polyvox/tests/TestSurfaceExtractor.cpp

/*******************************************************************************
Copyright (c) 2010 Matt Williams

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warranty. In no event will the authors be held liable for any damages
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Permission is granted to anyone to use this software for any purpose,
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    appreciated but is not required.

    2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.

    3. This notice may not be removed or altered from any source
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*******************************************************************************/

#include "TestSurfaceExtractor.h"

#include "PolyVoxCore/Density.h"
#include "PolyVoxCore/MaterialDensityPair.h"
#include "PolyVoxCore/SimpleVolume.h"
#include "PolyVoxCore/SurfaceExtractor.h"

#include <QtTest>

using namespace PolyVox;


// These 'writeDensityValueToVoxel' functions provide a unified interface for writting densities to primative and class voxel types.
// They are conceptually the inverse of the 'convertToDensity' function used by the SurfaceExtractor. They probably shouldn't be part
// of PolyVox, but they might be usful to other tests so we cold move them into a 'Tests.h' or something in the future.
template<typename VoxelType>
void writeDensityValueToVoxel(int valueToWrite, VoxelType& voxel)
{
	voxel = valueToWrite;
}

template<>
void writeDensityValueToVoxel(int valueToWrite, Density8& voxel)
{
	voxel.setDensity(valueToWrite);
}

template<>
void writeDensityValueToVoxel(int valueToWrite, MaterialDensityPair88& voxel)
{
	voxel.setDensity(valueToWrite);
}

template<typename VoxelType>
void writeMaterialValueToVoxel(int valueToWrite, VoxelType& voxel)
{
	//Most types don't have a material
	return;
}

template<>
void writeMaterialValueToVoxel(int valueToWrite, MaterialDensityPair88& voxel)
{
	voxel.setMaterial(valueToWrite);
}

// Runs the surface extractor for a given type. 
template <typename VoxelType>
void testForType(SurfaceMesh<PositionMaterialNormal>& result)
{
	const int32_t uVolumeSideLength = 32;

	//Create empty volume
	SimpleVolume<VoxelType> volData(Region(Vector3DInt32(0,0,0), Vector3DInt32(uVolumeSideLength-1, uVolumeSideLength-1, uVolumeSideLength-1)));

	for (int32_t z = 0; z < uVolumeSideLength; z++)
	{
		for (int32_t y = 0; y < uVolumeSideLength; y++)
		{
			for (int32_t x = 0; x < uVolumeSideLength; x++)
			{
				VoxelType voxelValue;
				//Create a density field which changes throughout the volume.
				writeDensityValueToVoxel<VoxelType>(x + y + z, voxelValue);
				//Two different materials in two halves of the volume
				writeMaterialValueToVoxel<VoxelType>(z > uVolumeSideLength / 2 ? 42 : 79, voxelValue);
				volData.setVoxelAt(x, y, z, voxelValue);
			}
		}
	}

	// THIS TEST IS BROKEN BECAUSE CUSTOM THRESHOLDS ARE TEMOPRARILY NOT WORKING.
	SurfaceExtractor< SimpleVolume<VoxelType> > extractor(&volData, volData.getEnclosingRegion(), &result/*, 50*/);
	extractor.execute();
}

void TestSurfaceExtractor::testExecute()
{
	const static uint32_t uExpectedVertices = 4731;
	const static uint32_t uExpectedIndices = 12810;
	const static uint32_t uMaterialToCheck = 3000;
	const static float fExpectedMaterial = 42.0f;
	const static float fNoMaterial = 1.0f;

	SurfaceMesh<PositionMaterialNormal> mesh;

	testForType<int8_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<uint8_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<int16_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<uint16_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<int32_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<uint32_t>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<float>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<double>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<Density8>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);

	testForType<MaterialDensityPair88>(mesh);
	QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
	QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
	QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fExpectedMaterial);
}

QTEST_MAIN(TestSurfaceExtractor)