Original 5.40

1 files changed, 1097 insertions, 0 deletions

diff --git a/hacks/glx/glforestfire.c b/hacks/glx/glforestfire.c
new file mode 100644
index 0000000..bcc9ed7
--- /dev/null
+++ b/hacks/glx/glforestfire.c
@@ -0,0 +1,1097 @@
+/* -*- Mode: C; tab-width: 4 -*- */
+/* fire --- 3D fire or rain landscape */
+
+#if 0
+static const char sccsid[] = "@(#)fire.c	5.02 2001/09/26 xlockmore";
+#endif
+
+/* Copyright (c) E. Lassauge, 2001. */
+
+/*
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted,
+ * provided that the above copyright notice appear in all copies and that
+ * both that copyright notice and this permission notice appear in
+ * supporting documentation.
+ *
+ * This file is provided AS IS with no warranties of any kind.  The author
+ * shall have no liability with respect to the infringement of copyrights,
+ * trade secrets or any patents by this file or any part thereof.  In no
+ * event will the author be liable for any lost revenue or profits or
+ * other special, indirect and consequential damages.
+ *
+ * The original code for this mode was written by David Bucciarelli 
+ * (tech.hmw@plus.it) and could be found in the demo package 
+ * of Mesa (Mesa-3.2/3Dfx/demos/). This mode is the result of the merge of
+ * two of the David's demos (fire and rain).
+ *
+ * Eric Lassauge  (October-10-2000) <lassauge@users.sourceforge.net>
+ * 				    http://lassauge.free.fr/linux.html
+ *
+ * REVISION HISTORY:
+ *
+ * E.Lassauge - 26-Sep-2001:
+ *      - add wander option and code 
+ *      - cleanups for xscreensaver
+ *
+ * E.Lassauge - 09-Mar-2001:
+ *      - get rid of my framerate options to use showfps
+ *
+ * E.Lassauge - 12-Jan-2001:
+ *      - add rain particules, selected if count=0 (no fire means rain !)
+ *
+ * E.Lassauge - 28-Nov-2000:
+ *      - modified release part to add freeing of GL objects
+ *
+ * E.Lassauge - 14-Nov-2000:
+ *      - use new common xpm_to_ximage function
+ *
+ * E.Lassauge - 25-Oct-2000:
+ *	- add the trees (with a new resource '-trees')
+ *      - corrected handling of color (textured vs untextured)
+ *      - corrected handling of endiannes for the xpm files
+ *      - inverted ground pixmap file
+ *      - use malloc-ed tree array
+ *
+ * TSchmidt - 23-Oct-2000:
+ *	- added size option like used in sproingies mode
+ *
+ * E.Lassauge - 13-Oct-2000:
+ *	- when trackmouse and window is iconified (login screen): stop tracking
+ *	- add pure GLX handling of framerate display (erased GLUT stuff)
+ *	- made count a per screen variable and update it only if framemode
+ *	- changes for no_texture an wireframe modes
+ *	- change no_texture color for the ground
+ *	- add freeing of texture image
+ *	- misc comments and little tweakings
+ *
+ * TODO:
+ *      - perhaps use a user supplied xpm for ground image (or a whatever image
+ *        file using ImageMagick ?)
+ *	- random number of trees ? change trees at change_fire ?
+ *	- fix wireframe mode: it's too CPU intensive.
+ *	- look how we can get the Wheel events (Button4&5).
+ */
+
+
+#ifdef STANDALONE	/* xscreensaver mode */
+#define DEFAULTS "*delay:     10000 \n" \
+		"*count: 	800 \n" \
+		"*size:           0 \n" \
+		"*showFPS:    False \n" \
+		"*wireframe:  False \n"	\
+
+#define MODE_fire
+#include "xlockmore.h"		/* from the xscreensaver distribution */
+#include "gltrackball.h"
+#else				/* !STANDALONE */
+#include "xlock.h"		/* from the xlockmore distribution */
+#include "visgl.h"
+#endif				/* !STANDALONE */
+
+#ifdef MODE_fire
+
+#define MINSIZE 32
+
+#if defined( USE_XPM ) || defined( USE_XPMINC ) || defined(STANDALONE)
+/* USE_XPM & USE_XPMINC in xlock mode ; HAVE_XPM in xscreensaver mode */
+#include "ximage-loader.h"
+#define I_HAVE_XPM
+
+#include "images/gen/ground_png.h"
+#include "images/gen/tree_png.h"
+#endif /* HAVE_XPM */
+
+/* vector utility macros */
+#define vinit(a,i,j,k) {\
+  (a)[0]=i;\
+  (a)[1]=j;\
+  (a)[2]=k;\
+}
+
+#define vinit4(a,i,j,k,w) {\
+  (a)[0]=i;\
+  (a)[1]=j;\
+  (a)[2]=k;\
+  (a)[3]=w;\
+}
+
+#define vadds(a,dt,b) {\
+  (a)[0]+=(dt)*(b)[0];\
+  (a)[1]+=(dt)*(b)[1];\
+  (a)[2]+=(dt)*(b)[2];\
+}
+
+#define vequ(a,b) {\
+  (a)[0]=(b)[0];\
+  (a)[1]=(b)[1];\
+  (a)[2]=(b)[2];\
+}
+
+#define vinter(a,dt,b,c) {\
+  (a)[0]=(dt)*(b)[0]+(1.0-dt)*(c)[0];\
+  (a)[1]=(dt)*(b)[1]+(1.0-dt)*(c)[1];\
+  (a)[2]=(dt)*(b)[2]+(1.0-dt)*(c)[2];\
+}
+
+#define clamp(a)        ((a) < 0.0 ? 0.0 : ((a) < 1.0 ? (a) : 1.0))
+
+#define vclamp(v) {\
+  (v)[0]=clamp((v)[0]);\
+  (v)[1]=clamp((v)[1]);\
+  (v)[2]=clamp((v)[2]);\
+}
+
+/* Manage option vars */
+#define DEF_TEXTURE	"True"
+#define DEF_FOG		"False"
+#define DEF_SHADOWS	"True"
+#define DEF_FRAMERATE	"False"
+#define DEF_WANDER	"True"
+#define DEF_TREES	"5"
+#define MAX_TREES	20
+static Bool do_texture;
+static Bool do_fog;
+static Bool do_shadows;
+static Bool do_wander;
+static int num_trees;
+static XFontStruct *mode_font = None;
+
+static XrmOptionDescRec opts[] = {
+    {"-texture", ".fire.texture", XrmoptionNoArg, "on"},
+    {"+texture", ".fire.texture", XrmoptionNoArg, "off"},
+    {"-fog", ".fire.fog", XrmoptionNoArg, "on"},
+    {"+fog", ".fire.fog", XrmoptionNoArg, "off"},
+    {"-shadows", ".fire.shadows", XrmoptionNoArg, "on"},
+    {"+shadows", ".fire.shadows", XrmoptionNoArg, "off"},
+    {"-wander", ".fire.wander", XrmoptionNoArg, "on"},
+    {"+wander", ".fire.wander", XrmoptionNoArg, "off"},
+    {"-trees", ".fire.trees", XrmoptionSepArg, 0},
+    {"-rain", ".fire.count", XrmoptionNoArg, "0"},
+
+};
+
+static argtype vars[] = {
+    {&do_texture,    "texture",    "Texture",    DEF_TEXTURE,    t_Bool},
+    {&do_fog,        "fog",        "Fog",        DEF_FOG,        t_Bool},
+    {&do_shadows,    "shadows",    "Shadows",    DEF_SHADOWS,    t_Bool},
+    {&do_wander,     "wander",     "Wander",     DEF_WANDER,     t_Bool},
+    {&num_trees,     "trees",      "Trees",      DEF_TREES,      t_Int},
+};
+
+static OptionStruct desc[] = {
+    {"-/+texture", "turn on/off texturing"},
+    {"-/+fog", "turn on/off fog"},
+    {"-/+shadows", "turn on/off shadows"},
+    {"-/+wander", "turn on/off wandering"},
+    {"-trees num", "number of trees (0 disables)"},
+};
+
+ENTRYPOINT ModeSpecOpt fire_opts =
+ { sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc };
+
+#ifdef USE_MODULES
+ModStruct fire_description =
+    { "fire", "init_fire", "draw_fire", "release_fire",
+    "draw_fire", "change_fire", (char *) NULL, &fire_opts,
+    10000, 800, 1, 400, 64, 1.0, "",
+    "Shows a 3D fire-like image", 0, NULL
+};
+#endif /* USE_MODULES */
+
+/* misc defines */
+#define TREEINR		2.5	/* tree min distance */
+#define TREEOUTR	8.0	/* tree max distance */
+#define FRAME 		50	/* frame count interval */
+#define DIMP 		20.0	/* dimension of ground */
+#define DIMTP 		16.0	/* dimension of ground texture */
+
+#define RIDCOL 		0.4	/* factor for color blending */
+
+#define AGRAV 		-9.8	/* gravity */
+
+#define NUMPART		7500	/* rain particles */
+
+/* fire particle struct */
+typedef struct {
+    int age;
+    float p[3][3];
+    float v[3];
+    float c[3][4];
+} part;
+
+/* rain particle struct */
+typedef struct {
+    float age;
+    float acc[3];
+    float vel[3];
+    float pos[3];
+    float partLength;
+    float oldpos[3];
+} rain;
+
+/* colors */
+static const GLfloat black[3]    = { 0.0, 0.0, 0.0 }; /* shadow color */
+static const GLfloat partcol1[3] = { 1.0, 0.2, 0.0 }; /* initial color: red-ish */
+static const GLfloat partcol2[3] = { 1.0, 1.0, 0.0 }; /* blending color: yellow-ish */
+static const GLfloat fogcolor[4] = { 0.9, 0.9, 1.0, 1.0 };
+
+/* ground */
+static const float q[4][3] = {
+    {-DIMP, 0.0, -DIMP},
+    {DIMP, 0.0, -DIMP},
+    {DIMP, 0.0, DIMP},
+    {-DIMP, 0.0, DIMP}
+};
+
+/* ground texture */
+static const float qt[4][2] = {
+    {-DIMTP, -DIMTP},
+    {DIMTP, -DIMTP},
+    {DIMTP, DIMTP},
+    {-DIMTP, DIMTP}
+};
+
+/* default values for observer */
+static const float DEF_OBS[3] = { 2.0f, 1.0f, 0.0f };
+#define DEV_V		0.0
+#define DEF_ALPHA	-90.0
+#define DEF_BETA	90.0
+
+/* tree struct */
+typedef struct {
+    float x,y,z;
+} treestruct;
+
+/* the mode struct, contains all per screen variables */
+typedef struct {
+    GLint WIDTH, HEIGHT;	/* display dimensions */
+    GLXContext *glx_context;
+
+    int np;			/* number of fire particles : set it through 'count' resource */
+    float eject_r;		/* emission radius */
+    float dt, maxage, eject_vy, eject_vl;
+    float ridtri;		/* fire particle size */
+    Bool shadows;		/* misc booleans: set them through specific resources */
+    Bool fog;
+
+    part *p;			/* fire particles array */
+    rain *r;			/* rain particles array */
+
+    XImage *gtexture;		/* ground texture image bits */
+    XImage *ttexture;		/* tree texture image bits */
+    GLuint groundid;		/* ground texture id: GL world */
+    GLuint treeid;		/* tree texture id: GL world */
+    GLuint fontbase;		/* fontbase id: GL world */
+
+    int   num_trees;		/* number of trees: set it through 'trees' resource */
+    treestruct *treepos;	/* trees positions: float treepos[num_trees][3] */
+
+    float min[3];		/* raining area */
+    float max[3];
+
+    float obs[3];		/* observer coordinates */
+    float dir[3];		/* view direction */
+    float v;			/* observer velocity */
+    float alpha;		/* observer angles */
+    float beta;
+
+    trackball_state *trackball;
+    Bool button_down_p;
+    int frame;
+
+} firestruct;
+
+/* array of firestruct indexed by screen number */
+static firestruct *fire = (firestruct *) NULL;
+
+/*
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ *    Misc funcs.
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ */
+
+/* utility function for the rain particles */
+static float gettimerain(void)
+{
+#if 0
+  /* Oh yeah, *that's* portable!  WTF. */
+  /* 
+   * I really thought clock() was standard ... EL
+   * I found this on the net:
+   * The clock() function conforms to ISO/IEC 9899:1990 (``ISO C89'') 
+   * */
+
+  static clock_t told= (clock_t)0;
+  clock_t tnew,ris;
+
+  tnew=clock();
+
+  ris=tnew-told;
+
+  told=tnew;
+
+  return (0.0125 + ris/(float)CLOCKS_PER_SEC);
+#else
+  return 0.0150;
+#endif
+}
+
+/* my RAND */
+static float vrnd(void)
+{
+    return ((float) LRAND() / (float) MAXRAND);
+}
+
+/* initialise new fire particle */
+static void setnewpart(firestruct * fs, part * p)
+{
+    float a, vi[3];
+    const float *c;
+
+    p->age = 0;
+
+    a = vrnd() * M_PI * 2.0;
+
+    vinit(vi, sin(a) * fs->eject_r * vrnd(), 0.15, cos(a) * fs->eject_r * vrnd());
+    vinit(p->p[0], vi[0] + vrnd() * fs->ridtri, vi[1] + vrnd() * fs->ridtri, vi[2] + vrnd() * fs->ridtri);
+    vinit(p->p[1], vi[0] + vrnd() * fs->ridtri, vi[1] + vrnd() * fs->ridtri, vi[2] + vrnd() * fs->ridtri);
+    vinit(p->p[2], vi[0] + vrnd() * fs->ridtri, vi[1] + vrnd() * fs->ridtri, vi[2] + vrnd() * fs->ridtri);
+
+    vinit(p->v, vi[0] * fs->eject_vl / (fs->eject_r / 2),
+	  vrnd() * fs->eject_vy + fs->eject_vy / 2,
+	  vi[2] * fs->eject_vl / (fs->eject_r / 2));
+
+    c = partcol1;
+
+    vinit4(p->c[0], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0);
+    vinit4(p->c[1], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0);
+    vinit4(p->c[2], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL),
+	   c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0);
+}
+
+/* initialise new rain particle */
+static void setnewrain(firestruct * fs, rain * r)
+{
+    r->age=0.0f;
+
+    vinit(r->acc,0.0f,-0.98f,0.0f);
+    vinit(r->vel,0.0f,0.0f,0.0f);
+    
+    r->partLength=0.2f;
+
+    vinit(r->oldpos,fs->min[0]+(fs->max[0]-fs->min[0])*vrnd(),
+                    fs->max[1]+0.2f*fs->max[1]*vrnd(),
+                    fs->min[2]+(fs->max[2]-fs->min[2])*vrnd());
+    vequ(r->pos,r->oldpos);
+    vadds(r->oldpos,-(r->partLength),r->vel);
+
+    r->pos[1]=(fs->max[1]-fs->min[1])*vrnd()+fs->min[1];
+    r->oldpos[1]=r->pos[1]-r->partLength*r->vel[1];
+}
+
+/* set fire particle values */
+static void setpart(firestruct * fs, part * p)
+{
+    float fact;
+
+    if (p->p[0][1] < 0.1) {
+	setnewpart(fs, p);
+	return;
+    }
+
+    p->v[1] += AGRAV * fs->dt;
+
+    vadds(p->p[0], fs->dt, p->v);
+    vadds(p->p[1], fs->dt, p->v);
+    vadds(p->p[2], fs->dt, p->v);
+
+    p->age++;
+
+    if ((p->age) > fs->maxage) {
+	vequ(p->c[0], partcol2);
+	vequ(p->c[1], partcol2);
+	vequ(p->c[2], partcol2);
+    } else {
+	fact = 1.0 / fs->maxage;
+	vadds(p->c[0], fact, partcol2);
+	vclamp(p->c[0]);
+	p->c[0][3] = fact * (fs->maxage - p->age);
+
+	vadds(p->c[1], fact, partcol2);
+	vclamp(p->c[1]);
+	p->c[1][3] = fact * (fs->maxage - p->age);
+
+	vadds(p->c[2], fact, partcol2);
+	vclamp(p->c[2]);
+	p->c[2][3] = fact * (fs->maxage - p->age);
+    }
+}
+
+/* set rain particle values */
+static void setpartrain(firestruct * fs, rain * r, float dt)
+{
+    r->age += dt;
+
+    vadds(r->vel,dt,r->acc);
+    vadds(r->pos,dt,r->vel);
+
+    if(r->pos[0]<fs->min[0])
+	r->pos[0]=fs->max[0]-(fs->min[0]-r->pos[0]);
+    if(r->pos[2]<fs->min[2])
+	r->pos[2]=fs->max[2]-(fs->min[2]-r->pos[2]);
+
+    if(r->pos[0]>fs->max[0])
+	r->pos[0]=fs->min[0]+(r->pos[0]-fs->max[0]);
+    if(r->pos[2]>fs->max[2])
+	r->pos[2]=fs->min[2]+(r->pos[2]-fs->max[2]);
+
+    vequ(r->oldpos,r->pos);
+    vadds(r->oldpos,-(r->partLength),r->vel);
+    if(r->pos[1]<fs->min[1])
+    	setnewrain(fs, r);
+}
+
+/* draw a tree */
+static int drawtree(float x, float y, float z)
+{
+    int polys = 0;
+    glBegin(GL_QUADS);
+    glTexCoord2f(0.0,0.0);
+    glVertex3f(x-1.5,y+0.0,z);
+
+    glTexCoord2f(1.0,0.0);
+    glVertex3f(x+1.5,y+0.0,z);
+
+    glTexCoord2f(1.0,1.0);
+    glVertex3f(x+1.5,y+3.0,z);
+
+    glTexCoord2f(0.0,1.0);
+    glVertex3f(x-1.5,y+3.0,z);
+    polys++;
+
+
+    glTexCoord2f(0.0,0.0);
+    glVertex3f(x,y+0.0,z-1.5);
+
+    glTexCoord2f(1.0,0.0);
+    glVertex3f(x,y+0.0,z+1.5);
+
+    glTexCoord2f(1.0,1.0);
+    glVertex3f(x,y+3.0,z+1.5);
+
+    glTexCoord2f(0.0,1.0);
+    glVertex3f(x,y+3.0,z-1.5);
+    polys++;
+
+    glEnd();
+
+    return polys;
+}
+
+/* calculate observer position : modified only if trackmouse is used */
+static void calcposobs(firestruct * fs)
+{
+    fs->dir[0] = sin(fs->alpha * M_PI / 180.0);
+    fs->dir[2] =
+	cos(fs->alpha * M_PI / 180.0) * sin(fs->beta * M_PI / 180.0);
+    fs->dir[1] = cos(fs->beta * M_PI / 180.0);
+
+    fs->obs[0] += fs->v * fs->dir[0];
+    fs->obs[1] += fs->v * fs->dir[1];
+    fs->obs[2] += fs->v * fs->dir[2];
+
+    if (!fs->np)
+    {
+    	vinit(fs->min,fs->obs[0]-7.0f,-0.2f,fs->obs[2]-7.0f);
+    	vinit(fs->max,fs->obs[0]+7.0f,8.0f,fs->obs[2]+7.0f);
+    }
+}
+
+
+/* initialise textures */
+static void inittextures(ModeInfo * mi)
+{
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+
+#if defined( I_HAVE_XPM )
+    if (do_texture) {
+
+	glGenTextures(1, &fs->groundid);
+#ifdef HAVE_GLBINDTEXTURE
+	glBindTexture(GL_TEXTURE_2D, fs->groundid);
+#endif /* HAVE_GLBINDTEXTURE */
+
+        if ((fs->gtexture = image_data_to_ximage(MI_DISPLAY(mi), MI_VISUAL(mi),
+                                                 ground_png,
+                                                 sizeof(ground_png)))
+            == None) {
+	    (void) fprintf(stderr, "Error reading the ground texture.\n");
+	    glDeleteTextures(1, &fs->groundid);
+            do_texture = False;
+	    fs->groundid = 0;
+	    fs->treeid   = 0;
+	    return;
+	}
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+    clear_gl_error();
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+                 fs->gtexture->width, fs->gtexture->height, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, fs->gtexture->data);
+    check_gl_error("texture");
+
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+
+        if (fs->num_trees)
+	{
+	    glGenTextures(1, &fs->treeid);
+#ifdef HAVE_GLBINDTEXTURE
+	    glBindTexture(GL_TEXTURE_2D,fs->treeid);
+#endif /* HAVE_GLBINDTEXTURE */
+            if ((fs->ttexture = image_data_to_ximage(MI_DISPLAY(mi),
+                                                     MI_VISUAL(mi),
+                                                     tree_png,
+                                                     sizeof(tree_png)))
+                == None) {
+	      (void)fprintf(stderr,"Error reading tree texture.\n");
+	      glDeleteTextures(1, &fs->treeid);
+	      fs->treeid    = 0;
+              fs->num_trees = 0; 
+	      return;
+	    }
+
+        clear_gl_error();
+	    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+                     fs->ttexture->width, fs->ttexture->height, 0,
+                     GL_RGBA, GL_UNSIGNED_BYTE, fs->ttexture->data);
+        check_gl_error("texture");
+
+	    glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
+	    glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
+
+	    glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
+	    glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
+
+	    glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
+	}
+    }
+    else
+    {
+	fs->groundid = 0;	/* default textures */
+	fs->treeid   = 0;
+    }
+#else /* !I_HAVE_XPM */
+  do_texture = False;
+  fs->groundid = 0;       /* default textures */
+  fs->treeid = 0;
+#endif /* !I_HAVE_XPM */
+}
+
+/* init tree array and positions */
+static Bool inittree(ModeInfo * mi)
+{
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+    int i;
+    float dist;
+
+    /* allocate treepos array */
+    if ((fs->treepos = (treestruct *) malloc(fs->num_trees *
+					sizeof(treestruct))) == NULL) {
+		return False;
+    }
+    /* initialise positions */
+    for(i=0;i<fs->num_trees;i++) {
+      do {
+        fs->treepos[i].x =vrnd()*TREEOUTR*2.0-TREEOUTR;
+        fs->treepos[i].y =0.0;
+        fs->treepos[i].z =vrnd()*TREEOUTR*2.0-TREEOUTR;
+        dist = sqrt(fs->treepos[i].x * fs->treepos[i].x +
+                    fs->treepos[i].z * fs->treepos[i].z);
+      } while((dist<TREEINR) || (dist>TREEOUTR));
+    }
+	return True;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ *    GL funcs.
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ */
+
+ENTRYPOINT void reshape_fire(ModeInfo * mi, int width, int height)
+{
+
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+    int size = MI_SIZE(mi);
+
+    /* Viewport is specified size if size >= MINSIZE && size < screensize */
+    if (size <= 1) {
+        fs->WIDTH = MI_WIDTH(mi);
+        fs->HEIGHT = MI_HEIGHT(mi);
+    } else if (size < MINSIZE) {
+        fs->WIDTH = MINSIZE;
+        fs->HEIGHT = MINSIZE;
+    } else {
+        fs->WIDTH = (size > MI_WIDTH(mi)) ? MI_WIDTH(mi) : size;
+        fs->HEIGHT = (size > MI_HEIGHT(mi)) ? MI_HEIGHT(mi) : size;
+    }
+    glViewport((MI_WIDTH(mi) - fs->WIDTH) / 2, (MI_HEIGHT(mi) - fs->HEIGHT) / 2, fs->WIDTH, fs->HEIGHT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(70.0, fs->WIDTH / (float) fs->HEIGHT, 0.1, 30.0);
+
+    glMatrixMode(GL_MODELVIEW);
+
+}
+
+static void DrawFire(ModeInfo * mi)
+{
+    int j;
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+    Bool wire = MI_IS_WIREFRAME(mi);
+
+    mi->polygon_count = 0;
+
+    if (do_wander && !fs->button_down_p)
+    {
+	GLfloat x, y, z;
+
+#       define SINOID(SCALE,SIZE) \
+        ((((1 + sin((fs->frame * (SCALE)) / 2 * M_PI)) / 2.0) * (SIZE)) - (SIZE)/2)
+
+        x = SINOID(0.031, 0.85);
+        y = SINOID(0.017, 0.25);
+        z = SINOID(0.023, 0.85);
+        fs->frame++;
+        fs->obs[0] = x + DEF_OBS[0];
+        fs->obs[1] = y + DEF_OBS[1];
+        fs->obs[2] = z + DEF_OBS[2];
+        fs->dir[1] = y;
+        fs->dir[2] = z;
+    }
+
+    glEnable(GL_DEPTH_TEST);
+
+    if (fs->fog)
+	glEnable(GL_FOG);
+    else
+	glDisable(GL_FOG);
+
+    glDepthMask(GL_TRUE);
+    glClearColor(0.5, 0.5, 0.8, 1.0);	/* sky in the distance */
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glPushMatrix();
+
+    calcposobs(fs);
+
+    gltrackball_rotate (fs->trackball);
+
+    gluLookAt(fs->obs[0], fs->obs[1], fs->obs[2],
+              fs->obs[0] + fs->dir[0], 
+              fs->obs[1] + fs->dir[1],
+              fs->obs[2] + fs->dir[2],
+              0.0, 1.0, 0.0);
+
+    glEnable(GL_TEXTURE_2D);
+
+    /* draw ground using the computed texture */
+    if (do_texture) {
+	glColor4f(1.0,1.0,1.0,1.0);	/* white to get texture in it's true color */
+#ifdef HAVE_GLBINDTEXTURE
+	glBindTexture(GL_TEXTURE_2D, fs->groundid);
+#endif /* HAVE_GLBINDTEXTURE */
+    }
+    else
+        glColor4f(0.54, 0.27, 0.07, 1.0);	/* untextured ground color */
+    glBegin(GL_QUADS);
+    glTexCoord2fv(qt[0]);
+    glVertex3fv(q[0]);
+    glTexCoord2fv(qt[1]);
+    glVertex3fv(q[1]);
+    glTexCoord2fv(qt[2]);
+    glVertex3fv(q[2]);
+    glTexCoord2fv(qt[3]);
+    glVertex3fv(q[3]);
+    mi->polygon_count++;
+    glEnd();
+
+    glAlphaFunc(GL_GEQUAL, 0.9);
+    if (fs->num_trees)
+    {
+	/* here do_texture IS True - and color used is white */
+	glEnable(GL_ALPHA_TEST);
+#ifdef HAVE_GLBINDTEXTURE
+	glBindTexture(GL_TEXTURE_2D,fs->treeid);
+#endif /* HAVE_GLBINDTEXTURE */
+	for(j=0;j<fs->num_trees;j++)
+      mi->polygon_count += drawtree(fs->treepos[j].x ,fs->treepos[j].y ,fs->treepos[j].z );
+    	glDisable(GL_ALPHA_TEST);
+    }
+    glDisable(GL_TEXTURE_2D);
+    glDepthMask(GL_FALSE);
+
+    if (fs->shadows) {
+	/* draw shadows with black color */
+	glBegin(wire ? GL_LINE_STRIP : GL_TRIANGLES);
+	for (j = 0; j < fs->np; j++) {
+	    glColor4f(black[0], black[1], black[2], fs->p[j].c[0][3]);
+	    glVertex3f(fs->p[j].p[0][0], 0.1, fs->p[j].p[0][2]);
+
+	    glColor4f(black[0], black[1], black[2], fs->p[j].c[1][3]);
+	    glVertex3f(fs->p[j].p[1][0], 0.1, fs->p[j].p[1][2]);
+
+	    glColor4f(black[0], black[1], black[2], fs->p[j].c[2][3]);
+	    glVertex3f(fs->p[j].p[2][0], 0.1, fs->p[j].p[2][2]);
+        mi->polygon_count++;
+	}
+	glEnd();
+    }
+
+    glBegin(wire ? GL_LINE_STRIP : GL_TRIANGLES);
+    for (j = 0; j < fs->np; j++) {
+	/* draw particles: colors are computed in setpart */
+	glColor4fv(fs->p[j].c[0]);
+	glVertex3fv(fs->p[j].p[0]);
+
+	glColor4fv(fs->p[j].c[1]);
+	glVertex3fv(fs->p[j].p[1]);
+
+	glColor4fv(fs->p[j].c[2]);
+	glVertex3fv(fs->p[j].p[2]);
+    mi->polygon_count++;
+
+	setpart(fs, &fs->p[j]);
+    }
+    glEnd();
+
+    /* draw rain particles if no fire particles */
+    if (!fs->np)
+    {
+        float timeused = gettimerain();
+        glDisable(GL_TEXTURE_2D);
+	glShadeModel(GL_SMOOTH);
+	glBegin(GL_LINES);
+	for (j = 0; j < NUMPART; j++) {
+	    glColor4f(0.7f,0.95f,1.0f,0.0f);
+	    glVertex3fv(fs->r[j].oldpos);
+	    glColor4f(0.3f,0.7f,1.0f,1.0f);
+	    glVertex3fv(fs->r[j].pos);
+	    setpartrain(fs, &fs->r[j],timeused);
+        mi->polygon_count++;
+	}
+	glEnd();
+	glShadeModel(GL_FLAT);
+    }
+
+    glDisable(GL_TEXTURE_2D);
+    glDisable(GL_ALPHA_TEST);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_FOG);
+
+    /* manage framerate display */
+    if (MI_IS_FPS(mi)) do_fps (mi);
+    glPopMatrix();
+}
+
+
+static Bool Init(ModeInfo * mi)
+{
+    int i;
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+
+    /* default settings */
+    fs->eject_r = 0.1 + NRAND(10) * 0.03;
+    fs->dt = 0.015;
+    fs->eject_vy = 4;
+    fs->eject_vl = 1;
+    fs->ridtri = 0.1 + NRAND(10) * 0.005;
+    fs->maxage = 1.0 / fs->dt;
+    vinit(fs->obs, DEF_OBS[0], DEF_OBS[1], DEF_OBS[2]);
+    fs->v = 0.0;
+    fs->alpha = DEF_ALPHA;
+    fs->beta = DEF_BETA;
+
+    /* initialise texture stuff */
+    if (do_texture)
+    	inittextures(mi);
+    else
+    {
+	fs->ttexture = (XImage*) NULL;
+	fs->gtexture = (XImage*) NULL;
+    }
+
+    if (MI_IS_DEBUG(mi)) {
+	(void) fprintf(stderr,
+		       "%s:\n\tnum_part=%d\n\ttrees=%d\n\tfog=%s\n\tshadows=%s\n\teject_r=%.3f\n\tridtri=%.3f\n",
+		       MI_NAME(mi),
+		       fs->np,
+		       fs->num_trees,
+		       fs->fog ? "on" : "off",
+		       fs->shadows ? "on" : "off",
+		       fs->eject_r, fs->ridtri);
+    }
+
+    /* initialise particles and trees */
+    for (i = 0; i < fs->np; i++) {
+	setnewpart(fs, &(fs->p[i]));
+    }
+
+    if (fs->num_trees)
+	if (!inittree(mi)) {
+		return False;
+	}
+
+    /* if no fire particles then initialise rain particles */
+    if (!fs->np)
+    {
+	vinit(fs->min,-7.0f,-0.2f,-7.0f);
+  	vinit(fs->max,7.0f,8.0f,7.0f);
+    	for (i = 0; i < NUMPART; i++) {
+	    setnewrain(fs, &(fs->r[i]));
+    	}
+    }
+    
+    return True;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ *    Xlock hooks.
+ *-----------------------------------------------------------------------------
+ *-----------------------------------------------------------------------------
+ */
+
+
+ENTRYPOINT void
+free_fire(ModeInfo * mi)
+{
+	firestruct *fs = &fire[MI_SCREEN(mi)];
+
+	if (mode_font != None && fs->fontbase != None) {
+		glDeleteLists(fs->fontbase, mode_font->max_char_or_byte2 -
+			mode_font->min_char_or_byte2 + 1);
+		fs->fontbase = None;
+	}
+
+	if (fs->p != NULL) {
+		(void) free((void *) fs->p);
+		fs->p = (part *) NULL;
+	}
+	if (fs->r != NULL) {
+		(void) free((void *) fs->r);
+		fs->r = (rain *) NULL;
+	}
+	if (fs->treepos != NULL) {
+		(void) free((void *) fs->treepos);
+		fs->treepos = (treestruct *) NULL;
+	}
+	if (fs->ttexture != None) {
+		glDeleteTextures(1, &fs->treeid);
+		XDestroyImage(fs->ttexture);
+		fs->ttexture = None;
+	}
+	if (fs->gtexture != None) {
+		glDeleteTextures(1, &fs->groundid);
+		XDestroyImage(fs->gtexture);
+		fs->gtexture = None;
+	}
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *    Initialize fire.  Called each time the window changes.
+ *-----------------------------------------------------------------------------
+ */
+
+ENTRYPOINT void
+init_fire(ModeInfo * mi)
+{
+    firestruct *fs;
+
+    MI_INIT (mi, fire);
+    fs = &fire[MI_SCREEN(mi)];
+    fs->np = MI_COUNT(mi);
+    fs->fog = do_fog;
+    fs->shadows = do_shadows;
+    /* initialise fire particles if any */
+    if ((fs->np)&&(fs->p == NULL)) {
+	if ((fs->p = (part *) calloc(fs->np, sizeof(part))) == NULL) {
+	    free_fire(mi);
+	    return;
+	}
+    }
+    else if (fs->r == NULL) {
+        /* initialise rain particles if no fire particles */
+	if ((fs->r = (rain *) calloc(NUMPART, sizeof(part))) == NULL) {
+	    free_fire(mi);
+	    return;
+	}
+    }
+
+    /* check tree number */
+    if (do_texture)
+    	fs->num_trees = (num_trees<MAX_TREES)?num_trees:MAX_TREES;
+    else
+    	fs->num_trees = 0;
+
+    fs->trackball = gltrackball_init (False);
+
+    /* xlock GL stuff */
+    if ((fs->glx_context = init_GL(mi)) != NULL) {
+
+#ifndef STANDALONE
+	Reshape(mi); /* xlock mode */
+#else
+	reshape_fire(mi,MI_WIDTH(mi),MI_HEIGHT(mi)); /* xscreensaver mode */
+#endif
+	glDrawBuffer(GL_BACK);
+	if (!Init(mi)) {
+		free_fire(mi);
+		return;
+	}
+    } else {
+	MI_CLEARWINDOW(mi);
+    }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *    Called by the mainline code periodically to update the display.
+ *-----------------------------------------------------------------------------
+ */
+ENTRYPOINT void draw_fire(ModeInfo * mi)
+{
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+
+    Display *display = MI_DISPLAY(mi);
+    Window window = MI_WINDOW(mi);
+
+    MI_IS_DRAWN(mi) = True;
+
+    if (!fs->glx_context)
+	return;
+
+    glXMakeCurrent(display, window, *(fs->glx_context));
+
+    glShadeModel(GL_FLAT);
+    glEnable(GL_DEPTH_TEST);
+
+    /* makes particles blend with background */
+    if (!MI_IS_WIREFRAME(mi)||(!fs->np))
+    {
+    	glEnable(GL_BLEND);
+    	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    }
+
+    /* fog stuff */
+    glEnable(GL_FOG);
+    glFogi(GL_FOG_MODE, GL_EXP);
+    glFogfv(GL_FOG_COLOR, fogcolor);
+    glFogf(GL_FOG_DENSITY, 0.03);
+    glHint(GL_FOG_HINT, GL_NICEST);
+
+    glPushMatrix();
+    glRotatef(current_device_rotation(), 0, 0, 1);
+    DrawFire(mi);
+    glPopMatrix();
+#ifndef STANDALONE
+    Reshape(mi); /* xlock mode */
+#else
+    reshape_fire(mi,MI_WIDTH(mi),MI_HEIGHT(mi)); /* xscreensaver mode */
+#endif
+
+    glFinish();
+    glXSwapBuffers(display, window);
+}
+
+
+/*
+ *-----------------------------------------------------------------------------
+ *    The display is being taken away from us.  Free up malloc'ed
+ *      memory and X resources that we've alloc'ed.  Only called
+ *      once, we must zap everything for every screen.
+ *-----------------------------------------------------------------------------
+ */
+
+ENTRYPOINT void release_fire(ModeInfo * mi)
+{
+    if (mode_font != None)
+    {
+	/* only free-ed when there are no more screens used */
+	XFreeFont(MI_DISPLAY(mi), mode_font);
+	mode_font = None;
+    }
+    FreeAllGL(mi);
+}
+
+ENTRYPOINT Bool
+fire_handle_event (ModeInfo *mi, XEvent *event)
+{
+  firestruct *fs = &fire[MI_SCREEN(mi)];
+
+  if (gltrackball_event_handler (event, fs->trackball,
+                                 MI_WIDTH (mi), MI_HEIGHT (mi),
+                                 &fs->button_down_p))
+    return True;
+
+  return False;
+}
+
+
+#ifndef STANDALONE
+ENTRYPOINT void change_fire(ModeInfo * mi)
+{
+    firestruct *fs = &fire[MI_SCREEN(mi)];
+
+    if (!fs->glx_context)
+	return;
+
+    glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(fs->glx_context));
+
+    /* if available, randomly change some values */
+    if (do_fog)
+	fs->fog = LRAND() & 1;
+    if (do_shadows)
+	fs->shadows = LRAND() & 1;
+    /* reset observer position */
+    frame = 0;
+    vinit(fs->obs, DEF_OBS[0], DEF_OBS[1], DEF_OBS[2]);
+    fs->v = 0.0;
+    /* particle randomisation */
+    fs->eject_r = 0.1 + NRAND(10) * 0.03;
+    fs->ridtri = 0.1 + NRAND(10) * 0.005;
+
+    if (MI_IS_DEBUG(mi)) {
+	(void) fprintf(stderr,
+		       "%s:\n\tnum_part=%d\n\ttrees=%d\n\tfog=%s\n\tshadows=%s\n\teject_r=%.3f\n\tridtri=%.3f\n",
+		       MI_NAME(mi),
+		       fs->np,
+		       fs->num_trees,
+		       fs->fog ? "on" : "off",
+		       fs->shadows ? "on" : "off",
+		       fs->eject_r, fs->ridtri);
+    }
+}
+#endif /* !STANDALONE */
+
+XSCREENSAVER_MODULE_2 ("GLForestFire", glforestfire, fire)
+
+#endif /* MODE_fire */