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>
#include <sstream>

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

namespace {
    const char *const TAG = "USDLoaderImplTinyusdz (C++)";
}

namespace Assimp {
using namespace std;

void USDImporterImplTinyusdz::InternReadFile(
        const std::string &pFile,
        aiScene *pScene,
        IOSystem *pIOHandler) {
    // Grab filename for logging purposes
    size_t pos = pFile.find_last_of('/');
    string nameWExt = pFile.substr(pos + 1);
    (void) TAG; // Ignore unused variable when -Werror enabled

    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 meshIdx = 0; meshIdx < pScene->mNumMeshes; meshIdx++) {
        pScene->mMeshes[meshIdx] = new aiMesh();
        pScene->mMeshes[meshIdx]->mName.Set(render_scene.meshes[meshIdx].element_name);
        verticesForMesh(render_scene, pScene, meshIdx);
        facesForMesh(render_scene, pScene, meshIdx);
        normalsForMesh(render_scene, pScene, meshIdx);
        materialsForMesh(render_scene, pScene, meshIdx);
        uvsForMesh(render_scene, pScene, meshIdx);
        pScene->mRootNode->mMeshes[meshIdx] = static_cast<unsigned int>(meshIdx);
    }
    nodes(render_scene, pScene);
    materials(render_scene, pScene);
    textures(render_scene, pScene);
    textureImages(render_scene, pScene);
    buffers(render_scene, pScene);
    animations(render_scene, pScene);
}

void USDImporterImplTinyusdz::verticesForMesh(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene,
        size_t meshIdx) {
    pScene->mMeshes[meshIdx]->mNumVertices = render_scene.meshes[meshIdx].points.size();
    pScene->mMeshes[meshIdx]->mVertices = new aiVector3D[pScene->mMeshes[meshIdx]->mNumVertices];
    for (size_t j = 0; j < pScene->mMeshes[meshIdx]->mNumVertices; ++j) {
        pScene->mMeshes[meshIdx]->mVertices[j].x = render_scene.meshes[meshIdx].points[j][0];
        pScene->mMeshes[meshIdx]->mVertices[j].y = render_scene.meshes[meshIdx].points[j][1];
        pScene->mMeshes[meshIdx]->mVertices[j].z = render_scene.meshes[meshIdx].points[j][2];
    }
}

void USDImporterImplTinyusdz::facesForMesh(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene,
        size_t meshIdx) {
    pScene->mMeshes[meshIdx]->mNumFaces = render_scene.meshes[meshIdx].faceVertexCounts.size();
    pScene->mMeshes[meshIdx]->mFaces = new aiFace[pScene->mMeshes[meshIdx]->mNumFaces]();
    size_t faceVertIdxOffset = 0;
    for (size_t faceIdx = 0; faceIdx < pScene->mMeshes[meshIdx]->mNumFaces; ++faceIdx) {
        pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices = render_scene.meshes[meshIdx].faceVertexCounts[faceIdx];
        pScene->mMeshes[meshIdx]->mFaces[faceIdx].mIndices = new unsigned int[pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices];
        for (size_t j = 0; j < pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices; ++j) {
            pScene->mMeshes[meshIdx]->mFaces[faceIdx].mIndices[j] =
                    render_scene.meshes[meshIdx].faceVertexIndices[j + faceVertIdxOffset];
        }
        faceVertIdxOffset += pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices;
    }
}

void USDImporterImplTinyusdz::normalsForMesh(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene,
        size_t meshIdx) {
    pScene->mMeshes[meshIdx]->mNormals = new aiVector3D[pScene->mMeshes[meshIdx]->mNumVertices];
    size_t faceVertIdxOffset = 0;
    for (size_t faceIdx = 0; faceIdx < pScene->mMeshes[meshIdx]->mNumFaces; ++faceIdx) {
        size_t vertIdx;
        for (size_t j = 0; j < pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices; ++j) {
            vertIdx = pScene->mMeshes[meshIdx]->mFaces[faceIdx].mIndices[j];
            pScene->mMeshes[meshIdx]->mNormals[vertIdx].x = render_scene.meshes[meshIdx].facevaryingNormals[faceVertIdxOffset + j][0];
            pScene->mMeshes[meshIdx]->mNormals[vertIdx].y = render_scene.meshes[meshIdx].facevaryingNormals[faceVertIdxOffset + j][1];
            pScene->mMeshes[meshIdx]->mNormals[vertIdx].z = render_scene.meshes[meshIdx].facevaryingNormals[faceVertIdxOffset + j][2];
        }
        faceVertIdxOffset += pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices;
    }
}

void USDImporterImplTinyusdz::materialsForMesh(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene,
        size_t meshIdx) {
}

void USDImporterImplTinyusdz::uvsForMesh(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene,
        size_t meshIdx) {
    const size_t uvSlotsCount = render_scene.meshes[meshIdx].facevaryingTexcoords.size();
    if (uvSlotsCount < 1) {
        return;
    }
    const auto uvsForSlot0 = render_scene.meshes[meshIdx].facevaryingTexcoords.at(0);
    pScene->mMeshes[meshIdx]->mNumUVComponents[0] = uvSlotsCount;
    pScene->mMeshes[meshIdx]->mTextureCoords[0] = new aiVector3D[pScene->mMeshes[meshIdx]->mNumVertices];
    for (size_t uvSlotIdx = 0; uvSlotIdx < pScene->mMeshes[meshIdx]->mNumUVComponents[0]; ++uvSlotIdx) {
        const auto uvsForSlot = render_scene.meshes[meshIdx].facevaryingTexcoords.at(uvSlotIdx);
        size_t faceVertIdxOffset = 0;
        for (size_t faceIdx = 0; faceIdx < pScene->mMeshes[meshIdx]->mNumFaces; ++faceIdx) {
            for (size_t j = 0; j < pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices; ++j) {
                size_t vertIdx = pScene->mMeshes[meshIdx]->mFaces[faceIdx].mIndices[j];
                pScene->mMeshes[meshIdx]->mTextureCoords[uvSlotIdx][vertIdx].x = uvsForSlot[faceVertIdxOffset + j][0];
                pScene->mMeshes[meshIdx]->mTextureCoords[uvSlotIdx][vertIdx].y = uvsForSlot[faceVertIdxOffset + j][1];
            }
            faceVertIdxOffset += pScene->mMeshes[meshIdx]->mFaces[faceIdx].mNumIndices;
        }
    }
}

void USDImporterImplTinyusdz::nodes(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numNodes{render_scene.nodes.size()};
    (void) numNodes; // Ignore unused variable when -Werror enabled
}

void USDImporterImplTinyusdz::materials(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numMaterials{render_scene.materials.size()};
    (void) numMaterials; // Ignore unused variable when -Werror enabled
}

void USDImporterImplTinyusdz::textures(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numTextures{render_scene.textures.size()};
    (void) numTextures; // Ignore unused variable when -Werror enabled
}

void USDImporterImplTinyusdz::textureImages(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numTextureImages{render_scene.images.size()};
    (void) numTextureImages; // Ignore unused variable when -Werror enabled
}

void USDImporterImplTinyusdz::buffers(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numBuffers{render_scene.buffers.size()};
    (void) numBuffers; // Ignore unused variable when -Werror enabled
}

void USDImporterImplTinyusdz::animations(
        const tinyusdz::tydra::RenderScene &render_scene,
        aiScene *pScene) {
    const size_t numAnimations{render_scene.animations.size()};
    (void) numAnimations; // Ignore unused variable when -Werror enabled
}

} // namespace Assimp

#endif // !! ASSIMP_BUILD_NO_USD_IMPORTER