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#include "Model.hpp"
#include <algorithm>
#include <assimp/Importer.hpp>
#include <assimp/postprocess.h>
#include <assimp/scene.h>
#include <cctype>
#include <cfloat>
#include <filesystem>
#include <glm/glm.hpp>
#include <iostream>
namespace renderer
{
Model::Model() {}
static glm::vec3 vecMin( const glm::vec3 &a, const glm::vec3 &b )
{
return glm::vec3( std::min( a.x, b.x ), std::min( a.y, b.y ), std::min( a.z, b.z ) );
}
static glm::vec3 vecMax( const glm::vec3 &a, const glm::vec3 &b )
{
return glm::vec3( std::max( a.x, b.x ), std::max( a.y, b.y ), std::max( a.z, b.z ) );
}
bool Model::loadFromFile( const std::string &path )
{
Assimp::Importer importer;
const aiScene *scene =
importer.ReadFile( path, aiProcess_Triangulate | aiProcess_GenNormals | aiProcess_ImproveCacheLocality |
aiProcess_JoinIdenticalVertices );
if ( !scene || !scene->mRootNode )
{
std::cerr << "Failed to load model: " << path << " (" << importer.GetErrorString() << ")" << std::endl;
return false;
}
std::filesystem::path p( path );
std::string baseDir = p.parent_path().string();
mMeshes.clear();
mTextures.clear();
mNormalTextures.clear();
mMeshToTex.clear();
mMeshToNormal.clear();
mFallbackAlbedoIndex = -1;
mFallbackNormalIndex = -1;
mBoundsMin = glm::vec3( FLT_MAX );
mBoundsMax = glm::vec3( -FLT_MAX );
if ( std::filesystem::exists( baseDir ) && std::filesystem::is_directory( baseDir ) )
{
for ( const auto &e : std::filesystem::directory_iterator( baseDir ) )
{
if ( !e.is_regular_file() )
continue;
auto ext = e.path().extension().string();
std::string extLower = ext;
std::transform( extLower.begin(), extLower.end(), extLower.begin(),
[]( unsigned char c ) { return std::tolower( c ); } );
if ( extLower != ".png" && extLower != ".jpg" && extLower != ".jpeg" && extLower != ".tga" )
continue;
std::string fname = e.path().filename().string();
std::string fnameLower = fname;
std::transform( fnameLower.begin(), fnameLower.end(), fnameLower.begin(),
[]( unsigned char c ) { return std::tolower( c ); } );
if ( fnameLower.find( "base" ) != std::string::npos ||
fnameLower.find( "albedo" ) != std::string::npos ||
fnameLower.find( "diff" ) != std::string::npos )
{
Texture t;
if ( t.loadFromFile( e.path().string() ) )
{
mFallbackAlbedoIndex = static_cast< int >( mTextures.size() );
mTextures.push_back( std::move( t ) );
std::cerr << "Model: found fallback albedo: " << e.path().string() << " (index "
<< mFallbackAlbedoIndex << ")\n";
}
}
else if ( fnameLower.find( "normal" ) != std::string::npos ||
fnameLower.find( "nrm" ) != std::string::npos ||
fnameLower.find( "bump" ) != std::string::npos )
{
Texture tn;
if ( tn.loadFromFile( e.path().string() ) )
{
mFallbackNormalIndex = static_cast< int >( mNormalTextures.size() );
mNormalTextures.push_back( std::move( tn ) );
std::cerr << "Model: found fallback normal: " << e.path().string() << " (index "
<< mFallbackNormalIndex << ")\n";
}
}
}
}
return processNode( scene->mRootNode, scene, baseDir );
}
bool Model::processNode( aiNode *node, const aiScene *scene, const std::string &baseDir )
{
for ( unsigned int i = 0; i < node->mNumMeshes; ++i )
{
aiMesh *mesh = scene->mMeshes[node->mMeshes[i]];
int texIndex = -1;
int normalIndex = -1;
if ( !processMesh( mesh, scene, baseDir, texIndex, normalIndex ) )
return false;
if ( texIndex == -1 && mFallbackAlbedoIndex != -1 )
texIndex = mFallbackAlbedoIndex;
if ( normalIndex == -1 && mFallbackNormalIndex != -1 )
normalIndex = mFallbackNormalIndex;
mMeshToTex.push_back( texIndex );
mMeshToNormal.push_back( normalIndex );
std::cerr << "Model: mesh " << i << " -> albedo index " << texIndex << ", normal index " << normalIndex
<< "\n";
}
for ( unsigned int i = 0; i < node->mNumChildren; ++i )
{
if ( !processNode( node->mChildren[i], scene, baseDir ) )
return false;
}
return true;
}
bool Model::processMesh( aiMesh *mesh, const aiScene *scene, const std::string &baseDir, int &outTexIndex,
int &outNormalIndex )
{
std::vector< float > data;
data.reserve( mesh->mNumFaces * 3 * 8 );
glm::vec3 localMin( FLT_MAX );
glm::vec3 localMax( -FLT_MAX );
for ( unsigned int f = 0; f < mesh->mNumFaces; ++f )
{
aiFace &face = mesh->mFaces[f];
for ( unsigned int vi = 0; vi < face.mNumIndices; ++vi )
{
unsigned int idx = face.mIndices[vi];
aiVector3D pos = mesh->mVertices[idx];
aiVector3D normal = mesh->HasNormals() ? mesh->mNormals[idx] : aiVector3D( 0.0f, 1.0f, 0.0f );
aiVector3D texcoord =
mesh->HasTextureCoords( 0 ) ? mesh->mTextureCoords[0][idx] : aiVector3D( 0.0f, 0.0f, 0.0f );
data.push_back( pos.x );
data.push_back( pos.y );
data.push_back( pos.z );
data.push_back( texcoord.x );
data.push_back( texcoord.y );
data.push_back( normal.x );
data.push_back( normal.y );
data.push_back( normal.z );
}
}
for ( size_t i = 0; i + 7 < data.size(); i += 8 )
{
glm::vec3 p( data[i + 0], data[i + 1], data[i + 2] );
localMin = vecMin( localMin, p );
localMax = vecMax( localMax, p );
}
if ( localMin.x <= localMax.x )
{
mBoundsMin = vecMin( mBoundsMin, localMin );
mBoundsMax = vecMax( mBoundsMax, localMax );
}
auto m = std::make_unique< Mesh >();
if ( !m->createFromPosTexNormal( data ) )
{
std::cerr << "Failed to create mesh for model" << std::endl;
return false;
}
mMeshes.push_back( std::move( m ) );
outTexIndex = -1;
outNormalIndex = -1;
if ( mesh->mMaterialIndex >= 0 && scene->mMaterials && mesh->mMaterialIndex < scene->mNumMaterials )
{
aiMaterial *mat = scene->mMaterials[mesh->mMaterialIndex];
aiString texPath;
if ( AI_SUCCESS == mat->GetTexture( aiTextureType_DIFFUSE, 0, &texPath ) )
{
std::string texStr = texPath.C_Str();
std::filesystem::path full = std::filesystem::path( baseDir ) / texStr;
Texture t;
if ( t.loadFromFile( full.string() ) )
{
outTexIndex = static_cast< int >( mTextures.size() );
mTextures.push_back( std::move( t ) );
}
else
{
std::cerr << "Warning: failed to load texture: " << full.string() << std::endl;
}
}
if ( AI_SUCCESS == mat->GetTexture( aiTextureType_NORMALS, 0, &texPath ) ||
AI_SUCCESS == mat->GetTexture( aiTextureType_HEIGHT, 0, &texPath ) )
{
std::string texStrN = texPath.C_Str();
std::filesystem::path fullN = std::filesystem::path( baseDir ) / texStrN;
Texture tn;
if ( tn.loadFromFile( fullN.string() ) )
{
outNormalIndex = static_cast< int >( mNormalTextures.size() );
mNormalTextures.push_back( std::move( tn ) );
}
else
{
std::cerr << "Warning: failed to load normal map: " << fullN.string() << std::endl;
}
}
}
return true;
}
} // namespace renderer
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