static void loadShader(const char* fname, gl::Shader& shader) {
std::vector<std::string> filenames;
std::string source;
preprocessFile(source, fname, filenames);
shader.setSource(source.c_str());
shader.compile();
if (!shader.compileSuccess()) {
for (unsigned int i = 0; i < filenames.size(); ++i) {
std::cerr << '(' << i << "): " << filenames[i] << '\n';
}
shader.printInfoLog(std::cerr);
}
}
static void preprocessFile(std::string& source, const std::string& fname, std::vector<std::string>& file_list) {
static const std::string shader_path("data/shaders/");
std::ifstream f(shader_path + fname);
if (!f) {
source.append("#error File not found: ");
source.append(fname);
source.append(".\n");
}
unsigned int file_n = file_list.size();
file_list.push_back(fname);
if (file_n > 0) {
source.append("#line 1 ");
source.append(std::to_string((unsigned long long)file_n));
source.push_back('\n');
}
std::string line;
unsigned int line_n = 1;
while (std::getline(f, line)) {
line_n += 1;
if (line.substr(0, 8) == "#include") {
std::smatch results;
if (std::regex_match(line, results, include_re)) {
preprocessFile(source, results[1].str(), file_list);
source.append("#line ");
source.append(std::to_string((unsigned long long)line_n));
source.push_back(' ');
source.append(std::to_string((unsigned long long)file_n));
source.push_back('\n');
} else {
source.append("#error Malformed include directive.\n");
}
} else {
source.append(line);
source.push_back('\n');
}
}
}
/**
* Reads the style template info stored in the given (XML) file and creates style templates (OpenGL display lists).
* Existing templates remain where they are but are replaced if a new definition with an existing name is found.
*
* @param filename The name of the file to load.
* @param variables A set of name/value pairs to be replaced in the xml text.
* @return Returns GC_NO_ERROR if everything was ok, otherwise an error code.
*/
TGCError CGenericCanvas::addStylesFromFile(const char* filename, map<wstring, wstring>& variables)
{
TGCError result = GC_NO_ERROR;
xmlNodePtr root, current;
CSVGParser parser;
xmlDocPtr document = NULL;
string currentDir = getCurrentDir();
if (!variables.empty())
{
char *data;
size_t length;
data= preprocessFile(filename, variables, length);
if (data)
{
document = xmlParseMemory(data, (int) length);
free(data);
}
}
else
document = xmlParseFile(utf8ToANSI(filename).c_str());
if (document == NULL)
return GC_XML_PARSE_ERROR;
root = xmlDocGetRootElement(document);
if (root == NULL)
{
xmlFreeDoc(document);
error(this, "XML Error: Template file is empty.");
return GC_XML_EMPTY_DOCUMENT;
}
if (!XML_IS(root, "gc-styles"))
{
xmlFreeDoc(document);
error(this, "XML Error: Template file invalid.");
return GC_XML_INVALID_DOCUMENT;
}
// Switch to the directory of the given file. This is necessary to make relative file names working.
string path = extractFilePath(filename);
setCurrentDir(path);
// Parse description elements.
glMatrixMode(GL_MODELVIEW);
current = root->children;
while (current != NULL)
{
// Be flexible, ignore any unknown layout entries.
if (XML_IS(current, "style-definition"))
{
parser.parseDefinition(current, FModel);
}
else
if (XML_IS(current, "texture"))
{
// Adds a new texture to the texture list.
parseTextureEntry(current, FModel);
checkError();
};
current = current->next;
}
setCurrentDir(currentDir);
xmlFreeDoc(document);
return result;
}
