91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
#include <iostream>
|
|
#include <limits>
|
|
#include <cstdlib>
|
|
#include <cmath>
|
|
|
|
#include <omp.h>
|
|
|
|
#include "tracer.hpp"
|
|
|
|
#define PI 3.14159265358979f
|
|
|
|
using namespace std;
|
|
|
|
using std::numeric_limits;
|
|
using glm::normalize;
|
|
using glm::radians;
|
|
using glm::dot;
|
|
|
|
static const vec3 BCKG_COLOR = vec3(0.16f, 0.66f, 0.72f);
|
|
|
|
static inline float max(float a, float b) {
|
|
return a >= b ? a : b;
|
|
}
|
|
|
|
static inline float random01() {
|
|
return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
|
|
}
|
|
|
|
Tracer::Tracer(): m_h(640), m_w(480), m_fov(90.0f), m_a_ratio(640.0f / 480.0f) {}
|
|
|
|
Tracer::Tracer(int h, int w, float fov): m_h(h), m_w(w), m_fov(fov) {
|
|
m_a_ratio = static_cast<float>(w) / h;
|
|
}
|
|
|
|
vec2 Tracer::sample_pixel(int i, int j) const {
|
|
float pxNDC;
|
|
float pyNDC;
|
|
float pxS;
|
|
float pyS;
|
|
pyNDC = (static_cast<float>(i) + random01()) / m_h;
|
|
pyS = (1.0f - (2.0f * pyNDC)) * tan(radians(m_fov) / 2);
|
|
pxNDC = (static_cast<float>(j) + random01()) / m_w;
|
|
pxS = (2.0f * pxNDC) - 1.0f;
|
|
pxS *= m_a_ratio * tan(radians(m_fov) / 2);
|
|
|
|
return vec2(pxS, pyS);
|
|
}
|
|
|
|
vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, unsigned int rec_level) const {
|
|
size_t f_index;
|
|
float t, _t, n_dot_l;
|
|
Figure * _f;
|
|
vec3 n, color, i_pos;
|
|
Ray sr;
|
|
bool vis;
|
|
|
|
t = numeric_limits<float>::max();
|
|
_f = NULL;
|
|
|
|
for (size_t f = 0; f < vf.size(); f++) {
|
|
if (vf[f]->intersect(r, _t) && _t < t) {
|
|
t = _t;
|
|
_f = vf[f];
|
|
f_index = f;
|
|
}
|
|
}
|
|
|
|
if (_f != NULL) {
|
|
i_pos = r.m_origin + (t * r.m_direction);
|
|
n = _f->normal_at_int(r, t);
|
|
|
|
for (size_t l = 0; l < vl.size(); l++) {
|
|
vis = true;
|
|
sr = Ray(vl[l]->m_position, i_pos);
|
|
|
|
for (size_t f = 0; f < vf.size(); f++) {
|
|
if (f != f_index && vf[f]->intersect(sr, _t)) {
|
|
vis = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
n_dot_l = max(dot(n, vl[l]->m_position), 0.0);
|
|
color += (vis ? 1.0f : 0.0f) * (_f->color / PI) * vl[l]->m_diffuse * n_dot_l;
|
|
}
|
|
|
|
return color;
|
|
} else
|
|
return vec3(BCKG_COLOR);
|
|
}
|