2 #include <assimp/cimport.h>
3 #include <assimp/postprocess.h>
9 static const AiScene* importScene(const char* path);
10 static Vector3D convertAiVector3D(AiVector3D vect);
11 static const char* replaceFileExtension(const AiString path, const char* ext);
15 const Asset3D* importAsset(const char* path) {
16 const AiScene* scene = importScene(path);
21 const unsigned int numMeshes = scene->mNumMeshes;
22 const unsigned int numMaterials = scene->mNumMaterials;
24 Asset3D* asset = malloc(sizeof(Asset3D));
25 asset->numMeshes = numMeshes;
26 asset->meshes = malloc(numMeshes * sizeof(Mesh));
27 asset->numMaterials = numMaterials;
28 asset->materials = malloc(numMaterials * sizeof(Material));
30 for (unsigned int meshIndex = 0; meshIndex < numMeshes; ++meshIndex) {
31 const AiMesh* aiMesh = scene->mMeshes[meshIndex];
32 const unsigned int numVertices = aiMesh->mNumVertices;
33 const unsigned int numFaces = aiMesh->mNumFaces;
35 Mesh mesh = { .numVertices = numVertices,
36 .vertices = malloc(numVertices * sizeof(Vector3D)),
38 .textureCoords = NULL,
40 .faces = malloc(numFaces * sizeof(Face)),
41 .materialIndex = aiMesh->mMaterialIndex };
43 for (unsigned int vertIndex = 0; vertIndex < numVertices; ++vertIndex) {
44 mesh.vertices[vertIndex] = convertAiVector3D(
45 aiMesh->mVertices[vertIndex]);
48 if (aiMesh->mNormals != NULL) {
49 mesh.normals = malloc(numVertices * sizeof(Vector3D));
50 for (unsigned int normIndex = 0; normIndex < numVertices; ++normIndex) {
51 mesh.normals[normIndex] = convertAiVector3D(
52 aiMesh->mNormals[normIndex]);
56 if (aiMesh->mTextureCoords != NULL) {
57 mesh.textureCoords = malloc(numVertices * sizeof(Vector3D));
58 for (unsigned int texcIndex = 0; texcIndex < numVertices; ++texcIndex) {
59 mesh.textureCoords[texcIndex] = convertAiVector3D(
60 aiMesh->mTextureCoords[0][texcIndex]);
64 for (unsigned int faceIndex = 0; faceIndex < numFaces; ++faceIndex) {
65 const AiFace aiFace = aiMesh->mFaces[faceIndex];
66 const unsigned int numIndices = aiFace.mNumIndices;
68 Face face = { .numIndices = numIndices,
69 .indices = malloc(numIndices
70 * sizeof(unsigned int)) };
72 for (unsigned int i = 0; i < numIndices; ++i) {
73 face.indices[i] = aiFace.mIndices[i];
76 mesh.faces[faceIndex] = face;
79 asset->meshes[meshIndex] = mesh;
82 GLuint* textureIds = malloc(numMaterials * sizeof(GLuint));
83 glGenTextures(numMaterials, textureIds);
85 for (unsigned int matIndex = 0; matIndex < numMaterials; ++matIndex) {
86 Material material = { .textureId = textureIds[matIndex] };
88 glBindTexture(GL_TEXTURE_2D, material.textureId);
89 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
91 AiString originalTexturePath;
92 if (aiGetMaterialTexture(scene->mMaterials[matIndex],
93 aiTextureType_DIFFUSE,
96 NULL, NULL, NULL, NULL, NULL, NULL) == AI_SUCCESS) {
97 const char* textureFile = replaceFileExtension(originalTexturePath, ".tga");
98 const size_t textureFileLength = strlen(textureFile);
99 char* texturePath = malloc(strlen("assets/") + textureFileLength + 1);
100 strcpy(texturePath, "assets/");
101 strncat(texturePath, textureFile, textureFileLength);
103 TgaImage* textureImage = readTga(texturePath);
104 if (textureImage == NULL) {
105 logError("Asset texture file not found: %s", texturePath);
108 glTexImage2D(GL_TEXTURE_2D,
110 textureImage->imageComponents,
111 textureImage->header.imageWidth,
112 textureImage->header.imageHeight,
114 textureImage->imageFormat,
116 textureImage->bytes);
117 free(textureImage->bytes);
122 asset->materials[matIndex] = material;
124 glBindTexture(GL_TEXTURE_2D, 0);
126 aiReleaseImport(scene);
130 static const AiScene* importScene(const char* path) {
131 const AiScene* scene = aiImportFile(path, aiProcess_PreTransformVertices);
133 logError("Failed to import asset from %s", path);
135 else if ((scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE) == AI_SCENE_FLAGS_INCOMPLETE) {
136 logError("Incomplete scene imported from %s", path);
137 aiReleaseImport(scene);
143 static Vector3D convertAiVector3D(AiVector3D vect) {
144 return (Vector3D) { .x = vect.x,
150 * The following function will not work properly with texture
151 * file names (excluding directory part) beginning with '.'
153 static const char* replaceFileExtension(const AiString path, const char* ext) {
154 size_t lengthToCopy = path.length;
156 char* lastDotSubstr = strrchr(path.data, '.');
157 if (lastDotSubstr != NULL) {
158 if (strpbrk(lastDotSubstr, "\\/") == NULL) {
159 lengthToCopy = lastDotSubstr - path.data;
163 size_t extLength = strlen(ext) + 1;
164 char* newPath = malloc(lengthToCopy + extLength);
165 strncpy(newPath, path.data, lengthToCopy);
166 strncpy(newPath + lengthToCopy, ext, extLength);