VuoSceneObjectGet.c

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#include "VuoSceneObjectGet.h"
 
#include "VuoUrlFetch.h"
#include "VuoImageGet.h"
#include "VuoMeshUtility.h"
 
#include <OpenGL/CGLMacro.h>
 
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdocumentation"
    #include <cimport.h>
    #include <config.h>
    #include <scene.h>
    #include <postprocess.h>
 
    // cfileio.h won't compile without these.
    #ifndef DOXYGEN
        typedef enum aiOrigin aiOrigin;
        typedef struct aiFile aiFile;
        typedef struct aiFileIO aiFileIO;
    #endif
    #include <cfileio.h>
#pragma clang diagnostic pop
 
#include "module.h"
 
#ifdef VUO_COMPILER
VuoModuleMetadata({
                      "title" : "VuoSceneGet",
                      "dependencies" : [
                            "VuoSceneObject",
                            "VuoGlContext",
                            "VuoImageGet",
                            "VuoShader",
                            "VuoUrlFetch",
                            "VuoList_VuoShader",
                            "VuoMeshUtility",
                            "oai",
                            "z"
                      ]
                  });
#endif
 
 
 
typedef struct
{
    size_t dataLength;
    void *data;
    size_t position;
} VuoSceneObjectGet_data;
 
static size_t VuoSceneObjectGet_read(aiFile *af, char *buffer, size_t size, size_t count)
{
//  VLog("  %ld (%ld * %ld)", size*count, size, count);
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)af->UserData;
    if (d->position >= d->dataLength)
    {
//      VLog("  refusing to read past end");
        return 0;
    }
 
    size_t bytesToRead = MIN(d->dataLength - d->position, size*count);
    memcpy(buffer, d->data + d->position, bytesToRead);
//  VLog("  actually read %ld", bytesToRead);
    d->position += bytesToRead;
    return bytesToRead;
}
 
static size_t VuoSceneObjectGet_tell(aiFile *af)
{
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)af->UserData;
//  VLog("  position = %ld", d->position);
    return d->position;
}
 
static size_t VuoSceneObjectGet_size(aiFile *af)
{
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)af->UserData;
    return d->dataLength;
}
 
static aiReturn VuoSceneObjectGet_seek(aiFile *af, size_t p, aiOrigin origin)
{
//  VLog("  seek by %ld (mode %d)", p, origin);
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)af->UserData;
 
    size_t proposedPosition;
    if (origin == aiOrigin_SET)
        proposedPosition = p;
    else if (origin == aiOrigin_CUR)
        proposedPosition = d->position + p;
    else if (origin == aiOrigin_END)
        proposedPosition = d->dataLength - p;
    else
        return aiReturn_FAILURE;
 
    if (proposedPosition >= d->dataLength)
        return aiReturn_FAILURE;
 
    d->position = proposedPosition;
    return aiReturn_SUCCESS;
}
 
static aiFile *VuoSceneObjectGet_open(aiFileIO *afio, const char *filename, const char *mode)
{
//  VLog("%s", filename);
 
    if (strcmp(mode, "rb") != 0)
    {
        VUserLog("Error: Unknown file mode '%s'",mode);
        return NULL;
    }
 
    void *data;
    unsigned int dataLength;
    VuoText filenameT = VuoText_make(filename);
    VuoLocal(filenameT);
    if (!VuoUrl_fetch(filenameT, &data, &dataLength))
        return NULL;
 
    if (dataLength == 0)
    {
        free(data);
        VUserLog("Warning: '%s' is empty", filename);
        return NULL;
    }
 
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)malloc(sizeof(VuoSceneObjectGet_data));
    d->data = data;
    d->dataLength = dataLength;
    d->position = 0;
 
    aiFile *af = (aiFile *)malloc(sizeof(aiFile));
    af->UserData = (aiUserData)d;
 
    af->ReadProc     = VuoSceneObjectGet_read;
    af->TellProc     = VuoSceneObjectGet_tell;
    af->FileSizeProc = VuoSceneObjectGet_size;
    af->SeekProc     = VuoSceneObjectGet_seek;
    af->WriteProc    = NULL;
    af->FlushProc    = NULL;
 
    return af;
}
 
static void VuoSceneObjectGet_close(aiFileIO *afio, aiFile *af)
{
    VuoSceneObjectGet_data *d = (VuoSceneObjectGet_data *)af->UserData;
    free(d->data);
    free(af);
}
 
 
 
static void convertAINodesToVuoSceneObjectsRecursively(const struct aiScene *scene, const struct aiNode *node, VuoShader *shaders, bool *shadersUsed, VuoSceneObject *sceneObject)
{
    VuoSceneObject_setName(*sceneObject, VuoText_make(node->mName.data));
 
    // Copy the node's transform into our VuoSceneObject.
    {
        struct aiMatrix4x4 m = node->mTransformation;
        struct aiVector3D scaling;
        struct aiQuaternion rotation;
        struct aiVector3D position;
        aiDecomposeMatrix(&m, &scaling, &rotation, &position);
        VuoSceneObject_setTransform(*sceneObject, VuoTransform_makeQuaternion(
            (VuoPoint3d){position.x, position.y, position.z},
            (VuoPoint4d){rotation.x, rotation.y, rotation.z, rotation.w},
            (VuoPoint3d){scaling.x, scaling.y, scaling.z}));
    }
 
    // Convert each aiMesh to either a single leaf VuoSceneObject,
    // or a VuoSceneObject group with multiple child VuoSceneObjects.
    if (node->mNumMeshes && node->mNumMeshes == 1 && node->mNumChildren == 0)
        VuoSceneObject_setType(*sceneObject, VuoSceneObjectSubType_Mesh);
    else
    {
        VuoSceneObject_setType(*sceneObject, VuoSceneObjectSubType_Group);
        VuoSceneObject_setChildObjects(*sceneObject, VuoListCreate_VuoSceneObject());
    }
    for (unsigned int meshIndex = 0; meshIndex < node->mNumMeshes; ++meshIndex)
    {
        const struct aiMesh *meshObj = scene->mMeshes[node->mMeshes[meshIndex]];
 
        if (!meshObj->mVertices)
        {
            VUserLog("Error: Mesh '%s' doesn't contain any positions.  Skipping.", meshObj->mName.data);
            continue;
        }
 
        if (!meshObj->mNormals || !meshObj->mTextureCoords[0])
            VUserLog("Warning: Mesh '%s' is missing%s%s.  These channels will be automatically generated, but lighting and 3D object filters may not work correctly.",
                meshObj->mName.data,
                meshObj->mNormals ? "" : " [normals]",
                meshObj->mTextureCoords[0] ? "" : " [texture coordinates]");
 
        float *positions, *normals = NULL, *textureCoordinates = NULL, *colors = NULL;
        unsigned int *elements;
        VuoMesh_allocateCPUBuffers(meshObj->mNumVertices,
            &positions,
            meshObj->mNormals ? &normals : NULL,
            meshObj->mTextureCoords[0] ? &textureCoordinates : NULL,
            meshObj->mColors[0] ? &colors : NULL,
            meshObj->mNumFaces * 3, &elements);
 
        for (unsigned int vertex = 0; vertex < meshObj->mNumVertices; ++vertex)
        {
            struct aiVector3D position = meshObj->mVertices[vertex];
            positions[vertex * 3    ] = position.x;
            positions[vertex * 3 + 1] = position.y;
            positions[vertex * 3 + 2] = position.z;
 
            if (meshObj->mNormals)
            {
                struct aiVector3D normal = meshObj->mNormals[vertex];
                normals[vertex * 3    ] = normal.x;
                normals[vertex * 3 + 1] = normal.y;
                normals[vertex * 3 + 2] = normal.z;
            }
 
            if (meshObj->mTextureCoords[0])
            {
                struct aiVector3D textureCoordinate = meshObj->mTextureCoords[0][vertex];
                textureCoordinates[vertex * 2    ] = textureCoordinate.x;
                textureCoordinates[vertex * 2 + 1] = textureCoordinate.y;
            }
 
            if (meshObj->mColors[0])
            {
                struct aiColor4D color = meshObj->mColors[0][vertex];
                colors[vertex * 4    ] = color.r;
                colors[vertex * 4 + 1] = color.g;
                colors[vertex * 4 + 2] = color.b;
                colors[vertex * 4 + 3] = color.a;
            }
        }
 
        unsigned int numValidElements = 0;
        for (unsigned int face = 0; face < meshObj->mNumFaces; ++face)
        {
            const struct aiFace *faceObj = &meshObj->mFaces[face];
            if (faceObj->mNumIndices != 3)
            {
                VUserLog("Warning: Face %u isn't a triangle (it has %u indices); skipping.",face,faceObj->mNumIndices);
                continue;
            }
 
            elements[numValidElements++] = faceObj->mIndices[0];
            elements[numValidElements++] = faceObj->mIndices[1];
            elements[numValidElements++] = faceObj->mIndices[2];
        }
 
        VuoMesh mesh = VuoMesh_makeFromCPUBuffers(meshObj->mNumVertices, positions, normals, textureCoordinates, colors, numValidElements, elements, VuoMesh_IndividualTriangles);
 
        // if no texture coordinates found, attempt to generate passable ones.
        if (!meshObj->mTextureCoords[0])
            VuoMeshUtility_calculateSphericalUVs(mesh);
 
        if (node->mNumMeshes == 1 && node->mNumChildren == 0)
        {
            VuoSceneObject_setMesh(*sceneObject, mesh);
            VuoSceneObject_setShader(*sceneObject, shaders[meshObj->mMaterialIndex]);
            shadersUsed[meshObj->mMaterialIndex] = true;
        }
        else
        {
            // Add this aiMesh as a child of this VuoSceneObject.
            VuoSceneObject child = VuoSceneObject_makeMesh(mesh, shaders[meshObj->mMaterialIndex], VuoTransform_makeIdentity());
            VuoListAppendValue_VuoSceneObject(VuoSceneObject_getChildObjects(*sceneObject), child);
            shadersUsed[meshObj->mMaterialIndex] = true;
        }
    }
 
    for (unsigned int child = 0; child < node->mNumChildren; ++child)
    {
        VuoSceneObject childSceneObject = VuoSceneObject_makeEmpty();
        convertAINodesToVuoSceneObjectsRecursively(scene, node->mChildren[child], shaders, shadersUsed, &childSceneObject);
        VuoListAppendValue_VuoSceneObject(VuoSceneObject_getChildObjects(*sceneObject), childSceneObject);
    }
}
 
bool VuoSceneObject_get(VuoText sceneURL, VuoSceneObject *scene, bool center, bool fit, bool hasLeftHandedCoordinates)
{
    *scene = NULL;
 
    if (VuoText_isEmpty(sceneURL))
        return false;
 
    struct aiPropertyStore *props = aiCreatePropertyStore();
    VuoGlContext_perform(^(CGLContextObj cgl_ctx){
        GLint maxIndices;
        glGetIntegerv(GL_MAX_ELEMENTS_INDICES, &maxIndices);
        aiSetImportPropertyInteger(props, AI_CONFIG_PP_SLM_TRIANGLE_LIMIT, maxIndices/3);
 
        GLint maxVertices;
        glGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &maxVertices);
        aiSetImportPropertyInteger(props, AI_CONFIG_PP_SLM_VERTEX_LIMIT, maxVertices);
 
        static bool limitsLogged = false;
        if (!limitsLogged)
        {
            limitsLogged = true;
            VDebugLog("OpenGL driver reports maxIndices=%d, maxVertices=%d", maxIndices, maxVertices);
        }
    });
 
    struct aiFileIO fileHandlers;
    fileHandlers.OpenProc = VuoSceneObjectGet_open;
    fileHandlers.CloseProc = VuoSceneObjectGet_close;
 
    const struct aiScene *ais = aiImportFileExWithProperties(
                sceneURL,
                aiProcess_Triangulate
//              | aiProcess_PreTransformVertices
//              | aiProcess_CalcTangentSpace
                | aiProcess_GenSmoothNormals
                | aiProcess_SplitLargeMeshes
                | aiProcess_GenUVCoords,
//              | aiProcess_OptimizeMeshes
//              | aiProcess_OptimizeGraph
                &fileHandlers,
                props);
    aiReleasePropertyStore(props);
    if (!ais)
    {
        VUserLog("Error: %s", aiGetErrorString());
        return false;
    }
 
    if (ais->mFlags & AI_SCENE_FLAGS_INCOMPLETE)
        VUserLog("Warning: Open Asset Import wasn't able to parse everything in this file.");
 
    VuoText normalizedSceneURL = VuoUrl_normalize(sceneURL, VuoUrlNormalize_default);
    VuoRetain(normalizedSceneURL);
    size_t lastSlashInSceneURL = VuoText_findLastOccurrence(normalizedSceneURL, "/");
    VuoText sceneURLWithoutFilename = VuoText_substring(normalizedSceneURL, 1, lastSlashInSceneURL);
    VuoRetain(sceneURLWithoutFilename);
    VuoRelease(normalizedSceneURL);
 
    VuoShader shaders[ais->mNumMaterials];
    bool shadersUsed[ais->mNumMaterials];
    for (int i=0; i<ais->mNumMaterials; ++i)
    {
        struct aiMaterial *m = ais->mMaterials[i];
 
        struct aiString name;
        aiGetMaterialString(m, AI_MATKEY_NAME, &name);
        // VLog("material %d: %s",i,name.data);
 
        // Some meshes (such as the leaves in "Tree 2 N020414.3DS") obviously expect two-sided rendering,
        // so I tried using material property AI_MATKEY_TWOSIDED.  But I wasn't able to find (or create with Blender)
        // any meshes having materials where AI_MATKEY_TWOSIDED is nonzero.
//      int twosided = 0;
//      aiGetMaterialIntegerArray(m, AI_MATKEY_TWOSIDED, &twosided, NULL);
 
        VuoShader shader = NULL;
 
        struct aiColor4D diffuseColorAI = {1,1,1,1};
        aiGetMaterialColor(m, AI_MATKEY_COLOR_DIFFUSE, &diffuseColorAI);
        VuoColor diffuseColor = VuoColor_makeWithRGBA(diffuseColorAI.r, diffuseColorAI.g, diffuseColorAI.b, diffuseColorAI.a);
//      VLog("\tdiffuseColor: %s",VuoColor_getSummary(diffuseColor));
 
        struct aiColor4D specularColorAI = {1,1,1,1};
        aiGetMaterialColor(m, AI_MATKEY_COLOR_SPECULAR, &specularColorAI);
        VuoColor specularColor = VuoColor_makeWithRGBA(specularColorAI.r, specularColorAI.g, specularColorAI.b, specularColorAI.a);
    //      VLog("\tspecularColor: %s",VuoColor_getSummary(specularColor));
 
        float shininess = 10;
        aiGetMaterialFloatArray(m, AI_MATKEY_SHININESS, &shininess, NULL);
        if (shininess)
            shininess = MAX(1.0001 - 1./shininess, 0);
    //      VLog("\tshininess: %g",shininess);
 
        int diffuseTextures = aiGetMaterialTextureCount(m, aiTextureType_DIFFUSE);
        VuoImage diffuseImage = NULL;
        if (diffuseTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_DIFFUSE, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
 
            VuoText urlParts[2] = {sceneURLWithoutFilename, path.data};
            VuoText textureURL = VuoText_append(urlParts, 2);
            VuoRetain(textureURL);
//          VLog("\tdiffuse: %s",textureURL);
 
            diffuseImage = VuoImage_get(textureURL);
 
            VuoRelease(textureURL);
        }
 
        int normalTextures = aiGetMaterialTextureCount(m, aiTextureType_NORMALS);
        VuoImage normalImage = NULL;
        if (normalTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_NORMALS, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
 
            VuoText urlParts[2] = {sceneURLWithoutFilename, path.data};
            VuoText textureURL = VuoText_append(urlParts, 2);
            VuoRetain(textureURL);
//          VLog("\tnormal: %s",textureURL);
 
            normalImage = VuoImage_get(textureURL);
 
            VuoRelease(textureURL);
        }
 
        int specularTextures = aiGetMaterialTextureCount(m, aiTextureType_SPECULAR);
        VuoImage specularImage = NULL;
        if (specularTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_SPECULAR, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
 
            VuoText urlParts[2] = {sceneURLWithoutFilename, path.data};
            VuoText textureURL = VuoText_append(urlParts, 2);
            VuoRetain(textureURL);
//          VLog("\tspecular: %s",textureURL);
 
            specularImage = VuoImage_get(textureURL);
 
            VuoRelease(textureURL);
        }
 
// Other texture types to consider supporting eventually...
#if 0
        int ambientTextures = aiGetMaterialTextureCount(m, aiTextureType_AMBIENT);
        if (ambientTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_AMBIENT, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\tambient: %s",path.data);
        }
 
        int emissiveTextures = aiGetMaterialTextureCount(m, aiTextureType_EMISSIVE);
        if (emissiveTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_EMISSIVE, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\temissive: %s",path.data);
        }
 
        int opacityTextures = aiGetMaterialTextureCount(m, aiTextureType_OPACITY);
        if (opacityTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_OPACITY, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\topacity: %s",path.data);
        }
 
        int lightmapTextures = aiGetMaterialTextureCount(m, aiTextureType_LIGHTMAP);
        if (lightmapTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_LIGHTMAP, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\tlightmap: %s",path.data);
        }
 
        int reflectionTextures = aiGetMaterialTextureCount(m, aiTextureType_REFLECTION);
        if (reflectionTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_REFLECTION, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\treflection: %s",path.data);
        }
 
        int displacementTextures = aiGetMaterialTextureCount(m, aiTextureType_DISPLACEMENT);
        if (displacementTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_DISPLACEMENT, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\tdisplacement: %s",path.data);
        }
 
        int heightTextures = aiGetMaterialTextureCount(m, aiTextureType_HEIGHT);
        if (heightTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_HEIGHT, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\theight: %s",path.data);
        }
 
        int unknownTextures = aiGetMaterialTextureCount(m, aiTextureType_UNKNOWN);
        if (unknownTextures)
        {
            struct aiString path;
            aiGetMaterialTexture(m, aiTextureType_UNKNOWN, 0, &path, NULL, NULL, NULL, NULL, NULL, NULL);
            VUserLog("\tunknown: %s",path.data);
        }
#endif
 
        if (normalImage || specularImage)
        {
            if (!diffuseImage)
                diffuseImage = VuoImage_makeColorImage(diffuseColor, 1, 1);
 
            if (!normalImage)
                normalImage = VuoImage_makeColorImage(VuoColor_makeWithRGBA(0.5,0.5,1,1), 1, 1);
 
            if (!specularImage)
                specularImage = VuoImage_makeColorImage(VuoColor_makeWithRGBA(1,1,1,.9), 1, 1);
 
            VuoImage_setWrapMode(diffuseImage, VuoImageWrapMode_Repeat);
            VuoImage_setWrapMode(normalImage, VuoImageWrapMode_Repeat);
            VuoImage_setWrapMode(specularImage, VuoImageWrapMode_Repeat);
            shader = VuoShader_makeLitImageDetailsShader(diffuseImage, 1, specularImage, normalImage);
        }
        else if (diffuseImage)
        {
            VuoImage_setWrapMode(diffuseImage, VuoImageWrapMode_Repeat);
            shader = VuoShader_makeLitImageShader(diffuseImage, 1, specularColor, shininess);
        }
        else
            shader = VuoShader_makeLitColorShader(diffuseColor, specularColor, shininess);
 
        VuoRelease(shader->name);
        shader->name = VuoText_make(name.data);
        VuoRetain(shader->name);
 
        // VLog("\tshader: %s",shader->summary);//VuoShader_getSummary(shader));
 
        shaders[i] = shader;
        shadersUsed[i] = false;
    }
    VuoRelease(sceneURLWithoutFilename);
 
    *scene = VuoSceneObject_makeEmpty();
    convertAINodesToVuoSceneObjectsRecursively(ais, ais->mRootNode, shaders, shadersUsed, scene);
 
    for (unsigned int i = 0; i < ais->mNumMaterials; ++i)
        if (!shadersUsed[i])
        {
            VuoRetain(shaders[i]);
            VuoRelease(shaders[i]);
        }
 
    if(center)
        VuoSceneObject_center(*scene);
 
    if(fit)
        VuoSceneObject_normalize(*scene);
 
    if(hasLeftHandedCoordinates)
    {
        VuoSceneObject_apply(*scene, ^(VuoSceneObject currentObject, float modelviewMatrix[16])
        {
            // VuoTransform flipAxis = VuoTransform_makeEuler( (VuoPoint3d) {0,0,0}, (VuoPoint3d){0,0,0}, (VuoPoint3d){-1, 1, 1} );
            // float matrix[16];
            // VuoTransform_getMatrix(flipAxis, matrix);
 
            VuoMesh mesh = VuoSceneObject_getMesh(currentObject);
            if (mesh)
            {
                unsigned int vertexCount, elementCount, *elements;
                float *positions;
                VuoMesh_getCPUBuffers(mesh, &vertexCount, &positions, NULL, NULL, NULL, &elementCount, &elements);
 
                for (int n = 0; n < vertexCount; n++)
                    positions[n * 3] *= -1;
 
                // flip triangle winding order
                switch (VuoMesh_getElementAssemblyMethod(mesh))
                {
                    case VuoMesh_IndividualTriangles:
                        for(int i = 0; i < elementCount; i+= 3)
                        {
                            unsigned int tmp = elements[i];
                            elements[i] = elements[i+2];
                            elements[i+2] = tmp;
                        }
                        break;
 
                        // @todo - fill in additional winding order flip methods whenever this loader
                        // provides the ability to read 'em
                        // http://www.asawicki.info/news_1524_how_to_flip_triangles_in_triangle_mesh.html
                        // case VuoMesh_TriangleStrip:
                        // {
                        //  unsigned int elementCount = msh.elementCount;
 
                        //  // add an extra duplicate vertex at the beginning of the strip
                        //  // if the element count is even
                        //  if(elementCount % 2 == 0)
                        //  {
                        //      msh.elementCount++;
                        //      unsigned int *resized = malloc(sizeof(unsigned int) * msh.elementCount);
                        //      resized[0] = msh.elements[0];
                        //      memcpy(&resized[1], msh.elements, sizeof(unsigned int) * msh.elementCount);
                        //      msh.elements = resized;
                        //  }
                        //  else
                        //  {
                        //      for(int i = 0; i < elementCount / 2; i++)
                        //      {
                        //          unsigned int tmp = msh.elements[i];
                        //          msh.elements[i] = msh.elements[elementCount-i];
                        //          msh.elements[i] = tmp;
                        //      }
                        //  }
                        // } break;
 
                        default:
                            break;
                }
            }
        });
    }
 
    aiReleaseImport(ais);
 
    return true;
}