d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
388 lines
11 KiB
C++
388 lines
11 KiB
C++
/**************************************************************************/
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/* geometry_2d.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "geometry_2d.h"
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#include "thirdparty/misc/clipper.hpp"
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#include "thirdparty/misc/polypartition.h"
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#define STB_RECT_PACK_IMPLEMENTATION
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#include "thirdparty/misc/stb_rect_pack.h"
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#define SCALE_FACTOR 100000.0 // Based on CMP_EPSILON.
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Vector<Vector<Vector2>> Geometry2D::decompose_polygon_in_convex(Vector<Point2> polygon) {
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Vector<Vector<Vector2>> decomp;
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List<TPPLPoly> in_poly, out_poly;
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TPPLPoly inp;
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inp.Init(polygon.size());
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for (int i = 0; i < polygon.size(); i++) {
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inp.GetPoint(i) = polygon[i];
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}
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inp.SetOrientation(TPPL_ORIENTATION_CCW);
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in_poly.push_back(inp);
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TPPLPartition tpart;
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if (tpart.ConvexPartition_HM(&in_poly, &out_poly) == 0) { // Failed.
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ERR_PRINT("Convex decomposing failed!");
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return decomp;
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}
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decomp.resize(out_poly.size());
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int idx = 0;
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for (List<TPPLPoly>::Element *I = out_poly.front(); I; I = I->next()) {
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TPPLPoly &tp = I->get();
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decomp.write[idx].resize(tp.GetNumPoints());
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for (int64_t i = 0; i < tp.GetNumPoints(); i++) {
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decomp.write[idx].write[i] = tp.GetPoint(i);
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}
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idx++;
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}
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return decomp;
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}
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struct _AtlasWorkRect {
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Size2i s;
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Point2i p;
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int idx = 0;
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_FORCE_INLINE_ bool operator<(const _AtlasWorkRect &p_r) const { return s.width > p_r.s.width; };
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};
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struct _AtlasWorkRectResult {
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Vector<_AtlasWorkRect> result;
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int max_w = 0;
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int max_h = 0;
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};
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void Geometry2D::make_atlas(const Vector<Size2i> &p_rects, Vector<Point2i> &r_result, Size2i &r_size) {
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// Super simple, almost brute force scanline stacking fitter.
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// It's pretty basic for now, but it tries to make sure that the aspect ratio of the
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// resulting atlas is somehow square. This is necessary because video cards have limits
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// on texture size (usually 2048 or 4096), so the squarer a texture, the more the chances
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// that it will work in every hardware.
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// For example, it will prioritize a 1024x1024 atlas (works everywhere) instead of a
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// 256x8192 atlas (won't work anywhere).
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ERR_FAIL_COND(p_rects.size() == 0);
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for (int i = 0; i < p_rects.size(); i++) {
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ERR_FAIL_COND(p_rects[i].width <= 0);
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ERR_FAIL_COND(p_rects[i].height <= 0);
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}
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Vector<_AtlasWorkRect> wrects;
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wrects.resize(p_rects.size());
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for (int i = 0; i < p_rects.size(); i++) {
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wrects.write[i].s = p_rects[i];
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wrects.write[i].idx = i;
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}
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wrects.sort();
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int widest = wrects[0].s.width;
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Vector<_AtlasWorkRectResult> results;
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for (int i = 0; i <= 12; i++) {
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int w = 1 << i;
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int max_h = 0;
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int max_w = 0;
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if (w < widest) {
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continue;
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}
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Vector<int> hmax;
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hmax.resize(w);
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for (int j = 0; j < w; j++) {
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hmax.write[j] = 0;
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}
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// Place them.
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int ofs = 0;
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int limit_h = 0;
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for (int j = 0; j < wrects.size(); j++) {
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if (ofs + wrects[j].s.width > w) {
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ofs = 0;
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}
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int from_y = 0;
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for (int k = 0; k < wrects[j].s.width; k++) {
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if (hmax[ofs + k] > from_y) {
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from_y = hmax[ofs + k];
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}
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}
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wrects.write[j].p.x = ofs;
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wrects.write[j].p.y = from_y;
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int end_h = from_y + wrects[j].s.height;
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int end_w = ofs + wrects[j].s.width;
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if (ofs == 0) {
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limit_h = end_h;
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}
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for (int k = 0; k < wrects[j].s.width; k++) {
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hmax.write[ofs + k] = end_h;
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}
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if (end_h > max_h) {
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max_h = end_h;
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}
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if (end_w > max_w) {
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max_w = end_w;
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}
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if (ofs == 0 || end_h > limit_h) { // While h limit not reached, keep stacking.
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ofs += wrects[j].s.width;
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}
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}
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_AtlasWorkRectResult result;
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result.result = wrects;
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result.max_h = max_h;
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result.max_w = max_w;
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results.push_back(result);
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}
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// Find the result with the best aspect ratio.
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int best = -1;
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real_t best_aspect = 1e20;
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for (int i = 0; i < results.size(); i++) {
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real_t h = next_power_of_2(results[i].max_h);
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real_t w = next_power_of_2(results[i].max_w);
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real_t aspect = h > w ? h / w : w / h;
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if (aspect < best_aspect) {
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best = i;
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best_aspect = aspect;
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}
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}
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r_result.resize(p_rects.size());
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for (int i = 0; i < p_rects.size(); i++) {
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r_result.write[results[best].result[i].idx] = results[best].result[i].p;
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}
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r_size = Size2(results[best].max_w, results[best].max_h);
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}
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Vector<Vector<Point2>> Geometry2D::_polypaths_do_operation(PolyBooleanOperation p_op, const Vector<Point2> &p_polypath_a, const Vector<Point2> &p_polypath_b, bool is_a_open) {
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using namespace ClipperLib;
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ClipType op = ctUnion;
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switch (p_op) {
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case OPERATION_UNION:
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op = ctUnion;
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break;
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case OPERATION_DIFFERENCE:
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op = ctDifference;
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break;
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case OPERATION_INTERSECTION:
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op = ctIntersection;
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break;
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case OPERATION_XOR:
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op = ctXor;
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break;
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}
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Path path_a, path_b;
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// Need to scale points (Clipper's requirement for robust computation).
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for (int i = 0; i != p_polypath_a.size(); ++i) {
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path_a << IntPoint(p_polypath_a[i].x * (real_t)SCALE_FACTOR, p_polypath_a[i].y * (real_t)SCALE_FACTOR);
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}
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for (int i = 0; i != p_polypath_b.size(); ++i) {
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path_b << IntPoint(p_polypath_b[i].x * (real_t)SCALE_FACTOR, p_polypath_b[i].y * (real_t)SCALE_FACTOR);
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}
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Clipper clp;
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clp.AddPath(path_a, ptSubject, !is_a_open); // Forward compatible with Clipper 10.0.0.
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clp.AddPath(path_b, ptClip, true); // Polylines cannot be set as clip.
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Paths paths;
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if (is_a_open) {
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PolyTree tree; // Needed to populate polylines.
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clp.Execute(op, tree);
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OpenPathsFromPolyTree(tree, paths);
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} else {
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clp.Execute(op, paths); // Works on closed polygons only.
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}
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// Have to scale points down now.
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Vector<Vector<Point2>> polypaths;
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for (Paths::size_type i = 0; i < paths.size(); ++i) {
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Vector<Vector2> polypath;
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const Path &scaled_path = paths[i];
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for (Paths::size_type j = 0; j < scaled_path.size(); ++j) {
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polypath.push_back(Point2(
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static_cast<real_t>(scaled_path[j].X) / (real_t)SCALE_FACTOR,
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static_cast<real_t>(scaled_path[j].Y) / (real_t)SCALE_FACTOR));
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}
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polypaths.push_back(polypath);
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}
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return polypaths;
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}
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Vector<Vector<Point2>> Geometry2D::_polypath_offset(const Vector<Point2> &p_polypath, real_t p_delta, PolyJoinType p_join_type, PolyEndType p_end_type) {
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using namespace ClipperLib;
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JoinType jt = jtSquare;
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switch (p_join_type) {
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case JOIN_SQUARE:
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jt = jtSquare;
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break;
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case JOIN_ROUND:
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jt = jtRound;
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break;
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case JOIN_MITER:
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jt = jtMiter;
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break;
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}
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EndType et = etClosedPolygon;
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switch (p_end_type) {
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case END_POLYGON:
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et = etClosedPolygon;
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break;
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case END_JOINED:
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et = etClosedLine;
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break;
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case END_BUTT:
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et = etOpenButt;
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break;
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case END_SQUARE:
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et = etOpenSquare;
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break;
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case END_ROUND:
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et = etOpenRound;
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break;
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}
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ClipperOffset co(2.0, 0.25f * (real_t)SCALE_FACTOR); // Defaults from ClipperOffset.
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Path path;
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// Need to scale points (Clipper's requirement for robust computation).
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for (int i = 0; i != p_polypath.size(); ++i) {
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path << IntPoint(p_polypath[i].x * (real_t)SCALE_FACTOR, p_polypath[i].y * (real_t)SCALE_FACTOR);
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}
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co.AddPath(path, jt, et);
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Paths paths;
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co.Execute(paths, p_delta * (real_t)SCALE_FACTOR); // Inflate/deflate.
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// Have to scale points down now.
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Vector<Vector<Point2>> polypaths;
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for (Paths::size_type i = 0; i < paths.size(); ++i) {
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Vector<Vector2> polypath;
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const Path &scaled_path = paths[i];
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for (Paths::size_type j = 0; j < scaled_path.size(); ++j) {
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polypath.push_back(Point2(
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static_cast<real_t>(scaled_path[j].X) / (real_t)SCALE_FACTOR,
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static_cast<real_t>(scaled_path[j].Y) / (real_t)SCALE_FACTOR));
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}
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polypaths.push_back(polypath);
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}
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return polypaths;
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}
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Vector<Point2i> Geometry2D::pack_rects(const Vector<Size2i> &p_sizes, const Size2i &p_atlas_size) {
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Vector<stbrp_node> nodes;
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nodes.resize(p_atlas_size.width);
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stbrp_context context;
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stbrp_init_target(&context, p_atlas_size.width, p_atlas_size.height, nodes.ptrw(), p_atlas_size.width);
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Vector<stbrp_rect> rects;
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rects.resize(p_sizes.size());
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for (int i = 0; i < p_sizes.size(); i++) {
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rects.write[i].id = 0;
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rects.write[i].w = p_sizes[i].width;
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rects.write[i].h = p_sizes[i].height;
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rects.write[i].x = 0;
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rects.write[i].y = 0;
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rects.write[i].was_packed = 0;
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}
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int res = stbrp_pack_rects(&context, rects.ptrw(), rects.size());
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if (res == 0) { //pack failed
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return Vector<Point2i>();
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}
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Vector<Point2i> ret;
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ret.resize(p_sizes.size());
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for (int i = 0; i < p_sizes.size(); i++) {
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Point2i r(rects[i].x, rects[i].y);
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ret.write[i] = r;
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}
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return ret;
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}
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Vector<Vector3i> Geometry2D::partial_pack_rects(const Vector<Vector2i> &p_sizes, const Size2i &p_atlas_size) {
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Vector<stbrp_node> nodes;
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nodes.resize(p_atlas_size.width);
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memset(nodes.ptrw(), 0, sizeof(stbrp_node) * nodes.size());
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stbrp_context context;
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stbrp_init_target(&context, p_atlas_size.width, p_atlas_size.height, nodes.ptrw(), p_atlas_size.width);
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Vector<stbrp_rect> rects;
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rects.resize(p_sizes.size());
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for (int i = 0; i < p_sizes.size(); i++) {
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rects.write[i].id = i;
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rects.write[i].w = p_sizes[i].width;
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rects.write[i].h = p_sizes[i].height;
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rects.write[i].x = 0;
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rects.write[i].y = 0;
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rects.write[i].was_packed = 0;
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}
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stbrp_pack_rects(&context, rects.ptrw(), rects.size());
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Vector<Vector3i> ret;
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ret.resize(p_sizes.size());
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for (int i = 0; i < p_sizes.size(); i++) {
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ret.write[rects[i].id] = Vector3i(rects[i].x, rects[i].y, rects[i].was_packed != 0 ? 1 : 0);
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}
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return ret;
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}
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