58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#include <limits>
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#include <cstdlib>
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#include <cmath>
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#include <omp.h>
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#include "tracer.hpp"
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using namespace std;
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static const vec3 BCKG_COLOR = vec3(0.16f, 0.66f, 0.72f);
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static inline float random01() {
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return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
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}
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Tracer::Tracer(): m_h(640), m_w(480), m_fov(90.0f), m_a_ratio(640.0f / 480.0f) {}
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Tracer::Tracer(int h, int w, float fov): m_h(h), m_w(w), m_fov(fov) {
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m_a_ratio = static_cast<float>(w) / h;
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}
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vec2 Tracer::sample_pixel(int i, int j) const {
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float pxNDC;
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float pyNDC;
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float pxS;
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float pyS;
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pyNDC = (static_cast<float>(i) + random01()) / m_h;
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pyS = (1.0f - (2.0f * pyNDC)) * tan(radians(m_fov) / 2);
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pxNDC = (static_cast<float>(j) + random01()) / m_w;
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pxS = (2.0f * pxNDC) - 1.0f;
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pxS *= m_a_ratio * tan(radians(m_fov) / 2);
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return vec2(pxS, pyS);
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}
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vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, unsigned int rec_level) const {
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float t;
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float _t;
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Figure * _f;
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vec3 n;
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t = numeric_limits<float>::max();
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_f = NULL;
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for (size_t f = 0; f < vf.size(); f++) {
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if (vf[f]->intersect(r, _t, n) && _t < t) {
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t = _t;
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_f = vf[f];
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}
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}
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if (_f != NULL)
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return _f->color;
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else
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return vec3(BCKG_COLOR);
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}
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