caiyu/gmio
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

libstl: add buffered reading of triangle data (binary format)

Browse Source
This commit is contained in:
Hugues Delorme 2012-02-28 20:32:00 +01:00
parent 6f7bfd31e6
commit 98176be41d
1 changed files with 41 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
src/libstl/stlb.cpp
View File

@ -116,6 +116,7 @@ Io::ReadError Io::read(AbstractGeometryBuilder* builder)
AbstractStream* istream = this->stream();
AbstractTaskProgress* progress = this->taskProgress();
// Io::ReadError readErr = Io::NoReadError;
const UInt32 chunkSize = stlTriangleDataSize * 163;
UInt8 buffer[8192];
char* charBuffer = reinterpret_cast<char*>(buffer);
@ -140,40 +141,54 @@ Io::ReadError Io::read(AbstractGeometryBuilder* builder)
}
// Read triangles
const UInt64 totalFacetSize = stlTriangleDataSize * facetCount;
UInt64 amountReadSize = 0;
Triangle triangle;
for (UInt32 facet = 0; facet < facetCount; ++facet) {
istream->read(charBuffer, stlTriangleDataSize);
// if ((readErr = streamRead(istream, charBuffer, stlTriangleDataSize)) != NoReadError)
// return readErr;
bool streamError = false;
while (amountReadSize < totalFacetSize && !streamError) {
const Int64 iReadSize = istream->read(charBuffer, chunkSize);
if (iReadSize > 0 && (iReadSize % stlTriangleDataSize == 0)) {
const UInt32 iFacetCount = iReadSize / stlTriangleDataSize;
UInt32 bufferOffset = 0;
for (UInt32 i = 0; i < iFacetCount; ++i) {
// Read normal
triangle.normal.x = ::fromLittleEndian<Real32>(buffer + bufferOffset);
triangle.normal.y = ::fromLittleEndian<Real32>(buffer + 1*sizeof(Real32) + bufferOffset);
triangle.normal.z = ::fromLittleEndian<Real32>(buffer + 2*sizeof(Real32) + bufferOffset);
// Read normal
triangle.normal.x = ::fromLittleEndian<Real32>(buffer);
triangle.normal.y = ::fromLittleEndian<Real32>(buffer + 1*sizeof(Real32));
triangle.normal.z = ::fromLittleEndian<Real32>(buffer + 2*sizeof(Real32));
// Read vertex1
triangle.v1.x = ::fromLittleEndian<Real32>(buffer + 3*sizeof(Real32) + bufferOffset);
triangle.v1.y = ::fromLittleEndian<Real32>(buffer + 4*sizeof(Real32) + bufferOffset);
triangle.v1.z = ::fromLittleEndian<Real32>(buffer + 5*sizeof(Real32) + bufferOffset);
// Read vertex1
triangle.v1.x = ::fromLittleEndian<Real32>(buffer + 3*sizeof(Real32));
triangle.v1.y = ::fromLittleEndian<Real32>(buffer + 4*sizeof(Real32));
triangle.v1.z = ::fromLittleEndian<Real32>(buffer + 5*sizeof(Real32));
// Read vertex2
triangle.v2.x = ::fromLittleEndian<Real32>(buffer + 6*sizeof(Real32) + bufferOffset);
triangle.v2.y = ::fromLittleEndian<Real32>(buffer + 7*sizeof(Real32) + bufferOffset);
triangle.v2.z = ::fromLittleEndian<Real32>(buffer + 8*sizeof(Real32) + bufferOffset);
// Read vertex2
triangle.v2.x = ::fromLittleEndian<Real32>(buffer + 6*sizeof(Real32));
triangle.v2.y = ::fromLittleEndian<Real32>(buffer + 7*sizeof(Real32));
triangle.v2.z = ::fromLittleEndian<Real32>(buffer + 8*sizeof(Real32));
// Read vertex3
triangle.v3.x = ::fromLittleEndian<Real32>(buffer + 9*sizeof(Real32) + bufferOffset);
triangle.v3.y = ::fromLittleEndian<Real32>(buffer + 10*sizeof(Real32) + bufferOffset);
triangle.v3.z = ::fromLittleEndian<Real32>(buffer + 11*sizeof(Real32) + bufferOffset);
// Read vertex3
triangle.v3.x = ::fromLittleEndian<Real32>(buffer + 9*sizeof(Real32));
triangle.v3.y = ::fromLittleEndian<Real32>(buffer + 10*sizeof(Real32));
triangle.v3.z = ::fromLittleEndian<Real32>(buffer + 11*sizeof(Real32));
// Attribute byte count
const UInt16 attributeByteCount =
::fromLittleEndian<UInt16>(buffer + 12*sizeof(Real32) + bufferOffset);
// Attribute byte count
const UInt16 attributeByteCount = ::fromLittleEndian<UInt16>(buffer + 12*sizeof(Real32));
// Add triangle
builder->nextTriangle(triangle, attributeByteCount);
// Add triangle
builder->nextTriangle(triangle, attributeByteCount);
bufferOffset += stlTriangleDataSize;
}
if (progress != 0)
progress->setValue(facet + 1);
if (progress != 0)
progress->setValue(amountReadSize / stlTriangleDataSize);
amountReadSize += iReadSize;
}
else {
streamError = true;
}
}
builder->endTriangles();