EntityNode* LTree::generate() {
std::string rule = prop.rules[prop.startRule];
rule = evalRule(rule, prop.iterations - 1);
EntityNode *modelData = new EntityNode();
modelData->vertices = new std::vector<Verts*>();
GLuint woodtex;
glGenTextures(1, &woodtex);
glBindTexture(GL_TEXTURE_2D, woodtex);
int w, h;
unsigned char *img = SOIL_load_image("Resources/Textures/treebark.jpg", &w, &h, 0, SOIL_LOAD_RGB);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
modelData->drawData.texture = new Texture(woodtex);
std::vector<CylinderMesh*>* raw = draw(rule);
for( int i = 0; i < raw->size(); ++i ) {
Verts *mesh = (*raw)[i]->ExportGLTriangleStrip();
modelData->vertices->push_back(mesh);
}
return modelData;
}
std::string LTree::evalRule(std::string &rule, int iteration) {
if (iteration > 0) {
for (std::size_t i = 0; i < rule.length(); ++i) {
if (prop.rules.count(rule[i])) {
char key = rule[i];
rule.replace(i, 1, prop.rules[key]);
int len = prop.rules[key].length() - 1;
i += len;
}
}
rule = evalRule(rule, iteration - 1);
}
return rule;
}
/**
* Evaluates each rule of the list
*/
static Tree evalRuleList(Tree rules, Tree env)
{
//cerr << "evalRuleList "<< *rules << " in " << *env << endl;
if (isNil(rules)) return gGlobal->nil;
else return cons(evalRule(hd(rules), env), evalRuleList(tl(rules), env));
}
