src/polygoncache.cpp

Tue, 07 Jun 2022 01:37:26 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Tue, 07 Jun 2022 01:37:26 +0300
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child 205
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1 #include "polygoncache.h"
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2 #include "documentmanager.h"
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3 #include "invert.h"
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4
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5 Model* resolve(const QString& name, const ModelId callingModelId, DocumentManager* documents)
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6 {
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7 return documents->findDependencyByName(callingModelId, name);
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8 }
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9
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10 /**
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11 * @brief Gets the GL polygons of the object at the specified position in the model
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12 * @param index Index of object in the model
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13 * @param polygons_out Vector to add polygons into
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14 * @param context Context to use to resolve subfile references
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15 */
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16 static std::vector<gl::Polygon> getPolygonsAt(const Model* model, GetPolygonsContext* context)
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17 {
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18 std::vector<gl::Polygon> result;
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19 for (int i = 0; i < model->size(); i += 1)
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20 {
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21 const ModelElement& element = (*model)[i];
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22 const ModelId id = model->idAt(i);
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23 std::visit<void>(overloaded{
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24 [&](const Colored<LineSegment>& edge) {
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25 result.push_back(gl::edgeLine(edge, id));
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26 },
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27 [&](const Colored<Triangle>& triangle) {
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28 result.push_back(gl::triangle(triangle, id));
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29 },
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30 [&](const Colored<Quadrilateral>& quad) {
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31 result.push_back(gl::quadrilateral(quad, id));
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32 },
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33 [&](const Colored<ConditionalEdge>& cedge) {
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34 result.push_back(gl::conditionalEdge(cedge, id));
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35 },
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36 [&](const Colored<SubfileReference>& ref) {
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37 Model* dependency = context->documents->findDependencyByName(context->modelId, ref.name);
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38 PolygonCache* cache = nullptr;
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39 if (dependency != nullptr)
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40 {
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41 const auto dependencyModelId = context->documents->findIdForModel(dependency);
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42 if (dependencyModelId.has_value()) {
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43 cache = context->documents->getPolygonCacheForModel(dependencyModelId.value());
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44 }
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45 }
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46 if (cache != nullptr) {
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47 const bool needInverting = glm::determinant(ref.transformation) < 0;
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48 const std::vector<gl::Polygon>& modelPolygons = getCachedPolygons(
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49 cache,
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50 dependency,
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51 context->documents);
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52 result.reserve(result.size() + modelPolygons.size());
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53 for (gl::Polygon polygon : modelPolygons)
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54 {
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55 for (unsigned int i = 0; i < polygon.numPolygonVertices(); i += 1)
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56 {
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57 const glm::vec4 homogenousVertex {polygon.vertices[i], 1};
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58 polygon.vertices[i] = ref.transformation * homogenousVertex;
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59 }
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60 if (needInverting != ref.inverted)
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61 {
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62 gl::invert(polygon);
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63 }
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64 if (polygon.color == ldraw::MAIN_COLOR)
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65 {
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66 polygon.color = ref.color;
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67 }
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68 polygon.id = id;
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69 result.push_back(polygon);
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70 }
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71 }
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72 },
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73 [](const ModelElement&) {}
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74 }, element);
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75 }
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76 return result;
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77 }
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79 /**
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80 * @brief Gets a list of GL polygons that are used to represent this model.
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81 * @details Will build polygons if polygons are outdated.
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82 * @param documents Documents to use to resolve subfile references
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83 * @return vector of GL polygons
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84 */
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85 const std::vector<gl::Polygon> &getCachedPolygons(
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86 PolygonCache *cache,
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87 Model *model,
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88 DocumentManager *documents)
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89 {
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90 if (cache->needRecache)
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91 {
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92 cache->cachedPolygons.clear();
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93 const std::optional<ModelId> modelId = documents->findIdForModel(model);
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94 if (modelId.has_value())
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95 {
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96 GetPolygonsContext context{modelId.value(), documents};
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97 cache->cachedPolygons = getPolygonsAt(model, &context);
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98 }
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99 cache->needRecache = false;
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100 }
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101 return cache->cachedPolygons;
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102 }

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