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;
}
static void
setpart(part * p)
{
float fact;
if (p->p[0][1] < 0.1) {
setnewpart(p);
return;
}
p->v[1] += AGRAV * dt;
vadds(p->p[0], dt, p->v);
vadds(p->p[1], dt, p->v);
vadds(p->p[2], dt, p->v);
p->age++;
if ((p->age) > maxage) {
vequ(p->c[0], blu2);
vequ(p->c[1], blu2);
vequ(p->c[2], blu2);
}
else {
fact = 1.0 / maxage;
vadds(p->c[0], fact, blu2);
vclamp(p->c[0]);
p->c[0][3] = fact * (maxage - p->age);
vadds(p->c[1], fact, blu2);
vclamp(p->c[1]);
p->c[1][3] = fact * (maxage - p->age);
vadds(p->c[2], fact, blu2);
vclamp(p->c[2]);
p->c[2][3] = fact * (maxage - p->age);
}
}
/* 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);
}
}
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;
}
int main(int ac,char **av)
{
int i;
fprintf(stderr,"Fire V1.5\nWritten by David Bucciarelli ([email protected])\n");
/* Default settings */
WIDTH=640;
HEIGHT=480;
np=800;
eject_r=0.1;
dt=0.015;
eject_vy=4;
eject_vl=1;
shadows=1;
ridtri=0.1;
maxage=1.0/dt;
if(ac==2)
np=atoi(av[1]);
if(ac==4) {
WIDTH=atoi(av[2]);
HEIGHT=atoi(av[3]);
}
glutInitWindowPosition(0,0);
glutInitWindowSize(WIDTH,HEIGHT);
glutInit(&ac,av);
glutInitDisplayMode(GLUT_RGB|GLUT_DEPTH|GLUT_DOUBLE);
glutCreateWindow("Fire");
reshape(WIDTH,HEIGHT);
inittextures();
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_FOG);
glFogi(GL_FOG_MODE,GL_EXP);
glFogfv(GL_FOG_COLOR,fogcolor);
glFogf(GL_FOG_DENSITY,0.1);
#ifdef FX
glHint(GL_FOG_HINT,GL_NICEST);
#endif
p=malloc(sizeof(part)*np);
for(i=0;i<np;i++)
setnewpart(&p[i]);
inittree();
glutKeyboardFunc(key);
glutSpecialFunc(special);
glutDisplayFunc(drawfire);
glutIdleFunc(drawfire);
glutReshapeFunc(reshape);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
int
main(int ac, char **av)
{
int i;
fprintf(stderr,
"Fire V1.5\nWritten by David Bucciarelli ([email protected])\n");
/* Default settings */
np = 800;
eject_r = -0.65;
dt = 0.015;
eject_vy = 4;
eject_vl = 1;
shadows = 1;
ridtri = 0.25;
maxage = 1.0 / dt;
if (ac == 2) {
np = atoi(av[1]);
if (np <= 0 || np > 1000000) {
fprintf(stderr, "Invalid input.\n");
exit(-1);
}
}
if (ac == 4) {
WIDTH = atoi(av[2]);
HEIGHT = atoi(av[3]);
}
glutInitWindowSize(WIDTH, HEIGHT);
glutInit(&ac, av);
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
if (!(win = glutCreateWindow("Fire"))) {
fprintf(stderr, "Error opening a window.\n");
exit(-1);
}
reshape(WIDTH, HEIGHT);
inittextures();
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_FOG);
glFogi(GL_FOG_MODE, GL_EXP);
glFogfv(GL_FOG_COLOR, fogcolor);
glFogf(GL_FOG_DENSITY, 0.1);
assert(np > 0);
p = (part *) malloc(sizeof(part) * np);
assert(p);
for (i = 0; i < np; i++)
setnewpart(&p[i]);
inittree();
glutKeyboardFunc(key);
glutSpecialFunc(special);
glutDisplayFunc(drawfire);
glutIdleFunc(idle);
glutReshapeFunc(reshape);
glutMainLoop();
return (0);
}
