Updated world module (now voronoi roads work
This commit is contained in:
Segey Lapin
331
modules/world/road_grid.cpp
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331
modules/world/road_grid.cpp
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#include <cassert>
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#include <cmath>
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#include <core/math/geometry.h>
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#include <core/resource.h>
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#include <scene/2d/canvas_item.h>
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#include <modules/voronoi/voronoi.h>
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#include <modules/opensimplex/open_simplex_noise.h>
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#include "road_grid.h"
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RoadGrid::RoadGrid()
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{
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grid_width = 16;
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grid_height = 16;
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class_sizes[SITE_EMPTY] = 10000;
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class_sizes[SITE_TOWN] = 100000;
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class_sizes[SITE_FARM] = 500000;
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class_sizes[SITE_FOREST] = 1000000;
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class_sizes[SITE_UNASSIGNED] = 2000000;
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}
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RoadGrid::~RoadGrid()
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{
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}
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/* TODO: constants, configuration */
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Dictionary RoadGrid::build_diagram(int npatches, int center_count, int center_step, int spread, int dim)
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{
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printf("build_diagram %d %d %d %d %d\n", npatches, center_count, center_step, spread, dim);
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Vector<Vector2i> centers;
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/* zero is always used */
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centers.push_back(Vector2i(0, 0));
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float sa = rnd->randf() * 2.0 * Math_PI;
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int i, bad = 0, cx, cp;
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while (centers.size() < center_count) {
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int center_x = CLAMP(center_step * (int)((rnd->randi() % spread) - spread / 2), -dim, dim);
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int center_y = CLAMP(center_step * (int)((rnd->randi() % spread) - spread / 2), -dim, dim);
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Vector2i c(center_x, center_y);
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if (centers.find(c) < 0) {
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centers.push_back(c);
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bad = 0;
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} else
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bad++;
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if (bad > 1000)
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break;
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}
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assert(centers.size() > 1);
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Vector<Vector2> points;
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for (cx = 0; cx < centers.size(); cx++) {
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float maxr = 0.0f;
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for (cp = 0; cp < npatches * 8; cp++) {
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float a = sa + sqrtf((float)cp) * 8.0f;
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float r = (cp == 0) ? 0.0f : 100.0f + (float)cp * 100.0f + 50.0f * rnd->randf();
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float x = floor(cosf(a) * r + (float)centers[cx].x);
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float y = floor(sinf(a) * r + (float)centers[cx].y);
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if (maxr < r)
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maxr = r;
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Vector2 p(x, y);
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if (points.find(p) < 0)
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points.push_back(p);
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}
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struct cluster cst;
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cst.c = centers[cx];
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cst.r = maxr + 50.0f;
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clusters.push_back(cst);
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}
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PoolVector<Vector2> cpoints;
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cpoints.resize(points.size());
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memcpy(cpoints.write().ptr(), points.ptr(), points.size() * sizeof(Vector2));
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Dictionary diagram = Voronoi::get_singleton()->generate_diagram(cpoints, 11);
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return diagram;
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}
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bool RoadGrid::segment_intersects_rect(const Vector2 &a, const Vector2 &b, const Rect2 &rect)
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{
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real_t min = 0, max = 1;
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const Vector2 &p_from = a;
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const Vector2 &p_to = b;
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for (int i = 0; i < 2; i++) {
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real_t seg_from = p_from[i];
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real_t seg_to = p_to[i];
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real_t box_begin = rect.position[i];
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real_t box_end = box_begin + rect.size[i];
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real_t cmin, cmax;
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if (seg_from < seg_to) {
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if (seg_from > box_end || seg_to < box_begin) {
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return false;
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}
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real_t length = seg_to - seg_from;
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cmin = (seg_from < box_begin) ? ((box_begin - seg_from) / length) : 0;
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cmax = (seg_to > box_end) ? ((box_end - seg_from) / length) : 1;
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} else {
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if (seg_to > box_end || seg_from < box_begin) {
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return false;
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}
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real_t length = seg_to - seg_from;
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cmin = (seg_from > box_end) ? (box_end - seg_from) / length : 0;
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cmax = (seg_to < box_begin) ? (box_begin - seg_from) / length : 1;
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}
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if (cmin > min) {
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min = cmin;
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}
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if (cmax < max) {
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max = cmax;
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}
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if (max < min) {
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return false;
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}
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}
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return true;
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}
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void RoadGrid::draw_debug(Node *drawable, int size_x, int size_y) const
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{
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int i, j;
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CanvasItem *ci = Object::cast_to<CanvasItem>(drawable);
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if (!ci)
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return;
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if (bounds.size.x <= 0.0f || bounds.size.y <= 0.0f) {
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printf("zero bounds %f %f\n", bounds.size.x, bounds.size.y);
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return;
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}
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for (i = 0; i < map_sites.size(); i++) {
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Vector2 a = (map_sites[i].pos - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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ci->draw_circle(a, 4.0f, Color(0.0f, 0.5f, 0.5f, 1.0f));
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}
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for (i = 0; i < map_hedges.size(); i++) {
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Vector2 xa = diagram_vertices[map_hedges[i]->a];
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Vector2 xb = diagram_vertices[map_hedges[i]->b];
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Vector2 a = (xa - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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Vector2 b = (xb - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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ci->draw_line(a, b, Color(0.0f, 0.7f, 0.7f, 1.0f), 3.0f, true);
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}
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Rect2i g = rect_to_grid(bounds);
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for (i = g.position.y - 1; i < g.position.y + g.size.y + 1; i++) {
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for (j = g.position.x - 1; j < g.position.x + g.size.x + 1; j++) {
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if (hedge_grid.has(j) && hedge_grid[j].has(i)) {
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List<struct half_edge *> items = hedge_grid[j][i];
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List<struct half_edge *>::Element *e;
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for (e = items.front(); e; e = e->next()) {
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struct half_edge *he = e->get();
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assert(he->a >= 0);
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assert(he->b >= 0);
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assert(he->a != he->b);
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assert(he->site >= 0);
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Vector2 xa = diagram_vertices[he->a];
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Vector2 xb = diagram_vertices[he->b];
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const struct map_site *site = &map_sites[he->site];
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Vector2 pos = (site->pos - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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ci->draw_circle(pos, 3.0f, Color(0.2f, 0.2f, 0.5f, 1.0f));
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Vector2 a = (xa - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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Vector2 b = (xb - bounds.position) * Vector2(size_x, size_y) / bounds.size;
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ci->draw_line(a, b, Color(0.2f, 0.2f, 0.7f, 1.0f), 2.0f, true);
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}
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}
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}
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}
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}
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void RoadGrid::index_site(struct map_site *site)
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{
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int i;
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site->vertices_ind.resize(site->vertices.size());
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site->polygon_ind.resize(site->polygon.size());
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/* slow as fuck */
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for (i = 0; i < site->vertices.size(); i++) {
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int idx = diagram_vertices.find(site->vertices[i]);
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if (idx < 0) {
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idx = diagram_vertices.size();
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diagram_vertices.push_back(site->vertices[i]);
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}
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site->vertices_ind.write[i] = idx;
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}
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for (i = 0; i < site->polygon.size(); i++) {
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int idx = diagram_vertices.find(site->polygon[i]);
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if (idx < 0) {
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idx = diagram_vertices.size();
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diagram_vertices.push_back(site->polygon[i]);
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}
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site->polygon_ind.write[i] = idx;
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}
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site->hedges.resize(site->polygon.size());
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for (i = 0; i < site->polygon.size(); i++) {
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int idx1 = site->polygon_ind[i];
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int idx2 = site->polygon_ind[(i + 1) % site->polygon.size()];
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struct half_edge he;
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he.a = idx1;
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he.b = idx2;
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he.site = site->index;
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/* use length to decide */
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he.depth = 6.0f;
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he.length = diagram_vertices[idx1].distance_to(diagram_vertices[idx2]);
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site->hedges.write[i] = he;
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}
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}
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void RoadGrid::process_diagram(const Dictionary &diagram)
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{
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const Array &sites = diagram["sites"];
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int i, j;
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map_sites.resize(sites.size());
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int hedge_count = 0, hedge_idx;
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printf("start processing sites\n");
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for (i = 0; i < sites.size(); i++) {
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struct map_site site;
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const Dictionary &site_data = sites[i];
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const Array &graphedges = site_data["graphedges"];
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printf("processing site: %d\n", i);
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site.graphedges.resize(graphedges.size());
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for (j = 0; j < graphedges.size(); j++) {
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const Dictionary &ge_data = graphedges[j];
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struct graphedge ge;
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ge.a = ge_data["a"];
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ge.b = ge_data["b"];
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ge.edge = ge_data["edge"];
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site.graphedges.write[j] = ge;
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}
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site.index = site_data["index"];
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site.pos = site_data["pos"];
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site.polygon = site_data["polygon"];
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site.vertices = site_data["vertices"];
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site.site_type = SITE_UNASSIGNED;
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site.cluster = -1;
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index_site(&site);
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hedge_count += site.hedges.size();
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map_sites.write[i] = site;
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}
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printf("processing sites done\n");
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/* Fill global half edges array and put in grid */
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printf("processing %d half edges\n", hedge_count);
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map_hedges.resize(hedge_count);
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hedge_idx = 0;
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for (i = 0; i < map_sites.size(); i++) {
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for (j = 0; j < map_sites[i].hedges.size(); j++) {
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/* bad bad constness */
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struct half_edge *hedge = &map_sites.write[i].hedges.write[j];
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map_hedges.write[hedge_idx] = hedge;
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add_hedge_to_grid(hedge);
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hedge_idx++;
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}
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}
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printf("processing half edges done\n");
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classify_sites();
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printf("processing done, sites count: %d\n", map_sites.size());
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}
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void RoadGrid::build(Ref<Curve> curve, Ref<OpenSimplexNoise> noise)
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{
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rnd.instance();
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rnd->randomize();
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printf("build_diagram\n");
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// Dictionary diagram = build_diagram(8, 2 + (rnd->randi() % 2), 100, 100, 50);
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Dictionary diagram = build_diagram(8, 2, 100, 100, 30);
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printf("build_diagram done\n");
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printf("process_diagram\n");
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process_diagram(diagram);
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printf("process_diagram done\n");
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printf("%d %d\n", curve.is_valid(), noise.is_valid());
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assert(curve.is_valid() && noise.is_valid());
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int i;
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if (curve.is_valid() && noise.is_valid()) {
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printf("building 3rd dimention\n");
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diagram_vertex_heights.resize(diagram_vertices.size());
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for (i = 0; i < diagram_vertices.size(); i++) {
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float n = noise->get_noise_2dv(diagram_vertices[i]);
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float t = (n + 1.0f) * 0.5f;
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float d = MAX(1.0f, curve->interpolate_baked(t));
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diagram_vertex_heights.write[i] = d;
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}
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for (i = 0; i < map_hedges.size(); i++) {
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int x1 = map_hedges[i]->a;
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int x2 = map_hedges[i]->b;
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float xd = diagram_vertices[x1].distance_squared_to(diagram_vertices[x2]);
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float dh = fabsf(diagram_vertex_heights[x2] - diagram_vertex_heights[x1]);
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if (fabsf(dh / xd) > 0.02f)
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diagram_vertex_heights.write[x2] = diagram_vertex_heights[x1] + dh / fabsf(dh) * 0.02f * xd;
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}
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printf("building 3rd dimention done\n");
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}
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}
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Vector2 RoadGrid::get_influence(int x, int y) const
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{
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static int mind = 1000000;
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static int maxd = 0;
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List<struct half_edge *> hlist;
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if (hedge_grid.has(x / grid_width) && hedge_grid[x / grid_width].has(y / grid_height))
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hlist = hedge_grid[x / grid_width][y / grid_height];
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if (hlist.size() == 0)
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return Vector2();
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List<struct half_edge *>::Element *e;
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for (e = hlist.front(); e; e = e->next()) {
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struct half_edge *he = e->get();
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Vector2 a = diagram_vertices[he->a];
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Vector2 b = diagram_vertices[he->b];
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Vector2 p(x, y);
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Vector2 seg[] = {a, b};
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Vector2 pt = Geometry::get_closest_point_to_segment_2d(p, seg);
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float d = pt.distance_squared_to(p);
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if (d < he->depth * he->depth) {
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Vector2 ret;
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ret.x = 1.0f;
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assert(diagram_vertex_heights.size() > he->a);
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assert(diagram_vertex_heights.size() > he->b);
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float h1 = diagram_vertex_heights[he->a];
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float h2 = diagram_vertex_heights[he->b];
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float l = he->length;
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assert(l > 0.0f);
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float m1 = pt.distance_to(a) / l;
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float m2 = CLAMP(1.0f - m1, 0.0f, 1.0f);
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float h = h1 * (1.0f - m1) + h2 * (1.0f - m2);
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ret.y = h;
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return ret;
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}
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}
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return Vector2();
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}
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void RoadGrid::_bind_methods()
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{
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ClassDB::bind_method(D_METHOD("draw_debug", "drawable", "size_x", "size_y"), &RoadGrid::draw_debug);
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ClassDB::bind_method(D_METHOD("get_influence", "x", "y"), &RoadGrid::get_influence);
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ClassDB::bind_method(D_METHOD("build", "curve", "noise"), &RoadGrid::build);
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}
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