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irrlicht/source/Irrlicht/COBJMeshFileLoader.cpp
cutealien e7c7e36347 obj file loader now allows using mtl files with spaces in the filename. 
mtllib commands previously used only the first word, now they use the rest of the line.
Different obj format descriptions describe the mtllib command in 2 different ways:
- http://paulbourke.net says it can load several mtl files separated by spaces
- Wikipedia says it can load one mtl file (but there can be several mtllib commands)
We previously loaded 1 file - using the name up to the first space character, so it basically was not correct for either solution. We now go with Wikipedia, because it allows using space in filenames and I tested several other tools and they all handled it like this.

Also COBJMeshFileLoader::copyLine no longer copies the newline character (didn't do that always anyway and we don't need it)


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6275 dfc29bdd-3216-0410-991c-e03cc46cb475
2021-12-22 16:19:59 +00:00

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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "IrrCompileConfig.h"
#ifdef _IRR_COMPILE_WITH_OBJ_LOADER_
#include "COBJMeshFileLoader.h"
#include "CMeshTextureLoader.h"
#include "IMeshManipulator.h"
#include "IVideoDriver.h"
#include "SMesh.h"
#include "SMeshBuffer.h"
#include "SAnimatedMesh.h"
#include "IReadFile.h"
#include "IAttributes.h"
#include "fast_atof.h"
#include "coreutil.h"
#include "os.h"
namespace irr
{
namespace scene
{
#ifdef _DEBUG
#define _IRR_DEBUG_OBJ_LOADER_
#endif
static const u32 WORD_BUFFER_LENGTH = 512;
//! Constructor
COBJMeshFileLoader::COBJMeshFileLoader(scene::ISceneManager* smgr, io::IFileSystem* fs)
: SceneManager(smgr), FileSystem(fs)
{
#ifdef _DEBUG
setDebugName("COBJMeshFileLoader");
#endif
if (FileSystem)
FileSystem->grab();
TextureLoader = new CMeshTextureLoader( FileSystem, SceneManager->getVideoDriver() );
}
//! destructor
COBJMeshFileLoader::~COBJMeshFileLoader()
{
if (FileSystem)
FileSystem->drop();
}
//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".bsp")
bool COBJMeshFileLoader::isALoadableFileExtension(const io::path& filename) const
{
return core::hasFileExtension ( filename, "obj" );
}
//! creates/loads an animated mesh from the file.
//! \return Pointer to the created mesh. Returns 0 if loading failed.
//! If you no longer need the mesh, you should call IAnimatedMesh::drop().
//! See IReferenceCounted::drop() for more information.
IAnimatedMesh* COBJMeshFileLoader::createMesh(io::IReadFile* file)
{
if (!file)
return 0;
if ( getMeshTextureLoader() )
getMeshTextureLoader()->setMeshFile(file);
const long filesize = file->getSize();
if (!filesize)
return 0;
const u32 WORD_BUFFER_LENGTH = 512;
core::array<core::vector3df, core::irrAllocatorFast<core::vector3df> > vertexBuffer(1000);
core::array<core::vector3df, core::irrAllocatorFast<core::vector3df> > normalsBuffer(1000);
core::array<core::vector2df, core::irrAllocatorFast<core::vector2df> > textureCoordBuffer(1000);
SObjMtl * currMtl = new SObjMtl();
Materials.push_back(currMtl);
u32 smoothingGroup=0;
const io::path fullName = file->getFileName();
const io::path relPath = FileSystem->getFileDir(fullName)+"/";
c8* buf = new c8[filesize];
memset(buf, 0, filesize);
file->read((void*)buf, filesize);
const c8* const bufEnd = buf+filesize;
// Process obj information
const c8* bufPtr = buf;
core::stringc grpName, mtlName;
bool mtlChanged=false;
bool useGroups = !SceneManager->getParameters()->getAttributeAsBool(OBJ_LOADER_IGNORE_GROUPS);
bool useMaterials = !SceneManager->getParameters()->getAttributeAsBool(OBJ_LOADER_IGNORE_MATERIAL_FILES);
irr::u32 lineNr = 1; // only counts non-empty lines, still useful in debugging to locate errors
core::array<int> faceCorners;
faceCorners.reallocate(32); // should be large enough
const core::stringc TAG_OFF = "off";
irr::u32 degeneratedFaces = 0;
while(bufPtr != bufEnd)
{
switch(bufPtr[0])
{
case 'm': // mtllib (material)
{
if (useMaterials)
{
// Bit fuzzy definition. Some doc (http://paulbourke.net) says there can be more then one file and they are separated by spaces
// Other doc (Wikipedia) says it's one file. Which does allow loading mtl files with spaces in the name.
// Other tools I tested seem to go with the Wikipedia definition
// Irrlicht did just use first word in Irrlicht 1.8, but with 1.9 we switch to allowing filenames with spaces
// If this turns out to cause troubles we can maybe try to catch those cases by looking for ".mtl " inside the string
const c8 * inBuf = goNextWord(bufPtr, bufEnd, false);
core::stringc name = copyLine(inBuf, bufEnd);
#ifdef _IRR_DEBUG_OBJ_LOADER_
os::Printer::log("Reading material file",name);
#endif
readMTL(name.c_str(), relPath);
}
}
break;
case 'v': // v, vn, vt
switch(bufPtr[1])
{
case ' ': // vertex
{
core::vector3df vec;
bufPtr = readVec3(bufPtr, vec, bufEnd);
vertexBuffer.push_back(vec);
}
break;
case 'n': // normal
{
core::vector3df vec;
bufPtr = readVec3(bufPtr, vec, bufEnd);
normalsBuffer.push_back(vec);
}
break;
case 't': // texcoord
{
core::vector2df vec;
bufPtr = readUV(bufPtr, vec, bufEnd);
textureCoordBuffer.push_back(vec);
}
break;
}
break;
case 'g': // group name
{
c8 grp[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(grp, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
#ifdef _IRR_DEBUG_OBJ_LOADER_
os::Printer::log("Loaded group start",grp, ELL_DEBUG);
#endif
if (useGroups)
{
if (0 != grp[0])
grpName = grp;
else
grpName = "default";
}
mtlChanged=true;
}
break;
case 's': // smoothing can be a group or off (equiv. to 0)
{
c8 smooth[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(smooth, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
#ifdef _IRR_DEBUG_OBJ_LOADER_
os::Printer::log("Loaded smoothing group start",smooth, ELL_DEBUG);
#endif
if (TAG_OFF==smooth)
smoothingGroup=0;
else
smoothingGroup=core::strtoul10(smooth);
(void)smoothingGroup; // disable unused variable warnings
}
break;
case 'u': // usemtl
// get name of material
{
c8 matName[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(matName, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
#ifdef _IRR_DEBUG_OBJ_LOADER_
os::Printer::log("Loaded material start",matName, ELL_DEBUG);
#endif
mtlName=matName;
mtlChanged=true;
}
break;
case 'f': // face
{
c8 vertexWord[WORD_BUFFER_LENGTH]; // for retrieving vertex data
video::S3DVertex v;
// Assign vertex color from currently active material's diffuse color
if (mtlChanged)
{
// retrieve the material
SObjMtl *useMtl = findMtl(mtlName, grpName);
// only change material if we found it
if (useMtl)
currMtl = useMtl;
mtlChanged=false;
}
if (currMtl)
v.Color = currMtl->Meshbuffer->Material.DiffuseColor;
// get all vertices data in this face (current line of obj file)
const core::stringc wordBuffer = copyLine(bufPtr, bufEnd);
const c8* linePtr = wordBuffer.c_str();
const c8* const endPtr = linePtr+wordBuffer.size();
faceCorners.set_used(0); // fast clear
// read in all vertices
linePtr = goNextWord(linePtr, endPtr);
while (0 != linePtr[0])
{
// Array to communicate with retrieveVertexIndices()
// sends the buffer sizes and gets the actual indices
// if index not set returns -1
s32 Idx[3];
Idx[0] = Idx[1] = Idx[2] = -1;
// read in next vertex's data
u32 wlength = copyWord(vertexWord, linePtr, WORD_BUFFER_LENGTH, endPtr);
// this function will also convert obj's 1-based index to c++'s 0-based index
retrieveVertexIndices(vertexWord, Idx, vertexWord+wlength+1, vertexBuffer.size(), textureCoordBuffer.size(), normalsBuffer.size());
if ( -1 != Idx[0] && Idx[0] < (irr::s32)vertexBuffer.size() )
v.Pos = vertexBuffer[Idx[0]];
else
{
os::Printer::log("Invalid vertex index in this line:", wordBuffer.c_str(), ELL_ERROR);
delete [] buf;
return 0;
}
if ( -1 != Idx[1] && Idx[1] < (irr::s32)textureCoordBuffer.size() )
v.TCoords = textureCoordBuffer[Idx[1]];
else
v.TCoords.set(0.0f,0.0f);
if ( -1 != Idx[2] && Idx[2] < (irr::s32)normalsBuffer.size() )
v.Normal = normalsBuffer[Idx[2]];
else
{
v.Normal.set(0.0f,0.0f,0.0f);
currMtl->RecalculateNormals=true;
}
int vertLocation;
core::map<video::S3DVertex, int>::Node* n = currMtl->VertMap.find(v);
if (n)
{
vertLocation = n->getValue();
}
else
{
currMtl->Meshbuffer->Vertices.push_back(v);
vertLocation = currMtl->Meshbuffer->Vertices.size() -1;
currMtl->VertMap.insert(v, vertLocation);
}
faceCorners.push_back(vertLocation);
// go to next vertex
linePtr = goNextWord(linePtr, endPtr);
}
// triangulate the face
const int c = faceCorners[0];
for ( u32 i = 1; i < faceCorners.size() - 1; ++i )
{
// Add a triangle
const int a = faceCorners[i + 1];
const int b = faceCorners[i];
if (a != b && a != c && b != c) // ignore degenerated faces. We can get them when we merge vertices above in the VertMap.
{
currMtl->Meshbuffer->Indices.push_back(a);
currMtl->Meshbuffer->Indices.push_back(b);
currMtl->Meshbuffer->Indices.push_back(c);
}
else
{
++degeneratedFaces;
}
}
}
break;
case '#': // comment
default:
break;
} // end switch(bufPtr[0])
// eat up rest of line
bufPtr = goNextLine(bufPtr, bufEnd);
++lineNr;
} // end while(bufPtr && (bufPtr-buf<filesize))
if ( degeneratedFaces > 0 )
{
irr::core::stringc log(degeneratedFaces);
log += " degenerated faces removed in ";
log += irr::core::stringc(fullName);
os::Printer::log(log.c_str(), ELL_INFORMATION);
}
SMesh* mesh = new SMesh();
// Combine all the groups (meshbuffers) into the mesh
for ( u32 m = 0; m < Materials.size(); ++m )
{
if ( Materials[m]->Meshbuffer->getIndexCount() > 0 )
{
Materials[m]->Meshbuffer->recalculateBoundingBox();
if (Materials[m]->RecalculateNormals)
SceneManager->getMeshManipulator()->recalculateNormals(Materials[m]->Meshbuffer);
if (Materials[m]->Meshbuffer->Material.MaterialType == video::EMT_PARALLAX_MAP_SOLID)
{
SMesh tmp;
tmp.addMeshBuffer(Materials[m]->Meshbuffer);
IMesh* tangentMesh = SceneManager->getMeshManipulator()->createMeshWithTangents(&tmp);
mesh->addMeshBuffer(tangentMesh->getMeshBuffer(0));
tangentMesh->drop();
}
else
mesh->addMeshBuffer( Materials[m]->Meshbuffer );
}
}
// Create the Animated mesh if there's anything in the mesh
SAnimatedMesh* animMesh = 0;
if ( 0 != mesh->getMeshBufferCount() )
{
mesh->recalculateBoundingBox();
animMesh = new SAnimatedMesh();
animMesh->Type = EAMT_OBJ;
animMesh->addMesh(mesh);
animMesh->recalculateBoundingBox();
}
// Clean up the allocate obj file contents
delete [] buf;
// more cleaning up
cleanUp();
mesh->drop();
return animMesh;
}
const c8* COBJMeshFileLoader::readTextures(const c8* bufPtr, const c8* const bufEnd, SObjMtl* currMaterial, const io::path& relPath)
{
u8 type=0; // map_Kd - diffuse color texture map
// map_Ks - specular color texture map
// map_Ka - ambient color texture map
// map_Ns - shininess texture map
if ((!strncmp(bufPtr,"map_bump",8)) || (!strncmp(bufPtr,"bump",4)))
type=1; // normal map
else if ((!strncmp(bufPtr,"map_d",5)) || (!strncmp(bufPtr,"map_opacity",11)))
type=2; // opacity map
else if (!strncmp(bufPtr,"map_refl",8))
type=3; // reflection map
// extract new material's name
c8 textureNameBuf[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
f32 bumpiness = 6.0f;
bool clamp = false;
core::vector3df tscale(1.f); //For map_Kd texture scaling
core::vector3df tpos(0.f); //For map_Kd texture translation
// handle options
while (textureNameBuf[0]=='-')
{
if (!strncmp(bufPtr,"-bm",3))
{
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
currMaterial->Meshbuffer->Material.MaterialTypeParam=core::fast_atof(textureNameBuf);
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
continue;
}
else
if (!strncmp(bufPtr,"-blendu",7))
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
else
if (!strncmp(bufPtr,"-blendv",7))
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
else
if (!strncmp(bufPtr,"-cc",3))
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
else
if (!strncmp(bufPtr,"-clamp",6))
bufPtr = readBool(bufPtr, clamp, bufEnd);
else
if (!strncmp(bufPtr,"-texres",7))
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
else
if (!strncmp(bufPtr,"-type",5))
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
else
if (!strncmp(bufPtr,"-mm",3))
{
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
}
else
if (!strncmp(bufPtr,"-o",2)) // texture coord translation
{
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1])))
tpos.X = core::fast_atof(textureNameBuf);
// next parameters are optional, so skip rest of loop if no number is found
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
tpos.Y = core::fast_atof(textureNameBuf);
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
tpos.Z = core::fast_atof(textureNameBuf);
}
else
if (!strncmp(bufPtr,"-s",2)) // texture coord scale
{
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1])))
tscale.X = core::fast_atof(textureNameBuf);
// next parameters are optional, so skip rest of loop if no number is found
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
tscale.Y = core::fast_atof(textureNameBuf);
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
tscale.Z = core::fast_atof(textureNameBuf);
}
else
if (!strncmp(bufPtr,"-t",2))
{
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
// next parameters are optional, so skip rest of loop if no number is found
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
if (!(core::isdigit(textureNameBuf[0]) || (textureNameBuf[0] == '-' && core::isdigit(textureNameBuf[1]))))
continue;
}
// get next word
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
}
if ((type==1) && (core::isdigit(textureNameBuf[0])))
{
currMaterial->Meshbuffer->Material.MaterialTypeParam=core::fast_atof(textureNameBuf);
bufPtr = goAndCopyNextWord(textureNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
}
if (clamp)
currMaterial->Meshbuffer->Material.setFlag(video::EMF_TEXTURE_WRAP, video::ETC_CLAMP);
io::path texname(textureNameBuf);
if (texname.size() && getMeshTextureLoader())
{
video::ITexture * texture = getMeshTextureLoader()->getTexture(texname);
if ( texture )
{
if (type==0)
{
currMaterial->Meshbuffer->Material.setTexture(0, texture);
bool needsTextureMatrix = tscale != core::vector3df(1.f) || tpos != core::vector3df(0.f);
if (needsTextureMatrix)
{
currMaterial->Meshbuffer->Material.getTextureMatrix(0).setTextureScale(tscale.X, tscale.Y);
currMaterial->Meshbuffer->Material.getTextureMatrix(0).setTextureTranslate(tpos.X, tpos.Y);
}
}
else if (type==1)
{
if ( texture->getSource() == video::ETS_FROM_FILE)
SceneManager->getVideoDriver()->makeNormalMapTexture(texture, bumpiness);
currMaterial->Meshbuffer->Material.setTexture(1, texture);
currMaterial->Meshbuffer->Material.MaterialType=video::EMT_PARALLAX_MAP_SOLID;
currMaterial->Meshbuffer->Material.MaterialTypeParam=0.035f;
}
else if (type==2)
{
currMaterial->Meshbuffer->Material.setTexture(0, texture);
currMaterial->Meshbuffer->Material.MaterialType=video::EMT_TRANSPARENT_ADD_COLOR;
}
else if (type==3)
{
// currMaterial->Meshbuffer->Material.Textures[1] = texture;
// currMaterial->Meshbuffer->Material.MaterialType=video::EMT_REFLECTION_2_LAYER;
}
// Set diffuse material color to white so as not to affect texture color
// Because Maya set diffuse color Kd to black when you use a diffuse color map
// But is this the right thing to do?
currMaterial->Meshbuffer->Material.DiffuseColor.set(
currMaterial->Meshbuffer->Material.DiffuseColor.getAlpha(), 255, 255, 255 );
}
}
return bufPtr;
}
void COBJMeshFileLoader::readMTL(const c8* fileName, const io::path& relPath)
{
const io::path realFile(fileName);
io::IReadFile * mtlReader;
if (FileSystem->existFile(realFile))
mtlReader = FileSystem->createAndOpenFile(realFile);
else if (FileSystem->existFile(relPath + realFile))
mtlReader = FileSystem->createAndOpenFile(relPath + realFile);
else if (FileSystem->existFile(FileSystem->getFileBasename(realFile)))
mtlReader = FileSystem->createAndOpenFile(FileSystem->getFileBasename(realFile));
else
mtlReader = FileSystem->createAndOpenFile(relPath + FileSystem->getFileBasename(realFile));
if (!mtlReader) // fail to open and read file
{
os::Printer::log("Could not open material file", realFile, ELL_WARNING);
return;
}
if ( getMeshTextureLoader() )
{
getMeshTextureLoader()->setMaterialFile(mtlReader);
if ( SceneManager->getParameters()->existsAttribute(OBJ_TEXTURE_PATH) )
getMeshTextureLoader()->setTexturePath(SceneManager->getParameters()->getAttributeAsString(OBJ_TEXTURE_PATH));
}
const long filesize = mtlReader->getSize();
if (!filesize)
{
os::Printer::log("Skipping empty material file", realFile, ELL_INFORMATION); // it's fine some tools export empty mtl files
mtlReader->drop();
return;
}
c8* buf = new c8[filesize];
mtlReader->read((void*)buf, filesize);
const c8* bufEnd = buf+filesize;
SObjMtl* currMaterial = 0;
const c8* bufPtr = buf;
while(bufPtr != bufEnd)
{
switch(*bufPtr)
{
case 'n': // newmtl
{
// if there's an existing material, store it first
if ( currMaterial )
Materials.push_back( currMaterial );
// extract new material's name
c8 mtlNameBuf[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(mtlNameBuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
currMaterial = new SObjMtl;
currMaterial->Name = mtlNameBuf;
}
break;
case 'i': // illum - illumination
if ( currMaterial )
{
const u32 COLOR_BUFFER_LENGTH = 16;
c8 illumStr[COLOR_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(illumStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
currMaterial->Illumination = (c8)atol(illumStr);
}
break;
case 'N':
if ( currMaterial )
{
switch(bufPtr[1])
{
case 's': // Ns - shininess
{
const u32 COLOR_BUFFER_LENGTH = 16;
c8 nsStr[COLOR_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(nsStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
f32 shininessValue = core::fast_atof(nsStr);
// wavefront shininess is from [0, 1000], so scale for OpenGL
shininessValue *= 0.128f;
currMaterial->Meshbuffer->Material.Shininess = shininessValue;
}
break;
case 'i': // Ni - refraction index
{
c8 tmpbuf[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(tmpbuf, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
}
break;
}
}
break;
case 'K':
if ( currMaterial )
{
switch(bufPtr[1])
{
case 'd': // Kd = diffuse
{
bufPtr = readColor(bufPtr, currMaterial->Meshbuffer->Material.DiffuseColor, bufEnd);
}
break;
case 's': // Ks = specular
{
bufPtr = readColor(bufPtr, currMaterial->Meshbuffer->Material.SpecularColor, bufEnd);
}
break;
case 'a': // Ka = ambience
{
bufPtr=readColor(bufPtr, currMaterial->Meshbuffer->Material.AmbientColor, bufEnd);
}
break;
case 'e': // Ke = emissive
{
currMaterial->Meshbuffer->Material.EmissiveColor.setAlpha(255);
bufPtr=readColor(bufPtr, currMaterial->Meshbuffer->Material.EmissiveColor, bufEnd);
}
break;
} // end switch(bufPtr[1])
} // end case 'K': if ( 0 != currMaterial )...
break;
case 'b': // bump
case 'm': // texture maps
if (currMaterial)
{
bufPtr=readTextures(bufPtr, bufEnd, currMaterial, relPath);
}
break;
case 'd': // d - transparency
if ( currMaterial )
{
const u32 COLOR_BUFFER_LENGTH = 16;
c8 dStr[COLOR_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(dStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
f32 dValue = core::fast_atof(dStr);
currMaterial->Meshbuffer->Material.DiffuseColor.setAlpha( (s32)(dValue * 255) );
if (dValue<1.0f)
currMaterial->Meshbuffer->Material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
}
break;
case 'T':
if ( currMaterial )
{
switch ( bufPtr[1] )
{
case 'f': // Tf - Transmitivity
const u32 COLOR_BUFFER_LENGTH = 16;
c8 redStr[COLOR_BUFFER_LENGTH];
c8 greenStr[COLOR_BUFFER_LENGTH];
c8 blueStr[COLOR_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(redStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
bufPtr = goAndCopyNextWord(greenStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
bufPtr = goAndCopyNextWord(blueStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
f32 transparency = ( core::fast_atof(redStr) + core::fast_atof(greenStr) + core::fast_atof(blueStr) ) / 3;
currMaterial->Meshbuffer->Material.DiffuseColor.setAlpha( (s32)(transparency * 255) );
if (transparency < 1.0f)
currMaterial->Meshbuffer->Material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
}
}
break;
default: // comments or not recognised
break;
} // end switch(bufPtr[0])
// go to next line
bufPtr = goNextLine(bufPtr, bufEnd);
} // end while (bufPtr)
// end of file. if there's an existing material, store it
if ( currMaterial )
Materials.push_back( currMaterial );
delete [] buf;
mtlReader->drop();
}
//! Read RGB color
const c8* COBJMeshFileLoader::readColor(const c8* bufPtr, video::SColor& color, const c8* const bufEnd)
{
const u32 COLOR_BUFFER_LENGTH = 16;
c8 colStr[COLOR_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(colStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
color.setRed((u32)core::round32(core::fast_atof(colStr)*255.f));
bufPtr = goAndCopyNextWord(colStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
color.setGreen((u32)core::round32(core::fast_atof(colStr)*255.f));
bufPtr = goAndCopyNextWord(colStr, bufPtr, COLOR_BUFFER_LENGTH, bufEnd);
color.setBlue((u32)core::round32(core::fast_atof(colStr)*255.f));
return bufPtr;
}
//! Read 3d vector of floats
const c8* COBJMeshFileLoader::readVec3(const c8* bufPtr, core::vector3df& vec, const c8* const bufEnd)
{
const u32 WORD_BUFFER_LENGTH = 256;
c8 wordBuffer[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(wordBuffer, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
vec.X=-core::fast_atof(wordBuffer); // change handedness
bufPtr = goAndCopyNextWord(wordBuffer, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
vec.Y=core::fast_atof(wordBuffer);
bufPtr = goAndCopyNextWord(wordBuffer, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
vec.Z=core::fast_atof(wordBuffer);
return bufPtr;
}
//! Read 2d vector of floats
const c8* COBJMeshFileLoader::readUV(const c8* bufPtr, core::vector2df& vec, const c8* const bufEnd)
{
const u32 WORD_BUFFER_LENGTH = 256;
c8 wordBuffer[WORD_BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(wordBuffer, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
vec.X=core::fast_atof(wordBuffer);
bufPtr = goAndCopyNextWord(wordBuffer, bufPtr, WORD_BUFFER_LENGTH, bufEnd);
vec.Y=1-core::fast_atof(wordBuffer); // change handedness
return bufPtr;
}
//! Read boolean value represented as 'on' or 'off'
const c8* COBJMeshFileLoader::readBool(const c8* bufPtr, bool& tf, const c8* const bufEnd)
{
const u32 BUFFER_LENGTH = 8;
c8 tfStr[BUFFER_LENGTH];
bufPtr = goAndCopyNextWord(tfStr, bufPtr, BUFFER_LENGTH, bufEnd);
tf = strcmp(tfStr, "off") != 0;
return bufPtr;
}
COBJMeshFileLoader::SObjMtl* COBJMeshFileLoader::findMtl(const core::stringc& mtlName, const core::stringc& grpName)
{
COBJMeshFileLoader::SObjMtl* defMaterial = 0;
// search existing Materials for best match
// exact match does return immediately, only name match means a new group
for (u32 i = 0; i < Materials.size(); ++i)
{
if ( Materials[i]->Name == mtlName )
{
if ( Materials[i]->Group == grpName )
return Materials[i];
else
defMaterial = Materials[i];
}
}
// we found a partial match
if (defMaterial)
{
Materials.push_back(new SObjMtl(*defMaterial));
Materials.getLast()->Group = grpName;
return Materials.getLast();
}
// we found a new group for a non-existant material
else if (grpName.size())
{
Materials.push_back(new SObjMtl(*Materials[0]));
Materials.getLast()->Group = grpName;
return Materials.getLast();
}
return 0;
}
//! skip space characters and stop on first non-space
const c8* COBJMeshFileLoader::goFirstWord(const c8* buf, const c8* const bufEnd, bool acrossNewlines)
{
// skip space characters
if (acrossNewlines)
while((buf != bufEnd) && core::isspace(*buf))
++buf;
else
while((buf != bufEnd) && core::isspace(*buf) && (*buf != '\n'))
++buf;
return buf;
}
//! skip current word and stop at beginning of next one
const c8* COBJMeshFileLoader::goNextWord(const c8* buf, const c8* const bufEnd, bool acrossNewlines)
{
// skip current word
while(( buf != bufEnd ) && !core::isspace(*buf))
++buf;
return goFirstWord(buf, bufEnd, acrossNewlines);
}
//! Read until line break is reached and stop at the next non-space character
const c8* COBJMeshFileLoader::goNextLine(const c8* buf, const c8* const bufEnd)
{
// look for newline characters
while(buf != bufEnd)
{
// found it, so leave
if (*buf=='\n' || *buf=='\r')
break;
++buf;
}
return goFirstWord(buf, bufEnd);
}
u32 COBJMeshFileLoader::copyWord(c8* outBuf, const c8* const inBuf, u32 outBufLength, const c8* const bufEnd)
{
if (!outBufLength)
return 0;
if (!inBuf)
{
*outBuf = 0;
return 0;
}
u32 i = 0;
while(inBuf[i])
{
if (core::isspace(inBuf[i]) || &(inBuf[i]) == bufEnd)
break;
++i;
}
u32 length = core::min_(i, outBufLength-1);
for (u32 j=0; j<length; ++j)
outBuf[j] = inBuf[j];
outBuf[length] = 0;
return length;
}
core::stringc COBJMeshFileLoader::copyLine(const c8* inBuf, const c8* bufEnd)
{
if (!inBuf)
return core::stringc();
const c8* ptr = inBuf;
while (ptr<bufEnd)
{
if (*ptr=='\n' || *ptr=='\r') // not copying the line end character
break;
++ptr;
}
return core::stringc(inBuf, (u32)(ptr-inBuf));
}
const c8* COBJMeshFileLoader::goAndCopyNextWord(c8* outBuf, const c8* inBuf, u32 outBufLength, const c8* bufEnd)
{
inBuf = goNextWord(inBuf, bufEnd, false);
copyWord(outBuf, inBuf, outBufLength, bufEnd);
return inBuf;
}
bool COBJMeshFileLoader::retrieveVertexIndices(c8* vertexData, s32* idx, const c8* bufEnd, u32 vbsize, u32 vtsize, u32 vnsize)
{
c8 word[16] = "";
const c8* p = goFirstWord(vertexData, bufEnd);
u32 idxType = 0; // 0 = posIdx, 1 = texcoordIdx, 2 = normalIdx
u32 i = 0;
while ( p != bufEnd )
{
if ( ( core::isdigit(*p)) || (*p == '-') )
{
// build up the number
word[i++] = *p;
}
else if ( *p == '/' || *p == ' ' || *p == '\0' )
{
// number is completed. Convert and store it
word[i] = '\0';
// if no number was found index will become 0 and later on -1 by decrement
idx[idxType] = core::strtol10(word);
if (idx[idxType]<0)
{
switch (idxType)
{
case 0:
idx[idxType] += vbsize;
break;
case 1:
idx[idxType] += vtsize;
break;
case 2:
idx[idxType] += vnsize;
break;
}
}
else
idx[idxType]-=1;
// reset the word
word[0] = '\0';
i = 0;
// go to the next kind of index type
if (*p == '/')
{
if ( ++idxType > 2 )
{
// error checking, shouldn't reach here unless file is wrong
idxType = 0;
}
}
else
{
// set all missing values to disable (=-1)
while (++idxType < 3)
idx[idxType]=-1;
++p;
break; // while
}
}
// go to the next char
++p;
}
return true;
}
void COBJMeshFileLoader::cleanUp()
{
for (u32 i=0; i < Materials.size(); ++i )
{
Materials[i]->Meshbuffer->drop();
delete Materials[i];
}
Materials.clear();
}
} // end namespace scene
} // end namespace irr
#endif // _IRR_COMPILE_WITH_OBJ_LOADER_
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