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void myDisplayFunc()
{
// Nettoyage du "Tampon Chromatique" et du "Z buffer"
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(xPos ,yPos, zPos, xPos+cos(camAngle), yPos-0.2f, zPos+sin(camAngle), 0, 1, 0);
glPushMatrix();
renderScene();
glPopMatrix();
glFlush();
glutSwapBuffers();
}//myDisplayFunc()
void renderScene() {
if (mode == GL_SELECT) {
startPicking(mouse_x, mouse_y);
}
gluLookAt(xPos ,yPos, zPos, xPos+cos(camAngle), yPos-0.2f, zPos+sin(camAngle), 0, 1, 0);
glLoadIdentity();
Draw2();
if (mode == GL_SELECT)
stopPicking();
}
void startPicking(int x, int y) {
GLint viewport[4];
float ratio;
glGetIntegerv(GL_VIEWPORT,viewport);
glSelectBuffer(BUFSIZE,selectBuf);
glRenderMode(GL_SELECT);
glInitNames();
// creation de la matrice de selection
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y), 5.0, 5.0, viewport);
gluPerspective(45.0f,(GLfloat)w/(GLfloat)h,0.1f,1000.0f);
glMatrixMode(GL_MODELVIEW);
}
void stopPicking() {
glMatrixMode(GL_PROJECTION);
glPopMatrix();
hits = glRenderMode(GL_RENDER);
if (hits != 0){
processHits2(hits,selectBuf,0);
}
mode = GL_RENDER;
}
void Draw2(){
glLoadName(1);
glPushMatrix();
glTranslatef(-0.5,0,0);
DrawObjet(1) ;
glPopMatrix();
glPopName();
glLoadName(2);
glPushMatrix();
glTranslatef(0.5,0,0);
DrawObjet(2) ;
glPopName();
glPopMatrix();
} |
