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xenocara/dist/Mesa/progs/demos/rain.cxx

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C++
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/*
* This program is under the GNU GPL.
* Use at your own risk.
*
* written by David Bucciarelli (humanware@plus.it)
* Humanware s.r.l.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <GL/glut.h>
#ifndef M_PI
#define M_PI 3.14159265
#endif
#include "particles.h"
extern "C" {
#include "readtex.h"
}
#ifdef _WIN32
#include <windows.h>
#include <mmsystem.h>
#endif
#ifdef XMESA
#include "GL/xmesa.h"
static int fullscreen=1;
#endif
static int WIDTH=640;
static int HEIGHT=480;
static int NUMPART=7500;
#define FRAME 50
static float fogcolor[4]={1.0,1.0,1.0,1.0};
#define DIMP 40.0
#define DIMTP 32.0
static float q[4][3]={
{-DIMP,0.0,-DIMP},
{DIMP,0.0,-DIMP},
{DIMP,0.0,DIMP},
{-DIMP,0.0,DIMP}
};
static float qt[4][2]={
{-DIMTP,-DIMTP},
{DIMTP,-DIMTP},
{DIMTP,DIMTP},
{-DIMTP,DIMTP}
};
static int win=0;
static int fog=1;
static int help=1;
static GLuint groundid;
static float obs[3]={2.0,1.0,0.0};
static float dir[3];
static float v=0.0;
static float alpha=-90.0;
static float beta=90.0;
static particleSystem *ps;
static float gettime()
{
static clock_t told=0;
clock_t tnew,ris;
tnew=clock();
ris=tnew-told;
told=tnew;
return(ris/(float)CLOCKS_PER_SEC);
}
static float gettimerain()
{
static clock_t told=0;
clock_t tnew,ris;
tnew=clock();
ris=tnew-told;
told=tnew;
return(ris/(float)CLOCKS_PER_SEC);
}
static void calcposobs(void)
{
dir[0]=sin(alpha*M_PI/180.0);
dir[2]=cos(alpha*M_PI/180.0)*sin(beta*M_PI/180.0);
dir[1]=cos(beta*M_PI/180.0);
obs[0]+=v*dir[0];
obs[1]+=v*dir[1];
obs[2]+=v*dir[2];
rainParticle::setRainingArea(obs[0]-7.0f,-0.2f,obs[2]-7.0f,obs[0]+7.0f,8.0f,obs[2]+7.0f);
}
static void printstring(void *font, const char *string)
{
int len,i;
len=(int)strlen(string);
for(i=0;i<len;i++)
glutBitmapCharacter(font,string[i]);
}
static void reshape(int width, int height)
{
WIDTH=width;
HEIGHT=height;
glViewport(0,0,(GLint)width,(GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(70.0,width/(float)height,0.1,30.0);
glMatrixMode(GL_MODELVIEW);
}
static void printhelp(void)
{
glEnable(GL_BLEND);
glColor4f(0.0,0.0,0.0,0.5);
glRecti(40,40,600,440);
glDisable(GL_BLEND);
glColor3f(1.0,0.0,0.0);
glRasterPos2i(300,420);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Help");
glRasterPos2i(60,390);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"h - Toggle Help");
glRasterPos2i(60,360);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"f - Toggle Fog");
glRasterPos2i(60,330);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Arrow Keys - Rotate");
glRasterPos2i(60,300);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"a - Increase velocity");
glRasterPos2i(60,270);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"z - Decrease velocity");
glRasterPos2i(60,240);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"l - Increase rain length");
glRasterPos2i(60,210);
printstring(GLUT_BITMAP_TIMES_ROMAN_24,"k - Decrease rain length");
}
static void drawrain(void)
{
static int count=0;
static char frbuf[80];
float fr;
glEnable(GL_DEPTH_TEST);
if(fog)
glEnable(GL_FOG);
else
glDisable(GL_FOG);
glDepthMask(GL_TRUE);
glClearColor(1.0,1.0,1.0,1.0);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
calcposobs();
gluLookAt(obs[0],obs[1],obs[2],
obs[0]+dir[0],obs[1]+dir[1],obs[2]+dir[2],
0.0,1.0,0.0);
glColor4f(1.0,1.0,1.0,1.0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,groundid);
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();
// Particle System
glDisable(GL_TEXTURE_2D);
glShadeModel(GL_SMOOTH);
glEnable(GL_BLEND);
ps->draw();
ps->addTime(gettimerain());
glShadeModel(GL_FLAT);
if((count % FRAME)==0) {
fr=gettime();
sprintf(frbuf,"Frame rate: %f",FRAME/fr);
}
glDisable(GL_TEXTURE_2D);
glDisable(GL_DEPTH_TEST);
glDisable(GL_FOG);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-0.5,639.5,-0.5,479.5,-1.0,1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glColor3f(1.0,0.0,0.0);
glRasterPos2i(10,10);
printstring(GLUT_BITMAP_HELVETICA_18,frbuf);
glRasterPos2i(350,470);
printstring(GLUT_BITMAP_HELVETICA_10,"Rain V1.0 Written by David Bucciarelli (humanware@plus.it)");
if(help)
printhelp();
reshape(WIDTH,HEIGHT);
glPopMatrix();
glutSwapBuffers();
count++;
}
static void special(int key, int x, int y)
{
switch (key) {
case GLUT_KEY_LEFT:
alpha+=2.0;
break;
case GLUT_KEY_RIGHT:
alpha-=2.0;
break;
case GLUT_KEY_DOWN:
beta-=2.0;
break;
case GLUT_KEY_UP:
beta+=2.0;
break;
}
}
static void key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(0);
break;
case 'a':
v+=0.01;
break;
case 'z':
v-=0.01;
break;
case 'l':
rainParticle::setLength(rainParticle::getLength()+0.025f);
break;
case 'k':
rainParticle::setLength(rainParticle::getLength()-0.025f);
break;
case 'h':
help=(!help);
break;
case 'f':
fog=(!fog);
break;
#ifdef XMESA
case ' ':
XMesaSetFXmode(fullscreen ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW);
fullscreen=(!fullscreen);
break;
#endif
}
}
static void inittextures(void)
{
GLubyte *img;
GLint width,height;
GLenum format;
GLenum gluerr;
glGenTextures(1,&groundid);
glBindTexture(GL_TEXTURE_2D,groundid);
if(!(img=LoadRGBImage("../images/s128.rgb",&width,&height,&format))){
fprintf(stderr,"Error reading a texture.\n");
exit(-1);
}
glPixelStorei(GL_UNPACK_ALIGNMENT,4);
if((gluerr=(GLenum)gluBuild2DMipmaps(GL_TEXTURE_2D, 3, width, height,GL_RGB,
GL_UNSIGNED_BYTE, (GLvoid *)(img)))) {
fprintf(stderr,"GLULib%s\n",gluErrorString(gluerr));
exit(-1);
}
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_LINEAR_MIPMAP_LINEAR);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL);
}
static void initparticle(void)
{
ps=new particleSystem;
rainParticle::setRainingArea(-7.0f,-0.2f,-7.0f,7.0f,8.0f,7.0f);
for(int i=0;i<NUMPART;i++) {
rainParticle *p=new rainParticle;
p->randomHeight();
ps->addParticle((particle *)p);
}
}
int main(int ac,char **av)
{
fprintf(stderr,"Rain V1.0\nWritten by David Bucciarelli (humanware@plus.it)\n");
/* Default settings */
WIDTH=640;
HEIGHT=480;
glutInitWindowPosition(0,0);
glutInitWindowSize(WIDTH,HEIGHT);
glutInit(&ac,av);
glutInitDisplayMode(GLUT_RGB|GLUT_DEPTH|GLUT_DOUBLE);
if(!(win=glutCreateWindow("Rain"))) {
fprintf(stderr,"Error opening a window.\n");
exit(-1);
}
reshape(WIDTH,HEIGHT);
inittextures();
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
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
initparticle();
glutKeyboardFunc(key);
glutSpecialFunc(special);
glutDisplayFunc(drawrain);
glutIdleFunc(drawrain);
glutReshapeFunc(reshape);
glutMainLoop();
return(0);
}
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