Color Color::operator * (const float rhs) const {
Color mul_color(red_ * rhs,
green_ * rhs,
blue_ * rhs,
alpha_ * rhs);
return mul_color;
}
Graphic_base::Color& Graphic_base::Color::operator*=(double coeff) {
mul_color(coeff);
return *this;
}
void
render_scene(const Scene * const scene,
const Camera * const camera,
Canvas * canvas,
const int num_threads) {
const int w = canvas->w;
const int h = canvas->h;
const Float dx = w / 2.0;
const Float dy = h / 2.0;
const Float focus = camera->proj_plane_dist;
// TODO: consider possibility to define these OpenMP parameters
// in declarative style (using directives of preprocessor)
omp_set_num_threads((num_threads < 2) ? 1 : num_threads);
#ifdef RAY_INTERSECTIONS_STAT
// intersections_per_ray is not atomic variable
// avoid multithreaded rendering to prevent from race-conditions
// in case of incrementing this variable
omp_set_num_threads(1);
intersections_per_ray = 0;
#endif // RAY_INTERSECTIONS_STAT
int i;
int j;
#pragma omp parallel private(i, j)
#pragma omp for collapse(2) schedule(dynamic, CHUNK)
for(i = 0; i < w; i++) {
for(j = 0; j < h; j++) {
const Float x = i - dx;
const Float y = j - dy;
const Vector3d ray = vector3df(x, y, focus);
const Color col = trace(scene, camera, ray);
set_pixel(i, j, col, canvas);
}
}
// TODO: argument of the function? global variable?
const int antialiasing = ANTIALIASING;
if(antialiasing) {
Canvas * edges = detect_edges_canvas(canvas, num_threads);
#pragma omp parallel private(i, j)
#pragma omp for collapse(2) schedule(dynamic, CHUNK)
for(i = 1; i < w - 1; i++) {
for(j = 1; j < h - 1; j++) {
// edges canvas is grayscaled
// it means that color components (r, g, b) are equal
Byte gray = get_pixel(i, j, edges).r;
// TODO: improve
if(gray > 10) {
const Float x = i - dx;
const Float y = j - dy;
Color c = get_pixel(i, j, canvas);
const Float weight = 1.0 / 4;
c = mul_color(c, weight);
c = add_colors(c, mul_color(trace(scene, camera, vector3df(x + 0.5, y, focus)), weight));
c = add_colors(c, mul_color(trace(scene, camera, vector3df(x, y + 0.5, focus)), weight));
c = add_colors(c, mul_color(trace(scene, camera, vector3df(x + 0.5, y + 0.5, focus)), weight));
set_pixel(i, j, c, canvas);
}
}
}
release_canvas(edges);
}
#ifdef RAY_INTERSECTIONS_STAT
intersections_per_ray /= (w * h);
printf("Average intersections number per pixel: %li\n", intersections_per_ray);
#endif // RAY_INTERSECTIONS_STAT
}