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xenocara/app/xlockmore/modes/glx/fire.c

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Importing xlockmore 5.22
2006-11-26 04:07:42 -07:00
/* -*- Mode: C; tab-width: 4 -*- */
/* fire --- 3D fire or rain landscape */
#if !defined( lint ) && !defined( SABER )
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 AT 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 MODE_fire
#define PROGCLASS "Fire"
#define HACK_INIT init_fire
#define HACK_DRAW draw_fire
#define HACK_RESHAPE reshape_fire
#define fire_opts xlockmore_opts
#define DEFAULTS "*delay: 10000 \n" \
"*count: 800 \n" \
"*size: 0 \n" \
"*trees: 5 \n" \
"*showFPS: False \n" \
"*trackmouse: False \n" \
"*wander: True \n" \
"*wireframe: False \n" \
"*fog: False \n" \
"*shadows: True \n" \
"*texture: True \n"
#include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
#include "xlock.h" /* from the xlockmore distribution */
#include "visgl.h"
#endif /* !STANDALONE */
#ifdef MODE_fire
#define MINSIZE 32
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glu.h>
#ifdef HAVE_XPM
#include "xpm-ximage.h"
#ifdef STANDALONE
#include "../images/ground.xpm"
#include "../images/tree.xpm"
#else /* !STANDALONE */
#include "pixmaps/ground.xpm"
#include "pixmaps/tree.xpm"
#endif /* !STANDALONE */
#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_TRACKMOUSE "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_trackmouse;
static Bool do_wander;
static int num_trees;
static int frame = 0;
static XFontStruct *mode_font = None;
static XrmOptionDescRec opts[] = {
{(char *) "-texture", (char *) ".fire.texture", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+texture", (char *) ".fire.texture", XrmoptionNoArg, (caddr_t) "off"},
{(char *) "-fog", (char *) ".fire.fog", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+fog", (char *) ".fire.fog", XrmoptionNoArg, (caddr_t) "off"},
{(char *) "-shadows", (char *) ".fire.shadows", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+shadows", (char *) ".fire.shadows", XrmoptionNoArg, (caddr_t) "off"},
{(char *) "-trackmouse", (char *) ".fire.trackmouse", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+trackmouse", (char *) ".fire.trackmouse", XrmoptionNoArg, (caddr_t) "off"},
{(char *) "-wander", (char *) ".fire.wander", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+wander", (char *) ".fire.wander", XrmoptionNoArg, (caddr_t) "off"},
{(char *) "-trees", (char *) ".fire.trees", XrmoptionSepArg, (caddr_t) NULL},
};
static argtype vars[] = {
{(void *) & do_texture, (char *) "texture", (char *) "Texture", (char *) DEF_TEXTURE, t_Bool},
{(void *) & do_fog, (char *) "fog", (char *) "Fog", (char *) DEF_FOG, t_Bool},
{(void *) & do_shadows, (char *) "shadows", (char *) "Shadows", (char *) DEF_SHADOWS, t_Bool},
{(void *) & do_trackmouse, (char *) "trackmouse", (char *) "TrackMouse", (char *) DEF_TRACKMOUSE, t_Bool},
{(void *) & do_wander, (char *) "wander", (char *) "Wander", (char *) DEF_WANDER, t_Bool},
{(void *) & num_trees, (char *) "trees", (char *) "Trees", (char *) DEF_TREES, t_Int},
};
static OptionStruct desc[] = {
{(char *) "-/+texture", (char *) "turn on/off texturing"},
{(char *) "-/+fog", (char *) "turn on/off fog"},
{(char *) "-/+shadows", (char *) "turn on/off shadows"},
{(char *) "-/+trackmouse", (char *) "turn on/off the tracking of the mouse"},
{(char *) "-/+wander", (char *) "turn on/off wandering"},
{(char *) "-trees num", (char *) "number of trees (0 disables)"},
};
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, 0, 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 float black[3] = { 0.0, 0.0, 0.0 }; /* shadow color */
static float partcol1[3] = { 1.0, 0.2, 0.0 }; /* initial color: red-ish */
static float partcol2[3] = { 1.0, 1.0, 0.0 }; /* blending color: yellow-ish */
static float fogcolor[4] = { 0.9, 0.9, 1.0, 1.0 };
/* ground */
static float q[4][3] = {
{-DIMP, 0.0, -DIMP},
{DIMP, 0.0, -DIMP},
{DIMP, 0.0, DIMP},
{-DIMP, 0.0, DIMP}
};
/* ground texture */
static 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;
} 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)
{
static clock_t told=0;
clock_t tnew,ris;
tnew=clock();
ris=tnew-told;
told=tnew;
return (ris/(float)CLOCKS_PER_SEC);
}
/* 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], *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 void drawtree(float x, float y, float z)
{
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);
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);
glEnd();
}
/* 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);
}
}
/* track the mouse in a joystick manner : not perfect but it works */
static void trackmouse(ModeInfo * mi)
{
firestruct *fs = &fire[MI_SCREEN(mi)];
/* we keep static values (not per screen) for the mouse stuff: in general you have only one mouse :-> */
static int max[2] = { 0, 0 };
static int min[2] = { 0x7fffffff, 0x7fffffff }, center[2];
Window r, c;
int rx, ry, cx, cy;
unsigned int m;
(void) XQueryPointer(MI_DISPLAY(mi), MI_WINDOW(mi),
&r, &c, &rx, &ry, &cx, &cy, &m);
if (max[0] < cx)
max[0] = cx;
if (min[0] > cx)
min[0] = cx;
center[0] = (max[0] + min[0]) / 2;
if (max[1] < cy)
max[1] = cy;
if (min[1] > cy)
min[1] = cy;
center[1] = (max[1] + min[1]) / 2;
if (fabs(center[0] - (float) cx) > 0.1 * (max[0] - min[0]))
fs->alpha += 2.5 * (center[0] - (float) cx) / (max[0] - min[0]);
if (fabs(center[1] - (float) cy) > 0.1 * (max[1] - min[1]))
fs->beta += 2.5 * (center[1] - (float) cy) / (max[1] - min[1]);
/* oops: can't get those buttons */
if (m & Button4Mask)
fs->v += 0.01;
if (m & Button5Mask)
fs->v -= 0.01;
}
/* initialise textures */
static void inittextures(ModeInfo * mi)
{
firestruct *fs = &fire[MI_SCREEN(mi)];
#ifdef HAVE_XPM
if (do_texture) {
glGenTextures(1, &fs->groundid);
#ifdef HAVE_GLBINDTEXTURE
glBindTexture(GL_TEXTURE_2D, fs->groundid);
#endif /* HAVE_GLBINDTEXTURE */
if ((fs->gtexture = xpm_to_ximage(MI_DISPLAY(mi), MI_VISUAL(mi),
MI_COLORMAP(mi), ground)) == 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);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
fs->gtexture->width, fs->gtexture->height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, fs->gtexture->data);
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 = xpm_to_ximage(MI_DISPLAY(mi), MI_VISUAL(mi),
MI_COLORMAP(mi), tree)) == None) {
(void)fprintf(stderr,"Error reading tree texture.\n");
glDeleteTextures(1, &fs->treeid);
fs->treeid = 0;
fs->num_trees = 0;
return;
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
fs->ttexture->width, fs->ttexture->height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, fs->ttexture->data);
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 /* !HAVE_XPM */
do_texture = False;
fs->groundid = 0; /* default textures */
fs->treeid = 0;
#endif /* !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.
*-----------------------------------------------------------------------------
*-----------------------------------------------------------------------------
*/
#ifndef STANDALONE
static void Reshape(ModeInfo * mi)
#else
void reshape_fire(ModeInfo * mi, int width, int height)
#endif
{
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);
if (do_trackmouse && !MI_IS_ICONIC(mi))
trackmouse(mi);
if (do_wander)
{
GLfloat x, y, z;
# define SINOID(SCALE,SIZE) \
((((1 + sin((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);
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);
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]);
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++)
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]);
}
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]);
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);
}
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);
}
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);
/* 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.
*-----------------------------------------------------------------------------
*-----------------------------------------------------------------------------
*/
static void
free_fire(firestruct *fs)
{
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) {
free(fs->p);
fs->p = (part *) NULL;
}
if (fs->r != NULL) {
free(fs->r);
fs->r = (rain *) NULL;
}
if (fs->treepos != NULL) {
free(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.
*-----------------------------------------------------------------------------
*/
void
init_fire(ModeInfo * mi)
{
firestruct *fs;
/* allocate the main fire table if needed */
if (fire == NULL) {
if ((fire = (firestruct *) calloc(MI_NUM_SCREENS(mi),
sizeof(firestruct))) == NULL)
return;
}
/* initialise the per screen fire structure */
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(fs);
return;
}
}
else if (fs->r == NULL) {
/* initialise rain particles if no fire particles */
if ((fs->r = (rain *) calloc(NUMPART, sizeof(part))) == NULL) {
free_fire(fs);
return;
}
}
/* check tree number */
if (do_texture)
fs->num_trees = (num_trees<MAX_TREES)?num_trees:MAX_TREES;
else
fs->num_trees = 0;
/* check wander/trackmouse */
if (do_trackmouse && do_wander) do_wander = 0;
/* 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(fs);
return;
}
} else {
MI_CLEARWINDOW(mi);
}
}
/*
*-----------------------------------------------------------------------------
* Called by the mainline code periodically to update the display.
*-----------------------------------------------------------------------------
*/
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));
DrawFire(mi);
#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.
*-----------------------------------------------------------------------------
*/
void release_fire(ModeInfo * mi)
{
if (fire != NULL) {
int screen;
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
free_fire(&fire[screen]);
free(fire);
fire = (firestruct *) NULL;
}
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);
}
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 /* MODE_fire */
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