assimp/code/ColladaLoader.cpp

380 lines
15 KiB
C++

/** Implementation of the Collada loader */
/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------
Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.
Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the following
conditions are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other
materials provided with the distribution.
* Neither the name of the ASSIMP team, nor the names of its
contributors may be used to endorse or promote products
derived from this software without specific prior
written permission of the ASSIMP Development Team.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/
#include "AssimpPCH.h"
#include "../include/aiAnim.h"
#include "ColladaLoader.h"
#include "ColladaParser.h"
using namespace Assimp;
// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
ColladaLoader::ColladaLoader()
{
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well
ColladaLoader::~ColladaLoader()
{
}
// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file.
bool ColladaLoader::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
// check file extension
std::string::size_type pos = pFile.find_last_of('.');
// no file extension - can't read
if( pos == std::string::npos)
return false;
std::string extension = pFile.substr( pos);
for( std::string::iterator it = extension.begin(); it != extension.end(); ++it)
*it = tolower( *it);
if( extension == ".dae")
return true;
return false;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void ColladaLoader::InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
mFileName = pFile;
// parse the input file
ColladaParser parser( pFile);
if( !parser.mRootNode)
throw new ImportErrorException( "File came out empty. Somethings wrong here.");
// create the materials first, for the meshes to find
BuildMaterials( parser, pScene);
// build the node hierarchy from it
pScene->mRootNode = BuildHierarchy( parser, parser.mRootNode);
// Convert to Z_UP, if different orientation
if( parser.mUpDirection == ColladaParser::UP_X)
pScene->mRootNode->mTransformation *= aiMatrix4x4(
0, -1, 0, 0,
0, 0, -1, 0,
1, 0, 0, 0,
0, 0, 0, 1);
else if( parser.mUpDirection == ColladaParser::UP_Y)
pScene->mRootNode->mTransformation *= aiMatrix4x4(
1, 0, 0, 0,
0, 0, -1, 0,
0, 1, 0, 0,
0, 0, 0, 1);
// store all meshes
StoreSceneMeshes( pScene);
}
// ------------------------------------------------------------------------------------------------
// Recursively constructs a scene node for the given parser node and returns it.
aiNode* ColladaLoader::BuildHierarchy( const ColladaParser& pParser, const Collada::Node* pNode)
{
// create a node for it
aiNode* node = new aiNode( pNode->mName);
// calculate the transformation matrix for it
node->mTransformation = pParser.CalculateResultTransform( pNode->mTransforms);
// add children
node->mNumChildren = pNode->mChildren.size();
node->mChildren = new aiNode*[node->mNumChildren];
for( unsigned int a = 0; a < pNode->mChildren.size(); a++)
{
node->mChildren[a] = BuildHierarchy( pParser, pNode->mChildren[a]);
node->mChildren[a]->mParent = node;
}
// construct meshes
BuildMeshesForNode( pParser, pNode, node);
return node;
}
// ------------------------------------------------------------------------------------------------
// Builds meshes for the given node and references them
void ColladaLoader::BuildMeshesForNode( const ColladaParser& pParser, const Collada::Node* pNode, aiNode* pTarget)
{
// accumulated mesh references by this node
std::vector<size_t> newMeshRefs;
// for the moment we simply ignore all material tags and transfer the meshes one by one
BOOST_FOREACH( const Collada::MeshInstance& mid, pNode->mMeshes)
{
// find the referred mesh
ColladaParser::MeshLibrary::const_iterator srcMeshIt = pParser.mMeshLibrary.find( mid.mMesh);
if( srcMeshIt == pParser.mMeshLibrary.end())
{
DefaultLogger::get()->warn( boost::str( boost::format( "Unable to find geometry for ID \"%s\". Skipping.") % mid.mMesh));
continue;
}
const Collada::Mesh* srcMesh = srcMeshIt->second;
// build a mesh for each of its subgroups
size_t vertexStart = 0, faceStart = 0;
for( size_t sm = 0; sm < srcMesh->mSubMeshes.size(); ++sm)
{
const Collada::SubMesh& submesh = srcMesh->mSubMeshes[sm];
// find material assigned to this submesh
std::map<std::string, std::string>::const_iterator meshMatIt = mid.mMaterials.find( submesh.mMaterial);
std::string meshMaterial;
if( meshMatIt != mid.mMaterials.end())
meshMaterial = meshMatIt->second;
else
DefaultLogger::get()->warn( boost::str( boost::format( "No material specified for subgroup \"%s\" in geometry \"%s\".") % submesh.mMaterial % mid.mMesh));
// built lookup index of the Mesh-Submesh-Material combination
ColladaMeshIndex index( mid.mMesh, sm, meshMaterial);
// if we already have the mesh at the library, just add its index to the node's array
std::map<ColladaMeshIndex, size_t>::const_iterator dstMeshIt = mMeshIndexByID.find( index);
if( dstMeshIt != mMeshIndexByID.end())
{
newMeshRefs.push_back( dstMeshIt->second);
} else
{
// else we have to add the mesh to the collection and store its newly assigned index at the node
aiMesh* dstMesh = new aiMesh;
// count the vertices addressed by its faces
size_t numVertices =
std::accumulate( srcMesh->mFaceSize.begin() + faceStart, srcMesh->mFaceSize.begin() + faceStart + submesh.mNumFaces, 0);
// copy positions
dstMesh->mNumVertices = numVertices;
dstMesh->mVertices = new aiVector3D[numVertices];
std::copy( srcMesh->mPositions.begin() + vertexStart, srcMesh->mPositions.begin() + vertexStart + numVertices, dstMesh->mVertices);
// normals, if given. HACK: (thom) Due to the fucking Collada spec we never know if we have the same
// number of normals as there are positions. So we also ignore any vertex attribute if it has a different count
if( srcMesh->mNormals.size() == srcMesh->mPositions.size())
{
dstMesh->mNormals = new aiVector3D[numVertices];
std::copy( srcMesh->mNormals.begin() + vertexStart, srcMesh->mNormals.begin() + vertexStart + numVertices, dstMesh->mNormals);
}
// same for texturecoords, as many as we have
for( size_t a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++)
{
if( srcMesh->mTexCoords[a].size() == srcMesh->mPositions.size())
{
dstMesh->mTextureCoords[a] = new aiVector3D[numVertices];
for( size_t b = vertexStart; b < vertexStart + numVertices; ++b)
dstMesh->mTextureCoords[a][b].Set( srcMesh->mTexCoords[a][b].x, srcMesh->mTexCoords[a][b].y, 0.0f);
dstMesh->mNumUVComponents[a] = 2;
}
}
// same for vertex colors, as many as we have
for( size_t a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++)
{
if( srcMesh->mColors[a].size() == srcMesh->mPositions.size())
{
dstMesh->mColors[a] = new aiColor4D[numVertices];
std::copy( srcMesh->mColors[a].begin() + vertexStart, srcMesh->mColors[a].begin() + vertexStart + numVertices, dstMesh->mColors[a]);
}
}
// create faces. Due to the fact that each face uses unique vertices, we can simply count up on each vertex
size_t vertex = 0;
dstMesh->mNumFaces = submesh.mNumFaces;
dstMesh->mFaces = new aiFace[dstMesh->mNumFaces];
for( size_t a = 0; a < dstMesh->mNumFaces; ++a)
{
size_t s = srcMesh->mFaceSize[ faceStart + a];
aiFace& face = dstMesh->mFaces[a];
face.mNumIndices = s;
face.mIndices = new unsigned int[s];
for( size_t b = 0; b < s; ++b)
face.mIndices[b] = vertex++;
}
// store the mesh, and store its new index in the node
newMeshRefs.push_back( mMeshes.size());
mMeshIndexByID[index] = mMeshes.size();
mMeshes.push_back( dstMesh);
vertexStart += numVertices; faceStart += submesh.mNumFaces;
// assign the material index
std::map<std::string, size_t>::const_iterator matIt = mMaterialIndexByName.find( meshMaterial);
if( matIt != mMaterialIndexByName.end())
dstMesh->mMaterialIndex = matIt->second;
else
dstMesh->mMaterialIndex = 0;
}
}
}
// now place all mesh references we gathered in the target node
pTarget->mNumMeshes = newMeshRefs.size();
if( newMeshRefs.size())
{
pTarget->mMeshes = new unsigned int[pTarget->mNumMeshes];
std::copy( newMeshRefs.begin(), newMeshRefs.end(), pTarget->mMeshes);
}
}
// ------------------------------------------------------------------------------------------------
// Stores all meshes in the given scene
void ColladaLoader::StoreSceneMeshes( aiScene* pScene)
{
pScene->mNumMeshes = mMeshes.size();
if( mMeshes.size() > 0)
{
pScene->mMeshes = new aiMesh*[mMeshes.size()];
std::copy( mMeshes.begin(), mMeshes.end(), pScene->mMeshes);
}
}
// ------------------------------------------------------------------------------------------------
// Constructs materials from the collada material definitions
void ColladaLoader::BuildMaterials( const ColladaParser& pParser, aiScene* pScene)
{
std::vector<aiMaterial*> newMats;
for( ColladaParser::MaterialLibrary::const_iterator matIt = pParser.mMaterialLibrary.begin(); matIt != pParser.mMaterialLibrary.end(); ++matIt)
{
const Collada::Material& material = matIt->second;
// a material is only a reference to an effect
ColladaParser::EffectLibrary::const_iterator effIt = pParser.mEffectLibrary.find( material.mEffect);
if( effIt == pParser.mEffectLibrary.end())
continue;
const Collada::Effect& effect = effIt->second;
// create material
Assimp::MaterialHelper* mat = new Assimp::MaterialHelper;
aiString name( matIt->first);
mat->AddProperty( &name, AI_MATKEY_NAME);
int shadeMode;
switch( effect.mShadeType)
{
case Collada::Shade_Constant: shadeMode = aiShadingMode_NoShading; break;
case Collada::Shade_Lambert: shadeMode = aiShadingMode_Gouraud; break;
case Collada::Shade_Blinn: shadeMode = aiShadingMode_Blinn; break;
default: shadeMode = aiShadingMode_Phong; break;
}
mat->AddProperty<int>( &shadeMode, 1, AI_MATKEY_SHADING_MODEL);
mat->AddProperty( &effect.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
mat->AddProperty( &effect.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
mat->AddProperty( &effect.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
mat->AddProperty( &effect.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);
mat->AddProperty( &effect.mShininess, 1, AI_MATKEY_SHININESS);
mat->AddProperty( &effect.mRefractIndex, 1, AI_MATKEY_REFRACTI);
// add textures, if given
if( !effect.mTexAmbient.empty())
mat->AddProperty( &FindFilenameForEffectTexture( pParser, effect, effect.mTexAmbient), AI_MATKEY_TEXTURE_AMBIENT( 0));
if( !effect.mTexDiffuse.empty())
mat->AddProperty( &FindFilenameForEffectTexture( pParser, effect, effect.mTexDiffuse), AI_MATKEY_TEXTURE_DIFFUSE( 0));
if( !effect.mTexEmissive.empty())
mat->AddProperty( &FindFilenameForEffectTexture( pParser, effect, effect.mTexEmissive), AI_MATKEY_TEXTURE_EMISSIVE( 0));
if( !effect.mTexSpecular.empty())
mat->AddProperty( &FindFilenameForEffectTexture( pParser, effect, effect.mTexSpecular), AI_MATKEY_TEXTURE_SPECULAR( 0));
// store the material
mMaterialIndexByName[matIt->first] = newMats.size();
newMats.push_back( mat);
}
// store a dummy material if none were given
if( newMats.size() == 0)
{
Assimp::MaterialHelper* mat = new Assimp::MaterialHelper;
aiString name( std::string( "dummy"));
mat->AddProperty( &name, AI_MATKEY_NAME);
int shadeMode = aiShadingMode_Phong;
mat->AddProperty<int>( &shadeMode, 1, AI_MATKEY_SHADING_MODEL);
aiColor4D colAmbient( 0.2f, 0.2f, 0.2f, 1.0f), colDiffuse( 0.8f, 0.8f, 0.8f, 1.0f), colSpecular( 0.5f, 0.5f, 0.5f, 0.5f);
mat->AddProperty( &colAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
mat->AddProperty( &colDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
mat->AddProperty( &colSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
float specExp = 5.0f;
mat->AddProperty( &specExp, 1, AI_MATKEY_SHININESS);
}
// store the materials in the scene
pScene->mNumMaterials = newMats.size();
pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
std::copy( newMats.begin(), newMats.end(), pScene->mMaterials);
}
// ------------------------------------------------------------------------------------------------
// Resolves the texture name for the given effect texture entry
const aiString& ColladaLoader::FindFilenameForEffectTexture( const ColladaParser& pParser, const Collada::Effect& pEffect, const std::string& pName)
{
// recurse through the param references until we end up at an image
std::string name = pName;
while( 1)
{
// the given string is a param entry. Find it
Collada::Effect::ParamLibrary::const_iterator it = pEffect.mParams.find( name);
// if not found, we're at the end of the recursion. The resulting string should be the image ID
if( it == pEffect.mParams.end())
break;
// else recurse on
name = it->second.mReference;
}
// find the image referred by this name in the image library of the scene
ColladaParser::ImageLibrary::const_iterator imIt = pParser.mImageLibrary.find( name);
if( imIt == pParser.mImageLibrary.end())
throw new ImportErrorException( boost::str( boost::format( "Unable to resolve effect texture entry \"%s\", ended up at ID \"%s\".") % pName % name));
static aiString result;
result.Set( imIt->second.mFileName);
return result;
}