Implement input based shaders

tools/shader2c.cpp

@@ -0,0 +1,141 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <sstream>
+
+#if (!defined(_MSC_VER)) || (_MSC_VER > 1916)
+#include <filesystem>
+#else
+#include <experimental/filesystem>
+#endif
+
+#define ENUM_NAME_STR_IDENTIFIER_POS 0
+#define OPERATION_POS 1
+#define MIN_DOT_SEPARATED_STRINGS 2
+
+using namespace std;
+
+enum shader_operations { NO_OPERATION, POWER_OF_2_OPERATION };
+
+vector<string> split_str_by_char(string str_to_split, char split_char) {
+	stringstream str_stream(str_to_split);
+	vector<string> result;
+
+	while(str_stream.good())
+	{
+		string substr;
+		getline(str_stream, substr, split_char);
+		result.push_back(substr);
+	}
+	return result;
+}
+
+inline bool str_ends_with(string const &value, string const &ending)
+{
+    if(ending.size() > value.size()) return false;
+    return equal(ending.rbegin(), ending.rend(), value.rbegin());
+}
+
+int process_file(filesystem::path input_path, ofstream &output) {
+	string final_path = input_path.filename().string();
+	int first = -1;
+	int last = -1;
+	shader_operations loaded_operation = NO_OPERATION;
+
+	vector<string> dot_separated_names = split_str_by_char(final_path, '.');
+	if(dot_separated_names.size() < MIN_DOT_SEPARATED_STRINGS) {
+		cout << "Badly formatted input name!" << endl;
+		return -3;
+	}
+
+	transform(dot_separated_names[ENUM_NAME_STR_IDENTIFIER_POS].begin(), dot_separated_names[ENUM_NAME_STR_IDENTIFIER_POS].end(), dot_separated_names[ENUM_NAME_STR_IDENTIFIER_POS].begin(), ::toupper);
+
+	ifstream input(input_path, ios::in);
+	if(!input) {
+		cout << "Couldn't open input file!" << endl;
+		return -2;
+	}
+	vector<string> file_lines;
+	string single_str = "";
+	while (getline(input, single_str))
+		file_lines.push_back(single_str);
+
+	input.close();
+
+	if(dot_separated_names[OPERATION_POS].rfind("2_to_x", 0) == 0) {
+		vector<string> underscore_separated_values = split_str_by_char(final_path, '_');
+		first = stoi(underscore_separated_values[underscore_separated_values.size()-2]);
+		last = stoi(underscore_separated_values[underscore_separated_values.size()-1]);
+		loaded_operation = POWER_OF_2_OPERATION;
+	}
+
+	bool first_pass = true;
+	do {
+		if(!first_pass)
+			first += 1;
+		first_pass = false;
+		string enum_str = dot_separated_names[ENUM_NAME_STR_IDENTIFIER_POS];
+		output << "shader_strings[" << dot_separated_names[ENUM_NAME_STR_IDENTIFIER_POS];
+		if(first != -1)
+			output << "_" << first;
+		output << "] = \\" << endl;
+
+		for(int i = 0; i < file_lines.size(); i++) {
+			string line = file_lines[i];
+			if((loaded_operation == POWER_OF_2_OPERATION) && (str_ends_with(line, "= x;"))) {
+				vector<string> x_split_line = split_str_by_char(line, 'x');
+				string new_line = "";
+				for(int j = 0; j < x_split_line.size() - 1; j++) {
+					new_line += x_split_line[j];
+					if(j < x_split_line.size() - 2)
+						new_line += "x";
+				}
+				new_line += to_string((float)(1 << first)) + ";";
+				line = new_line;
+			}
+			output << "\"" << line << "\" \\" <<endl;
+		}
+		output << "\"\";" << endl;
+	} while(first != last);
+	return 0;
+}
+
+int main(int argc, char *argv[]) {
+	if(argc < 4) {
+		cout << "Usage: " << argv[0] << " shaders_folder cpp_template_file output_file_name" << endl;
+		return -1;
+	}
+
+	ifstream input(argv[2], ios::in);
+	if(!input) {
+		cout << "Couldn't open template file!" << endl;
+		return -4;
+	}
+	vector<string> file_lines;
+	string single_str = "";
+	while (getline(input, single_str))
+		file_lines.push_back(single_str);
+
+	input.close();
+
+	ofstream output(argv[3], ios::out);
+	if(!output) {
+		cout << "Couldn't open output cpp file!" << endl;
+		return -5;
+	}
+	for(int i = 0; i < file_lines.size(); i++)
+		output << file_lines[i] << endl;
+
+	for(const auto & entry : filesystem::directory_iterator(argv[1])) {
+		int result = process_file(entry.path(), output);
+		if(result != 0)
+			return result;
+	}
+	output<<"}"<<endl;
+
+	output.close();
+
+	return 0;
+}