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assimp/code/ColladaParser.cpp

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/** Implementation of the Collada parser helper*/
/*
---------------------------------------------------------------------------
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"
#ifndef ASSIMP_BUILD_NO_DAE_IMPORTER
#include "ColladaParser.h"
#include "fast_atof.h"
#include "ParsingUtils.h"
using namespace Assimp;
using namespace Assimp::Collada;
// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
ColladaParser::ColladaParser( const std::string& pFile)
: mFileName( pFile)
{
mRootNode = NULL;
mUnitSize = 1.0f;
mUpDirection = UP_Z;
// generate a XML reader for it
mReader = irr::io::createIrrXMLReader( pFile.c_str());
if( !mReader)
ThrowException( "Unable to open file.");
// start reading
ReadContents();
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well
ColladaParser::~ColladaParser()
{
delete mReader;
for( NodeLibrary::iterator it = mNodeLibrary.begin(); it != mNodeLibrary.end(); ++it)
delete it->second;
for( MeshLibrary::iterator it = mMeshLibrary.begin(); it != mMeshLibrary.end(); ++it)
delete it->second;
}
// ------------------------------------------------------------------------------------------------
// Reads the contents of the file
void ColladaParser::ReadContents()
{
while( mReader->read())
{
// handle the root element "COLLADA"
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "COLLADA"))
{
ReadStructure();
} else
{
DefaultLogger::get()->debug( boost::str( boost::format( "Ignoring global element \"%s\".") % mReader->getNodeName()));
SkipElement();
}
} else
{
// skip everything else silently
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads the structure of the file
void ColladaParser::ReadStructure()
{
while( mReader->read())
{
// beginning of elements
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "asset"))
ReadAssetInfo();
else if( IsElement( "library_images"))
ReadImageLibrary();
else if( IsElement( "library_materials"))
ReadMaterialLibrary();
else if( IsElement( "library_effects"))
ReadEffectLibrary();
else if( IsElement( "library_geometries"))
ReadGeometryLibrary();
else if( IsElement( "library_visual_scenes"))
ReadSceneLibrary();
else if( IsElement( "scene"))
ReadScene();
else
SkipElement();
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads asset informations such as coordinate system informations and legal blah
void ColladaParser::ReadAssetInfo()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "unit"))
{
// read unit data from the element's attributes
int attrIndex = GetAttribute( "meter");
mUnitSize = mReader->getAttributeValueAsFloat( attrIndex);
// consume the trailing stuff
if( !mReader->isEmptyElement())
SkipElement();
}
else if( IsElement( "up_axis"))
{
// read content, strip whitespace, compare
const char* content = GetTextContent();
if( strncmp( content, "X_UP", 4) == 0)
mUpDirection = UP_X;
else if( strncmp( content, "Y_UP", 4) == 0)
mUpDirection = UP_Y;
else
mUpDirection = UP_Z;
// check element end
TestClosing( "up_axis");
} else
{
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "asset") != 0)
ThrowException( "Expected end of \"asset\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads the image library contents
void ColladaParser::ReadImageLibrary()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "image"))
{
// read ID. Another entry which is "optional" by design but obligatory in reality
int attrID = GetAttribute( "id");
std::string id = mReader->getAttributeValue( attrID);
// create an entry and store it in the library under its ID
mImageLibrary[id] = Image();
// read on from there
ReadImage( mImageLibrary[id]);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "library_images") != 0)
ThrowException( "Expected end of \"library_images\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads an image entry into the given image
void ColladaParser::ReadImage( Collada::Image& pImage)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "init_from"))
{
// element content is filename - hopefully
const char* content = GetTextContent();
pImage.mFileName = content;
TestClosing( "init_from");
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "image") != 0)
ThrowException( "Expected end of \"image\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads the material library
void ColladaParser::ReadMaterialLibrary()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "material"))
{
// read ID. By now you propably know my opinion about this "specification"
int attrID = GetAttribute( "id");
std::string id = mReader->getAttributeValue( attrID);
// create an entry and store it in the library under its ID
mMaterialLibrary[id] = Material();
// read on from there
ReadMaterial( mMaterialLibrary[id]);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "library_materials") != 0)
ThrowException( "Expected end of \"library_materials\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a material entry into the given material
void ColladaParser::ReadMaterial( Collada::Material& pMaterial)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "instance_effect"))
{
// referred effect by URL
int attrUrl = GetAttribute( "url");
const char* url = mReader->getAttributeValue( attrUrl);
if( url[0] != '#')
ThrowException( "Unknown reference format");
pMaterial.mEffect = url+1;
SkipElement();
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "material") != 0)
ThrowException( "Expected end of \"image\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads the effect library
void ColladaParser::ReadEffectLibrary()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "effect"))
{
// read ID. Do I have to repeat my ranting about "optional" attributes?
int attrID = GetAttribute( "id");
std::string id = mReader->getAttributeValue( attrID);
// create an entry and store it in the library under its ID
mEffectLibrary[id] = Effect();
// read on from there
ReadEffect( mEffectLibrary[id]);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "library_effects") != 0)
ThrowException( "Expected end of \"library_effects\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads an effect entry into the given effect
void ColladaParser::ReadEffect( Collada::Effect& pEffect)
{
// for the moment we don't support any other type of effect.
// TODO: (thom) Rewrite this so that it ignores the whole effect instead of bailing out
TestOpening( "profile_COMMON");
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "newparam"))
{
// save ID
int attrSID = GetAttribute( "sid");
std::string sid = mReader->getAttributeValue( attrSID);
pEffect.mParams[sid] = EffectParam();
ReadEffectParam( pEffect.mParams[sid]);
}
else if( IsElement( "technique"))
{
// just syntactic sugar
}
else if( IsElement( "phong"))
pEffect.mShadeType = Shade_Phong;
else if( IsElement( "constant"))
pEffect.mShadeType = Shade_Constant;
else if( IsElement( "lambert"))
pEffect.mShadeType = Shade_Lambert;
else if( IsElement( "blinn"))
pEffect.mShadeType = Shade_Blinn;
else if( IsElement( "emission"))
ReadEffectColor( pEffect.mEmissive, pEffect.mTexEmissive);
else if( IsElement( "ambient"))
ReadEffectColor( pEffect.mAmbient, pEffect.mTexAmbient);
else if( IsElement( "diffuse"))
ReadEffectColor( pEffect.mDiffuse, pEffect.mTexDiffuse);
else if( IsElement( "specular"))
ReadEffectColor( pEffect.mSpecular, pEffect.mTexSpecular);
else if( IsElement( "reflective")){
std::string buf;
ReadEffectColor( pEffect.mReflective, buf);
}
else if( IsElement( "transparent")){
std::string buf;
ReadEffectColor( pEffect.mRefractive,buf);
}
else if( IsElement( "shininess"))
ReadEffectFloat( pEffect.mShininess);
else if( IsElement( "reflectivity"))
ReadEffectFloat( pEffect.mReflectivity);
else if( IsElement( "transparency"))
ReadEffectFloat( pEffect.mRefractivity);
else if( IsElement( "index_of_refraction"))
ReadEffectFloat( pEffect.mRefractIndex);
else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "effect") == 0)
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads an effect entry containing a color or a texture defining that color
void ColladaParser::ReadEffectColor( aiColor4D& pColor, std::string& pSampler)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "color"))
{
// text content contains 4 floats
const char* content = GetTextContent();
float fBuf;
content = fast_atof_move( content, fBuf);
pColor.r = fBuf;
SkipSpacesAndLineEnd( &content);
content = fast_atof_move( content, fBuf);
pColor.g = fBuf;
SkipSpacesAndLineEnd( &content);
content = fast_atof_move( content, fBuf);
pColor.b = fBuf;
SkipSpacesAndLineEnd( &content);
content = fast_atof_move( content, fBuf);
pColor.a = fBuf;
SkipSpacesAndLineEnd( &content);
TestClosing( "color");
}
else if( IsElement( "texture"))
{
int attrTex = GetAttribute( "texture");
pSampler = mReader->getAttributeValue( attrTex);
SkipElement();
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads an effect entry containing a float
void ColladaParser::ReadEffectFloat( float& pFloat)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "float"))
{
// text content contains a single floats
const char* content = GetTextContent();
content = fast_atof_move( content, pFloat);
SkipSpacesAndLineEnd( &content);
TestClosing( "float");
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads an effect parameter specification of any kind
void ColladaParser::ReadEffectParam( Collada::EffectParam& pParam)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "surface"))
{
// image ID given inside <init_from> tags
TestOpening( "init_from");
const char* content = GetTextContent();
pParam.mType = Param_Surface;
pParam.mReference = content;
TestClosing( "init_from");
// don't care for remaining stuff
SkipElement( "surface");
}
else if( IsElement( "sampler2D"))
{
// surface ID is given inside <source> tags
TestOpening( "source");
const char* content = GetTextContent();
pParam.mType = Param_Sampler;
pParam.mReference = content;
TestClosing( "source");
// don't care for remaining stuff
SkipElement( "sampler2D");
} else
{
// ignore unknown element
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads the geometry library contents
void ColladaParser::ReadGeometryLibrary()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "geometry"))
{
// read ID. Another entry which is "optional" by design but obligatory in reality
int indexID = GetAttribute( "id");
std::string id = mReader->getAttributeValue( indexID);
// TODO: (thom) support SIDs
assert( TestAttribute( "sid") == -1);
// create a mesh and store it in the library under its ID
Mesh* mesh = new Mesh;
mMeshLibrary[id] = mesh;
// read on from there
ReadGeometry( mesh);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "library_geometries") != 0)
ThrowException( "Expected end of \"library_geometries\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a geometry from the geometry library.
void ColladaParser::ReadGeometry( Collada::Mesh* pMesh)
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "mesh"))
{
// read on from there
ReadMesh( pMesh);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "geometry") != 0)
ThrowException( "Expected end of \"geometry\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a mesh from the geometry library
void ColladaParser::ReadMesh( Mesh* pMesh)
{
// I'm doing a dirty state parsing here because I don't want to open another submethod for it.
// There's a <source> tag defining the name for the accessor inside, and possible a <float_array>
// with it's own ID. This string contains the current source's ID if parsing is inside a <source> element.
std::string presentSourceID;
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "source"))
{
// beginning of a source element - store ID for the inner elements
int attrID = GetAttribute( "id");
presentSourceID = mReader->getAttributeValue( attrID);
}
else if( IsElement( "float_array"))
{
ReadFloatArray();
}
else if( IsElement( "technique_common"))
{
// I don't fucking care for your profiles bullshit
}
else if( IsElement( "accessor"))
{
ReadAccessor( presentSourceID);
}
else if( IsElement( "vertices"))
{
// read per-vertex mesh data
ReadVertexData( pMesh);
}
else if( IsElement( "triangles") || IsElement( "lines") || IsElement( "linestrips")
|| IsElement( "polygons") || IsElement( "polylist") || IsElement( "trifans") || IsElement( "tristrips"))
{
// read per-index mesh data and faces setup
ReadIndexData( pMesh);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "source") == 0)
{
// end of <source> - reset present source ID
presentSourceID.clear();
}
else if( strcmp( mReader->getNodeName(), "technique_common") == 0)
{
// end of another meaningless element - read over it
}
else if( strcmp( mReader->getNodeName(), "mesh") == 0)
{
// end of <mesh> element - we're done here
break;
} else
{
// everything else should be punished
ThrowException( "Expected end of \"mesh\" element.");
}
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a data array holding a number of floats, and stores it in the global library
void ColladaParser::ReadFloatArray()
{
// read attributes
int indexID = GetAttribute( "id");
std::string id = mReader->getAttributeValue( indexID);
int indexCount = GetAttribute( "count");
unsigned int count = (unsigned int) mReader->getAttributeValueAsInt( indexCount);
const char* content = GetTextContent();
// read values and store inside an array in the data library
mDataLibrary[id] = Data();
Data& data = mDataLibrary[id];
data.mValues.reserve( count);
for( unsigned int a = 0; a < count; a++)
{
if( *content == 0)
ThrowException( "Expected more values while reading float_array contents.");
float value;
// read a number
content = fast_atof_move( content, value);
data.mValues.push_back( value);
// skip whitespace after it
SkipSpacesAndLineEnd( &content);
}
// test for closing tag
TestClosing( "float_array");
}
// ------------------------------------------------------------------------------------------------
// Reads an accessor and stores it in the global library
void ColladaParser::ReadAccessor( const std::string& pID)
{
// read accessor attributes
int attrSource = GetAttribute( "source");
const char* source = mReader->getAttributeValue( attrSource);
if( source[0] != '#')
ThrowException( boost::str( boost::format( "Unknown reference format in url \"%s\".") % source));
int attrCount = GetAttribute( "count");
unsigned int count = (unsigned int) mReader->getAttributeValueAsInt( attrCount);
int attrOffset = TestAttribute( "offset");
unsigned int offset = 0;
if( attrOffset > -1)
offset = (unsigned int) mReader->getAttributeValueAsInt( attrOffset);
int attrStride = TestAttribute( "stride");
unsigned int stride = 1;
if( attrStride > -1)
stride = (unsigned int) mReader->getAttributeValueAsInt( attrStride);
// store in the library under the given ID
mAccessorLibrary[pID] = Accessor();
Accessor& acc = mAccessorLibrary[pID];
acc.mCount = count;
acc.mOffset = offset;
acc.mStride = stride;
acc.mSource = source+1; // ignore the leading '#'
// and read the components
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "param"))
{
// read data param
int attrName = TestAttribute( "name");
std::string name;
if( attrName > -1)
{
name = mReader->getAttributeValue( attrName);
// analyse for common type components and store it's sub-offset in the corresponding field
if( name == "X") acc.mSubOffset[0] = acc.mParams.size();
else if( name == "Y") acc.mSubOffset[1] = acc.mParams.size();
else if( name == "Z") acc.mSubOffset[2] = acc.mParams.size();
else if( name == "R") acc.mSubOffset[0] = acc.mParams.size();
else if( name == "G") acc.mSubOffset[1] = acc.mParams.size();
else if( name == "B") acc.mSubOffset[2] = acc.mParams.size();
else if( name == "A") acc.mSubOffset[3] = acc.mParams.size();
else if( name == "S") acc.mSubOffset[0] = acc.mParams.size();
else if( name == "T") acc.mSubOffset[1] = acc.mParams.size();
else
DefaultLogger::get()->warn( boost::str( boost::format( "Unknown accessor parameter \"%s\". Ignoring data channel.") % name));
}
acc.mParams.push_back( name);
// skip remaining stuff of this element, if any
SkipElement();
} else
{
ThrowException( "Unexpected sub element in tag \"accessor\".");
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "accessor") != 0)
ThrowException( "Expected end of \"accessor\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads input declarations of per-vertex mesh data into the given mesh
void ColladaParser::ReadVertexData( Mesh* pMesh)
{
// extract the ID of the <vertices> element. Not that we care, but to catch strange referencing schemes we should warn about
int attrID= GetAttribute( "id");
pMesh->mVertexID = mReader->getAttributeValue( attrID);
// a number of <input> elements
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "input"))
{
ReadInputChannel( pMesh->mPerVertexData);
} else
{
ThrowException( "Unexpected sub element in tag \"vertices\".");
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "vertices") != 0)
ThrowException( "Expected end of \"vertices\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads input declarations of per-index mesh data into the given mesh
void ColladaParser::ReadIndexData( Mesh* pMesh)
{
std::vector<size_t> vcount;
std::vector<InputChannel> perIndexData;
// read primitive count from the attribute
int attrCount = GetAttribute( "count");
size_t numPrimitives = (size_t) mReader->getAttributeValueAsInt( attrCount);
// material subgroup
int attrMaterial = TestAttribute( "material");
SubMesh subgroup;
if( attrMaterial > -1)
subgroup.mMaterial = mReader->getAttributeValue( attrMaterial);
subgroup.mNumFaces = numPrimitives;
pMesh->mSubMeshes.push_back( subgroup);
// distinguish between polys and triangles
std::string elementName = mReader->getNodeName();
PrimitiveType primType = Prim_Invalid;
if( IsElement( "lines"))
primType = Prim_Lines;
else if( IsElement( "linestrips"))
primType = Prim_LineStrip;
else if( IsElement( "polygons"))
primType = Prim_Polygon;
else if( IsElement( "polylist"))
primType = Prim_Polylist;
else if( IsElement( "triangles"))
primType = Prim_Triangles;
else if( IsElement( "trifans"))
primType = Prim_TriFans;
else if( IsElement( "tristrips"))
primType = Prim_TriStrips;
assert( primType != Prim_Invalid);
// also a number of <input> elements, but in addition a <p> primitive collection and propably index counts for all primitives
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "input"))
{
ReadInputChannel( perIndexData);
}
else if( IsElement( "vcount"))
{
if( !mReader->isEmptyElement())
{
// case <polylist> - specifies the number of indices for each polygon
const char* content = GetTextContent();
vcount.reserve( numPrimitives);
for( unsigned int a = 0; a < numPrimitives; a++)
{
if( *content == 0)
ThrowException( "Expected more values while reading vcount contents.");
// read a number
vcount.push_back( (size_t) strtol10( content, &content));
// skip whitespace after it
SkipSpacesAndLineEnd( &content);
}
TestClosing( "vcount");
}
}
else if( IsElement( "p"))
{
if( !mReader->isEmptyElement())
{
// now here the actual fun starts - these are the indices to construct the mesh data from
ReadPrimitives( pMesh, perIndexData, numPrimitives, vcount, primType);
}
} else
{
ThrowException( "Unexpected sub element in tag \"vertices\".");
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( mReader->getNodeName() != elementName)
ThrowException( boost::str( boost::format( "Expected end of \"%s\" element.") % elementName));
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a single input channel element and stores it in the given array, if valid
void ColladaParser::ReadInputChannel( std::vector<InputChannel>& poChannels)
{
InputChannel channel;
// read semantic
int attrSemantic = GetAttribute( "semantic");
std::string semantic = mReader->getAttributeValue( attrSemantic);
channel.mType = GetTypeForSemantic( semantic);
// read source
int attrSource = GetAttribute( "source");
const char* source = mReader->getAttributeValue( attrSource);
if( source[0] != '#')
ThrowException( boost::str( boost::format( "Unknown reference format in url \"%s\".") % source));
channel.mAccessor = source+1; // skipping the leading #, hopefully the remaining text is the accessor ID only
// read index offset, if per-index <input>
int attrOffset = TestAttribute( "offset");
if( attrOffset > -1)
channel.mOffset = mReader->getAttributeValueAsInt( attrOffset);
// store, if valid type
if( channel.mType != IT_Invalid)
poChannels.push_back( channel);
// skip remaining stuff of this element, if any
SkipElement();
}
// ------------------------------------------------------------------------------------------------
// Reads a <p> primitive index list and assembles the mesh data into the given mesh
void ColladaParser::ReadPrimitives( Mesh* pMesh, std::vector<InputChannel>& pPerIndexChannels,
size_t pNumPrimitives, const std::vector<size_t>& pVCount, PrimitiveType pPrimType)
{
// determine number of indices coming per vertex
// find the offset index for all per-vertex channels
size_t numOffsets = 1;
size_t perVertexOffset = -1; // invalid value
BOOST_FOREACH( const InputChannel& channel, pPerIndexChannels)
{
numOffsets = std::max( numOffsets, channel.mOffset+1);
if( channel.mType == IT_Vertex)
perVertexOffset = channel.mOffset;
}
// determine the expected number of indices
size_t expectedPointCount = 0;
switch( pPrimType)
{
case Prim_Polylist:
{
BOOST_FOREACH( size_t i, pVCount)
expectedPointCount += i;
break;
}
case Prim_Lines:
expectedPointCount = 2 * pNumPrimitives;
break;
case Prim_Triangles:
expectedPointCount = 3 * pNumPrimitives;
break;
default:
// other primitive types don't state the index count upfront... we need to guess
break;
}
// and read all indices into a temporary array
std::vector<size_t> indices;
if( expectedPointCount > 0)
indices.reserve( expectedPointCount * numOffsets);
const char* content = GetTextContent();
while( *content != 0)
{
// read a value
unsigned int value = strtol10( content, &content);
indices.push_back( size_t( value));
// skip whitespace after it
SkipSpacesAndLineEnd( &content);
}
// complain if the index count doesn't fit
if( expectedPointCount > 0 && indices.size() != expectedPointCount * numOffsets)
ThrowException( "Expected different index count in <p> element.");
else if( expectedPointCount == 0 && (indices.size() % numOffsets) != 0)
ThrowException( "Expected different index count in <p> element.");
// find the data for all sources
BOOST_FOREACH( InputChannel& input, pMesh->mPerVertexData)
{
if( input.mResolved)
continue;
// find accessor
input.mResolved = &ResolveLibraryReference( mAccessorLibrary, input.mAccessor);
// resolve accessor's data pointer as well, if neccessary
const Accessor* acc = input.mResolved;
if( !acc->mData)
acc->mData = &ResolveLibraryReference( mDataLibrary, acc->mSource);
}
// and the same for the per-index channels
BOOST_FOREACH( InputChannel& input, pPerIndexChannels)
{
if( input.mResolved)
continue;
// ignore vertex pointer, it doesn't refer to an accessor
if( input.mType == IT_Vertex)
{
// warn if the vertex channel does not refer to the <vertices> element in the same mesh
if( input.mAccessor != pMesh->mVertexID)
ThrowException( "Unsupported vertex referencing scheme. I fucking hate Collada.");
continue;
}
// find accessor
input.mResolved = &ResolveLibraryReference( mAccessorLibrary, input.mAccessor);
// resolve accessor's data pointer as well, if neccessary
const Accessor* acc = input.mResolved;
if( !acc->mData)
acc->mData = &ResolveLibraryReference( mDataLibrary, acc->mSource);
}
// now assemble vertex data according to those indices
std::vector<size_t>::const_iterator idx = indices.begin();
// For continued primitives, the given count does not come all in one <p>, but only one primitive per <p>
size_t numPrimitives = pNumPrimitives;
if( pPrimType == Prim_TriFans || pPrimType == Prim_Polygon)
numPrimitives = 1;
for( size_t a = 0; a < numPrimitives; a++)
{
// determine number of points for this primitive
size_t numPoints = 0;
switch( pPrimType)
{
case Prim_Lines: numPoints = 2; break;
case Prim_Triangles: numPoints = 3; break;
case Prim_Polylist: numPoints = pVCount[a]; break;
case Prim_TriFans:
case Prim_Polygon: numPoints = indices.size() / numOffsets; break;
default:
// LineStrip and TriStrip not supported due to expected index unmangling
ThrowException( "Unsupported primitive type.");
break;
}
// store the face size to later reconstruct the face from
pMesh->mFaceSize.push_back( numPoints);
// gather that number of vertices
for( size_t b = 0; b < numPoints; b++)
{
// read all indices for this vertex. Yes, in a hacky static array
assert( numOffsets < 20);
static size_t vindex[20];
for( size_t offsets = 0; offsets < numOffsets; ++offsets)
vindex[offsets] = *idx++;
// extract per-vertex channels using the global per-vertex offset
BOOST_FOREACH( const InputChannel& input, pMesh->mPerVertexData)
ExtractDataObjectFromChannel( input, vindex[perVertexOffset], pMesh);
// and extract per-index channels using there specified offset
BOOST_FOREACH( const InputChannel& input, pPerIndexChannels)
ExtractDataObjectFromChannel( input, vindex[input.mOffset], pMesh);
}
}
// if I ever get my hands on that guy who invented this steaming pile of indirection...
TestClosing( "p");
}
// ------------------------------------------------------------------------------------------------
// Extracts a single object from an input channel and stores it in the appropriate mesh data array
void ColladaParser::ExtractDataObjectFromChannel( const InputChannel& pInput, size_t pLocalIndex, Mesh* pMesh)
{
// ignore vertex referrer - we handle them that separate
if( pInput.mType == IT_Vertex)
return;
const Accessor& acc = *pInput.mResolved;
if( pLocalIndex >= acc.mCount)
ThrowException( boost::str( boost::format( "Invalid data index (%d/%d) in primitive specification") % pLocalIndex % acc.mCount));
// get a pointer to the start of the data object referred to by the accessor and the local index
const float* dataObject = &(acc.mData->mValues[0]) + acc.mOffset + pLocalIndex* acc.mStride;
// assemble according to the accessors component sub-offset list. We don't care, yet, what kind of object exactly we're extracting here
float obj[4];
for( size_t c = 0; c < 4; ++c)
obj[c] = dataObject[acc.mSubOffset[c]];
// now we reinterpret it according to the type we're reading here
switch( pInput.mType)
{
case IT_Position: // ignore all position streams except 0 - there can be only one position
if( pInput.mIndex == 0)
pMesh->mPositions.push_back( aiVector3D( obj[0], obj[1], obj[2]));
break;
case IT_Normal: // ignore all normal streams except 0 - there can be only one normal
if( pInput.mIndex == 0)
pMesh->mNormals.push_back( aiVector3D( obj[0], obj[1], obj[2]));
break;
case IT_Texcoord: // up to 4 texture coord sets are fine, ignore the others
if( pInput.mIndex < AI_MAX_NUMBER_OF_TEXTURECOORDS)
pMesh->mTexCoords[pInput.mIndex].push_back( aiVector2D( obj[0], obj[1]));
break;
case IT_Color: // up to 4 color sets are fine, ignore the others
if( pInput.mIndex < AI_MAX_NUMBER_OF_COLOR_SETS)
pMesh->mColors[pInput.mIndex].push_back( aiColor4D( obj[0], obj[1], obj[2], obj[3]));
break;
}
}
// ------------------------------------------------------------------------------------------------
// Reads the library of node hierarchies and scene parts
void ColladaParser::ReadSceneLibrary()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
// a visual scene - generate root node under its ID and let ReadNode() do the recursive work
if( IsElement( "visual_scene"))
{
// read ID. Is optional according to the spec, but how on earth should a scene_instance refer to it then?
int indexID = GetAttribute( "id");
const char* attrID = mReader->getAttributeValue( indexID);
// read name if given.
int indexName = TestAttribute( "name");
const char* attrName = "unnamed";
if( indexName > -1)
attrName = mReader->getAttributeValue( indexName);
// TODO: (thom) support SIDs
assert( TestAttribute( "sid") == -1);
// create a node and store it in the library under its ID
Node* node = new Node;
node->mID = attrID;
node->mName = attrName;
mNodeLibrary[node->mID] = node;
ReadSceneNode( node);
} else
{
// ignore the rest
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "library_visual_scenes") != 0)
ThrowException( "Expected end of \"library_visual_scenes\" element.");
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a scene node's contents including children and stores it in the given node
void ColladaParser::ReadSceneNode( Node* pNode)
{
// quit immediately on <bla/> elements
if( mReader->isEmptyElement())
return;
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "lookat"))
ReadNodeTransformation( pNode, TF_LOOKAT);
else if( IsElement( "matrix"))
ReadNodeTransformation( pNode, TF_MATRIX);
else if( IsElement( "rotate"))
ReadNodeTransformation( pNode, TF_ROTATE);
else if( IsElement( "scale"))
ReadNodeTransformation( pNode, TF_SCALE);
else if( IsElement( "skew"))
ReadNodeTransformation( pNode, TF_SKEW);
else if( IsElement( "translate"))
ReadNodeTransformation( pNode, TF_TRANSLATE);
else if( IsElement( "node"))
{
Node* child = new Node;
int attrID = TestAttribute( "id");
if( attrID > -1)
child->mID = mReader->getAttributeValue( attrID);
int attrName = TestAttribute( "name");
if( attrName > -1)
child->mName = mReader->getAttributeValue( attrName);
// TODO: (thom) support SIDs
// assert( TestAttribute( "sid") == -1);
pNode->mChildren.push_back( child);
child->mParent = pNode;
// read on recursively from there
ReadSceneNode( child);
} else if( IsElement( "instance_node"))
{
// test for it, in case we need to implement it
assert( false);
SkipElement();
} else if( IsElement( "instance_geometry"))
{
// Reference to a mesh, we possible material associations
ReadNodeGeometry( pNode);
} else
{
// skip everything else for the moment
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Reads a node transformation entry of the given type and adds it to the given node's transformation list.
void ColladaParser::ReadNodeTransformation( Node* pNode, TransformType pType)
{
std::string tagName = mReader->getNodeName();
// how many parameters to read per transformation type
static const unsigned int sNumParameters[] = { 9, 4, 3, 3, 7, 16 };
const char* content = GetTextContent();
// read as many parameters and store in the transformation
Transform tf;
tf.mType = pType;
for( unsigned int a = 0; a < sNumParameters[pType]; a++)
{
// read a number
content = fast_atof_move( content, tf.f[a]);
// skip whitespace after it
SkipSpacesAndLineEnd( &content);
}
// place the transformation at the queue of the node
pNode->mTransforms.push_back( tf);
// and consum the closing tag
TestClosing( tagName.c_str());
}
// ------------------------------------------------------------------------------------------------
// Reads a mesh reference in a node and adds it to the node's mesh list
void ColladaParser::ReadNodeGeometry( Node* pNode)
{
// referred mesh is given as an attribute of the <instance_geometry> element
int attrUrl = GetAttribute( "url");
const char* url = mReader->getAttributeValue( attrUrl);
if( url[0] != '#')
ThrowException( "Unknown reference format");
Collada::MeshInstance instance;
instance.mMesh = url+1; // skipping the leading #
if( !mReader->isEmptyElement())
{
// read material associations. Ignore additional elements inbetween
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "instance_material"))
{
// read ID of the geometry subgroup and the target material
int attrGroup = GetAttribute( "symbol");
std::string group = mReader->getAttributeValue( attrGroup);
int attrMaterial = GetAttribute( "target");
const char* urlMat = mReader->getAttributeValue( attrMaterial);
if( urlMat[0] != '#')
ThrowException( "Unknown reference format");
std::string mat = urlMat+1;
// store the association
instance.mMaterials[group] = mat;
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
if( strcmp( mReader->getNodeName(), "instance_geometry") == 0)
break;
}
}
}
// store it
pNode->mMeshes.push_back( instance);
}
// ------------------------------------------------------------------------------------------------
// Reads the collada scene
void ColladaParser::ReadScene()
{
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
{
if( IsElement( "instance_visual_scene"))
{
// should be the first and only occurence
if( mRootNode)
ThrowException( "Invalid scene containing multiple root nodes");
// read the url of the scene to instance. Should be of format "#some_name"
int urlIndex = GetAttribute( "url");
const char* url = mReader->getAttributeValue( urlIndex);
if( url[0] != '#')
ThrowException( "Unknown reference format");
// find the referred scene, skip the leading #
NodeLibrary::const_iterator sit = mNodeLibrary.find( url+1);
if( sit == mNodeLibrary.end())
ThrowException( boost::str( boost::format( "Unable to resolve visual_scene reference \"%s\".") % url));
mRootNode = sit->second;
} else
{
SkipElement();
}
}
else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
{
break;
}
}
}
// ------------------------------------------------------------------------------------------------
// Aborts the file reading with an exception
void ColladaParser::ThrowException( const std::string& pError) const
{
throw new ImportErrorException( boost::str( boost::format( "%s - %s") % mFileName % pError));
}
// ------------------------------------------------------------------------------------------------
// Skips all data until the end node of the current element
void ColladaParser::SkipElement()
{
// nothing to skip if it's an <element />
if( mReader->isEmptyElement())
return;
// reroute
SkipElement( mReader->getNodeName());
}
// ------------------------------------------------------------------------------------------------
// Skips all data until the end node of the given element
void ColladaParser::SkipElement( const char* pElement)
{
// copy the current node's name because it'a pointer to the reader's internal buffer,
// which is going to change with the upcoming parsing
std::string element = pElement;
while( mReader->read())
{
if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END)
if( mReader->getNodeName() == element)
break;
}
}
// ------------------------------------------------------------------------------------------------
// Tests for an opening element of the given name, throws an exception if not found
void ColladaParser::TestOpening( const char* pName)
{
// read element start
if( !mReader->read())
ThrowException( boost::str( boost::format( "Unexpected end of file while beginning of \"%s\" element.") % pName));
// whitespace in front is ok, just read again if found
if( mReader->getNodeType() == irr::io::EXN_TEXT)
if( !mReader->read())
ThrowException( boost::str( boost::format( "Unexpected end of file while reading beginning of \"%s\" element.") % pName));
if( mReader->getNodeType() != irr::io::EXN_ELEMENT || strcmp( mReader->getNodeName(), pName) != 0)
ThrowException( boost::str( boost::format( "Expected start of \"%s\" element.") % pName));
}
// ------------------------------------------------------------------------------------------------
// Tests for the closing tag of the given element, throws an exception if not found
void ColladaParser::TestClosing( const char* pName)
{
// read closing tag
if( !mReader->read())
ThrowException( boost::str( boost::format( "Unexpected end of file while reading end of \"%s\" element.") % pName));
// whitespace in front is ok, just read again if found
if( mReader->getNodeType() == irr::io::EXN_TEXT)
if( !mReader->read())
ThrowException( boost::str( boost::format( "Unexpected end of file while reading end of \"%s\" element.") % pName));
if( mReader->getNodeType() != irr::io::EXN_ELEMENT_END || strcmp( mReader->getNodeName(), pName) != 0)
ThrowException( boost::str( boost::format( "Expected end of \"%s\" element.") % pName));
}
// ------------------------------------------------------------------------------------------------
// Returns the index of the named attribute or -1 if not found. Does not throw, therefore useful for optional attributes
int ColladaParser::GetAttribute( const char* pAttr) const
{
int index = TestAttribute( pAttr);
if( index != -1)
return index;
// attribute not found -> throw an exception
ThrowException( boost::str( boost::format( "Expected attribute \"%s\" at element \"%s\".") % pAttr % mReader->getNodeName()));
return -1;
}
// ------------------------------------------------------------------------------------------------
// Tests the present element for the presence of one attribute, returns its index or throws an exception if not found
int ColladaParser::TestAttribute( const char* pAttr) const
{
for( int a = 0; a < mReader->getAttributeCount(); a++)
if( strcmp( mReader->getAttributeName( a), pAttr) == 0)
return a;
return -1;
}
// ------------------------------------------------------------------------------------------------
// Reads the text contents of an element, throws an exception if not given. Skips leading whitespace.
const char* ColladaParser::GetTextContent()
{
// present node should be the beginning of an element
if( mReader->getNodeType() != irr::io::EXN_ELEMENT || mReader->isEmptyElement())
ThrowException( "Expected opening element");
// read contents of the element
if( !mReader->read())
ThrowException( "Unexpected end of file while reading asset up_axis element.");
if( mReader->getNodeType() != irr::io::EXN_TEXT)
ThrowException( "Invalid contents in element \"up_axis\".");
// skip leading whitespace
const char* text = mReader->getNodeData();
SkipSpacesAndLineEnd( &text);
return text;
}
// ------------------------------------------------------------------------------------------------
// Calculates the resulting transformation fromm all the given transform steps
aiMatrix4x4 ColladaParser::CalculateResultTransform( const std::vector<Transform>& pTransforms) const
{
aiMatrix4x4 res;
for( std::vector<Transform>::const_iterator it = pTransforms.begin(); it != pTransforms.end(); ++it)
{
const Transform& tf = *it;
switch( tf.mType)
{
case TF_LOOKAT:
// TODO: (thom)
assert( false);
break;
case TF_ROTATE:
{
aiMatrix4x4 rot;
float angle = tf.f[3] * float( AI_MATH_PI) / 180.0f;
aiVector3D axis( tf.f[0], tf.f[1], tf.f[2]);
aiMatrix4x4::Rotation( angle, axis, rot);
res *= rot;
break;
}
case TF_TRANSLATE:
{
aiMatrix4x4 trans;
aiMatrix4x4::Translation( aiVector3D( tf.f[0], tf.f[1], tf.f[2]), trans);
res *= trans;
break;
}
case TF_SCALE:
{
aiMatrix4x4 scale( tf.f[0], 0.0f, 0.0f, 0.0f, 0.0f, tf.f[1], 0.0f, 0.0f, 0.0f, 0.0f, tf.f[2], 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
res *= scale;
break;
}
case TF_SKEW:
// TODO: (thom)
assert( false);
break;
case TF_MATRIX:
{
aiMatrix4x4 mat( tf.f[0], tf.f[1], tf.f[2], tf.f[3], tf.f[4], tf.f[5], tf.f[6], tf.f[7],
tf.f[8], tf.f[9], tf.f[10], tf.f[11], tf.f[12], tf.f[13], tf.f[14], tf.f[15]);
res *= mat;
break;
}
default:
assert( false);
break;
}
}
return res;
}
// ------------------------------------------------------------------------------------------------
// Determines the input data type for the given semantic string
Collada::InputType ColladaParser::GetTypeForSemantic( const std::string& pSemantic)
{
if( pSemantic == "POSITION")
return IT_Position;
else if( pSemantic == "TEXCOORD")
return IT_Texcoord;
else if( pSemantic == "NORMAL")
return IT_Normal;
else if( pSemantic == "COLOR")
return IT_Color;
else if( pSemantic == "VERTEX")
return IT_Vertex;
DefaultLogger::get()->warn( boost::str( boost::format( "Unknown vertex input type \"%s\". Ignoring.") % pSemantic));
return IT_Invalid;
}
#endif // !! ASSIMP_BUILD_NO_DAE_IMPORTER
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