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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"
#include "aa.h"
#include "material_diffusive.h"
#include "material_reflective.h"
// Select the scene to render
//#define SCENE_DIFFUSE
#define SCENE_REFLECT
// T: intermediate color depth
template<typename T>
void generate_image(uint16_t image_width, uint16_t image_height, double viewport_width, double focal_length,
double sphere_z, double sphere_r, unsigned samples, const std::string &caption = "",
unsigned caption_scale = 1) {
if (samples == 1) {
std::cerr << "Antialiasing is disabled." << std::endl;
} else {
std::cerr << "Antialiasing Samples: " << samples << std::endl;
}
std::cerr << "Initializing context..." << std::endl;
double r = 1.0 * image_width / image_height;
viewport<T> *vp;
if (samples == 1) {
vp = new basic_viewport<T>{viewport_width, viewport_width / r, vec3d{0, 0, -focal_length}};
} else {
vp = new aa_viewport<T>{viewport_width, viewport_width / r, vec3d{0, 0, -focal_length}, samples};
}
hitlist world;
#ifdef SCENE_DIFFUSE
material_diffuse_lambertian materi{0.5};
world.add_object(std::make_shared<sphere>(
vec3d{0, -100.5, -1},
100, materi)); // the earth
world.add_object(std::make_shared<sphere>(vec3d{0, 0, sphere_z}, sphere_r, materi));
#endif
#ifdef SCENE_REFLECT
material_diffuse_lambertian m_ground{{0.8, 0.8, 0.0}};
material_diffuse_lambertian m_ball_center{{0.7, 0.3, 0.3}};
material_reflective m_ball_left{{0.8, 0.8, 0.8}};
material_reflective m_ball_right{{0.8, 0.6, 0.2}};
// the earth
world.add_object(std::make_shared<sphere>(vec3d{0.0, -100.5, -1.0}, 100.0, m_ground));
// three balls
world.add_object(std::make_shared<sphere>(vec3d{-1.0, 0.0, -1.0}, 0.5, m_ball_left));
world.add_object(std::make_shared<sphere>(vec3d{0.0, 0.0, -1.0}, 0.5, m_ball_center));
world.add_object(std::make_shared<sphere>(vec3d{1.0, 0.0, -1.0}, 0.5, m_ball_right));
#endif
timer tm;
std::cerr << "Rendering..." << std::endl;
tm.start_measure();
auto image = vp->render(world, vec3d::zero(),
image_width, image_height); // camera position as the coordinate origin
tm.stop_measure();
std::cerr << "Applying gamma2..." << std::endl;
tm.start_measure();
image = image.gamma2(); // gamma correction
tm.stop_measure();
if (!caption.empty()) {
image.print(caption,
pixel<T>::from_normalized(1.0, 0.0, 0.0),
10, 10, text_policy::newline, caption_scale, 0.8);
}
const auto image8b = bitmap8b::from<T>(image);
if (!std::getenv("NOPRINT")) {
image8b.write_plain_ppm(std::cout);
} else {
std::cerr << "NOPRINT is defined. PPM Image won't be printed." << std::endl;
}
delete vp;
}
int main(int argc, char **argv) {
if (argc != 8 && argc != 9) {
printf("Usage: %s <image_width> <image_height> <viewport_width> <focal_length> <sphere_z> <sphere_r> <samples> [<caption>]\n",
argv[0]);
return 0;
}
#ifndef NDEBUG
std::cerr << "Notice: assertion is enabled." << std::endl;
#endif
std::string iw{argv[1]}, ih{argv[2]}, vw{argv[3]}, fl{argv[4]},
sz{argv[5]}, sr{argv[6]}, sp{argv[7]}, cap{};
if (argc == 9) {
// with caption
cap = std::string{argv[8]};
}
const auto image_width = std::stoul(iw);
generate_image<uint16_t>(image_width, std::stoul(ih),
std::stod(vw), std::stod(fl),
std::stod(sz), std::stod(sr),
std::stoul(sp), cap,
std::max((int) (1.0 * image_width * 0.015 / 8), 1));
}
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