Submesh*
CmodLoader::loadSubmesh()
{
VertexSpec* vertexSpec = loadVertexSpec();
if (!vertexSpec)
{
return NULL;
}
VertexArray* vertexArray = loadVertexArray(*vertexSpec);
if (!vertexArray)
{
delete vertexSpec;
return NULL;
}
Submesh* submesh = new Submesh(vertexArray);
bool done = false;
while (!done && !error())
{
quint16 token = 0;
*m_inputStream >> token;
if (token == CmodEndMesh)
{
done = true;
}
else
{
unsigned int materialIndex = 0;
PrimitiveBatch* primitives = loadPrimitiveBatch(token, vertexArray->count(), &materialIndex);
if (primitives)
{
submesh->addPrimitiveBatch(primitives, materialIndex);
}
}
}
if (error())
{
delete submesh;
submesh = NULL;
}
return submesh;
}
/** Merge a list of submeshes to create a single submesh. All submeshes must share
* the same vertex spec. There must be at least one submesh in the list to merge.
*
* \return the new submesh, or null if there was an error creating the submesh.
*/
Submesh*
Submesh::mergeSubmeshes(const std::vector<Submesh*>& submeshes)
{
if (submeshes.empty())
{
return NULL;
}
const VertexSpec& vertexSpec = submeshes.front()->vertices()->vertexSpec();
const unsigned int vertexStride = submeshes.front()->vertices()->stride();
// Verify that the strides and vertex specs of all submeshes match
unsigned int vertexCount = 0;
for (vector<Submesh*>::const_iterator iter = submeshes.begin(); iter != submeshes.end(); ++iter)
{
Submesh* s = *iter;
if (s->vertices()->vertexSpec() != vertexSpec || s->vertices()->stride() != vertexStride)
{
VESTA_WARNING("MergeSubmeshes attempted on incompatible submeshes.");
return false;
}
vertexCount += s->vertices()->count();
}
// Create a new vertex array large enough to contain all of the submeshes
unsigned int vertexDataSize = vertexCount * vertexStride;
Submesh* submesh = NULL;
char* vertexData = NULL;
VertexArray* vertexArray = NULL;
try
{
vertexData = new char[vertexDataSize];
vertexArray = new VertexArray(vertexData, vertexCount, vertexSpec, vertexStride);
submesh = new Submesh(vertexArray);
}
catch (bad_alloc&)
{
VESTA_WARNING("Out of memory during submesh merge.");
if (vertexArray)
{
// Deleting the vertex array takes care of the vertexData too
delete vertexArray;
}
else if (vertexData)
{
delete[] vertexData;
}
return NULL;
}
unsigned int vertexDataOffset = 0;
// Copy vertices from the submeshes in the merge list to the new vertex array
for (vector<Submesh*>::const_iterator iter = submeshes.begin(); iter != submeshes.end(); ++iter)
{
Submesh* s = *iter;
unsigned int submeshVertexDataSize = vertexStride * s->vertices()->count();
assert(vertexDataOffset + submeshVertexDataSize <= vertexDataSize);
copy(reinterpret_cast<const char*>(s->vertices()->data()),
reinterpret_cast<const char*>(s->vertices()->data()) + submeshVertexDataSize,
vertexData + vertexDataOffset);
vertexDataOffset += submeshVertexDataSize;
}
// Copy materials and primitive batches from submeshes in the merge list
try
{
unsigned int vertexOffset = 0;
for (vector<Submesh*>::const_iterator iter = submeshes.begin(); iter != submeshes.end() && submesh != NULL; ++iter)
{
Submesh* s = *iter;
assert(s->materials().size() == s->primitiveBatches().size());
for (unsigned int i = 0; i < s->primitiveBatchCount(); ++i)
{
const PrimitiveBatch* prims = s->primitiveBatches().at(i);
PrimitiveBatch* newPrims = new PrimitiveBatch(*prims);
if (vertexOffset != 0)
{
if (!newPrims->offsetIndices(vertexOffset))
{
delete submesh;
submesh = NULL;
break;
}
}
submesh->addPrimitiveBatch(newPrims, s->materials().at(i));
}
vertexOffset += s->vertices()->count();
}
}
catch (bad_alloc&)
{
VESTA_WARNING("Out of memory during submesh merge.");
delete submesh;
submesh = NULL;
}
return submesh;
}
static MeshGeometry*
Convert3DSMesh(Lib3dsFile* meshfile, TextureMapLoader* textureLoader)
{
MeshGeometry* meshGeometry = new MeshGeometry();
for (int materialIndex = 0; materialIndex < meshfile->nmaterials; ++materialIndex)
{
Lib3dsMaterial* material = meshfile->materials[materialIndex];
Material* vmaterial = new Material();
// Convert a 3ds material to VESTA material
vmaterial->setOpacity(1.0f - material->transparency);
vmaterial->setDiffuse(Spectrum(material->diffuse));
if (material->shininess != 0.0f)
{
vmaterial->setSpecular(Spectrum(material->specular));
vmaterial->setPhongExponent(std::pow(2.0f, 1.0f + 10.0f * material->shininess));
}
if (material->self_illum_flag)
{
vmaterial->setEmission(vmaterial->diffuse() * material->self_illum);
}
const string baseTextureName(material->texture1_map.name);
if (!baseTextureName.empty())
{
TextureProperties texProperties;
if ((material->texture1_map.flags & LIB3DS_TEXTURE_NO_TILE) != 0)
{
texProperties.addressS = TextureProperties::Clamp;
texProperties.addressT = TextureProperties::Clamp;
}
if (textureLoader)
{
TextureMap* baseTexture = textureLoader->loadTexture(baseTextureName, texProperties);
vmaterial->setBaseTexture(baseTexture);
}
}
meshGeometry->addMaterial(vmaterial);
}
for (int meshIndex = 0; meshIndex < meshfile->nmeshes; ++meshIndex)
{
Lib3dsMesh* mesh = meshfile->meshes[meshIndex];
if (mesh->nfaces > 0)
{
bool hasTextureCoords = mesh->texcos != 0;
// Generate normals for the mesh
float* normals = new float[mesh->nfaces * 9];
lib3ds_mesh_calculate_vertex_normals(mesh, (float(*)[3]) normals);
VertexPool vertexPool;
for (int faceIndex = 0; faceIndex < mesh->nfaces; ++faceIndex)
{
for (int i = 0; i < 3; i++)
{
int vertexIndex = mesh->faces[faceIndex].index[i];
vertexPool.addVec3(mesh->vertices[vertexIndex]);
vertexPool.addVec3(&normals[(faceIndex * 3 + i) * 3]);
if (hasTextureCoords)
{
// Invert the v texture coordinate, since 3ds uses a texture
// coordinate system that is flipped with respect to OpenGL's
vertexPool.addVec2(mesh->texcos[vertexIndex][0], 1.0f - mesh->texcos[vertexIndex][1]);
}
}
}
delete[] normals;
const VertexSpec* vertexSpec = hasTextureCoords ? &VertexSpec::PositionNormalTex : &VertexSpec::PositionNormal;
VertexArray* vertexArray = vertexPool.createVertexArray(mesh->nfaces * 3, *vertexSpec);
PrimitiveBatch* batch = new PrimitiveBatch(PrimitiveBatch::Triangles, mesh->nfaces);
// Get the material for the primitive batch
// TODO: This assumes that a single material is applied to the whole mesh; however,
// materials can be assigned per-face (but rarely are in most 3ds files.)
unsigned int materialIndex = Submesh::DefaultMaterialIndex;
if (mesh->nfaces > 0)
{
// Use the material of the first face
materialIndex = mesh->faces[0].material;
}
Submesh* submesh = new Submesh(vertexArray);
submesh->addPrimitiveBatch(batch, materialIndex);
meshGeometry->addSubmesh(submesh);
}
}
return meshGeometry;
}
