriangle_guy[] =
{
{ { np5R, np7R }, { R, 0 } },
{ { R, 0 }, { np5R, p7R } },
{ { np5R, p7R }, { np5R, np7R } }
};
#undef R
#define NUMTHINTRIANGLEGUYLINES (sizeof(thintriangle_guy)/sizeof(mline_t))
int ddt_cheating = 0; // killough 2/7/98: make global, rename to ddt_*
int automap_grid = 0;
boolean automapactive = false;
// location of window on screen
static int f_x;
static int f_y;
// size of window on screen
static int f_w;
static int f_h;
static int lightlev; // used for funky strobing effect
static byte* fb; // pseudo-frame buffer
static int amclock;
static mpoint_t m_paninc; // how far the window pans each tic (map coords)
static fixed_t mtof_zoommul; // how far the window zooms each tic (map coords)
static fixed_t ftom_zoommul; // how far the window zooms each tic (fb coords)
static int64_t m_x, m_y; // LL x,y window location on the map (map coords)
static int64_t m_x2, m_y2; // UR x,y window location on the map (map coords)
//
// width/height of window on map (map coords)
//
static int64_t m_w;
static int64_t m_h;
// based on level size
static fixed_t min_x;
static fixed_t min_y;
static fixed_t max_x;
static fixed_t max_y;
static fixed_t max_w; // max_x-min_x,
static fixed_t max_h; // max_y-min_y
// based on player size
static fixed_t min_w;
static fixed_t min_h;
static fixed_t min_scale_mtof; // used to tell when to stop zooming out
static fixed_t max_scale_mtof; // used to tell when to stop zooming in
// old stuff for recovery later
static int64_t old_m_w, old_m_h;
static int64_t old_m_x, old_m_y;
// old location used by the Follower routine
static mpoint_t f_oldloc;
// used by MTOF to scale from map-to-frame-buffer coords
static fixed_t scale_mtof = INITSCALEMTOF;
// used by FTOM to scale from frame-buffer-to-map coords (=1/scale_mtof)
static fixed_t scale_ftom;
static player_t *plr; // the player represented by an arrow
static patch_t *marknums[10]; // numbers used for marking by the automap
// killough 2/22/98: Remove limit on automap marks,
// and make variables external for use in savegames.
mpoint_t *markpoints = NULL; // where the points are
int markpointnum = 0; // next point to be assigned (also number of points now)
int markpointnum_max = 0; // killough 2/22/98
int followplayer = 1; // specifies whether to follow the player around
static boolean stopped = true;
//
// AM_getIslope()
//
// Calculates the slope and slope according to the x-axis of a line
// segment in map coordinates (with the upright y-axis n' all) so
// that it can be used with the brain-dead drawing stuff.
//
// Passed the line slope is desired for and an islope_t structure for return
// Returns nothing
//
void AM_getIslope
( mline_t* ml,
islope_t* is )
{
int dx, dy;
dy = ml->a.y - ml->b.y;
dx = ml->b.x - ml->a.x;
if (!dy)
is->islp = (dx<0?-D_MAXINT:D_MAXINT);
else
is->islp = FixedDiv(dx, dy);
if (!dx)
is->slp = (dy<0?-D_MAXINT:D_MAXINT);
else
is->slp = FixedDiv(dy, dx);
}
//
// AM_activateNewScale()
//
// Changes the map scale after zooming or translating
//
// Passed nothing, returns nothing
//
void AM_activateNewScale(void)
{
m_x += m_w/2;
m_y += m_h/2;
m_w = FTOM(f_w);
m_h = FTOM(f_h);
m_x -= m_w/2;
m_y -= m_h/2;
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
}
//
// AM_saveScaleAndLoc()
//
// Saves the current center and zoom
// Affects the variables that remember old scale and loc
//
// Passed nothing, returns nothing
//
void AM_saveScaleAndLoc(void)
{
old_m_x = m_x;
old_m_y = m_y;
old_m_w = m_w;
old_m_h = m_h;
}
//
// AM_restoreScaleAndLoc()
//
// restores the center and zoom from locally saved values
// Affects global variables for location and scale
//
// Passed nothing, returns nothing
//
void AM_restoreScaleAndLoc(void)
{
m_w = old_m_w;
m_h = old_m_h;
if (!followplayer)
{
m_x = old_m_x;
m_y = old_m_y;
}
else
{
m_x = plr->mo->x - m_w/2;
m_y = plr->mo->y - m_h/2;
}
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
// Change the scaling multipliers
scale_mtof = FixedDiv(f_w<<FRACBITS, m_w);
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
}
//
// AM_addMark()
//
// Adds a marker at the current location
// Affects global variables for marked points
//
// Passed nothing, returns nothing
//
void AM_addMark(void)
{
// killough 2/22/98:
// remove limit on automap marks
if (markpointnum >= markpointnum_max)
markpoints = realloc(markpoints,
(markpointnum_max = markpointnum_max ?
markpointnum_max*2 : 16) * sizeof(*markpoints));
markpoints[markpointnum].x = m_x + m_w/2;
markpoints[markpointnum].y = m_y + m_h/2;
markpointnum++;
}
//
// AM_findMinMaxBoundaries()
//
// Determines bounding box of all vertices,
// sets global variables controlling zoom range.
//
// Passed nothing, returns nothing
//
void AM_findMinMaxBoundaries(void)
{
int i;
fixed_t a;
fixed_t b;
min_x = min_y = D_MAXINT;
max_x = max_y = -D_MAXINT;
for (i=0;i<numvertexes;i++)
{
if (vertexes[i].x < min_x)
min_x = vertexes[i].x;
else if (vertexes[i].x > max_x)
max_x = vertexes[i].x;
if (vertexes[i].y < min_y)
min_y = vertexes[i].y;
else if (vertexes[i].y > max_y)
max_y = vertexes[i].y;
}
// [FG] cope with huge level dimensions which span the entire INT range
max_w = max_x/2 - min_x/2;
max_h = max_y/2 - min_y/2;
min_w = 2*PLAYERRADIUS; // const? never changed?
min_h = 2*PLAYERRADIUS;
a = FixedDiv(f_w<<FRACBITS, max_w);
b = FixedDiv(f_h<<FRACBITS, max_h);
min_scale_mtof = a < b ? a/2 : b/2;
max_scale_mtof = FixedDiv(f_h<<FRACBITS, 2*PLAYERRADIUS);
}
//
// AM_changeWindowLoc()
//
// Moves the map window by the global variables m_paninc.x, m_paninc.y
//
// Passed nothing, returns nothing
//
void AM_changeWindowLoc(void)
{
if (m_paninc.x || m_paninc.y)
{
followplayer = 0;
f_oldloc.x = D_MAXINT;
}
m_x += m_paninc.x;
m_y += m_paninc.y;
if (m_x + m_w/2 > max_x)
m_x = max_x - m_w/2;
else if (m_x + m_w/2 < min_x)
m_x = min_x - m_w/2;
if (m_y + m_h/2 > max_y)
m_y = max_y - m_h/2;
else if (m_y + m_h/2 < min_y)
m_y = min_y - m_h/2;
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
}
//
// AM_initVariables()
//
// Initialize the variables for the automap
//
// Affects the automap global variables
// Status bar is notified that the automap has been entered
// Passed nothing, returns nothing
//
void AM_initVariables(void)
{
int pnum;
static event_t st_notify = { ev_keyup, AM_MSGENTERED };
automapactive = true;
fb = screens[0];
f_oldloc.x = D_MAXINT;
amclock = 0;
lightlev = 0;
m_paninc.x = m_paninc.y = 0;
ftom_zoommul = FRACUNIT;
mtof_zoommul = FRACUNIT;
m_w = FTOM(f_w);
m_h = FTOM(f_h);
// find player to center on initially
if (!playeringame[pnum = consoleplayer])
for (pnum=0;pnum<MAXPLAYERS;pnum++)
if (playeringame[pnum])
break;
plr = &players[pnum];
m_x = plr->mo->x - m_w/2;
m_y = plr->mo->y - m_h/2;
AM_changeWindowLoc();
// for saving & restoring
old_m_x = m_x;
old_m_y = m_y;
old_m_w = m_w;
old_m_h = m_h;
// inform the status bar of the change
ST_Responder(&st_notify);
}
//
// AM_loadPics()
//
// Load the patches for the mark numbers
//
// Sets the marknums[i] variables to the patches for each digit
// Passed nothing, returns nothing;
//
void AM_loadPics(void)
{
int i;
char namebuf[9];
for (i=0;i<10;i++)
{
sprintf(namebuf, "AMMNUM%d", i);
marknums[i] = W_CacheLumpName(namebuf, PU_STATIC);
}
}
//
// AM_unloadPics()
//
// Makes the mark patches purgable
//
// Passed nothing, returns nothing
//
void AM_unloadPics(void)
{
int i;
for (i=0;i<10;i++)
Z_ChangeTag(marknums[i], PU_CACHE);
}
//
// AM_clearMarks()
//
// Sets the number of marks to 0, thereby clearing them from the display
//
// Affects the global variable markpointnum
// Passed nothing, returns nothing
//
void AM_clearMarks(void)
{
markpointnum = 0;
}
//
// AM_LevelInit()
//
// Initialize the automap at the start of a new level
// should be called at the start of every level
//
// Passed nothing, returns nothing
// Affects automap's global variables
//
void AM_LevelInit(void)
{
f_x = f_y = 0;
// killough 2/7/98: get rid of finit_ vars
// to allow runtime setting of width/height
//
// killough 11/98: ... finally add hires support :)
f_w = (SCREENWIDTH) << hires;
f_h = (SCREENHEIGHT-ST_HEIGHT) << hires;
AM_findMinMaxBoundaries();
scale_mtof = FixedDiv(min_scale_mtof, (int) (0.7*FRACUNIT));
if (scale_mtof > max_scale_mtof)
scale_mtof = min_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
}
//
// AM_Stop()
//
// Cease automap operations, unload patches, notify status bar
//
// Passed nothing, returns nothing
//
void AM_Stop (void)
{
static event_t st_notify = { 0, ev_keyup, AM_MSGEXITED };
AM_unloadPics();
automapactive = false;
ST_Responder(&st_notify);
stopped = true;
}
//
// AM_Start()
//
// Start up automap operations,
// if a new level, or game start, (re)initialize level variables
// init map variables
// load mark patches
//
// Passed nothing, returns nothing
//
void AM_Start()
{
static int lastlevel = -1, lastepisode = -1, last_hires = -1;
if (!stopped)
AM_Stop();
stopped = false;
if (lastlevel != gamemap || lastepisode != gameepisode || hires!=last_hires)
{
last_hires = hires; // killough 11/98
AM_LevelInit();
lastlevel = gamemap;
lastepisode = gameepisode;
}
AM_initVariables();
AM_loadPics();
}
//
// AM_minOutWindowScale()
//
// Set the window scale to the maximum size
//
// Passed nothing, returns nothing
//
void AM_minOutWindowScale()
{
scale_mtof = min_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// AM_maxOutWindowScale(void)
//
// Set the window scale to the minimum size
//
// Passed nothing, returns nothing
//
void AM_maxOutWindowScale(void)
{
scale_mtof = max_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// AM_Responder()
//
// Handle events (user inputs) in automap mode
//
// Passed an input event, returns true if its handled
//
boolean AM_Responder
( event_t* ev )
{
int rc;
static int bigstate=0;
static char buffer[20];
int ch; // phares
static int joywait = 0;
rc = false;
// [FG] automap joystick button
if (ev->type == ev_joystick && joywait < I_GetTime())
{
// [FG] crude hack converting the joystick button press into a key press
if (joybautomap > -1 && (ev->data1 & (1 << joybautomap)))
{
ev->type = ev_keydown;
ev->data1 = key_map;
joywait = I_GetTime() + 5;
}
}
if (!automapactive)
{
if (ev->type == ev_keydown && ev->data1 == key_map) // phares
{
AM_Start ();
viewactive = false;
rc = true;
}
}
else if (ev->type == ev_keydown)
{
rc = true;
ch = ev->data1; // phares
if (ch == key_map_right) // |
if (!followplayer) // V
m_paninc.x = FTOM(F_PANINC);
else
rc = false;
else if (ch == key_map_left)
if (!followplayer)
m_paninc.x = -FTOM(F_PANINC);
else
rc = false;
else if (ch == key_map_up)
if (!followplayer)
m_paninc.y = FTOM(F_PANINC);
else
rc = false;
else if (ch == key_map_down)
if (!followplayer)
m_paninc.y = -FTOM(F_PANINC);
else
rc = false;
else if (ch == key_map_zoomout)
{
mtof_zoommul = M_ZOOMOUT;
ftom_zoommul = M_ZOOMIN;
}
else if (ch == key_map_zoomin)
{
mtof_zoommul = M_ZOOMIN;
ftom_zoommul = M_ZOOMOUT;
}
else if (ch == key_map)
{
bigstate = 0;
viewactive = true;
AM_Stop ();
}
else if (ch == key_map_gobig)
{
bigstate = !bigstate;
if (bigstate)
{
AM_saveScaleAndLoc();
AM_minOutWindowScale();
}
else
AM_restoreScaleAndLoc();
}
else if (ch == key_map_follow)
{
followplayer = !followplayer;
f_oldloc.x = D_MAXINT;
// Ty 03/27/98 - externalized
plr->message = followplayer ? s_AMSTR_FOLLOWON : s_AMSTR_FOLLOWOFF;
}
else if (ch == key_map_grid)
{
automap_grid = !automap_grid; // killough 2/28/98
// Ty 03/27/98 - *not* externalized
plr->message = automap_grid ? s_AMSTR_GRIDON : s_AMSTR_GRIDOFF;
}
else if (ch == key_map_mark)
{
// Ty 03/27/98 - *not* externalized
sprintf(buffer, "%s %d", s_AMSTR_MARKEDSPOT, markpointnum);
plr->message = buffer;
AM_addMark();
}
else if (ch == key_map_clear)
{
AM_clearMarks(); // Ty 03/27/98 - *not* externalized
plr->message = s_AMSTR_MARKSCLEARED; // ^
} // |
else // phares
{
rc = false;
}
}
else if (ev->type == ev_keyup)
{
rc = false;
ch = ev->data1;
if (ch == key_map_right)
{
if (!followplayer)
m_paninc.x = 0;
}
else if (ch == key_map_left)
{
if (!followplayer)
m_paninc.x = 0;
}
else if (ch == key_map_up)
{
if (!followplayer)
m_paninc.y = 0;
}
else if (ch == key_map_down)
{
if (!followplayer)
m_paninc.y = 0;
}
else if ((ch == key_map_zoomout) || (ch == key_map_zoomin))
{
mtof_zoommul = FRACUNIT;
ftom_zoommul = FRACUNIT;
}
}
return rc;
}
//
// AM_changeWindowScale()
//
// Automap zooming
//
// Passed nothing, returns nothing
//
void AM_changeWindowScale(void)
{
// Change the scaling multipliers
scale_mtof = FixedMul(scale_mtof, mtof_zoommul);
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
if (scale_mtof < min_scale_mtof)
AM_minOutWindowScale();
else if (scale_mtof > max_scale_mtof)
AM_maxOutWindowScale();
else
AM_activateNewScale();
}
//
// AM_doFollowPlayer()
//
// Turn on follow mode - the map scrolls opposite to player motion
//
// Passed nothing, returns nothing
//
void AM_doFollowPlayer(void)
{
if (f_oldloc.x != plr->mo->x || f_oldloc.y != plr->mo->y)
{
m_x = FTOM(MTOF(plr->mo->x)) - m_w/2;
m_y = FTOM(MTOF(plr->mo->y)) - m_h/2;
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
f_oldloc.x = plr->mo->x;
f_oldloc.y = plr->mo->y;
}
}
//
// killough 10/98: return coordinates, to allow use of a non-follow-mode
// pointer. Allows map inspection without moving player to the location.
//
int map_point_coordinates;
void AM_Coordinates(const mobj_t *mo, fixed_t *x, fixed_t *y, fixed_t *z)
{
*z = followplayer || !map_point_coordinates ? *x = mo->x, *y = mo->y, mo->z :
R_PointInSubsector(*x = m_x+m_w/2, *y = m_y+m_h/2)->sector->floorheight;
}
//
// AM_Ticker()
//
// Updates on gametic - enter follow mode, zoom, or change map location
//
// Passed nothing, returns nothing
//
void AM_Ticker (void)
{
if (!automapactive)
return;
amclock++;
if (followplayer)
AM_doFollowPlayer();
// Change the zoom if necessary
if (ftom_zoommul != FRACUNIT)
AM_changeWindowScale();
// Change x,y location
if (m_paninc.x || m_paninc.y)
AM_changeWindowLoc();
}
//
// Clear automap frame buffer.
//
void AM_clearFB(int color)
{
memset(fb, color, f_w*f_h);
}
//
// AM_clipMline()
//
// Automap clipping of lines.
//
// Based on Cohen-Sutherland clipping algorithm but with a slightly
// faster reject and precalculated slopes. If the speed is needed,
// use a hash algorithm to handle the common cases.
//
// Passed the line's coordinates on map and in the frame buffer performs
// clipping on them in the lines frame coordinates.
// Returns true if any part of line was not clipped
//
boolean AM_clipMline
( mline_t* ml,
fline_t* fl )
{
enum
{
LEFT =1,
RIGHT =2,
BOTTOM =4,
TOP =8
};
register int outcode1 = 0;
register int outcode2 = 0;
register int outside;
fpoint_t tmp;
int dx;
int dy;
#define DOOUTCODE(oc, mx, my) \
(oc) = 0; \
if ((my) < 0) (oc) |= TOP; \
else if ((my) >= f_h) (oc) |= BOTTOM; \
if ((mx) < 0) (oc) |= LEFT; \
else if ((mx) >= f_w) (oc) |= RIGHT;
// do trivial rejects and outcodes
if (ml->a.y > m_y2)
outcode1 = TOP;
else if (ml->a.y < m_y)
outcode1 = BOTTOM;
if (ml->b.y > m_y2)
outcode2 = TOP;
else if (ml->b.y < m_y)
outcode2 = BOTTOM;
if (outcode1 & outcode2)
return false; // trivially outside
if (ml->a.x < m_x)
outcode1 |= LEFT;
else if (ml->a.x > m_x2)
outcode1 |= RIGHT;
if (ml->b.x < m_x)
outcode2 |= LEFT;
else if (ml->b.x > m_x2)
outcode2 |= RIGHT;
if (outcode1 & outcode2)
return false; // trivially outside
// transform to frame-buffer coordinates.
fl->a.x = CXMTOF(ml->a.x);
fl->a.y = CYMTOF(ml->a.y);
fl->b.x = CXMTOF(ml->b.x);
fl->b.y = CYMTOF(ml->b.y);
DOOUTCODE(outcode1, fl->a.x, fl->a.y);
DOOUTCODE(outcode2, fl->b.x, fl->b.y);