/* -*- Mode: C; tab-width: 4 -*- */ /* fire --- 3D fire-like image */ #if !defined( lint ) && !defined( SABER ) static const char sccsid[] = "@(#)fire.c 5.00 2000/11/28 xlockmore"; #endif /* Copyright (c) E. Lassauge, 2000. */ /* * 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/). * * Eric Lassauge (October-10-2000) * http://lassauge.free.fr/linux.html * * REVISION HISTORY: * * 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). * - perhaps use an observer programmed movement: * watch out for the trees !!! */ #ifdef STANDALONE #define PROGCLASS "Fire" #define HACK_INIT init_fire #define HACK_DRAW draw_fire #define fire xlockmore_opts #define DEFAULTS "*delay: 10000 \n" \ "*count: 800 \n" \ "*size: 0 \n" \ "*trees: 5 \n" \ "*trackmouse: False \n" \ "*wireframe: False \n" /* still needs some work */ #include "xlockmore.h" /* from the xscreensaver distribution */ #else /* !STANDALONE */ #include "xlock.h" /* from the xlockmore distribution */ #include "vis.h" #endif /* !STANDALONE */ #include "iostuff.h" /* getFont() */ #ifdef MODE_fire #define MINSIZE 32 #include #include #include #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 */ /* 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_TREES "5" #define MAX_TREES 20 static Bool do_texture; static Bool do_fog; static Bool do_framerate; static Bool do_shadows; static Bool do_trackmouse; static int num_trees; 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 *) "-framerate", (char *) ".fire.framerate", XrmoptionNoArg, (caddr_t) "on"}, {(char *) "+framerate", (char *) ".fire.framerate", 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 *) "-trees", (char *) ".fire.trees", XrmoptionSepArg, (caddr_t) NULL}, }; static argtype vars[] = { {(caddr_t *) & do_texture, (char *) "texture", (char *) "Texture", (char *) DEF_TEXTURE, t_Bool}, {(caddr_t *) & do_fog, (char *) "fog", (char *) "Fog", (char *) DEF_FOG, t_Bool}, {(caddr_t *) & do_framerate, (char *) "framerate", (char *) "Framerate", (char *) DEF_FRAMERATE, t_Bool}, {(caddr_t *) & do_shadows, (char *) "shadows", (char *) "Shadows", (char *) DEF_SHADOWS, t_Bool}, {(caddr_t *) & do_trackmouse, (char *) "trackmouse", (char *) "TrackMouse", (char *) DEF_TRACKMOUSE, t_Bool}, {(caddr_t *) & 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 *) "-/+framerate", (char *) "turn on/off framerate display"}, {(char *) "-/+shadows", (char *) "turn on/off shadows"}, {(char *) "-/+trackmouse", (char *) "turn on/off the tracking of the mouse"}, {(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", 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 */ /* particle struct */ typedef struct { int age; float p[3][3]; float v[3]; float c[3][4]; } part; /* 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] = { 2.0, 1.0, 0.0 }; #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 particles : set it through 'count' resource */ float eject_r; /* emission radius */ float dt, maxage, eject_vy, eject_vl; float ridtri; /* particle size */ Bool shadows; /* misc booleans: set them through specific resources */ Bool fog; Bool framerate; part *p; /* particle 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 obs[3]; /* observer coordinates */ float dir[3]; /* view direction */ float v; /* observer velocity */ float alpha; /* observer angles */ float beta; clock_t told; /* frame timetag */ int frcount; /* frame counter */ char frbuf[80]; /* frame value string */ } firestruct; /* array of firestruct indexed by screen number */ static firestruct *fire = NULL; /* *----------------------------------------------------------------------------- *----------------------------------------------------------------------------- * Misc funcs. *----------------------------------------------------------------------------- *----------------------------------------------------------------------------- */ /* utility function for the framerate display */ static float gettime(firestruct * fs) { clock_t tnew, ris; tnew = clock(); ris = tnew - fs->told; fs->told = tnew; return (ris / (float) CLOCKS_PER_SEC); } /* my RAND */ static float vrnd(void) { return ((float) LRAND() / (float) MAXRAND); } /* initialise new 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); } /* set 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); } } /* 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]; } /* utility function for string printing for framerate */ static void printstring(GLuint fontbase, char *string) { int len; len = (int) strlen(string); glListBase(fontbase); glCallLists(len, GL_UNSIGNED_BYTE, (GLubyte *) string); } /* 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)]; 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; } } /* 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;inum_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((distTREEOUTR)); return True; } /* *----------------------------------------------------------------------------- *----------------------------------------------------------------------------- * GL funcs. *----------------------------------------------------------------------------- *----------------------------------------------------------------------------- */ static void Reshape(ModeInfo * mi) { 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) { float fr; int j; firestruct *fs = &fire[MI_SCREEN(mi)]; Bool wire = MI_IS_WIREFRAME(mi); if (do_trackmouse && !MI_IS_ICONIC(mi)) trackmouse(mi); 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;jnum_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(); /* manage framerate value */ if (fs->framerate && fs->frcount >= FRAME) { fs->frcount = 0; fr = gettime(fs); (void) sprintf(fs->frbuf, "Frame rate: %f", FRAME / fr); } glDisable(GL_TEXTURE_2D); glDisable(GL_ALPHA_TEST); glDisable(GL_DEPTH_TEST); glDisable(GL_FOG); /* manage framerate display */ if (fs->framerate) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-0.5, 639.5, -0.5, 479.5, -1.0, 1.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); /* draw framerate (red text) */ glColor3f(1.0, 0.0, 0.0); glRasterPos2i(10, 10); printstring(fs->fontbase, fs->frbuf); fs->frcount++; } 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; fs->frcount = 0; vinit(fs->obs, DEF_OBS[0], DEF_OBS[1], DEF_OBS[2]); fs->v = 0.0; fs->alpha = DEF_ALPHA; fs->beta = DEF_BETA; if (do_texture) inittextures(mi); else { fs->ttexture = (XImage*) NULL; fs->gtexture = (XImage*) NULL; } /* initialise font stuff */ if (fs->framerate) { Font id; unsigned int first, last; if (mode_font == None) mode_font = getFont(MI_DISPLAY(mi)); if (mode_font == None) { fs->framerate = False; } else { id = mode_font->fid; first = mode_font->min_char_or_byte2; last = mode_font->max_char_or_byte2; fs->fontbase = glGenLists((GLuint) last + 1); if (!fs->fontbase) { (void) fprintf(stderr, "%s: unable to allocate font lists.\n",MI_NAME(mi)); fs->framerate = False; } else { glXUseXFont(id, first, last - first + 1, fs->fontbase + first); } } } if (MI_IS_DEBUG(mi)) { (void) fprintf(stderr, "%s:\n\tnum_part=%d\n\ttrees=%d\n\tfog=%s\n\tframerate=%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->framerate ? "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)) { 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; } 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) { (void) free((void *) fs->p); fs->p = NULL; } if (fs->treepos != NULL) { (void) free((void *) fs->treepos); fs->treepos = 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; if (fire == NULL) { if ((fire = (firestruct *) calloc(MI_NUM_SCREENS(mi), sizeof(firestruct))) == NULL) return; } fs = &fire[MI_SCREEN(mi)]; fs->np = MI_COUNT(mi); fs->fog = do_fog; fs->shadows = do_shadows; fs->framerate = do_framerate; if (fs->p == NULL) { if ((fs->p = (part *) calloc(fs->np, sizeof(part))) == NULL) { free_fire(fs); return; } } if (do_texture) fs->num_trees = (num_treesnum_trees = 0; if ((fs->glx_context = init_GL(mi)) != NULL) { Reshape(mi); 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); Reshape(mi); 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]); (void) free((void *) fire); fire = 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 */ 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\tframerate=%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->framerate ? "on" : "off", fs->shadows ? "on" : "off", fs->eject_r, fs->ridtri); } } #endif /* MODE_fire */