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am_map.c
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am_map.c
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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// 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 "z_zone.h"
#include "doomdef.h"
#include "st_stuff.h"
#include "p_local.h"
#include "w_wad.h"
#include "m_cheat.h"
#include "i_system.h"
// Needs access to LFB.
#include "v_video.h"
// State.
#include "doomstat.h"
#include "r_state.h"
// Data.
#include "dstrings.h"
#include "am_map.h"
// For use if I do walls with outsides/insides
#define REDS (256-5*16)
#define REDRANGE 16
#define BLUES (256-4*16+8)
#define BLUERANGE 8
#define GREENS (7*16)
#define GREENRANGE 16
#define GRAYS (6*16)
#define GRAYSRANGE 16
#define BROWNS (4*16)
#define BROWNRANGE 16
#define YELLOWS (256-32+7)
#define YELLOWRANGE 1
#define BLACK 0
#define WHITE (256-47)
// Automap colors
#define BACKGROUND BLACK
#define YOURCOLORS WHITE
#define YOURRANGE 0
#define WALLCOLORS REDS
#define WALLRANGE REDRANGE
#define TSWALLCOLORS GRAYS
#define TSWALLRANGE GRAYSRANGE
#define FDWALLCOLORS BROWNS
#define FDWALLRANGE BROWNRANGE
#define CDWALLCOLORS YELLOWS
#define CDWALLRANGE YELLOWRANGE
#define THINGCOLORS GREENS
#define THINGRANGE GREENRANGE
#define SECRETWALLCOLORS WALLCOLORS
#define SECRETWALLRANGE WALLRANGE
#define GRIDCOLORS (GRAYS + GRAYSRANGE/2)
#define GRIDRANGE 0
#define XHAIRCOLORS GRAYS
// drawing stuff
#define FB 0
#define AM_PANDOWNKEY KEY_DOWNARROW
#define AM_PANUPKEY KEY_UPARROW
#define AM_PANRIGHTKEY KEY_RIGHTARROW
#define AM_PANLEFTKEY KEY_LEFTARROW
#define AM_ZOOMINKEY '='
#define AM_ZOOMOUTKEY '-'
#define AM_STARTKEY KEY_TAB
#define AM_ENDKEY KEY_TAB
#define AM_GOBIGKEY '0'
#define AM_FOLLOWKEY 'f'
#define AM_GRIDKEY 'g'
#define AM_MARKKEY 'm'
#define AM_CLEARMARKKEY 'c'
#define AM_NUMMARKPOINTS 10
// scale on entry
#define INITSCALEMTOF (.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
#define FTOM(x) FixedMul(((x)<<16),scale_ftom)
#define MTOF(x) (FixedMul((x),scale_mtof)>>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)))
// the following is crap
#define LINE_NEVERSEE ML_DONTDRAW
typedef struct {
int x, y;
} fpoint_t;
typedef struct {
fpoint_t a, b;
} fline_t;
typedef struct {
fixed_t x, y;
} mpoint_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 R ((8*PLAYERRADIUS)/7)
mline_t cheat_player_arrow[] = {
{{-R + R / 8, 0}, {R, 0}}, // -----
{{R, 0}, {R - R / 2, R / 6}}, // ----->
{{R, 0}, {R - R / 2, -R / 6}},
{{-R + R / 8, 0}, {-R - R / 8, R / 6}}, // >----->
{{-R + R / 8, 0}, {-R - R / 8, -R / 6}},
{{-R + 3 * R / 8, 0}, {-R + R / 8, R / 6}}, // >>----->
{{-R + 3 * R / 8, 0}, {-R + R / 8, -R / 6}},
{{-R / 2, 0}, {-R / 2, -R / 6}}, // >>-d--->
{{-R / 2, -R / 6}, {-R / 2 + R / 6, -R / 6}},
{{-R / 2 + R / 6, -R / 6}, {-R / 2 + R / 6, R / 4}},
{{-R / 6, 0}, {-R / 6, -R / 6}}, // >>-dd-->
{{-R / 6, -R / 6}, {0, -R / 6}},
{{0, -R / 6}, {0, R / 4}},
{{R / 6, R / 4}, {R / 6, -R / 7}}, // >>-ddt->
{{R / 6, -R / 7}, {R / 6 + R / 32, -R / 7 - R / 32}},
{{R / 6 + R / 32, -R / 7 - R / 32}, {R / 6 + R / 10, -R / 7}}
};
#undef R
#define R (FRACUNIT)
mline_t triangle_guy[] = {
{{(fixed_t) (-.867 * R), (fixed_t) (-.5 * R)},
{(fixed_t) (.867 * R), (fixed_t) (-.5 * R)}},
{{(fixed_t) (.867 * R), (fixed_t) (-.5 * R)},
{(fixed_t) (0), (fixed_t) (R)}},
{{(fixed_t) (0), (fixed_t) (R)},
{(fixed_t) (-.867 * R), (fixed_t) (-.5 * R)}}
};
#undef R
#define R (FRACUNIT)
mline_t thintriangle_guy[] = {
{{(fixed_t) (-.5 * R), (fixed_t) (-.7 * R)},
{(fixed_t) (R), (fixed_t) (0)}},
{{(fixed_t) (R), (fixed_t) (0)},
{(fixed_t) (-.5 * R), (fixed_t) (.7 * R)}},
{{(fixed_t) (-.5 * R), (fixed_t) (.7 * R)},
{(fixed_t) (-.5 * R), (fixed_t) (-.7 * R)}}
};
#undef R
static int cheating = 0;
static int grid = 0;
static int leveljuststarted = 1; // kluge until AM_LevelInit() is called
boolean automapactive = false;
static int finit_width = SCREENWIDTH;
static int finit_height = SCREENHEIGHT - 32;
// 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 in each tic (map coords)
static fixed_t ftom_zoommul; // how far the window zooms in each tic (fb coords)
static fixed_t m_x, m_y; // LL x,y where the window is on the map (map coords)
static fixed_t m_x2, m_y2; // UR x,y where the window is on the map (map coords)
//
// width/height of window on map (map coords)
//
static fixed_t m_w;
static fixed_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 fixed_t old_m_w, old_m_h;
static fixed_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 = (fixed_t) 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
static mpoint_t markpoints[AM_NUMMARKPOINTS]; // where the points are
static int markpointnum = 0; // next point to be assigned
static int followplayer = 1; // specifies whether to follow the player around
cheatseq_t cheat_amap = CHEAT("iddt", 0);
static boolean stopped = true;
extern boolean viewactive;
// 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.
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 ? -INT_MAX : INT_MAX);
else
is->islp = FixedDiv(dx, dy);
if (!dx)
is->slp = (dy < 0 ? -INT_MAX : INT_MAX);
else
is->slp = FixedDiv(dy, dx);
}
//
//
//
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;
}
//
//
//
void AM_saveScaleAndLoc(void)
{
old_m_x = m_x;
old_m_y = m_y;
old_m_w = m_w;
old_m_h = m_h;
}
//
//
//
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);
}
//
// adds a marker at the current location
//
void AM_addMark(void)
{
markpoints[markpointnum].x = m_x + m_w / 2;
markpoints[markpointnum].y = m_y + m_h / 2;
markpointnum = (markpointnum + 1) % AM_NUMMARKPOINTS;
}
//
// Determines bounding box of all vertices,
// sets global variables controlling zoom range.
//
void AM_findMinMaxBoundaries(void)
{
int i;
fixed_t a;
fixed_t b;
min_x = min_y = INT_MAX;
max_x = max_y = -INT_MAX;
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;
}
max_w = max_x - min_x;
max_h = max_y - min_y;
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 : b;
max_scale_mtof = FixedDiv(f_h << FRACBITS, 2 * PLAYERRADIUS);
}
//
//
//
void AM_changeWindowLoc(void)
{
if (m_paninc.x || m_paninc.y) {
followplayer = 0;
f_oldloc.x = INT_MAX;
}
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;
}
//
//
//
void AM_initVariables(void)
{
int pnum;
static event_t st_notify = { ev_keyup, AM_MSGENTERED, 0, 0 };
automapactive = true;
fb = screens[0];
f_oldloc.x = INT_MAX;
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[consoleplayer]) {
plr = &players[consoleplayer];
} else {
plr = &players[0];
for (pnum = 0; pnum < MAXPLAYERS; pnum++) {
if (playeringame[pnum]) {
plr = &players[pnum];
break;
}
}
}
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);
}
//
//
//
void AM_loadPics(void)
{
int i;
char namebuf[9];
for (i = 0; i < 10; i++) {
format_number(namebuf, "AMMNUM%d", i, 10);
marknums[i] = W_CacheLumpName(namebuf, PU_STATIC);
}
}
void AM_unloadPics(void)
{
int i;
char namebuf[9];
for (i = 0; i < 10; i++) {
format_number(namebuf, "AMMNUM%d", i, 10);
W_ReleaseLumpName(namebuf);
}
}
void AM_clearMarks(void)
{
int i;
for (i = 0; i < AM_NUMMARKPOINTS; i++)
markpoints[i].x = -1; // means empty
markpointnum = 0;
}
//
// should be called at the start of every level
// right now, i figure it out myself
//
void AM_LevelInit(void)
{
leveljuststarted = 0;
f_x = f_y = 0;
f_w = finit_width;
f_h = finit_height;
AM_clearMarks();
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);
}
//
//
//
void AM_Stop(void)
{
static event_t st_notify = { 0, ev_keyup, AM_MSGEXITED, 0 };
AM_unloadPics();
automapactive = false;
ST_Responder(&st_notify);
stopped = true;
}
//
//
//
void AM_Start(void)
{
static int lastlevel = -1, lastepisode = -1;
if (!stopped)
AM_Stop();
stopped = false;
if (lastlevel != gamemap || lastepisode != gameepisode) {
AM_LevelInit();
lastlevel = gamemap;
lastepisode = gameepisode;
}
AM_initVariables();
AM_loadPics();
}
//
// set the window scale to the maximum size
//
void AM_minOutWindowScale(void)
{
scale_mtof = min_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// set the window scale to the minimum size
//
void AM_maxOutWindowScale(void)
{
scale_mtof = max_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// Handle events (user inputs) in automap mode
//
boolean AM_Responder(event_t * ev) {
int rc;
static int cheatstate = 0;
static int bigstate = 0;
static char buffer[20];
rc = false;
if (!automapactive) {
if (ev->type == ev_keydown && ev->data1 == AM_STARTKEY) {
AM_Start();
viewactive = false;
rc = true;
}
}
else if (ev->type == ev_keydown) {
rc = true;
switch (ev->data1) {
case AM_PANRIGHTKEY: // pan right
if (!followplayer)
m_paninc.x = FTOM(F_PANINC);
else
rc = false;
break;
case AM_PANLEFTKEY: // pan left
if (!followplayer)
m_paninc.x = -FTOM(F_PANINC);
else
rc = false;
break;
case AM_PANUPKEY: // pan up
if (!followplayer)
m_paninc.y = FTOM(F_PANINC);
else
rc = false;
break;
case AM_PANDOWNKEY: // pan down
if (!followplayer)
m_paninc.y = -FTOM(F_PANINC);
else
rc = false;
break;
case AM_ZOOMOUTKEY: // zoom out
mtof_zoommul = M_ZOOMOUT;
ftom_zoommul = M_ZOOMIN;
break;
case AM_ZOOMINKEY: // zoom in
mtof_zoommul = M_ZOOMIN;
ftom_zoommul = M_ZOOMOUT;
break;
case AM_ENDKEY:
bigstate = 0;
viewactive = true;
AM_Stop();
break;
case AM_GOBIGKEY:
bigstate = !bigstate;
if (bigstate) {
AM_saveScaleAndLoc();
AM_minOutWindowScale();
} else
AM_restoreScaleAndLoc();
break;
case AM_FOLLOWKEY:
followplayer = !followplayer;
f_oldloc.x = INT_MAX;
if (followplayer)
plr->message = AMSTR_FOLLOWON;
else
plr->message = AMSTR_FOLLOWOFF;
break;
case AM_GRIDKEY:
grid = !grid;
if (grid)
plr->message = AMSTR_GRIDON;
else
plr->message = AMSTR_GRIDOFF;
break;
case AM_MARKKEY:
format_number(buffer, AMSTR_MARKEDSPOT " %d",
markpointnum, 10);
plr->message = buffer;
AM_addMark();
break;
case AM_CLEARMARKKEY:
AM_clearMarks();
plr->message = AMSTR_MARKSCLEARED;
break;
default:
cheatstate = 0;
rc = false;
}
if (!deathmatch && cht_CheckCheat(&cheat_amap, ev->data2)) {
rc = false;
cheating = (cheating + 1) % 3;
}
}
else if (ev->type == ev_keyup) {
rc = false;
switch (ev->data1) {
case AM_PANRIGHTKEY:
if (!followplayer)
m_paninc.x = 0;
break;
case AM_PANLEFTKEY:
if (!followplayer)
m_paninc.x = 0;
break;
case AM_PANUPKEY:
if (!followplayer)
m_paninc.y = 0;
break;
case AM_PANDOWNKEY:
if (!followplayer)
m_paninc.y = 0;
break;
case AM_ZOOMOUTKEY:
case AM_ZOOMINKEY:
mtof_zoommul = FRACUNIT;
ftom_zoommul = FRACUNIT;
break;
}
}
return rc;
}
//
// Zooming
//
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();
}
//
//
//
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;
// m_x = FTOM(MTOF(plr->mo->x - m_w/2));
// m_y = FTOM(MTOF(plr->mo->y - m_h/2));
// m_x = plr->mo->x - m_w/2;
// m_y = plr->mo->y - m_h/2;
}
}
//
//
//
void AM_updateLightLev(void)
{
static int nexttic = 0;
//static int litelevels[] = { 0, 3, 5, 6, 6, 7, 7, 7 };
static int litelevels[] = { 0, 4, 7, 10, 12, 14, 15, 15 };
static int litelevelscnt = 0;
// Change light level
if (amclock > nexttic) {
lightlev = litelevels[litelevelscnt++];
if (litelevelscnt == arrlen(litelevels))
litelevelscnt = 0;
nexttic = amclock + 6 - (amclock % 6);
}
}
//
// Updates on Game Tick
//
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();
// Update light level
// AM_updateLightLev();
}
//
// Clear automap frame buffer.
//
void AM_clearFB(int color)
{
memset(fb, color, f_w * f_h);
}
//
// 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.
//
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);
if (outcode1 & outcode2)
return false;
while (outcode1 | outcode2) {
// may be partially inside box
// find an outside point
if (outcode1)
outside = outcode1;
else
outside = outcode2;
// clip to each side
if (outside & TOP) {
dy = fl->a.y - fl->b.y;
dx = fl->b.x - fl->a.x;
tmp.x = fl->a.x + (dx * (fl->a.y)) / dy;
tmp.y = 0;
} else if (outside & BOTTOM) {
dy = fl->a.y - fl->b.y;
dx = fl->b.x - fl->a.x;
tmp.x = fl->a.x + (dx * (fl->a.y - f_h)) / dy;
tmp.y = f_h - 1;
} else if (outside & RIGHT) {
dy = fl->b.y - fl->a.y;
dx = fl->b.x - fl->a.x;
tmp.y = fl->a.y + (dy * (f_w - 1 - fl->a.x)) / dx;
tmp.x = f_w - 1;
} else if (outside & LEFT) {
dy = fl->b.y - fl->a.y;
dx = fl->b.x - fl->a.x;
tmp.y = fl->a.y + (dy * (-fl->a.x)) / dx;
tmp.x = 0;
} else {
tmp.x = 0;
tmp.y = 0;
}
if (outside == outcode1) {
fl->a = tmp;
DOOUTCODE(outcode1, fl->a.x, fl->a.y);
} else {
fl->b = tmp;
DOOUTCODE(outcode2, fl->b.x, fl->b.y);
}
if (outcode1 & outcode2)
return false; // trivially outside
}
return true;
}
#undef DOOUTCODE
//
// Classic Bresenham w/ whatever optimizations needed for speed
//
void AM_drawFline(fline_t * fl, int color) {
register int x;
register int y;
register int dx;
register int dy;
register int sx;
register int sy;
register int ax;
register int ay;
register int d;
// For debugging only
if (fl->a.x < 0 || fl->a.x >= f_w
|| fl->a.y < 0 || fl->a.y >= f_h
|| fl->b.x < 0 || fl->b.x >= f_w || fl->b.y < 0 || fl->b.y >= f_h) {
return;
}
#define PUTDOT(xx,yy,cc) fb[(yy)*f_w+(xx)]=(cc)
dx = fl->b.x - fl->a.x;
ax = 2 * (dx < 0 ? -dx : dx);
sx = dx < 0 ? -1 : 1;
dy = fl->b.y - fl->a.y;
ay = 2 * (dy < 0 ? -dy : dy);
sy = dy < 0 ? -1 : 1;
x = fl->a.x;
y = fl->a.y;
if (ax > ay) {
d = ay - ax / 2;
while (1) {
PUTDOT(x, y, color);
if (x == fl->b.x)
return;
if (d >= 0) {
y += sy;
d -= ax;
}
x += sx;
d += ay;
}
} else {
d = ax - ay / 2;
while (1) {
PUTDOT(x, y, color);
if (y == fl->b.y)
return;
if (d >= 0) {
x += sx;
d -= ay;
}
y += sy;
d += ax;
}