void Planet::Render(const vector3d &viewCoords, const matrix4x4d &viewTransform)
{
matrix4x4d ftran = viewTransform;
vector3d fpos = viewCoords;
double rad = sbody->GetRadius();
float znear, zfar;
Pi::worldView->GetNearFarClipPlane(&znear, &zfar);
double len = fpos.Length();
int shrink = 0;
double scale = 1.0f;
double dist_to_horizon;
for (;;) {
if (len < rad) break; // player inside radius case
dist_to_horizon = sqrt(len*len - rad*rad);
if (dist_to_horizon < zfar*0.5) break;
rad *= 0.25;
fpos = 0.25*fpos;
len *= 0.25;
scale *= 4.0f;
shrink++;
}
//if (GetLabel() == "Earth") printf("Horizon %fkm, shrink %d\n", dist_to_horizon*0.001, shrink);
glPushMatrix(); // initial matrix is actually identity after a long chain of wtf
// glTranslatef(float(fpos.x), float(fpos.y), float(fpos.z));
glColor3f(1,1,1);
{
vector3d campos = fpos;
ftran.ClearToRotOnly();
campos = ftran.InverseOf() * campos;
glMultMatrixd(&ftran[0]);
glEnable(GL_NORMALIZE);
glScaled(rad, rad, rad); // rad = real_rad / scale
campos = campos * (1.0/rad); // position of camera relative to planet "model"
// translation not applied until patch render to fix jitter
m_geosphere->Render(-campos, sbody->GetRadius(), scale);
glTranslated(campos.x, campos.y, campos.z);
if (sbody->GetSuperType() == SBody::SUPERTYPE_GAS_GIANT) DrawGasGiantRings();
if (!Render::AreShadersEnabled()) DrawAtmosphere(campos);
glDisable(GL_NORMALIZE);
// if not using shader then z-buffer precision is hopeless and
// we can't place objects on the terrain without awful z artifacts
if (shrink || !Render::AreShadersEnabled()) {
glClear(GL_DEPTH_BUFFER_BIT);
}
}
glPopMatrix();
}
void Planet::SubRender(const vector3d &camPos)
{
if (GetSBody()->GetSuperType() == SBody::SUPERTYPE_GAS_GIANT) DrawGasGiantRings();
if (!Render::AreShadersEnabled()) DrawAtmosphere(camPos);
}
void Planet::Render(const vector3d &viewCoords, const matrix4x4d &viewTransform)
{
glPushMatrix();
matrix4x4d ftran = viewTransform;
vector3d fpos = viewCoords;
double rad = sbody->GetRadius();
float znear, zfar;
Pi::worldView->GetNearFarClipPlane(&znear, &zfar);
double apparent_size = rad / fpos.Length();
double len = fpos.Length();
double origLen = len;
int shrink = 0;
double scale = 1.0f;
double dist_to_horizon;
for (;;) {
if (len < rad) break; // player inside radius case
dist_to_horizon = sqrt(len*len - rad*rad);
if (dist_to_horizon < zfar*0.5) break;
rad *= 0.25;
fpos = 0.25*fpos;
len *= 0.25;
scale *= 4.0f;
shrink++;
}
//if (GetLabel() == "Earth") printf("Horizon %fkm, shrink %d\n", dist_to_horizon*0.001, shrink);
glTranslatef((float)fpos.x, (float)fpos.y, (float)fpos.z);
glColor3f(1,1,1);
if (apparent_size < 0.001) {
Render::State::UseProgram(0);
/* XXX WRONG. need to pick light from appropriate turd. */
GLfloat col[4];
glGetLightfv(GL_LIGHT0, GL_DIFFUSE, col);
// face the camera dammit
vector3d zaxis = fpos.Normalized();
vector3d xaxis = vector3d(0,1,0).Cross(zaxis).Normalized();
vector3d yaxis = zaxis.Cross(xaxis);
matrix4x4d rot = matrix4x4d::MakeInvRotMatrix(xaxis, yaxis, zaxis);
glMultMatrixd(&rot[0]);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glColor4f(col[0], col[1], col[2], 1);
glBegin(GL_TRIANGLE_FAN);
glVertex3f(0,0,0);
glColor4f(col[0],col[1],col[2],0);
const float spikerad = (float)(0.005*len + 1e1*(1.0*sbody->GetRadius()*len)/origLen);
{
/* bezier with (0,0,0) control points */
vector3f p0(0,spikerad,0), p1(spikerad,0,0);
float t=0.1f; for (int i=1; i<10; i++, t+= 0.1f) {
vector3f p = (1-t)*(1-t)*p0 + t*t*p1;
glVertex3fv(&p[0]);
}
}
{
vector3f p0(spikerad,0,0), p1(0,-spikerad,0);
float t=0.1f; for (int i=1; i<10; i++, t+= 0.1f) {
vector3f p = (1-t)*(1-t)*p0 + t*t*p1;
glVertex3fv(&p[0]);
}
}
{
vector3f p0(0,-spikerad,0), p1(-spikerad,0,0);
float t=0.1f; for (int i=1; i<10; i++, t+= 0.1f) {
vector3f p = (1-t)*(1-t)*p0 + t*t*p1;
glVertex3fv(&p[0]);
}
}
{
vector3f p0(-spikerad,0,0), p1(0,spikerad,0);
float t=0.1f; for (int i=1; i<10; i++, t+= 0.1f) {
vector3f p = (1-t)*(1-t)*p0 + t*t*p1;
glVertex3fv(&p[0]);
}
}
glEnd();
glDisable(GL_BLEND);
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
} else {
vector3d campos = -fpos;
ftran.ClearToRotOnly();
campos = ftran.InverseOf() * campos;
glMultMatrixd(&ftran[0]);
glEnable(GL_NORMALIZE);
glPushMatrix();
glScaled(rad, rad, rad);
campos = campos * (1.0/rad);
m_geosphere->Render(campos, sbody->GetRadius(), scale);
if (sbody->GetSuperType() == SBody::SUPERTYPE_GAS_GIANT) DrawGasGiantRings();
fpos = ftran.InverseOf() * fpos;
fpos *= (1.0/rad);
if (!Render::AreShadersEnabled()) DrawAtmosphere(fpos);
glPopMatrix();
glDisable(GL_NORMALIZE);
// if not using shader then z-buffer precision is hopeless and
// we can't place objects on the terrain without awful z artifacts
if (shrink || !Render::AreShadersEnabled()) {
glClear(GL_DEPTH_BUFFER_BIT);
}
}
glPopMatrix();
}
