shared_ptr<GLTF::GLTFPrimitiveRemapInfos> __BuildPrimitiveUniqueIndexes(shared_ptr<GLTF::GLTFPrimitive> primitive,
std::vector< shared_ptr<GLTF::GLTFIndices> > allIndices,
RemappedMeshIndexesHashmap& remappedMeshIndexesMap,
unsigned int* indicesInRemapping,
size_t startIndex,
unsigned int meshAttributesCount,
size_t &endIndex)
{
unsigned int generatedIndicesCount = 0;
size_t allIndicesSize = allIndices.size();
size_t vertexIndicesCount = allIndices[0]->getCount();
size_t sizeOfRemappedIndex = (meshAttributesCount + 1) * sizeof(unsigned int);
unsigned int* originalCountAndIndexes = (unsigned int*)calloc( vertexIndicesCount, sizeOfRemappedIndex);
//this is useful for debugging.
unsigned int *uniqueIndexes = (unsigned int*)calloc( vertexIndicesCount , sizeof(unsigned int));
unsigned int *generatedIndices = (unsigned int*) calloc (vertexIndicesCount , sizeof(unsigned int)); //owned by PrimitiveRemapInfos
unsigned int currentIndex = startIndex;
for (size_t k = 0 ; k < vertexIndicesCount ; k++) {
unsigned int* remappedIndex = &originalCountAndIndexes[k * (meshAttributesCount + 1)];
remappedIndex[0] = meshAttributesCount;
for (unsigned int i = 0 ; i < allIndicesSize ; i++) {
unsigned int idx = indicesInRemapping[i];
unsigned int* indicesPtr = (unsigned int*)allIndices[i]->getBufferView()->getBufferDataByApplyingOffset();
remappedIndex[1 + idx] = indicesPtr[k];
}
unsigned int index;
if (remappedMeshIndexesMap.count(remappedIndex) == 0) {
index = currentIndex++;
generatedIndices[generatedIndicesCount++] = (unsigned int)k;
remappedMeshIndexesMap[remappedIndex] = index;
} else {
index = remappedMeshIndexesMap[remappedIndex];
}
uniqueIndexes[k] = index;
}
endIndex = currentIndex;
shared_ptr <GLTF::GLTFPrimitiveRemapInfos> primitiveRemapInfos(new GLTF::GLTFPrimitiveRemapInfos(generatedIndices, generatedIndicesCount, originalCountAndIndexes));
shared_ptr <GLTF::GLTFBufferView> indicesBufferView = createBufferViewWithAllocatedBuffer(uniqueIndexes, 0, vertexIndicesCount * sizeof(unsigned int), true);
shared_ptr <GLTF::GLTFIndices> indices = shared_ptr <GLTF::GLTFIndices> (new GLTF::GLTFIndices(indicesBufferView, vertexIndicesCount));
primitive->setIndices(indices);
return primitiveRemapInfos;
}
shared_ptr<JSONExport::JSONPrimitiveRemapInfos> JSONPrimitive::buildUniqueIndexes(RemappedMeshIndexesHashmap& remappedMeshIndexesMap, unsigned int startIndex, unsigned int &endIndex)
{
//get indices[0] presumably the VERTEX
size_t indicesCount = this->indicesCount();
//we reserve vertexCount * slices of [_allIndices.size() + 1] (for count)
unsigned int generatedIndicesCount = 0;
unsigned int vertexAttributesCount = _allIndices.size();
size_t sizeOfRemappedIndex = (vertexAttributesCount + 1) * sizeof(unsigned int);
this->_originalCountAndIndexes = (unsigned int*)malloc( indicesCount * sizeOfRemappedIndex);
unsigned int *uniqueIndexes = (unsigned int*)malloc( indicesCount * sizeof(unsigned int));
unsigned int* generatedIndices = (unsigned int*) malloc (indicesCount * sizeof(unsigned int)); //owned by PrimitiveRemapInfos
unsigned int currentIndex = startIndex;
for (int k = 0 ; k < indicesCount ; k++) {
unsigned int* remappedIndex = &this->_originalCountAndIndexes[k * (vertexAttributesCount + 1)];
remappedIndex[0] = vertexAttributesCount;
for (int i = 0 ; i < vertexAttributesCount ; i++) {
//FIXME: test indirection in ->getBuffer..
remappedIndex[1 + i] = ((unsigned int*)(static_pointer_cast <JSONDataBuffer> (_allIndices[i]->getBuffer())->getData()))[k];
}
unsigned int index = remappedMeshIndexesMap[remappedIndex];
if (index == 0) {
index = currentIndex++;
generatedIndices[generatedIndicesCount++] = k;
remappedMeshIndexesMap[remappedIndex] = index;
}
uniqueIndexes[k] = index - 1;
}
endIndex = currentIndex;
shared_ptr <JSONExport::JSONPrimitiveRemapInfos> primitiveRemapInfos(new JSONExport::JSONPrimitiveRemapInfos(generatedIndices, generatedIndicesCount));
shared_ptr <JSONExport::JSONDataBuffer> indicesBuffer(new JSONExport::JSONDataBuffer(uniqueIndexes, indicesCount * sizeof(unsigned int), true));
this->_uniqueIndices = shared_ptr <JSONExport::JSONIndices> (new JSONExport::JSONIndices(indicesBuffer, indicesCount, JSONExport::VERTEX, 0));
return primitiveRemapInfos;
}
