static void parse_planebody( BodyMap& bodies, const TiXmlElement* elem, PlaneBody* body )
{
parse_elem( elem, true, STR_ID, &body->id );
parse_elem( elem, true, STR_POSITION, &body->position );
parse_elem( elem, true, STR_NORMAL, &body->normal );
bodies[body->id] = body;
}
static void parse_point_light( const TiXmlElement* elem, PointLight* light )
{
parse_elem( elem, false, STR_ACON, &light->attenuation.constant );
parse_elem( elem, false, STR_ALIN, &light->attenuation.linear );
parse_elem( elem, false, STR_AQUAD, &light->attenuation.quadratic );
parse_elem( elem, true, STR_POSITION, &light->position );
parse_elem( elem, true, STR_COLOR, &light->color );
}
static void parse_trianglebody( const TiXmlElement* elem, TriangleBody* body )
{
parse_elem( elem, true, STR_ID, &body->id );
parse_elem( elem, false, STR_POINTA, &body->vertices[0]);
parse_elem( elem, false, STR_POINTB, &body->vertices[1]);
parse_elem( elem, false, STR_POINTC, &body->vertices[2]);
body->position = body->vertices[0];
}
static void parse_geom_base( const MaterialMap& matmap, const TiXmlElement* elem, Geometry* geom )
{
Quaternion ori = geom->orientation;
parse_elem( elem, true, STR_POSITION, &geom->position );
parse_elem( elem, false, STR_ORIENT, &ori );
parse_elem( elem, false, STR_SCALE, &geom->scale );
// normalize orientation
geom->orientation = normalize( ori );
}
static void parse_camera( const TiXmlElement* elem, Camera* camera )
{
Quaternion ori = camera->orientation;
// note: we don't load aspect, since it's set by the application
parse_elem( elem, true, STR_FOV, &camera->fov );
parse_elem( elem, true, STR_NEAR, &camera->near_clip );
parse_elem( elem, true, STR_FAR, &camera->far_clip );
parse_elem( elem, true, STR_POSITION, &camera->position );
parse_elem( elem, true, STR_ORIENT, &ori );
// normalize orientation
camera->orientation = normalize( ori );
}
static const char* parse_triangle_vertex( const MaterialMap& matmap, const TiXmlElement* elem, Triangle::Vertex* vertex )
{
const char* name;
Vector3 normal = vertex->normal;
parse_elem( elem, true, STR_POSITION, &vertex->position );
parse_elem( elem, true, STR_NORMAL, &normal );
parse_elem( elem, true, STR_TCOORD, &vertex->tex_coord );
parse_lookup_data( matmap, elem, STR_MATERIAL, &vertex->material );
parse_attrib_string( elem, true, STR_NAME, &name );
// normalize normal
vertex->normal = normalize( normal );
return name;
}
static const char* parse_material( const TiXmlElement* elem, Material* material )
{
const char* name;
parse_attrib_string( elem, false, STR_TEXTURE, &material->texture_filename );
parse_attrib_string( elem, true, STR_NAME, &name );
parse_elem( elem, false, STR_REFRACT, &material->refractive_index );
parse_elem( elem, false, STR_AMBIENT, &material->ambient );
parse_elem( elem, false, STR_DIFFUSE, &material->diffuse );
parse_elem( elem, false, STR_SPECULAR, &material->specular );
parse_elem( elem, false, STR_SHININESS, &material->shininess );
return name;
}
static void parse_geom_sphere( const MaterialMap& matmap, const TiXmlElement* elem, Sphere* geom )
{
// parse base
parse_geom_base( matmap, elem, geom );
parse_elem( elem, true, STR_RADIUS, &geom->radius );
parse_lookup_data( matmap, elem, STR_MATERIAL, &geom->material );
}
static void parse_spherebody( const TiXmlElement* elem, SphereBody* body )
{
parse_elem( elem, true, STR_ID, &body->id );
parse_elem( elem, true, STR_MASS, &body->mass );
parse_elem( elem, false, STR_POSITION, &body->position );
parse_elem( elem, false, STR_RADIUS, &body->radius );
parse_elem( elem, false, STR_VELOCITY, &body->velocity );
parse_elem( elem, false, STR_ANGULARVELOCITY, &body->angular_velocity );
parse_elem( elem, false, STR_ORIENT, &body->orientation );
}
static void parse_camera( const TiXmlElement* elem, Camera* camera )
{
Quaternion ori;
Vector3 position;
real_t fov;
real_t nearClip;
real_t farClip;
// note: we don't load aspect, since it's set by the application
parse_elem( elem, true, STR_FOV, &fov );
parse_elem( elem, true, STR_NEAR, &nearClip );
parse_elem( elem, true, STR_FAR, &farClip );
parse_elem( elem, true, STR_POSITION, &position );
parse_elem( elem, true, STR_ORIENT, &ori );
// normalize orientation
camera->SetOrientation( normalize( ori ) );
camera->SetPosition(position);
camera->SetFarClip(farClip);
camera->SetNearClip(nearClip);
camera->SetFOV(fov);
}
static void parse_spring( BodyMap& bmap, const TiXmlElement* elem, Spring* spring )
{
int id;
parse_elem( elem, true, STR_CONSTANT, &spring->constant );
parse_elem( elem, true, STR_EQUILIBRIUM, &spring->equilibrium );
parse_elem( elem, true, STR_BODY1, &id );
spring->body1 = bmap[id];
parse_elem( elem, false, STR_OFFSET1, &spring->body1_offset );
parse_elem( elem, true, STR_BODY2, &id );
spring->body2 = bmap[id];
parse_elem( elem, false, STR_OFFSET2, &spring->body2_offset );
parse_elem( elem, false, STR_DAMPING, &spring->damping );
}
static void parse_geom_sphere( const MaterialMap& matmap, BodyMap& bodies, Physics* phys, const TiXmlElement* elem, Sphere* geom )
{
// parse base
parse_geom_base( matmap, elem, geom );
parse_elem( elem, true, STR_RADIUS, &geom->radius );
parse_lookup_data( matmap, elem, STR_MATERIAL, &geom->material );
const TiXmlElement* child = elem->FirstChildElement( STR_BODY );
if ( child ) {
SphereBody* body = new SphereBody( geom );
check_mem( body );
parse_spherebody( child, body );
bodies[body->id] = body;
phys->add_sphere(body);
}
}
// Parse a comma separated sequence of elements in
// either a tuple or a variant.
//
// elem-list ::= elem | elem-list ',' elem
Tree_seq*
parse_elem_list(Parser& p, Token_kind close_tok) {
Tree_seq* ts = new Tree_seq();
while (true) {
// Try parsing the next element.
if (Tree* t = parse_elem(p))
ts->push_back(t);
else
return nullptr;
// Either break or continue.
if (parse::next_token_is(p, close_tok))
break;
parse::expect(p, comma_tok);
}
return ts;
}
bool load_scene( Scene* scene, const char* filename )
{
TiXmlDocument doc( filename );
const TiXmlElement* root = 0;
const TiXmlElement* elem = 0;
MaterialMap materials;
MeshMap meshes;
TriVertMap triverts;
assert( scene );
// load the document
if ( !doc.LoadFile() ) {
std::cout << "ERROR, " << doc.ErrorRow() << ":" << doc.ErrorCol() << "; "
<< "parse error: " << doc.ErrorDesc() << "\n";
return false;
}
// check for root element
root = doc.RootElement();
if ( !root ) {
std::cout << "No root element.\n";
return false;
}
// reset the scene
scene->reset();
try {
// parse the camera
elem = get_unique_child( root, true, STR_CAMERA );
parse_camera( elem, &scene->camera );
// parse background color
parse_elem( root, true, STR_BACKGROUND, &scene->background_color );
// parse refractive index
parse_elem( root, true, STR_REFRACT, &scene->refractive_index );
// parse ambient light
parse_elem( root, false, STR_AMLIGHT, &scene->ambient_light );
// parse the lights
elem = root->FirstChildElement( STR_PLIGHT );
while ( elem ) {
PointLight pl;
parse_point_light( elem, &pl );
scene->add_light( pl );
elem = elem->NextSiblingElement( STR_PLIGHT );
}
// parse the materials
elem = root->FirstChildElement( STR_MATERIAL );
while ( elem ) {
Material* mat = new Material();
check_mem( mat );
scene->add_material( mat );
const char* name = parse_material( elem, mat );
assert( name );
// place each material in map by it's name, so we can associate geometries
// with them when loading geometries
// check for repeat name
if ( !materials.insert( std::make_pair( name, mat ) ).second ) {
print_error_header( elem );
std::cout << "Material '" << name << "' multiply defined.\n";
throw std::exception();
}
elem = elem->NextSiblingElement( STR_MATERIAL );
}
// parse the meshes
elem = root->FirstChildElement( STR_MESH );
while ( elem ) {
Mesh* mesh = new Mesh();
check_mem( mesh );
scene->add_mesh( mesh );
const char* name = parse_mesh( elem, mesh );
assert( name );
// place each mesh in map by it's name, so we can associate geometries
// with them when loading geometries
if ( !meshes.insert( std::make_pair( name, mesh ) ).second ) {
print_error_header( elem );
std::cout << "Mesh '" << name << "' multiply defined.\n";
throw std::exception();
}
elem = elem->NextSiblingElement( STR_MESH );
}
// parse vertices (used by triangles)
elem = root->FirstChildElement( STR_VERTEX );
while ( elem ) {
Triangle::Vertex v;
const char* name = parse_triangle_vertex( materials, elem, &v );
assert( name );
// place each vertex in map by it's name, so we can associate triangles
// with them when loading geometries
if ( !triverts.insert( std::make_pair( name, v ) ).second ) {
print_error_header( elem );
std::cout << "Triangle vertex '" << name << "' multiply defined.\n";
throw std::exception();
}
elem = elem->NextSiblingElement( STR_VERTEX );
}
// parse the geometries
// spheres
elem = root->FirstChildElement( STR_SPHERE );
while ( elem ) {
Sphere* geom = new Sphere();
check_mem( geom );
scene->add_geometry( geom );
parse_geom_sphere( materials, elem, geom );
elem = elem->NextSiblingElement( STR_SPHERE );
}
// triangles
elem = root->FirstChildElement( STR_TRIANGLE );
while ( elem ) {
Triangle* geom = new Triangle();
check_mem( geom );
scene->add_geometry( geom );
parse_geom_triangle( materials, triverts, elem, geom );
elem = elem->NextSiblingElement( STR_TRIANGLE );
}
// models
elem = root->FirstChildElement( STR_MODEL );
while ( elem ) {
Model* geom = new Model();
check_mem( geom );
scene->add_geometry( geom );
parse_geom_model( materials, meshes, elem, geom );
elem = elem->NextSiblingElement( STR_MODEL );
}
// TODO add you own geometries here
} catch ( std::bad_alloc const& ) {
std::cout << "Out of memory error while loading scene\n.";
scene->reset();
return false;
} catch ( ... ) {
scene->reset();
return false;
}
return true;
}