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#include <cstdio>
#include <cstdlib>
#include <vector>
#include "tinyexr.h"
#include "cxxopts.hpp"
int main(int argc, char** argv)
{
float min_value = -std::numeric_limits<float>::max();
float max_value = std::numeric_limits<float>::max();
float rgb_min[3] = {min_value, min_value, min_value};
float rgb_max[3] = {max_value, max_value, max_value};
cxxopts::Options options("normalmap", "help");
options.show_positional_help();
options.add_options()
("max", "Max intensity(apply all RGB channels)", cxxopts::value<float>())
("rmax", "Max Red intensity", cxxopts::value<float>())
("gmax", "Max Green intensity", cxxopts::value<float>())
("bmax", "Max Blue intensity", cxxopts::value<float>())
("min", "Min intensity(apply all RGB channels)", cxxopts::value<float>())
("rmin", "Min Red intensity", cxxopts::value<float>())
("gmin", "Min Green intensity", cxxopts::value<float>())
("bmin", "Min Blue intensity", cxxopts::value<float>())
("i,input", "Input filename", cxxopts::value<std::string>())
("o,output", "Output filename", cxxopts::value<std::string>())
("help", "Print help")
;
auto result = options.parse(argc, argv);
if (result.count("help")) {
std::cout << options.help() << std::endl;
}
if (result.count("input") == 0) {
std::cerr << "input filename missing" << std::endl;
std::cout << options.help() << std::endl;
return EXIT_FAILURE;
}
if (result.count("output") == 0) {
std::cerr << "output filename missing" << std::endl;
std::cout << options.help() << std::endl;
return EXIT_FAILURE;
}
std::string input_filename = result["input"].as<std::string>();
std::string output_filename = result["output"].as<std::string>();
if (result.count("max")) {
rgb_max[0] = result["max"].as<float>();
rgb_max[1] = result["max"].as<float>();
rgb_max[2] = result["max"].as<float>();
}
if (result.count("rmax")) {
rgb_max[0] = result["rmax"].as<float>();
}
if (result.count("gmax")) {
rgb_max[1] = result["gmax"].as<float>();
}
if (result.count("bmax")) {
rgb_max[2] = result["bmax"].as<float>();
}
if (result.count("min")) {
rgb_min[0] = result["min"].as<float>();
rgb_min[1] = result["min"].as<float>();
rgb_min[2] = result["min"].as<float>();
}
if (result.count("rmin")) {
rgb_min[0] = result["rmin"].as<float>();
}
if (result.count("gmin")) {
rgb_min[1] = result["gmin"].as<float>();
}
if (result.count("bmin")) {
rgb_min[2] = result["bmin"].as<float>();
}
float *rgba = nullptr;
int width, height;
const char *err = nullptr;
{
int ret = LoadEXR(&rgba, &width, &height, input_filename.c_str(), &err);
if (TINYEXR_SUCCESS != ret) {
std::cerr << "Failed to load EXR file [" << input_filename << "] code = " << ret << std::endl;
if (err) {
std::cerr << err << std::endl;
FreeEXRErrorMessage(err);
}
return EXIT_FAILURE;
}
}
// clip pixel values.
// ignore alpha channel for now.
std::vector<float> rgb;
rgb.resize(width * height * 3);
float v_max[3] = {
-std::numeric_limits<float>::max(),
-std::numeric_limits<float>::max(),
-std::numeric_limits<float>::max()};
float v_min[3] = {
std::numeric_limits<float>::max(),
std::numeric_limits<float>::max(),
std::numeric_limits<float>::max()};
{
for (size_t i = 0; i < width * height; i++) {
rgb[3 * i + 0] = std::max(rgb_min[0], std::min(rgb_max[0], rgba[4 * i + 0]));
rgb[3 * i + 1] = std::max(rgb_min[1], std::min(rgb_max[1], rgba[4 * i + 1]));
rgb[3 * i + 2] = std::max(rgb_min[2], std::min(rgb_max[2], rgba[4 * i + 2]));
v_max[0] = std::max(rgb[3 * i + 0], v_max[0]);
v_max[1] = std::max(rgb[3 * i + 1], v_max[1]);
v_max[2] = std::max(rgb[3 * i + 2], v_max[2]);
v_min[0] = std::min(rgb[3 * i + 0], v_min[0]);
v_min[1] = std::min(rgb[3 * i + 1], v_min[1]);
v_min[2] = std::min(rgb[3 * i + 2], v_min[2]);
}
}
std::cout << "v min = " << v_min[0] << ", " << v_min[1] << ", " << v_min[2] << std::endl;
std::cout << "v max = " << v_max[0] << ", " << v_max[1] << ", " << v_max[2] << std::endl;
{
int ret = SaveEXR(rgb.data(), width, height, /* component */3, /* fp16 */0, output_filename.c_str(), &err);
if (TINYEXR_SUCCESS != ret) {
if (err) {
std::cerr << err << std::endl;
FreeEXRErrorMessage(err);
}
std::cerr << "Failed to save EXR file [" << input_filename << "] code = " << ret << std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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