367 lines
12 KiB
C++
367 lines
12 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2016, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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#ifndef ASSIMP_BUILD_NO_EXPORT
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#ifndef ASSIMP_BUILD_NO_GLTF_EXPORTER
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#include "glTFExporter.h"
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#include "Exceptional.h"
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#include "StringComparison.h"
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#include "ByteSwapper.h"
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#include <assimp/version.h>
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#include <assimp/IOSystem.hpp>
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#include <assimp/Exporter.hpp>
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#include <assimp/material.h>
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#include <assimp/scene.h>
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#include <memory>
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#include "glTFAssetWriter.h"
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using namespace rapidjson;
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using namespace Assimp;
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using namespace glTF;
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namespace Assimp {
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// ------------------------------------------------------------------------------------------------
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// Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp
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void ExportSceneGLTF(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
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{
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// invoke the exporter
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glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, false);
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}
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// ------------------------------------------------------------------------------------------------
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// Worker function for exporting a scene to GLB. Prototyped and registered in Exporter.cpp
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void ExportSceneGLB(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
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{
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// invoke the exporter
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glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, true);
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}
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} // end of namespace Assimp
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glTFExporter::glTFExporter(const char* filename, IOSystem* pIOSystem, const aiScene* pScene,
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const ExportProperties* pProperties, bool isBinary)
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: mFilename(filename)
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, mIOSystem(pIOSystem)
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, mScene(pScene)
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, mProperties(pProperties)
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{
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std::unique_ptr<Asset> asset(new glTF::Asset(pIOSystem));
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mAsset = asset.get();
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if (isBinary) {
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asset->SetAsBinary();
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}
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ExportMetadata();
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//for (unsigned int i = 0; i < pScene->mNumAnimations; ++i) {}
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//for (unsigned int i = 0; i < pScene->mNumCameras; ++i) {}
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//for (unsigned int i = 0; i < pScene->mNumLights; ++i) {}
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ExportMaterials();
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ExportMeshes();
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//for (unsigned int i = 0; i < pScene->mNumTextures; ++i) {}
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if (mScene->mRootNode) {
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ExportNode(mScene->mRootNode);
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}
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ExportScene();
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glTF::AssetWriter writer(*mAsset);
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writer.WriteFile(filename);
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}
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static void CopyValue(const aiMatrix4x4& v, glTF::mat4& o)
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{
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o[ 0] = v.a1; o[ 1] = v.b1; o[ 2] = v.c1; o[ 3] = v.d1;
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o[ 4] = v.a2; o[ 5] = v.b2; o[ 6] = v.c2; o[ 7] = v.d2;
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o[ 8] = v.a3; o[ 9] = v.b3; o[10] = v.c3; o[11] = v.d3;
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o[12] = v.a4; o[13] = v.b4; o[14] = v.c4; o[15] = v.d4;
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}
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inline Ref<Accessor> ExportData(Asset& a, std::string& meshName, Ref<Buffer>& buffer,
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unsigned int count, void* data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, bool isIndices = false)
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{
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if (!count || !data) return Ref<Accessor>();
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unsigned int numCompsIn = AttribType::GetNumComponents(typeIn);
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unsigned int numCompsOut = AttribType::GetNumComponents(typeOut);
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unsigned int bytesPerComp = ComponentTypeSize(compType);
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size_t offset = buffer->byteLength;
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size_t length = count * numCompsOut * bytesPerComp;
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buffer->Grow(length);
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// bufferView
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Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
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bv->buffer = buffer;
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bv->byteOffset = unsigned(offset);
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bv->byteLength = length; //! The target that the WebGL buffer should be bound to.
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bv->target = isIndices ? BufferViewTarget_ELEMENT_ARRAY_BUFFER : BufferViewTarget_ARRAY_BUFFER;
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// accessor
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Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
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acc->bufferView = bv;
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acc->byteOffset = 0;
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acc->byteStride = 0;
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acc->componentType = compType;
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acc->count = count;
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acc->type = typeOut;
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// copy the data
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acc->WriteData(count, data, numCompsIn*bytesPerComp);
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return acc;
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}
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namespace {
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void GetMatScalar(const aiMaterial* mat, float& val, const char* propName, int type, int idx) {
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if (mat->Get(propName, type, idx, val) == AI_SUCCESS) {}
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}
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}
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void glTFExporter::GetMatColorOrTex(const aiMaterial* mat, glTF::TexProperty& prop, const char* propName, int type, int idx, aiTextureType tt)
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{
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aiString tex;
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aiColor4D col;
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if (mat->GetTextureCount(tt) > 0) {
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if (mat->Get(AI_MATKEY_TEXTURE(tt, 0), tex) == AI_SUCCESS) {
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std::string path = tex.C_Str();
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if (path.size() > 0) {
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if (path[0] != '*') {
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std::map<std::string, unsigned int>::iterator it = mTexturesByPath.find(path);
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if (it != mTexturesByPath.end()) {
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prop.texture = mAsset->textures.Get(it->second);
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}
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}
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if (!prop.texture) {
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std::string texId = mAsset->FindUniqueID("", "texture");
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prop.texture = mAsset->textures.Create(texId);
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mTexturesByPath[path] = prop.texture.GetIndex();
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std::string imgId = mAsset->FindUniqueID("", "image");
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prop.texture->source = mAsset->images.Create(imgId);
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if (path[0] == '*') { // embedded
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aiTexture* tex = mScene->mTextures[atoi(&path[1])];
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uint8_t* data = reinterpret_cast<uint8_t*>(tex->pcData);
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prop.texture->source->SetData(data, tex->mWidth, *mAsset);
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if (tex->achFormatHint[0]) {
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std::string mimeType = "image/";
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mimeType += (memcmp(tex->achFormatHint, "jpg", 3) == 0) ? "jpeg" : tex->achFormatHint;
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prop.texture->source->mimeType = mimeType;
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}
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}
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else {
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prop.texture->source->uri = path;
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}
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}
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}
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}
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}
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if (mat->Get(propName, type, idx, col) == AI_SUCCESS) {
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prop.color[0] = col.r; prop.color[1] = col.g; prop.color[2] = col.b; prop.color[3] = col.a;
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}
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}
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void glTFExporter::ExportMaterials()
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{
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aiString aiName;
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for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) {
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const aiMaterial* mat = mScene->mMaterials[i];
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std::string name;
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if (mat->Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) {
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name = aiName.C_Str();
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}
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name = mAsset->FindUniqueID(name, "material");
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Ref<Material> m = mAsset->materials.Create(name);
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GetMatColorOrTex(mat, m->ambient, AI_MATKEY_COLOR_AMBIENT, aiTextureType_AMBIENT);
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GetMatColorOrTex(mat, m->diffuse, AI_MATKEY_COLOR_DIFFUSE, aiTextureType_DIFFUSE);
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GetMatColorOrTex(mat, m->specular, AI_MATKEY_COLOR_SPECULAR, aiTextureType_SPECULAR);
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GetMatColorOrTex(mat, m->emission, AI_MATKEY_COLOR_EMISSIVE, aiTextureType_EMISSIVE);
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GetMatScalar(mat, m->shininess, AI_MATKEY_SHININESS);
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}
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}
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void glTFExporter::ExportMeshes()
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{
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for (unsigned int i = 0; i < mScene->mNumMeshes; ++i) {
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const aiMesh* aim = mScene->mMeshes[i];
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std::string meshId = mAsset->FindUniqueID(aim->mName.C_Str(), "mesh");
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Ref<Mesh> m = mAsset->meshes.Create(meshId);
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m->primitives.resize(1);
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Mesh::Primitive& p = m->primitives.back();
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p.material = mAsset->materials.Get(aim->mMaterialIndex);
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std::string bufferId = mAsset->FindUniqueID(meshId, "buffer");
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Ref<Buffer> b = mAsset->GetBodyBuffer();
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if (!b) {
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b = mAsset->buffers.Create(bufferId);
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}
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Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
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if (v) p.attributes.position.push_back(v);
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Ref<Accessor> n = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mNormals, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
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if (n) p.attributes.normal.push_back(n);
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for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
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if (aim->mNumUVComponents[i] > 0) {
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AttribType::Value type = (aim->mNumUVComponents[i] == 2) ? AttribType::VEC2 : AttribType::VEC3;
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Ref<Accessor> tc = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mTextureCoords[i], AttribType::VEC3, type, ComponentType_FLOAT, true);
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if (tc) p.attributes.texcoord.push_back(tc);
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}
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}
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if (aim->mNumFaces > 0) {
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unsigned int nIndicesPerFace = aim->mFaces[0].mNumIndices;
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std::vector<uint16_t> indices;
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indices.resize(aim->mNumFaces * nIndicesPerFace);
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for (size_t i = 0; i < aim->mNumFaces; ++i) {
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for (size_t j = 0; j < nIndicesPerFace; ++j) {
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indices[i*nIndicesPerFace + j] = uint16_t(aim->mFaces[i].mIndices[j]);
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}
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}
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p.indices = ExportData(*mAsset, meshId, b, unsigned(indices.size()), &indices[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_UNSIGNED_SHORT, true);
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}
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switch (aim->mPrimitiveTypes) {
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case aiPrimitiveType_POLYGON:
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p.mode = PrimitiveMode_TRIANGLES; break; // TODO implement this
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case aiPrimitiveType_LINE:
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p.mode = PrimitiveMode_LINES; break;
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case aiPrimitiveType_POINT:
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p.mode = PrimitiveMode_POINTS; break;
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default: // aiPrimitiveType_TRIANGLE
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p.mode = PrimitiveMode_TRIANGLES;
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}
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}
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}
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unsigned int glTFExporter::ExportNode(const aiNode* n)
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{
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Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
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if (!n->mTransformation.IsIdentity()) {
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node->matrix.isPresent = true;
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CopyValue(n->mTransformation, node->matrix.value);
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}
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for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
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node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i]));
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}
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for (unsigned int i = 0; i < n->mNumChildren; ++i) {
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unsigned int idx = ExportNode(n->mChildren[i]);
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node->children.push_back(mAsset->nodes.Get(idx));
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}
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return node.GetIndex();
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}
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void glTFExporter::ExportScene()
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{
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const char* sceneName = "defaultScene";
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Ref<Scene> scene = mAsset->scenes.Create(sceneName);
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// root node will be the first one exported (idx 0)
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if (mAsset->nodes.Size() > 0) {
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scene->nodes.push_back(mAsset->nodes.Get(0u));
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}
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// set as the default scene
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mAsset->scene = scene;
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}
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void glTFExporter::ExportMetadata()
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{
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glTF::AssetMetadata& asset = mAsset->asset;
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asset.version = 1;
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char buffer[256];
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ai_snprintf(buffer, 256, "Open Asset Import Library (assimp v%d.%d.%d)",
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aiGetVersionMajor(), aiGetVersionMinor(), aiGetVersionRevision());
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asset.generator = buffer;
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}
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#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER
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#endif // ASSIMP_BUILD_NO_EXPORT
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