Object3D* SceneParser::parseObject(char token[MAX_PARSER_TOKEN_LENGTH]) {
Object3D *answer = NULL;
if (!strcmp(token, "Group")) {
answer = (Object3D*)parseGroup();
}
else if (!strcmp(token, "Sphere")) {
answer = (Object3D*)parseSphere();
}
else if (!strcmp(token, "Plane")) {
answer = (Object3D*)parsePlane();
}
else if (!strcmp(token, "Triangle")) {
answer = (Object3D*)parseTriangle();
}
else if (!strcmp(token, "TriangleMesh")) {
answer = (Object3D*)parseTriangleMesh();
}
else if (!strcmp(token, "Transform")) {
answer = (Object3D*)parseTransform();
}
else {
printf("Unknown token in parseObject: '%s'\n", token);
exit(0);
}
return answer;
}
void SceneParser::parseObjects(void)
{
if(currentToken == Scanner::StreamDone)
return;
else{
while(errorFlag == false && currentToken != Scanner::StreamDone)
{
acceptToken(Scanner::Id);
string tokenText = scanner.tokenText();
if(tokenText == "sphere")
parseSphere();
else if(tokenText == "box")
parseBox();
else if(tokenText == "plane")
parsePlane();
else if(tokenText == "triangle")
parseTriangle();
else if(tokenText == "mesh")
parseMesh();
else if(tokenText == "cone")
parseCone();
else if(tokenText == "cylinder")
parseCylinder();
else if(tokenText == "pointlight")
parsePointLight();
else if(tokenText == "directionallight")
parseDirectionalLight();
else if(tokenText == "spotlight")
parseSpotlight();
else if(tokenText == "arealight")
parseAreaLight();
else{
error("undefined command: " + tokenText);
}
advance();
}
}
}
Scene parseFile( std::string filename )
{
Scene scene;
int maxSpheres = 1000;
int maxTriangles = 1000;
int maxPlanes = 1000;
int maxPointLights = 10;
scene.numPointLights = 0;
scene.numSpheres = 0;
scene.numTriangles = 0;
scene.numPlanes = 0;
scene.spheres = (Sphere *)malloc( sizeof(Sphere) * maxSpheres );
scene.triangles = (Triangle *)malloc( sizeof(Triangle) * maxTriangles );
scene.planes = (Plane *)malloc( sizeof(Plane) * maxSpheres );
scene.pointLights = (PointLight *)malloc( sizeof(PointLight) * maxPointLights );
//Open file for writing
FILE *file = fopen(filename.c_str(), "r");
if(file == NULL)
{
printf("Error Occured opening file\n");
exit(EXIT_FAILURE);
}
while(1)
{
//starting off eating all whitespace
char cur = ' ';
while( isspace(cur) )
{
if( fscanf( file, "%c", &cur ) == EOF )
{
printf("End of File reached\n");
return scene;
}
}
//check for comment
if(cur == '/')
{
while(cur != '\n')
{
if( fscanf( file, "%c", &cur ) == EOF )
{
printf("Error Occured reading file\n");
exit(EXIT_FAILURE);
}
}
}
else if( cur == 'c' || cur == 'C' )
{
scene.camera = parseCamera( file );
}
else if( cur == 'l' || cur == 'L' )
{
PointLight light = parsePointLight( file );
if( scene.numPointLights + 1 >= maxPointLights )
{
maxPointLights = maxPointLights*10;
scene.pointLights = (PointLight *)realloc( scene.pointLights, sizeof(PointLight)*maxPointLights );
}
scene.pointLights[scene.numPointLights] = light;
scene.numPointLights++;
}
else if( cur == 's' || cur == 'S' )
{
if( scene.numSpheres+1 >= maxSpheres )
{
maxSpheres = maxSpheres*1000;
scene.spheres = (Sphere *) realloc( scene.spheres, sizeof(Sphere) * maxSpheres );
}
scene.spheres[scene.numSpheres] = parseSphere(file);
scene.numSpheres++;
}
else if( cur == 'p' || cur == 'P' )
{
if( scene.numPlanes+1 >= maxPlanes )
{
maxPlanes = maxPlanes*1000;
scene.planes = (Plane *) realloc( scene.planes, maxPlanes * sizeof(Plane) );
}
scene.planes[scene.numPlanes] = parsePlane(file);
scene.numPlanes++;
}
else if( cur == 't' || cur == 'T' )
{
if( scene.numTriangles+1 >= maxTriangles )
{
maxTriangles = maxTriangles*1000;
scene.triangles = (Triangle *) realloc( scene.triangles, maxTriangles * sizeof(Triangle) );
}
scene.triangles[scene.numTriangles] = parseTriangle(file);
scene.numTriangles++;
}
else
{
printf("Unknown Keyword Failure char was |%c|\n", cur);
exit(EXIT_FAILURE);
}
}
}
