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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 "hitlist.h"
#include "threading.h"
#include <vector>
#include <algorithm>
#include <random>
// Antialiasing viewport
template<typename T>
class aa_viewport : public viewport<T> {
unsigned samples;
std::vector<basic_viewport<T>> *subviews;
int threads;
public:
aa_viewport(double width, double height, vec3d viewport_center, unsigned samples, int threads = -1)
: samples(samples), threads{(threads > 0) ? threads : (int)std::thread::hardware_concurrency()} {
assert(samples >= 1);
subviews = new std::vector<basic_viewport<T>>{samples, {width, height, viewport_center}};
}
~aa_viewport() {
delete subviews;
}
virtual bitmap<T> render(const hitlist &world, vec3d viewpoint, uint16_t image_width, uint16_t image_height) {
static constexpr auto seed = 123456789012345678ULL;
const unsigned thread_count = std::min((unsigned)threads, samples);
std::cerr << "Preparing tasks..." << std::endl;
std::vector<bitmap<T>> images{samples, {0, 0}};
std::mt19937_64 seedgen{seed}; // generates seeds for workers
const struct s_render_shared {
std::vector<basic_viewport<T>> &subs;
vec3d viewpoint;
uint16_t image_width;
uint16_t image_height;
const hitlist &world;
std::vector<bitmap<T>> &images;
} s_{.subs=*subviews, .viewpoint = viewpoint,
.image_width=image_width, .image_height=image_height,
.world=world, .images=images
};
struct s_render_task {
uint32_t task_id;
uint64_t seed;
uint64_t diffuse_seed;
const s_render_shared &shared;
};
thread_pool<s_render_task> pool{thread_count};
timer tim{true};
std::cerr << "Seeding tasks..." << std::endl;
tim.start_measure();
for (typeof(samples) i = 0; i < samples; ++i) {
pool.submit_task([](s_render_task &task) {
bias_ctx bc{task.seed};
auto image = task.shared.subs[task.task_id].render(
task.shared.world, task.shared.viewpoint,
task.shared.image_width, task.shared.image_height,
bc, task.diffuse_seed);
task.shared.images[task.task_id] = image;
}, s_render_task{
.task_id = i, .seed=seedgen(), .diffuse_seed=seedgen(), .shared=s_
});
}
tim.stop_measure();
std::cerr << "Finish seeding. Speed: " << 1.0 * samples / tim.duration().count() << " task/sec" << std::endl;
std::cerr << "Rendering with " << thread_count << " thread(s)." << std::endl;
tim.start_measure();
pool.start();
pool.wait();
tim.stop_measure();
std::cerr << "Finish rendering sub-pixels. Speed: " << 1.0 * tim.duration().count() / samples << "sec/image, "
<< 1.0 * samples * image_width * image_height / tim.duration().count() << " pixel/sec" << std::endl;
return bitmap<T>::average(images);
}
};
using aa_viewport8b = aa_viewport<uint8_t>;
#endif //RT_AA_H
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