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// Umar Arshad
// Copyright 2015-2019
//
// Modified by Pradeep Garigipati on Dec 30, 2015 for Forge
// Purpose of modification: To use the program to convert
// GLSL shader files into compile time constant string literals
#include <fstream>
#include <sstream>
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <memory>
using namespace std;
typedef map<string, string> opt_t;
static
void print_usage() {
cout << R"delimiter(GLSL2CPP
Converts OpenGL shader files to C++ headers. It is similar to bin2c and xxd but adds
support for namespaces.
| --name | name of the variable (default: var) |
| --file | input file |
| --output | output file (If no output is specified then it prints to stdout) |
| --type | Type of variable (default: char) |
| --namespace | A space seperated list of namespaces |
| --formatted | Tabs for formatting |
| --version | Prints my name |
| --help | Prints usage info |
Example
-------
Command:
./glsl2cpp --file blah.txt --namespace shaders --formatted --name image_vs
Will produce the following:
#pragma once
#include <cstddef>
namespace shaders {
static const char image_vs[] = R"shader(
#version 330
layout(location = 0) in vec3 pos;
layout(location = 1) in vec2 tex;
uniform mat4 matrix;
out vec2 texcoord;
void main() {
texcoord = tex;
gl_Position = matrix * vec4(pos,1.0);
}
)shader";
}
)delimiter";
exit(0);
}
static bool formatted;
static
void add_tabs(const int level)
{
if(formatted) {
for(int i =0; i < level; i++) {
cout << "\t";
}
}
}
static
opt_t parse_options(const vector<string>& args)
{
opt_t options;
options["--name"] = "";
options["--type"] = "";
options["--file"] = "";
options["--output"] = "";
options["--namespace"] = "";
options["--eof"] = "";
//Parse Arguments
string curr_opt;
bool verbose = false;
for(auto arg : args) {
if(arg == "--verbose") {
verbose = true;
} else if(arg == "--formatted") {
formatted = true;
} else if(arg == "--version") {
cout << args[0] << " Original Author: Umar Arshad;\n Modified later by: Pradeep Garigipati." << endl;
} else if(arg == "--help") {
print_usage();
} else if(options.find(arg) != options.end()) {
curr_opt = arg;
} else if(curr_opt.empty()) {
//cerr << "Invalid Argument: " << arg << endl;
} else {
if(options[curr_opt] != "") {
options[curr_opt] += " " + arg;
}
else {
options[curr_opt] += arg;
}
}
}
if(verbose) {
for(auto opts : options) {
cout << get<0>(opts) << " " << get<1>(opts) << endl;
}
}
return options;
}
int main(int argc, const char * const * const argv)
{
vector<string> args(argv, argv+argc);
opt_t&& options = parse_options(args);
//Save default cout buffer. Need this to prevent crash.
auto bak = cout.rdbuf();
unique_ptr<ofstream> outfile;
// Set defaults
if(options["--name"] == "") { options["--name"] = "var"; }
if(options["--output"] != "") {
//redirect stream if output file is specified
outfile.reset(new ofstream(options["--output"]));
cout.rdbuf(outfile->rdbuf());
}
cout << "#pragma once\n";
cout << "#include <string>\n"; // defines std::string
int ns_cnt = 0;
int level = 0;
if(options["--namespace"] != "") {
std::stringstream namespaces(options["--namespace"]);
string name;
namespaces >> name;
do {
add_tabs(level++);
cout << "namespace " << name << "\n{\n";
ns_cnt++;
namespaces >> name;
} while(!namespaces.fail());
}
if(options["--type"] == "") {
options["--type"] = "std::string";
}
add_tabs(level);
cout << "static const " << options["--type"] << " " << options["--name"] << " = R\"shader(\n";
level++;
ifstream input(options["--file"]);
for(std::string line; std::getline(input, line);) {
add_tabs(level);
cout << line << endl;
}
if (options["--eof"].c_str()[0] == '1') {
// Add end of file character
cout << "0x0";
}
add_tabs(--level);
cout << ")shader\";\n";
while(ns_cnt--) {
add_tabs(--level);
cout << "}\n";
}
cout.rdbuf(bak);
}
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