153 lines
4.9 KiB
C++
153 lines
4.9 KiB
C++
/*******************************************************************************
|
|
Copyright (c) 2005-2009 David Williams
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
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
|
|
distribution.
|
|
*******************************************************************************/
|
|
|
|
#include "PolyVoxExample.h"
|
|
#include "Perlin.h"
|
|
|
|
#include "PolyVox/MaterialDensityPair.h"
|
|
#include "PolyVox/CubicSurfaceExtractor.h"
|
|
#include "PolyVox/MarchingCubesSurfaceExtractor.h"
|
|
#include "PolyVox/Mesh.h"
|
|
#include "PolyVox/PagedVolume.h"
|
|
|
|
#include <QApplication>
|
|
|
|
// Use the PolyVox namespace
|
|
using namespace PolyVox;
|
|
|
|
/**
|
|
* Generates data using Perlin noise.
|
|
*/
|
|
class PerlinNoisePager : public PolyVox::PagedVolume<MaterialDensityPair44>::Pager
|
|
{
|
|
public:
|
|
/// Constructor
|
|
PerlinNoisePager()
|
|
:PagedVolume<MaterialDensityPair44>::Pager()
|
|
{
|
|
}
|
|
|
|
/// Destructor
|
|
virtual ~PerlinNoisePager() {};
|
|
|
|
virtual void pageIn(const PolyVox::Region& region, PagedVolume<MaterialDensityPair44>::Chunk* pChunk)
|
|
{
|
|
Perlin perlin(2,2,1,234);
|
|
|
|
for(int x = region.getLowerX(); x <= region.getUpperX(); x++)
|
|
{
|
|
for(int y = region.getLowerY(); y <= region.getUpperY(); y++)
|
|
{
|
|
float perlinVal = perlin.Get(x / static_cast<float>(255-1), y / static_cast<float>(255-1));
|
|
perlinVal += 1.0f;
|
|
perlinVal *= 0.5f;
|
|
perlinVal *= 255;
|
|
for(int z = region.getLowerZ(); z <= region.getUpperZ(); z++)
|
|
{
|
|
MaterialDensityPair44 voxel;
|
|
if(z < perlinVal)
|
|
{
|
|
const int xpos = 50;
|
|
const int zpos = 100;
|
|
if((x-xpos)*(x-xpos) + (z-zpos)*(z-zpos) < 200)
|
|
{
|
|
// tunnel
|
|
voxel.setMaterial(0);
|
|
voxel.setDensity(MaterialDensityPair44::getMinDensity());
|
|
} else
|
|
{
|
|
// solid
|
|
voxel.setMaterial(245);
|
|
voxel.setDensity(MaterialDensityPair44::getMaxDensity());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
voxel.setMaterial(0);
|
|
voxel.setDensity(MaterialDensityPair44::getMinDensity());
|
|
}
|
|
|
|
// Voxel position within a chunk always start from zero. So if a chunk represents region (4, 8, 12) to (11, 19, 15)
|
|
// then the valid chunk voxels are from (0, 0, 0) to (7, 11, 3). Hence we subtract the lower corner position of the
|
|
// region from the volume space position in order to get the chunk space position.
|
|
pChunk->setVoxel(x - region.getLowerX(), y - region.getLowerY(), z - region.getLowerZ(), voxel);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
virtual void pageOut(const PolyVox::Region& region, PagedVolume<MaterialDensityPair44>::Chunk* /*pChunk*/)
|
|
{
|
|
std::cout << "warning unloading region: " << region.getLowerCorner() << " -> " << region.getUpperCorner() << std::endl;
|
|
}
|
|
};
|
|
|
|
class PagingExample : public PolyVoxExample
|
|
{
|
|
public:
|
|
PagingExample(QWidget *parent)
|
|
:PolyVoxExample(parent)
|
|
{
|
|
}
|
|
|
|
protected:
|
|
void initializeExample() override
|
|
{
|
|
PerlinNoisePager* pager = new PerlinNoisePager();
|
|
PagedVolume<MaterialDensityPair44> volData(pager, 8 * 1024 * 1024, 64);
|
|
|
|
// Just some tests of memory usage, etc.
|
|
std::cout << "Memory usage: " << (volData.calculateSizeInBytes() / 1024.0 / 1024.0) << "MB" << std::endl;
|
|
PolyVox::Region reg(Vector3DInt32(-255, 0, 0), Vector3DInt32(255, 255, 255));
|
|
std::cout << "Prefetching region: " << reg.getLowerCorner() << " -> " << reg.getUpperCorner() << std::endl;
|
|
volData.prefetch(reg);
|
|
std::cout << "Memory usage: " << (volData.calculateSizeInBytes() / 1024.0 / 1024.0) << "MB" << std::endl;
|
|
std::cout << "Flushing entire volume" << std::endl;
|
|
volData.flushAll();
|
|
std::cout << "Memory usage: " << (volData.calculateSizeInBytes() / 1024.0 / 1024.0) << "MB" << std::endl;
|
|
|
|
// Extract the surface
|
|
PolyVox::Region reg2(Vector3DInt32(0, 0, 0), Vector3DInt32(254, 254, 254));
|
|
auto mesh = extractCubicMesh(&volData, reg2);
|
|
std::cout << "#vertices: " << mesh.getNoOfVertices() << std::endl;
|
|
|
|
auto decodedMesh = decodeMesh(mesh);
|
|
|
|
// Pass the surface to the OpenGL window
|
|
addMesh(decodedMesh);
|
|
|
|
setCameraTransform(QVector3D(300.0f, 300.0f, 300.0f), -(PI / 4.0f), PI + (PI / 4.0f));
|
|
}
|
|
};
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
// Create and show the Qt OpenGL window
|
|
QApplication app(argc, argv);
|
|
PagingExample openGLWidget(0);
|
|
openGLWidget.show();
|
|
|
|
// Run the message pump.
|
|
return app.exec();
|
|
}
|