127 lines
2.1 KiB
C++
127 lines
2.1 KiB
C++
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/* scene.c
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*
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* Definition of Scene-related functions.
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*
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* Eryn Wells <eryn@erynwells.me>
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*/
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#include <cmath>
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#include "basics.h"
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#include "object.h"
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#include "scene.h"
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Scene::Scene()
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: height(640), width(480),
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pixels(NULL)
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{ }
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Scene::~Scene()
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{
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if (pixels != NULL) {
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delete[] pixels;
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_is_rendered = false;
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}
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}
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bool
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Scene::is_rendered()
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const
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{
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return _is_rendered;
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}
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/*
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* scene_load --
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*
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* Load scene objects into this Scene from the given file.
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*/
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void
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Scene::read(FILE *file)
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{ }
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/*
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* scene_save --
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*
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* Write a rendered scene to the given file.
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*/
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void
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Scene::write(FILE *file)
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{ }
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/*
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* Scene::render --
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*
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* Render the given Scene.
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*/
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void
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Scene::render()
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{
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pixels = new Color[width * height];
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if (pixels == NULL) {
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// TODO: Print an error.
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return;
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}
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Ray primary_ray;
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Vector3 o, d;
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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// Assemble a ray and trace it.
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o = Vector3(x, y, -1000);
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d = Vector3(0, 0, 1);
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d.normalize();
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primary_ray = Ray(o, d);
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pixels[y * width + x] = trace_ray(primary_ray, 0);
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}
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}
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_is_rendered = true;
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}
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void
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Scene::add_shape(Shape *shape)
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{
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shapes.push_back(shape);
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}
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Color
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Scene::trace_ray(const Ray &ray, const int depth)
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{
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Color out_color = Color::Black;
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// Find intersections of this ray with objects in the scene.
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Shape *intersected_shape = NULL;
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float *t = NULL;
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float nearest_t = INFINITY;
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int nints;
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for (Shape *s : shapes) {
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nints = s->does_intersect(ray, &t);
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if (nints > 0) {
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for (int i = 0; i < nints; i++) {
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if (t[i] < nearest_t) {
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intersected_shape = s;
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nearest_t = t[i];
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}
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}
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delete[] t;
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}
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}
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// If there was no intersection, return black.
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if (intersected_shape == NULL) {
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return out_color;
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}
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// TODO: Lighting.
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return Color::Red;
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}
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