src/model/shape.cpp

   1 #include "Shape.hpp"
   2 #include "ShapeRegistry.hpp"
   3
   4 #include "bounds.hpp"
   5 #include "../io/TokenStreamReader.hpp"
   6
   7 #include <string>
   8
   9 using namespace std;
  10
  11
  12 namespace blank {
  13
  14 Shape::Shape()
  15 : bounds()
  16 , vertices()
  17 , indices()
  18 , fill({ false, false, false, false, false, false }) {
  19
  20 }
  21
  22 void Shape::Read(TokenStreamReader &in) {
  23         bounds.reset();
  24         vertices.clear();
  25         indices.clear();
  26         fill = { false, false, false, false, false, false };
  27
  28         string name;
  29         in.Skip(Token::ANGLE_BRACKET_OPEN);
  30         while (in.HasMore() && in.Peek().type != Token::ANGLE_BRACKET_CLOSE) {
  31                 in.ReadIdentifier(name);
  32                 in.Skip(Token::EQUALS);
  33                 if (name == "bounds") {
  34                         string bounds_class;
  35                         in.ReadIdentifier(bounds_class);
  36                         in.Skip(Token::PARENTHESIS_OPEN);
  37                         if (bounds_class == "Cuboid") {
  38                                 glm::vec3 min;
  39                                 glm::vec3 max;
  40                                 in.ReadVec(min);
  41                                 in.Skip(Token::COMMA);
  42                                 in.ReadVec(max);
  43                                 bounds.reset(new CuboidBounds(AABB{min, max}));
  44                         } else if (bounds_class == "Stair") {
  45                                 glm::vec3 min;
  46                                 glm::vec3 max;
  47                                 glm::vec2 split;
  48                                 in.ReadVec(min);
  49                                 in.Skip(Token::COMMA);
  50                                 in.ReadVec(max);
  51                                 in.Skip(Token::COMMA);
  52                                 in.ReadVec(split);
  53                                 bounds.reset(new StairBounds(AABB{min, max}, split));
  54                         } else {
  55                                 while (in.Peek().type != Token::PARENTHESIS_CLOSE) {
  56                                         in.Next();
  57                                 }
  58                         }
  59                         in.Skip(Token::PARENTHESIS_CLOSE);
  60
  61                 } else if (name == "vertices") {
  62                         in.Skip(Token::ANGLE_BRACKET_OPEN);
  63                         while (in.HasMore() && in.Peek().type != Token::ANGLE_BRACKET_CLOSE) {
  64                                 in.Skip(Token::ANGLE_BRACKET_OPEN);
  65                                 Vertex vtx;
  66                                 in.ReadVec(vtx.position);
  67                                 in.Skip(Token::COMMA);
  68                                 in.ReadVec(vtx.normal);
  69                                 in.Skip(Token::COMMA);
  70                                 in.ReadVec(vtx.tex_st);
  71                                 in.Skip(Token::COMMA);
  72                                 in.ReadNumber(vtx.tex_id);
  73                                 if (in.Peek().type == Token::COMMA) {
  74                                         in.Skip(Token::COMMA);
  75                                 }
  76                                 in.Skip(Token::ANGLE_BRACKET_CLOSE);
  77                                 if (in.Peek().type == Token::COMMA) {
  78                                         in.Skip(Token::COMMA);
  79                                 }
  80                                 vertices.push_back(vtx);
  81                         }
  82                         in.Skip(Token::ANGLE_BRACKET_CLOSE);
  83
  84                 } else if (name == "indices") {
  85                         in.Skip(Token::ANGLE_BRACKET_OPEN);
  86                         while (in.HasMore() && in.Peek().type != Token::ANGLE_BRACKET_CLOSE) {
  87                                 indices.push_back(in.GetULong());
  88                                 if (in.Peek().type == Token::COMMA) {
  89                                         in.Skip(Token::COMMA);
  90                                 }
  91                         }
  92                         in.Skip(Token::ANGLE_BRACKET_CLOSE);
  93
  94                 } else if (name == "fill") {
  95                         in.Skip(Token::BRACKET_OPEN);
  96                         fill.face[Block::FACE_UP] = in.GetBool();
  97                         in.Skip(Token::COMMA);
  98                         fill.face[Block::FACE_DOWN] = in.GetBool();
  99                         in.Skip(Token::COMMA);
 100                         fill.face[Block::FACE_RIGHT] = in.GetBool();
 101                         in.Skip(Token::COMMA);
 102                         fill.face[Block::FACE_LEFT] = in.GetBool();
 103                         in.Skip(Token::COMMA);
 104                         fill.face[Block::FACE_FRONT] = in.GetBool();
 105                         in.Skip(Token::COMMA);
 106                         fill.face[Block::FACE_BACK] = in.GetBool();
 107                         in.Skip(Token::BRACKET_CLOSE);
 108
 109                 } else {
 110                         // try to skip, might fail though
 111                         while (in.HasMore() && in.Peek().type != Token::SEMICOLON) {
 112                                 in.Next();
 113                         }
 114                 }
 115                 in.Skip(Token::SEMICOLON);
 116         }
 117         in.Skip(Token::ANGLE_BRACKET_CLOSE);
 118 }
 119
 120 float Shape::TexR(const vector<float> &tex_map, size_t off) noexcept {
 121         if (off < tex_map.size()) {
 122                 return tex_map[off];
 123         } else if (!tex_map.empty()) {
 124                 return tex_map.back();
 125         } else {
 126                 return 0.0f;
 127         }
 128 }
 129
 130 void Shape::Fill(
 131         EntityMesh::Buffer &buf,
 132         const vector<float> &tex_map
 133 ) const {
 134         for (const auto &vtx : vertices) {
 135                 buf.vertices.emplace_back(vtx.position);
 136                 buf.normals.emplace_back(vtx.normal);
 137                 buf.tex_coords.emplace_back(vtx.tex_st.s, vtx.tex_st.t, TexR(tex_map, vtx.tex_id));
 138         }
 139         for (auto idx : indices) {
 140                 buf.indices.emplace_back(idx);
 141         }
 142 }
 143
 144 void Shape::Fill(
 145         EntityMesh::Buffer &buf,
 146         const glm::mat4 &transform,
 147         const vector<float> &tex_map
 148 ) const {
 149         for (const auto &vtx : vertices) {
 150                 buf.vertices.emplace_back(transform * glm::vec4(vtx.position, 1.0f));
 151                 buf.normals.emplace_back(transform * glm::vec4(vtx.normal, 0.0f));
 152                 buf.tex_coords.emplace_back(vtx.tex_st.s, vtx.tex_st.t, TexR(tex_map, vtx.tex_id));
 153         }
 154         for (auto idx : indices) {
 155                 buf.indices.emplace_back(idx);
 156         }
 157 }
 158
 159 void Shape::Fill(
 160         BlockMesh::Buffer &buf,
 161         const glm::mat4 &transform,
 162         const vector<float> &tex_map,
 163         size_t idx_offset
 164 ) const {
 165         for (const auto &vtx : vertices) {
 166                 buf.vertices.emplace_back(transform * glm::vec4(vtx.position, 1.0f));
 167                 buf.tex_coords.emplace_back(vtx.tex_st.s, vtx.tex_st.t, TexR(tex_map, vtx.tex_id));
 168         }
 169         for (auto idx : indices) {
 170                 buf.indices.emplace_back(idx_offset + idx);
 171         }
 172 }
 173
 174 size_t Shape::OutlineCount() const noexcept {
 175         if (bounds) {
 176                 return bounds->OutlineCount();
 177         } else {
 178                 return 0;
 179         }
 180 }
 181
 182 size_t Shape::OutlineIndexCount() const noexcept {
 183         if (bounds) {
 184                 return bounds->OutlineIndexCount();
 185         } else {
 186                 return 0;
 187         }
 188 }
 189
 190 void Shape::Outline(OutlineMesh::Buffer &out) const {
 191         if (bounds) {
 192                 bounds->Outline(out);
 193         }
 194 }
 195
 196 bool Shape::Intersects(
 197         const Ray &ray,
 198         const glm::mat4 &M,
 199         float &dist,
 200         glm::vec3 &normal
 201 ) const noexcept {
 202         if (bounds) {
 203                 return bounds->Intersects(ray, M, dist, normal);
 204         } else {
 205                 return false;
 206         }
 207 }
 208
 209 bool Shape::Intersects(
 210         const glm::mat4 &M,
 211         const AABB &box,
 212         const glm::mat4 &box_M,
 213         float &depth,
 214         glm::vec3 &normal
 215 ) const noexcept {
 216         if (bounds) {
 217                 return bounds->Intersects(M, box, box_M, depth, normal);
 218         } else {
 219                 return false;
 220         }
 221 }
 222
 223
 224 ShapeRegistry::ShapeRegistry()
 225 : shapes() {
 226
 227 }
 228
 229 Shape &ShapeRegistry::Add(const string &name) {
 230         auto result = shapes.emplace(name, Shape());
 231         if (result.second) {
 232                 return result.first->second;
 233         } else {
 234                 throw runtime_error("duplicate shape " + name);
 235         }
 236 }
 237
 238 Shape &ShapeRegistry::Get(const string &name) {
 239         auto entry = shapes.find(name);
 240         if (entry != shapes.end()) {
 241                 return entry->second;
 242         } else {
 243                 throw runtime_error("unknown shape " + name);
 244         }
 245 }
 246
 247 const Shape &ShapeRegistry::Get(const string &name) const {
 248         auto entry = shapes.find(name);
 249         if (entry != shapes.end()) {
 250                 return entry->second;
 251         } else {
 252                 throw runtime_error("unknown shape " + name);
 253         }
 254 }
 255
 256 }