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ConfigReader.cpp
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ConfigReader.cpp
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#include "ConfigReader.h"
#include <fstream>
#include <iostream>
#include <sstream>
#include <algorithm>
#include "Plane.h"
#include "Rectangle.h"
#include "Sphere.h"
namespace RayTracer {
Config ConfigReader::readConfig(const std::string& path)
{
std::ifstream configStream {path, std::ios::in};
if (!configStream.is_open())
{
std::cout << "Cannot open " << path << "!" << std::endl;
exit(1);
}
Config config;
std::string line;
while (getSanitizedLine(configStream, line))
{
if (line.empty() || line.front() == '#') continue;
switch (line.front())
{
case 'o':
if (!getSanitizedLine(configStream, line)) continue;
config.outputPath = line;
break;
case 'x':
{
if (!getSanitizedLine(configStream, line)) continue;
auto resolution = splitString(line);
if (isInvalid(resolution.x)) {
std::cout << "No resolution was given!" << std::endl;
exit(1);
}
config.resolutionX = static_cast<unsigned>(resolution[0]);
config.resolutionY = isInvalid(resolution[1]) ? config.resolutionX : static_cast<unsigned>(resolution[1]);
}
break;
case 'f':
{
if (!getSanitizedLine(configStream, line)) continue;
auto numSamples = splitString(line);
config.numSamples = isInvalid(numSamples[0]) ? 1 : static_cast<unsigned>(numSamples[0]);
}
break;
case 'b':
{
if (!getSanitizedLine(configStream, line)) continue;
auto maxBounces = splitString(line);
config.maxBounces = isInvalid(maxBounces[0]) ? 1 : static_cast<unsigned>(maxBounces[0]);
}
break;
case 'p':
{
if (!getSanitizedLine(configStream, line)) continue;
auto metalness = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto color = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto origin = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto normal = splitString(line);
config.objects.emplace_back(std::make_unique<Plane>(origin, normal, color, metalness[0]));
}
break;
case 'r':
{
if (!getSanitizedLine(configStream, line)) continue;
auto metalness = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto color = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto lowerLeft = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto lowerRight = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto upperLeft = splitString(line);
config.objects.emplace_back(std::make_unique<Rectangle>(lowerLeft, lowerRight, upperLeft, color, metalness[0]));
}
break;
case 's':
{
if (!getSanitizedLine(configStream, line)) continue;
auto metalness = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto color = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto center = splitString(line);
if (!getSanitizedLine(configStream, line)) continue;
auto radius = splitString(line);
config.objects.emplace_back(std::make_unique<Sphere>(center, radius[0], color, metalness[0]));
}
break;
default:
break;
}
}
configStream.close();
return config;
}
glm::vec3 ConfigReader::splitString(const std::string& input)
{
std::stringstream stream {input};
std::vector<float> output;
std::string segment;
while (getline(stream, segment, ' '))
{
output.emplace_back(std::stof(segment));
}
switch (output.size()) {
case 3:
return glm::vec3{output[0], output[1], output[2]};
case 2:
return glm::vec3{output[0], output[1], std::numeric_limits<float>::infinity()};
case 1:
return glm::vec3{output[0], std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()};
default:
return glm::vec3{std::numeric_limits<float>::infinity()};
}
}
bool ConfigReader::isInvalid(const float value) {
return value == std::numeric_limits<float>::infinity();
}
std::ifstream & ConfigReader::getSanitizedLine(std::ifstream &stream, std::string &string) {
getline(stream, string);
// Remove all control characters
string.erase(std::remove_if(string.begin(), string.end(), [](char c) { return std::iscntrl(c); } ), string.end());
return stream;
}
} // RayTracer