Pure C Assimp model file loading example

assimp_opengl_load.c

VAO* load_model(const char* path) {
	// import model
	const struct aiScene* scene = aiImportFile(path, aiProcess_Triangulate); // http://assimp.sourceforge.net/lib_html/structai_scene.html
	
	if(scene->mNumMeshes <= 0) {
		aiReleaseImport(scene);
		return 0;
	}
	
	struct aiMesh* mesh = *scene->mMeshes; // http://assimp.sourceforge.net/lib_html/structai_mesh.html
	
	// allocate memory
	float* farr = malloc(2 * mesh[0].mNumVertices * sizeof(float));
	if(farr == 0) {
		// TODO: Handle OOM
		aiReleaseImport(scene);
		return 0;
	}
	unsigned int* iarr = malloc(3 * mesh[0].mNumFaces * sizeof(unsigned int));
	if(iarr == 0) {
		// TODO: Handle OOM
		free(farr);
		aiReleaseImport(scene);
		return 0;
	}
	
	// copy tex coords from stupid 3d texcoord array
	unsigned int farr_count = 0;
	for(int i=0; i<mesh[0].mNumVertices; i++) {
		farr[farr_count++] = mesh[0].mTextureCoords[0][i].x;
		farr[farr_count++] = mesh[0].mTextureCoords[0][i].y;
	}
	
	// copy indices from stupid array format
	unsigned int iarr_count = 0;
	for(int i=0; i<mesh[0].mNumFaces; i++) {
		iarr[iarr_count++] = mesh[0].mFaces[i].mIndices[0];
		iarr[iarr_count++] = mesh[0].mFaces[i].mIndices[1];
		iarr[iarr_count++] = mesh[0].mFaces[i].mIndices[2];
	}
	
	// upload data to a vao, this is my code, but you should already know this part
	globj_newModel(3);
	globj_pushVbo(3 * mesh[0].mNumVertices * sizeof(float), 3, (float*) mesh[0].mVertices);
	globj_pushVbo(2 * mesh[0].mNumVertices * sizeof(float), 2, farr);
	globj_pushVbo(3 * mesh[0].mNumVertices * sizeof(float), 3, (float*) mesh[0].mNormals);
	
	globj_pushIbo(iarr_count * sizeof(unsigned int), iarr);
	
	// free arrays
	free(iarr);
	free(farr);
	
	// free scene
	aiReleaseImport(scene);
	
	// finalizes model
	return globj_finalize(mesh[0].mNumVertices);
}