Camera::Camera(glm::vec3 const & position, glm::vec3 const & t, glm::vec3 const & up,
float sensibility, float speed):
m_phi(0), m_theta(0), m_position(position), m_target(t), m_up(up),
m_orientation(), m_sideShift(), m_modelview(), m_sensibility(sensibility),
m_speed(speed), m_mouseEnabled(true), m_needUpdateMV(true)
{
target(t);
m_sideShift = glm::normalize(glm::cross(m_up, m_orientation));
updateMV();
}
int
main(int argc, char *argv[])
{
unsigned *cloud;
int texcomps, texwid, texht;
GLUquadricObj *sphere;
/* start and end of particles */
static GLfloat begin[] = {0.f, -25.f, 0.f};
static GLfloat end[] = {0.f,-100.f, 0.f};
static GLfloat fogcolor[] = {.4f, .4f, .4f, 1.f};
glutInitWindowSize(winwid, winht);
glutInit(&argc, argv);
if(argc > 1)
{
char *args = argv[1];
int done = GL_FALSE;
while(!done)
{
switch(*args)
{
case 's': /* single buffer */
printf("Single Buffered\n");
dblbuf = GL_FALSE;
break;
case '-': /* do nothing */
break;
case 0:
done = GL_TRUE;
break;
}
args++;
}
}
if(dblbuf)
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_STENCIL|GLUT_DOUBLE);
else
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_STENCIL);
(void)glutCreateWindow("snow demo");
glutDisplayFunc(redraw);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(key);
glutIdleFunc(idle);
glutCreateMenu(menu);
glutAddMenuEntry("Toggle Overcast (o, O)", OVERCAST);
glutAddMenuEntry("Toggle Fog (f, F)", FOG);
glutAddMenuEntry("Toggle Snow (s, S)", SNOW);
glutAddMenuEntry("Bigger Flakes (+)", BIGGER);
glutAddMenuEntry("Smaller Flakes (-)", SMALLER);
glutAddMenuEntry("Reset Flake Size to One (r, R)", RESETSIZE);
glutAddMenuEntry("Toggle Point Antialiasing (a, A)", ANTIALIAS);
glutAddMenuEntry("Snow Blending (b, B)", BLEND);
glutAddMenuEntry("Exit Program", EXIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
printf("OpenGL Version %s\n", glGetString(GL_VERSION));
/* draw a perspective scene */
glMatrixMode(GL_PROJECTION);
glFrustum(-5., 5., -5., 5., 10., 1000.);
glMatrixMode(GL_MODELVIEW);
updateMV();
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
/* turn on features */
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
/* place light 0 in the right place */
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
glClearColor(0.f, 0.f, 1.f, 1.f);
glFogfv(GL_FOG_COLOR, fogcolor);
glFogi(GL_FOG_MODE, GL_LINEAR);
glFogf(GL_FOG_START, -200.f);
glFogf(GL_FOG_END, 200.f);
glHint(GL_FOG_HINT, GL_NICEST);
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
/* makes texturing faster, and looks better than GL_LINEAR */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glNewList(LIGHT, GL_COMPILE);
glDisable(GL_LIGHTING);
sphere = gluNewQuadric();
glColor3f(.7f, .2f, .7f);
gluSphere(sphere, 5.f, 10, 10);
gluDeleteQuadric(sphere);
glEnable(GL_LIGHTING);
glEndList();
/* 10 X 20; vary size with transforms */
/* one corner of house on origin; bottom on xz plane */
glNewList(HOUSE, GL_COMPILE);
glBegin(GL_QUADS);
/* walls of house */
glColor3f(1.f, 1.f, 0.f);
/* front */
glNormal3f( 0.f, 0.f, 1.f);
glVertex3i( 0, 0, 0);
glVertex3i(10, 0, 0);
glVertex3i(10,10, 0);
glVertex3i( 0,10, 0);
/* back */
glNormal3f( 0.f, 0.f, -1.f);
glVertex3i( 0, 0, -20);
glVertex3i( 0,10, -20);
glVertex3i(10,10, -20);
glVertex3i(10, 0, -20);
/* left */
glNormal3f(-1, 0.f, 0.f);
glVertex3i( 0, 0, 0);
glVertex3i( 0, 10, 0);
glVertex3i( 0, 10, -20);
glVertex3i( 0, 0, -20);
/* right */
glNormal3f( 1.f, 0.f, 0.f);
glVertex3i(10, 0, 0);
glVertex3i(10, 0, -20);
glVertex3i(10, 10, -20);
glVertex3i(10, 10, 0);
/* roof of house */
glColor3f(.8f, .1f, .1f);
/* left top */
glNormal3f(-.707f, .707f, 0.f);
glVertex3i( 0, 10, 0);
glVertex3i( 5, 15, 0);
glVertex3i( 5, 15, -20);
glVertex3i( 0, 10, -20);
/* right top */
glNormal3f( .707f, .707f, 0.f);
glVertex3i(10, 10, 0);
glVertex3i(10, 10, -20);
glVertex3i( 5, 15, -20);
glVertex3i( 5, 15, 0);
glEnd();
glBegin(GL_TRIANGLES);
/* front */
glNormal3f( 0.f, 0.f, 1.f);
glVertex3i( 0, 10, 0);
glVertex3i(10, 10, 0);
glVertex3i( 5, 15, 0);
/* back */
glNormal3f( 0.f, 0.f, -1.f);
glVertex3i( 0, 10, -20);
glVertex3i( 5, 15, -20);
glVertex3i(10, 10, -20);
glEnd();
glEndList();
glEnable(GL_CULL_FACE);
/* load pattern for current 2d texture */
cloud = read_texture("../../data/clouds.bw",
&texwid, &texht, &texcomps);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_LUMINANCE, texwid, texht, GL_RGBA,
GL_UNSIGNED_BYTE, cloud);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
free(cloud);
initpart(&psys, begin, end, 200, 6000);
updateptr = updatepart0;
CHECK_ERROR("main()");
glutMainLoop();
return 0;
}
glm::mat4 const & Camera::lookAt()
{
updateMV();
return m_modelview;
}
