assimp.assimp/code/AssetLib/USD/USDLoader.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 "USDLoader.h"
#include "USDLoaderUtil.h"
#include "USDPreprocessor.h"

static constexpr aiImporterDesc desc = {
    "USD Object Importer",
    "",
    "",
    "https://en.wikipedia.org/wiki/Universal_Scene_Description/",
    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportBinaryFlavour,
    0,
    0,
    0,
    0,
    "usd usda usdc usdz"
};

namespace Assimp {
using namespace std;

// Constructor to be privately used by Importer
USDImporter::USDImporter() :
    impl(USDImporterImplTinyusdz()) {
}

// ------------------------------------------------------------------------------------------------

bool USDImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
    UNUSED(checkSig);
    // Based on token
    static const uint32_t usdcTokens[] = { AI_MAKE_MAGIC("PXR-USDC") };
    bool canRead = CheckMagicToken(pIOHandler, pFile, usdcTokens, AI_COUNT_OF(usdcTokens));
    if (canRead) {
        return canRead;
    }

    // Based on extension
    // TODO: confirm OK to replace this w/SimpleExtensionCheck() below
    canRead = isUsd(pFile) || isUsda(pFile) || isUsdc(pFile) || isUsdz(pFile);
    if (canRead) {
        return canRead;
    }
    canRead = SimpleExtensionCheck(pFile, "usd", "usda", "usdc", "usdz");
    return canRead;
}

const aiImporterDesc *USDImporter::GetInfo() const {
    return &desc;
}

void USDImporter::InternReadFile(
        const std::string &pFile,
        aiScene *pScene,
        IOSystem *pIOHandler) {
    impl.InternReadFile(
            pFile,
            pScene,
            pIOHandler);
}

} // namespace Assimp

#endif // !! ASSIMP_BUILD_NO_USD_IMPORTER