///////////////////
// Initialize the sky
bool CSky::Initialize(void)
{
// Allocate the stars
m_psStars = new star_t[MAX_STARS];
if(m_psStars == NULL)
return false;
// Set the star details
float radius = 90;
CVec f;
for(int i=0; i<MAX_STARS; i++) {
GetAngles(-fabs(GetRandomNum()*45), 0, fabs(GetRandomNum()*360), &f, NULL, NULL);
m_psStars[i].pos = f*radius;
m_psStars[i].size = fabs(GetRandomNum());
m_psStars[i].flicker = fabs(GetRandomNum());
// Calculate the rotation
CVec p = m_psStars[i].pos;
VectorNormalize( &p );
m_psStars[i].yaw = (float)(-atan2(p.GetX(),p.GetY()) * (180/PI));
float dist = (float)sqrt((float)(p.GetX() * p.GetX() + p.GetY() * p.GetY()));
m_psStars[i].pitch = (float)(-atan2(dist,p.GetZ()) * (180/PI)+270);
}
// Load the moon texture
m_psMoonTexture = Cache_LoadTexture("data/textures/sky/moonlg.png");
if(m_psMoonTexture == NULL)
return false;
Tex_Upload(m_psMoonTexture);
// Load the star texture
m_psStarTexture = Cache_LoadTexture("data/textures/sky/star.png");
if(m_psStarTexture == NULL)
return false;
Tex_Upload(m_psStarTexture);
return true;
}
///////////////////
// Update the wheel position
void Car_UpdateWheel(carsim_t *psCar, CModel *pcTrack, int id)
{
wheel_t *w = &psCar->sWheels[id];
CVec relpos = w->cRelPos;
float p[3], t1[9], t2[9];
plane_t plane;
// Calculate the wheel 'top' pos
CVec wheelPos = psCar->X*relpos.GetX() + psCar->Y*relpos.GetY() + psCar->Z*relpos.GetZ() + psCar->cPos;
// Convert the wheel in car coords
relpos -= CVec(0,0,w->fRestLength);
w->cPos = psCar->X*relpos.GetX() + psCar->Y*relpos.GetY() + psCar->Z*relpos.GetZ() + psCar->cPos;
// This is for the rendering
w->fWheelZ = -w->fRestLength;
// Defaults
w->fSuspLength = w->fRestLength;
w->fPistonVelocity = 0;
// Check for collisions
p[0] = w->cPos.GetX(); p[1] = w->cPos.GetY(); p[2] = w->cPos.GetZ();
w->bCollision = false;
float pDist = 0;
if( pcTrack->getCDModel()->sphereCollision( p, w->fRadius ) ) {
float top=999999;
for(int n=0; n<pcTrack->getCDModel()->getNumCollisions(); n++) {
pcTrack->getCDModel()->getCollidingTriangles(n, t1,t2,false);
plane = CalculatePlane(CVec(t1[0],t1[1],t1[2]),
CVec(t1[3],t1[4],t1[5]),
CVec(t1[6],t1[7],t1[8]));
// If the normal is too great for the tyre, ignore the collision
if(DotProduct(plane.vNormal,psCar->Z) < 0.5f)
continue;
// Find the plane that is raised towards the wheel center the most
if( DotProduct(wheelPos, plane.vNormal) + plane.fDistance < top) {
// TODO: Check if the tyre is not too high (ie, over the suspension joint)
top = DotProduct(wheelPos, plane.vNormal) + plane.fDistance;
w->cNormal = plane.vNormal;
pDist = plane.fDistance;
}
w->bCollision = true;
}
}
w->fSpeed = 0;
// If not colliding, just leave
if(!w->bCollision)
return;
// Make the tyre sit on top of the road
float d = DotProduct(w->cPos, w->cNormal) + pDist;
w->fSuspLength = d;
relpos = w->cRelPos - CVec(0,0,w->fSuspLength);
w->fWheelZ = -w->fSuspLength;
w->cPos = psCar->X*relpos.GetX() + psCar->Y*relpos.GetY() + psCar->Z*relpos.GetZ() + psCar->cPos;
// Get the piston velocity for the suspension
CVec vel = CrossProduct(psCar->cPos-w->cPos, psCar->cAngVelocity) + psCar->cVelocity;
w->fPistonVelocity = (psCar->Z * DotProduct(psCar->Z,vel)).GetZ();
// Calculate the rotation speed of the tyre
CVec s = psCar->Y * DotProduct(psCar->cVelocity, psCar->Y);
w->fSpeed = VectorLength(s);
if(DotProduct(psCar->cVelocity, psCar->Y) > 0)
w->fSpin += w->fSpeed / w->fRadius;
else
w->fSpin -= w->fSpeed / w->fRadius;
// Rotation is based on the Torque from the engine
//w->fSpin += w->fTorque / w->fRadius;
// If the torque is greater then the slip torque for the surface, the wheel is slipping and the engine force
// is less
// Note: The slip torque is constant for now
if(id == 1) {
//tMainSR3.f1 = w->fTorque;
}
if(w->fTorque > 100) {
// Slipping
w->fEngineLoad = w->fTorque/50;
w->bSlip = true;
} else {
w->bSlip = false;
w->fEngineLoad = 0;
}
w->fSpin = LimitAngle(w->fSpin);
}
///////////////////
// Render the sky
void CSky::Render(CCamera *psCamera)
{
int i;
float fSize;
State_Enable(GL_TEXTURE_2D);
State_Disable(GL_FOG);
State_Disable(GL_LIGHTING);
State_Enable(GL_BLEND);
glBlendFunc(GL_ONE,GL_ONE_MINUS_SRC_COLOR);
glDepthMask(0);
// Make the sky be around the camera
glPushMatrix();
if(psCamera) {
CVec p = psCamera->getPos();
glTranslatef(p.GetX(), p.GetY(), p.GetZ());
}
// Draw the stars
Tex_Bind(m_psStarTexture);
star_t *s = m_psStars;
for(i=0; i<MAX_STARS; i++, s++) {
glPushMatrix();
glTranslatef(s->pos.GetX(), s->pos.GetY(), s->pos.GetZ());
glRotatef(s->yaw-180, 0,0,1);
glRotatef(s->pitch, 0,0,1);
float f = 1-(fabs(GetRandomNum()*0.6f) * s->flicker);
glColor4f(f,f,f,1.0f);
fSize = s->size;
glBegin(GL_QUADS);
glTexCoord2i(0,0); glVertex3f(-fSize, 0, -fSize);
glTexCoord2i(1,0); glVertex3f(fSize, 0, -fSize);
glTexCoord2i(1,1); glVertex3f(fSize, 0, fSize);
glTexCoord2i(0,1); glVertex3f(-fSize, 0, fSize);
glEnd();
glPopMatrix();
}
// Draw the moon
glColor4f(1,1,1,1);
Tex_Bind(m_psMoonTexture);
glPushMatrix();
fSize = 5.5f;
glTranslatef(-60,100,40);
glRotatef(10,0,0,1);
glBegin(GL_QUADS);
glTexCoord2i(0,0); glVertex3f(-fSize, 0, -fSize);
glTexCoord2i(1,0); glVertex3f(fSize, 0, -fSize);
glTexCoord2i(1,1); glVertex3f(fSize, 0, fSize);
glTexCoord2i(0,1); glVertex3f(-fSize, 0, fSize);
glEnd();
glPopMatrix();
glDepthMask(1);
glPopMatrix();
}
