Canvas *
detect_edges_canvas(Canvas * base,
int num_threads) {
Canvas * grayscaled_canv = grayscale_canvas(base, num_threads);
const int w = base->w;
const int h = base->h;
Canvas * grad_canv = new_canvas(w, h);
omp_set_num_threads((num_threads < 2) ? 1 : num_threads);
int x;
int y;
#pragma omp parallel private(x, y)
#pragma omp for collapse(2) schedule(dynamic, IMG_CHUNK)
for(x = 1; x < w - 1; ++x) {
for(y = 1; y < h - 1; ++y) {
int i;
int j;
int gx = 0;
for(i = -1; i < 2; ++i) {
for(j = -1; j < 2; ++j) {
gx += mattrix_x[i + 1][j + 1] * get_pixel(x + i, y + j, grayscaled_canv).r;
}
}
int gy = 0;
for(i = -1; i < 2; ++i) {
for(j = -1; j < 2; ++j) {
gy += mattrix_y[i + 1][j + 1] * get_pixel(x + i, y + j, grayscaled_canv).r;
}
}
Byte grad = (Byte) sqrt(gx * gx + gy * gy);
set_pixel(x, y, rgb(grad, grad, grad), grad_canv);
}
}
release_canvas(grayscaled_canv);
return grad_canv;
}
int
main(void) {
Camera * camera = create_camera();
Canvas * canvas = new_canvas(CANVAS_W,
CANVAS_H);
int i;
for(i = 0; i < MAX_SERPINSKY_PYRAMID_LEVEL; i++) {
Scene * scene = new_scene(MAX_OBJECTS_NUMBER,
MAX_LIGHT_SOURCES_NUMBER,
BACKGROUND_COLOR);
create_serpinsky_pyramid(scene, i);
// Randomness causes unreproducible results
// But in general - results are similar to Serpinsky pyramid
//generate_random_spheres(scene, i * 400);
prepare_scene(scene);
printf("Number of polygons: %i. ", scene->last_object_index + 1);
render_scene(scene,
camera,
canvas,
THREADS_NUM);
release_scene(scene);
}
release_canvas(canvas);
release_camera(camera);
return 0;
}
int
main(void) {
// Allocating scene
Scene * scene = new_scene(MAX_OBJECTS_NUMBER,
MAX_LIGHT_SOURCES_NUMBER,
BACKGROUND_COLOR);
// Allocating new sphere
Float radius = 100;
Point3d center = point3d(0, 0, 0);
Color sphere_color = rgb(250, 30, 30);
Material sphere_material = material(1, 5, 5, 10, 0, 10);
Object3d * sphere = new_sphere(center,
radius,
sphere_color,
sphere_material);
// Adding sphere to the scene
add_object(scene,
sphere);
// Allocating new triangle
Object3d * triangle = new_triangle(point3d(-700, -700, -130), // vertex 1
point3d( 700, -700, -130), // vertex 2
point3d( 0, 400, -130), // vertex 3
rgb(100, 255, 30), // color
material(1, 6, 0, 2, 0, 0) // surface params
);
// Adding triangle to the scene
add_object(scene,
triangle);
// Loading 3D model of cow from *.obj file
// defining transformations and parameters of 3D model
// TODO: must be refactored...
SceneFaceHandlerParams load_params =
new_scene_face_handler_params(scene,
// scale:
40,
// move dx, dy, dz:
-150, -100, 30,
// rotate around axises x, y, z:
0, 0, 0,
// color
rgb(200, 200, 50),
// surface params
material(2, 3, 0, 0, 0, 0)
);
load_obj("./demo/models/cow.obj",
// default handler which adding polygons of 3D model to scene:
scene_face_handler,
&load_params);
// This function is requried (bulding k-d tree of entire scene)
prepare_scene(scene);
printf("\nNumber of polygons: %i\n", scene->last_object_index + 1);
// Allocating new light source
Color light_source_color = rgb(255, 255, 255);
Point3d light_source_location = point3d(-300, 300, 300);
LightSource3d * light_source = new_light_source(light_source_location,
light_source_color);
// Adding light source to the scene
add_light_source(scene,
light_source);
// Adding fog
Float density = 0.002;
set_exponential_fog(scene, density);
// Allocating camera
// TODO: It's a pity, but quaternions are not implemented yet :(
Point3d camera_location = point3d(0, 500, 0);
Float focus = 320;
Float x_angle = -1.57;
Float y_angle = 0;
Float z_angle = 3.14;
Camera * camera = new_camera(camera_location,
x_angle,
y_angle,
z_angle,
focus);
// Rotate camera if needed
// rotate_camera(camera, d_x_angle, d_y_angle, d_z_angle);
// Move camera if needed
// move_camera(camera, vector3df(d_x, d_y, d_z));
// Alocate new canvas, to render scene on it
Canvas * canvas = new_canvas(CANVAS_W,
CANVAS_H);
render_scene(scene,
camera,
canvas,
THREADS_NUM);
// Saving rendered image in PNG format
write_png("example.png",
canvas);
release_canvas(canvas);
release_scene(scene);
release_camera(camera);
return 0;
}
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
}
