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//
// Created by Keuin on 2022/4/11.
//
#include <cstdint>
#include <iostream>
#include <vector>
#include <memory>
#include <cstdlib>
#include "vec.h"
#include "timer.h"
#include "viewport.h"
#include "hitlist.h"
#include "sphere.h"
#define DEMO_BALL
void generate_image(uint16_t image_width, uint16_t image_height, double viewport_width, double focal_length,
double sphere_z, double sphere_r, const std::string &caption = "", unsigned caption_scale = 1) {
double r = 1.0 * image_width / image_height;
basic_viewport vp{viewport_width, viewport_width / r, vec3d{0, 0, -focal_length}};
hitlist world;
bias_ctx bias{false, 0};
world.add_object(std::make_shared<sphere>(
vec3d{0, -100.5, -1},
100)); // the earth
world.add_object(std::make_shared<sphere>(vec3d{0, 0, sphere_z}, sphere_r));
timer tm;
tm.start_measure();
auto image = vp.render(world, vec3d::zero(),
image_width, image_height, bias); // camera position as the coordinate origin
tm.stop_measure();
if (!caption.empty()) {
image.print(caption,
pixel8b::from_normalized(1.0, 0.0, 0.0),
10, 10, caption_scale, 0.8);
}
if (!std::getenv("NOPRINT")) {
image.write_plain_ppm(std::cout);
} else {
std::cerr << "NOPRINT is defined. PPM Image won't be printed." << std::endl;
}
}
int main(int argc, char **argv) {
if (argc != 7 && argc != 8) {
printf("Usage: %s <image_width> <image_height> <viewport_width> <focal_length> <sphere_z> <sphere_r>\n",
argv[0]);
return 0;
}
std::string iw{argv[1]}, ih{argv[2]}, vw{argv[3]}, fl{argv[4]}, sz{argv[5]}, sr{argv[6]}, cap{};
if (argc == 8) {
// with caption
cap = std::string{argv[7]};
}
const auto image_width = std::stoul(iw);
generate_image(image_width, std::stoul(ih),
std::stod(vw), std::stod(fl),
std::stod(sz), std::stod(sr), cap,
std::max((int) (1.0 * image_width * 0.015 / 8), 1));
}
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