59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
|
//
|
||
|
|
// Created by goksu on 2/25/20.
|
||
|
|
//
|
||
|
|
|
||
|
|
#include <fstream>
|
||
|
|
#include "Scene.hpp"
|
||
|
|
#include "Renderer.hpp"
|
||
|
|
#include <thread>
|
||
|
|
#include <mutex>
|
||
|
|
|
||
|
|
inline float deg2rad(const float& deg) { return deg * M_PI / 180.0; }
|
||
|
|
|
||
|
|
const float EPSILON = 0.00001;
|
||
|
|
|
||
|
|
// The main render function. This where we iterate over all pixels in the image,
|
||
|
|
// generate primary rays and cast these rays into the scene. The content of the
|
||
|
|
// framebuffer is saved to a file.
|
||
|
|
void Renderer::Render(const Scene& scene)
|
||
|
|
{
|
||
|
|
std::vector<Vector3f> framebuffer(scene.width * scene.height);
|
||
|
|
|
||
|
|
float scale = tan(deg2rad(scene.fov * 0.5));
|
||
|
|
float imageAspectRatio = scene.width / (float)scene.height;
|
||
|
|
Vector3f eye_pos(278, 273, -800);
|
||
|
|
int m = 0;
|
||
|
|
|
||
|
|
// change the spp value to change sample ammount
|
||
|
|
int spp = 512;
|
||
|
|
std::cout << "SPP: " << spp << "\n";
|
||
|
|
for (uint32_t j = 0; j < scene.height; ++j) {
|
||
|
|
for (uint32_t i = 0; i < scene.width; ++i) {
|
||
|
|
// generate primary ray direction
|
||
|
|
float x = (2 * (i + 0.5) / (float)scene.width - 1) *
|
||
|
|
imageAspectRatio * scale;
|
||
|
|
float y = (1 - 2 * (j + 0.5) / (float)scene.height) * scale;
|
||
|
|
|
||
|
|
Vector3f dir = normalize(Vector3f(-x, y, 1));
|
||
|
|
for (int k = 0; k < spp; k++){
|
||
|
|
framebuffer[m] += scene.castRay(Ray(eye_pos, dir), 0) / spp;
|
||
|
|
}
|
||
|
|
m++;
|
||
|
|
}
|
||
|
|
UpdateProgress(j / (float)scene.height);
|
||
|
|
}
|
||
|
|
UpdateProgress(1.f);
|
||
|
|
|
||
|
|
// save framebuffer to file
|
||
|
|
FILE* fp = fopen("binary.ppm", "wb");
|
||
|
|
(void)fprintf(fp, "P6\n%d %d\n255\n", scene.width, scene.height);
|
||
|
|
for (auto i = 0; i < scene.height * scene.width; ++i) {
|
||
|
|
static unsigned char color[3];
|
||
|
|
color[0] = (unsigned char)(255 * std::pow(clamp(0, 1, framebuffer[i].x), 0.6f));
|
||
|
|
color[1] = (unsigned char)(255 * std::pow(clamp(0, 1, framebuffer[i].y), 0.6f));
|
||
|
|
color[2] = (unsigned char)(255 * std::pow(clamp(0, 1, framebuffer[i].z), 0.6f));
|
||
|
|
fwrite(color, 1, 3, fp);
|
||
|
|
}
|
||
|
|
fclose(fp);
|
||
|
|
}
|