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//
// Created by Keuin on 2022/4/13.
//
#ifndef RT_AA_H
#define RT_AA_H
#include "vec.h"
#include "viewport.h"
#include <vector>
#include <thread>
// Antialiasing viewport
template<typename T>
class aa_viewport : public viewport<T> {
unsigned samples;
std::vector<basic_viewport<T>> subviews;
public:
aa_viewport(double width, double height, vec3d viewport_center, unsigned samples) : samples(samples) {
assert(samples >= 1);
subviews = std::vector<basic_viewport<T>>{samples, {width, height, viewport_center}};
}
virtual bitmap<T> render(const hitlist<T> &world, vec3d viewpoint, uint16_t image_width, uint16_t image_height) {
// // TODO threaded rendering
// std::vector<std::thread> workers{samples};
// for (size_t i = 0; i < samples; ++i) {
// const auto &th = workers[i];
// const auto &vw = subviews[i];
// }
const auto seed = 123456789012345678ULL;
std::mt19937_64 seedgen{seed}; // generates seeds for workers
std::vector<bitmap<T>> images{};
for (const auto &view: subviews) {
bias_ctx bc{seedgen()};
images.push_back(view.render(world, viewpoint, image_width, image_height, bc));
}
return bitmap<T>::average(images);
}
};
using aa_viewport8b = aa_viewport<uint8_t>;
#endif //RT_AA_H
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