src/engine/asset.c

   1 #include "asset.h"
   2
   3 #include <math.h>
   4 #include <stdlib.h>
   5 #include <assimp/cimport.h>
   6 //#include <assimp/metadata.h>
   7 #include <assimp/postprocess.h>
   8 #include <assimp/scene.h>
   9
  10 #include "logger.h"
  11 #include "string.h"
  12 #include "tga.h"
  13
  14 #define IMPORT_DEBUG_ 1
  15
  16 static const float smoothingThresholdAngle = TAU / 14.0f;
  17
  18 static const struct aiScene* importScene(const char* path);
  19 static Vector3D triangleNormal(Vector3D v1, Vector3D v2, Vector3D v3);
  20 static Vector3D convertAiVector3D(struct aiVector3D vect);
  21 static const char* replaceFileExtension(const struct aiString path, const char* ext);
  22
  23
  24
  25 #if IMPORT_DEBUG_
  26 static void printMetadata(const struct aiMetadata* meta) {
  27         if (meta) {
  28                 for (size_t i = 0; i < meta->mNumProperties; ++i) {
  29                         String key = stringFromAiString(meta->mKeys[i]);
  30                         const struct aiMetadataEntry value = meta->mValues[i];
  31                         switch (value.mType) {
  32                                 case AI_BOOL:
  33                                         logDebug("\"%s\": (bool) %d", key.cstr, *((int*) value.mData));
  34                                         break;
  35                                 case AI_INT32:
  36                                         logDebug("\"%s\": (int32) %d", key.cstr, *((int32_t*) value.mData));
  37                                         break;
  38                                 case AI_UINT64:
  39                                         logDebug("\"%s\": (uint64) %llu", key.cstr, *((uint64_t*) value.mData));
  40                                         break;
  41                                 case AI_FLOAT:
  42                                         logDebug("\"%s\": (float) %f", key.cstr, *((float*) value.mData));
  43                                         break;
  44                                 case AI_DOUBLE:
  45                                         logDebug("\"%s\": (double) %f", key.cstr, *((double*) value.mData));
  46                                         break;
  47                                 case AI_AISTRING: {
  48                                         String str = stringFromAiString(*((struct aiString*) value.mData));
  49                                         logDebug("\"%s\": (string) %s", key.cstr, str.cstr);
  50                                         dropString(str);
  51                                         break; }
  52                                 case AI_AIVECTOR3D: {
  53                                         struct aiVector3D vec = *((struct aiVector3D*) value.mData);
  54                                         logDebug("\"%s\": (vector3d) { %f, %f, %f }", key.cstr, vec.x, vec.y, vec.z);
  55                                         break; }
  56                                 case AI_META_MAX:
  57                                 default:
  58                                         logDebug("\"%s\": (unrecognized type)", key.cstr);
  59                                         break;
  60                         }
  61                         dropString(key);
  62                 }
  63         }
  64 }
  65
  66 void printAiNodeMetadata(const struct aiNode* node) {
  67         if (!node) {
  68                 return;
  69         }
  70
  71         String name = stringFromAiString(node->mName);
  72         logDebug("Metadata from node \"%s\": %p", name.cstr, node->mMetaData);
  73         printMetadata(node->mMetaData);
  74
  75         for (size_t i = 0; i < node->mNumChildren; ++i) {
  76                 printAiNodeMetadata(node->mChildren[i]);
  77         }
  78
  79         dropString(name);
  80 }
  81 #endif // IMPORT_DEBUG_
  82
  83 const Solid* importSolid(const char* path) {
  84         const struct aiScene* scene = importScene(path);
  85         if (scene == NULL) {
  86                 logError("Failed to import solid from %s", path);
  87                 return NULL;
  88         }
  89
  90 #if IMPORT_DEBUG_
  91         const struct aiMetadata* meta = scene->mMetaData;
  92         logDebug("Metadata from %s: %p", path, meta);
  93         printMetadata(meta);
  94         printAiNodeMetadata(scene->mRootNode);
  95 #endif // IMPORT_DEBUG_
  96
  97         const unsigned int numMeshes = scene->mNumMeshes;
  98         const unsigned int numMaterials = scene->mNumMaterials;
  99
 100         // TODO Consider assets with some arrays empty, and prevent zero mallocs
 101
 102         Solid* solid = malloc(sizeof(Solid));
 103         solid->numMeshes = numMeshes;
 104         solid->meshes = malloc(numMeshes * sizeof(Mesh));
 105         solid->numMaterials = numMaterials;
 106         solid->materials = malloc(numMaterials * sizeof(Material));
 107
 108         for (unsigned int meshIndex = 0; meshIndex < numMeshes; ++meshIndex) {
 109                 const struct aiMesh* aiMesh = scene->mMeshes[meshIndex];
 110                 const unsigned int numVertices = aiMesh->mNumVertices;
 111                 const unsigned int numFaces = aiMesh->mNumFaces;
 112
 113                 Mesh mesh = { .numVertices = numVertices,
 114                               .vertices = malloc(numVertices * sizeof(Vector3D)),
 115                               .normals = NULL,
 116                               .textureCoords = NULL,
 117                               .numFaces = numFaces,
 118                               .faces = malloc(numFaces * sizeof(Face)),
 119                               .materialIndex = aiMesh->mMaterialIndex };
 120
 121                 for (unsigned int vertIndex = 0; vertIndex < numVertices; ++vertIndex) {
 122                         mesh.vertices[vertIndex] = convertAiVector3D(
 123                                         aiMesh->mVertices[vertIndex]);
 124                 }
 125
 126                 if (aiMesh->mNormals != NULL) {
 127                         mesh.normals = malloc(numVertices * sizeof(Vector3D));
 128                         for (unsigned int normIndex = 0; normIndex < numVertices; ++normIndex) {
 129                                 mesh.normals[normIndex] = convertAiVector3D(
 130                                                 aiMesh->mNormals[normIndex]);
 131                         }
 132                 }
 133
 134                 mesh.textureCoords = malloc(numVertices * sizeof(Vector3D));
 135                 for (unsigned int texcIndex = 0; texcIndex < numVertices; ++texcIndex) {
 136                         mesh.textureCoords[texcIndex] = convertAiVector3D(
 137                                         aiMesh->mTextureCoords[0][texcIndex]);
 138                 }
 139
 140                 for (unsigned int faceIndex = 0; faceIndex < numFaces; ++faceIndex) {
 141                         const struct aiFace aiFace = aiMesh->mFaces[faceIndex];
 142                         const unsigned int numIndices = aiFace.mNumIndices;
 143
 144                         Face face = { .numIndices = numIndices,
 145                                       .indices = malloc(numIndices * sizeof(size_t)),
 146                                       .normals = malloc(numIndices * sizeof(Vector3D)) };
 147
 148                         for (unsigned int i = 0; i < numIndices; ++i) {
 149                                 face.indices[i] = aiFace.mIndices[i];
 150                         }
 151
 152                         if (numIndices == 3) {
 153                                 Vector3D normal = triangleNormal(mesh.vertices[face.indices[0]],
 154                                                                  mesh.vertices[face.indices[1]],
 155                                                                  mesh.vertices[face.indices[2]]);
 156                                 for (size_t i = 0; i < numIndices; ++i) {
 157                                         face.normals[i] = normal;
 158                                 }
 159                         }
 160                         else {
 161                                 if (mesh.normals) {
 162                                         for (size_t i = 0; i < numIndices; ++i) {
 163                                                 face.normals[i] = mesh.normals[face.indices[i]];
 164                                         }
 165                                 }
 166                                 else {
 167                                         free(face.normals);
 168                                         face.normals = NULL;
 169                                 }
 170                         }
 171
 172                         mesh.faces[faceIndex] = face;
 173                 }
 174
 175                 float smoothingThreshold = cosf(smoothingThresholdAngle);
 176                 Face* smoothedFaces = malloc(mesh.numFaces * sizeof(Face));
 177                 for (size_t faceIndex = 0; faceIndex < mesh.numFaces; ++faceIndex) {
 178                         Face face = mesh.faces[faceIndex];
 179
 180                         if (face.normals) {
 181                                 face.normals = memcpy(malloc(face.numIndices * sizeof(Vector3D)),
 182                                                       face.normals,
 183                                                       face.numIndices * sizeof(Vector3D));
 184
 185                                 for (size_t indexIndex = 0; indexIndex < face.numIndices; ++indexIndex) {
 186                                         Vector3D smoothedNormal = face.normals[indexIndex];
 187
 188                                         for (size_t i = 0; i < mesh.numFaces; ++i) {
 189                                                 if (i == faceIndex || !mesh.faces[i].normals) {
 190                                                         continue;
 191                                                 }
 192
 193                                                 for (size_t k = 0; k < mesh.faces[i].numIndices; ++k) {
 194                                                         if (mesh.faces[i].indices[k] == face.indices[indexIndex]
 195                                                             && dotProduct(face.normals[indexIndex],
 196                                                                           mesh.faces[i].normals[k]) >= smoothingThreshold) {
 197                                                                 smoothedNormal = addVectors(smoothedNormal, mesh.faces[i].normals[k]);
 198                                                         }
 199                                                 }
 200                                         }
 201
 202                                         face.normals[indexIndex] = normalized(smoothedNormal);
 203                                 }
 204                         }
 205                         smoothedFaces[faceIndex] = face;
 206                 }
 207                 // TODO Actually clean up the stuff inside
 208                 free(mesh.faces);
 209                 mesh.faces = smoothedFaces;
 210
 211                 solid->meshes[meshIndex] = mesh;
 212         }
 213
 214         GLuint* textureIds = malloc(numMaterials * sizeof(GLuint));
 215         glGenTextures(numMaterials, textureIds);
 216
 217         for (unsigned int matIndex = 0; matIndex < numMaterials; ++matIndex) {
 218                 Material material = { .textureId = textureIds[matIndex] };
 219
 220 #if IMPORT_DEBUG_
 221                 const struct aiMaterialProperty* prop;
 222                 aiGetMaterialProperty(scene->mMaterials[matIndex],
 223                                       AI_MATKEY_SHADING_MODEL,
 224                                       &prop);
 225
 226                 String key = stringFromAiString(prop->mKey);
 227
 228                 logDebug("Material property \"%s\": Shading model: (length %u) %d",
 229                          key.cstr,
 230                          prop->mDataLength,
 231                          *((int32_t*) prop->mData));
 232
 233                 dropString(key);
 234 #endif // IMPORT_DEBUG_
 235
 236                 glBindTexture(GL_TEXTURE_2D, material.textureId);
 237                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 238
 239                 struct aiString originalTexturePath;
 240                 if (aiGetMaterialTexture(scene->mMaterials[matIndex],
 241                                          aiTextureType_DIFFUSE,
 242                                          0,
 243                                          &originalTexturePath,
 244                                          NULL, NULL, NULL, NULL, NULL, NULL) == AI_SUCCESS) {
 245                         const char* textureFilename = replaceFileExtension(originalTexturePath, ".tga");
 246                         const size_t textureFilenameLength = strlen(textureFilename);
 247                         char* texturePath = malloc(strlen("assets/") + textureFilenameLength + 1);
 248                         strcpy(texturePath, "assets/");
 249                         strncat(texturePath, textureFilename, textureFilenameLength);
 250
 251                         TgaImage* textureImage = readTga(texturePath);
 252                         if (textureImage == NULL) {
 253                                 logError("Importing solid from %s: Cannot read texture file %s", path, texturePath);
 254                         }
 255                         else {
 256                                 glTexImage2D(GL_TEXTURE_2D,
 257                                              0,
 258                                              textureImage->imageComponents,
 259                                              textureImage->header.imageWidth,
 260                                              textureImage->header.imageHeight,
 261                                              0,
 262                                              textureImage->imageFormat,
 263                                              GL_UNSIGNED_BYTE,
 264                                              textureImage->bytes);
 265                                 free(textureImage->bytes);
 266                                 free(textureImage);
 267                         }
 268                 }
 269
 270                 solid->materials[matIndex] = material;
 271         }
 272         glBindTexture(GL_TEXTURE_2D, 0);
 273
 274         aiReleaseImport(scene);
 275         return solid;
 276 }
 277
 278 static const struct aiScene* importScene(const char* path) {
 279         const struct aiScene* scene = aiImportFile(path, aiProcess_JoinIdenticalVertices
 280                                                          | aiProcess_PreTransformVertices
 281                                                          | aiProcess_ValidateDataStructure);
 282         if (scene != NULL && scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE) {
 283                 logError("Incomplete scene imported from %s", path);
 284                 aiReleaseImport(scene);
 285                 scene = NULL;
 286         }
 287         return scene;
 288 }
 289
 290 static Vector3D triangleNormal(Vector3D v1, Vector3D v2, Vector3D v3) {
 291         return normalized(crossProduct(subtractVectors(v2, v1), subtractVectors(v3, v1)));
 292 }
 293
 294 static Vector3D convertAiVector3D(struct aiVector3D vect) {
 295         return (Vector3D) { .x = vect.x,
 296                             .y = vect.y,
 297                             .z = vect.z };
 298 }
 299
 300 /**
 301  * BUGS
 302  * The following function will not work properly with texture
 303  * file names (excluding directory part) beginning with '.'
 304  */
 305 static const char* replaceFileExtension(const struct aiString path, const char* ext) {
 306                 size_t lengthToCopy = path.length;
 307
 308                 char* lastDotSubstr = strrchr(path.data, '.');
 309                 if (lastDotSubstr != NULL) {
 310                         if (strpbrk(lastDotSubstr, "\\/") == NULL) {
 311                                 lengthToCopy = lastDotSubstr - path.data;
 312                         }
 313                 }
 314
 315                 size_t extLength = strlen(ext) + 1;
 316                 char* newPath = malloc(lengthToCopy + extLength);
 317                 strncpy(newPath, path.data, lengthToCopy);
 318                 strncpy(newPath + lengthToCopy, ext, extLength);
 319
 320                 return newPath;
 321 }