assimp/code/AssetLib/USD/USDLoaderImplTinyusdz.cpp

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/** @file  USDLoader.cpp
 *  @brief Implementation of the USD importer class
 */

#ifndef ASSIMP_BUILD_NO_USD_IMPORTER
#include <memory>

// internal headers
#include <assimp/ai_assert.h>
#include <assimp/anim.h>
#include <assimp/DefaultIOSystem.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/fast_atof.h>
#include <assimp/Importer.hpp>
#include <assimp/importerdesc.h>
#include <assimp/IOStreamBuffer.h>
#include <assimp/IOSystem.hpp>
#include <assimp/scene.h>
#include <assimp/StringUtils.h>
#include <assimp/StreamReader.h>

#include "tydra/render-data.hh"
#include "tydra/scene-access.hh"
#include "tydra/shader-network.hh"
#include "USDLoaderImplTinyusdz.h"
#include "USDLoaderUtil.h"

namespace Assimp {
using namespace std;

void USDImporterImplTinyusdz::InternReadFile(
        const std::string &pFile,
        aiScene *pScene,
        IOSystem *pIOHandler) {
    bool ret{false};
    tinyusdz::USDLoadOptions options;
    tinyusdz::Stage stage;
    std::string warn, err;
    if (isUsdc(pFile)) {
        ret = LoadUSDCFromFile(pFile, &stage, &warn, &err, options);
    } else if(isUsda(pFile)) {
        ret = LoadUSDAFromFile(pFile, &stage, &warn, &err, options);
    } else if(isUsdz(pFile)) {
        ret = LoadUSDZFromFile(pFile, &stage, &warn, &err, options);
    } else if(isUsd(pFile)) {
        ret = LoadUSDFromFile(pFile, &stage, &warn, &err, options);
    }
    if (!ret) {
        return;
    }
    tinyusdz::tydra::RenderScene render_scene;
    tinyusdz::tydra::RenderSceneConverter converter;
    ret = converter.ConvertToRenderScene(stage, &render_scene);
    if (!ret) {
        return;
    }
    pScene->mNumMeshes = render_scene.meshes.size();
    pScene->mMeshes = new aiMesh *[pScene->mNumMeshes]();
    // Create root node
    pScene->mRootNode = new aiNode();
    pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
    pScene->mRootNode->mMeshes = new unsigned int[pScene->mRootNode->mNumMeshes];

    // Export meshes
    for (size_t i = 0; i < pScene->mNumMeshes; i++) {
        pScene->mMeshes[i] = new aiMesh();
        pScene->mRootNode->mMeshes[i] = static_cast<unsigned int>(i);
    }
}

} // namespace Assimp

#endif // !! ASSIMP_BUILD_NO_USD_IMPORTER