198 lines
7.6 KiB
C++
198 lines
7.6 KiB
C++
/*******************************************************************************
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Copyright (c) 2005-2009 David Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#include "OpenGLWidget.h"
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#include "Perlin.h"
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#include "PolyVoxCore/MaterialDensityPair.h"
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#include "PolyVoxCore/CubicSurfaceExtractor.h"
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#include "PolyVoxCore/MarchingCubesSurfaceExtractor.h"
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#include "PolyVoxCore/Pager.h"
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#include "PolyVoxCore/RLEBlockCompressor.h"
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#include "PolyVoxCore/Mesh.h"
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#include "PolyVoxCore/LargeVolume.h"
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#include <QApplication>
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//Use the PolyVox namespace
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using namespace PolyVox;
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void createSphereInVolume(LargeVolume<MaterialDensityPair44>& volData, Vector3DFloat v3dVolCenter, float fRadius)
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{
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//This vector hold the position of the center of the volume
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//Vector3DFloat v3dVolCenter(volData.getWidth() / 2, volData.getHeight() / 2, volData.getDepth() / 2);
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int iRadius = fRadius;
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//This three-level for loop iterates over every voxel in the volume
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for (int z = v3dVolCenter.getZ() - iRadius; z <= v3dVolCenter.getZ() + iRadius; z++)
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{
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for (int y = v3dVolCenter.getY() - iRadius; y <= v3dVolCenter.getY() + iRadius; y++)
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{
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for (int x = v3dVolCenter.getX() - iRadius; x <= v3dVolCenter.getX() + iRadius; x++)
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{
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//Store our current position as a vector...
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Vector3DFloat v3dCurrentPos(x,y,z);
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//And compute how far the current position is from the center of the volume
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float fDistToCenter = (v3dCurrentPos - v3dVolCenter).length();
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//If the current voxel is less than 'radius' units from the center then we make it solid.
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if(fDistToCenter <= fRadius)
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{
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//Our new density value
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uint8_t uDensity = MaterialDensityPair44::getMaxDensity();
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//Get the old voxel
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MaterialDensityPair44 voxel = volData.getVoxel(x,y,z);
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//Modify the density
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voxel.setDensity(uDensity);
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//Wrte the voxel value into the volume
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volData.setVoxelAt(x, y, z, voxel);
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}
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}
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}
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}
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}
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/**
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* Generates data using Perlin noise.
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*/
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class PerlinNoisePager : public PolyVox::Pager<MaterialDensityPair44>
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{
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public:
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/// Constructor
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PerlinNoisePager()
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:Pager<MaterialDensityPair44>()
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{
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}
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/// Destructor
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virtual ~PerlinNoisePager() {};
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virtual void pageIn(const PolyVox::Region& region, CompressedBlock<MaterialDensityPair44>* pBlockData)
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{
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// FIXME - this isn't a great example... it's a shame we have to hard clode the block size and also create/destroy
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// a compressor each time. These could at least be moved outside somewhere if we can't fix it in a better way...
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UncompressedBlock<MaterialDensityPair44> block(256);
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Perlin perlin(2,2,1,234);
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for(int x = region.getLowerX(); x <= region.getUpperX(); x++)
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{
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for(int y = region.getLowerY(); y <= region.getUpperY(); y++)
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{
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float perlinVal = perlin.Get(x / static_cast<float>(255-1), y / static_cast<float>(255-1));
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perlinVal += 1.0f;
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perlinVal *= 0.5f;
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perlinVal *= 255;
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for(int z = region.getLowerZ(); z <= region.getUpperZ(); z++)
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{
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MaterialDensityPair44 voxel;
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if(z < perlinVal)
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{
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const int xpos = 50;
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const int zpos = 100;
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if((x-xpos)*(x-xpos) + (z-zpos)*(z-zpos) < 200) {
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// tunnel
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voxel.setMaterial(0);
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voxel.setDensity(MaterialDensityPair44::getMinDensity());
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} else {
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// solid
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voxel.setMaterial(245);
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voxel.setDensity(MaterialDensityPair44::getMaxDensity());
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}
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}
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else
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{
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voxel.setMaterial(0);
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voxel.setDensity(MaterialDensityPair44::getMinDensity());
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}
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// Voxel position within a block always start from zero. So if a block represents region (4, 8, 12) to (11, 19, 15)
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// then the valid block voxels are from (0, 0, 0) to (7, 11, 3). Hence we subtract the lower corner position of the
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// region from the volume space position in order to get the block space position.
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block.setVoxelAt(x - region.getLowerX(), y - region.getLowerY(), z - region.getLowerZ(), voxel);
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}
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}
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}
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// Now compress the computed data into the provided block.
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RLEBlockCompressor<MaterialDensityPair44>* compressor = new RLEBlockCompressor<MaterialDensityPair44>();
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compressor->compress(&block, pBlockData);
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delete compressor;
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}
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virtual void pageOut(const PolyVox::Region& region, CompressedBlock<MaterialDensityPair44>* /*pBlockData*/)
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{
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std::cout << "warning unloading region: " << region.getLowerCorner() << " -> " << region.getUpperCorner() << std::endl;
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}
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};
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int main(int argc, char *argv[])
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{
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//Create and show the Qt OpenGL window
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QApplication app(argc, argv);
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OpenGLWidget openGLWidget(0);
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openGLWidget.show();
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RLEBlockCompressor<MaterialDensityPair44>* compressor = new RLEBlockCompressor<MaterialDensityPair44>();
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PerlinNoisePager* pager = new PerlinNoisePager();
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LargeVolume<MaterialDensityPair44> volData(PolyVox::Region::MaxRegion, compressor, pager, 256);
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volData.setMaxNumberOfBlocksInMemory(4096);
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volData.setMaxNumberOfUncompressedBlocks(64);
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//volData.setMaxNumberOfUncompressedBlocks(4096);
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//createSphereInVolume(volData, 30);
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//createPerlinTerrain(volData);
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//createPerlinVolumeSlow(volData);
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std::cout << "Memory usage: " << (volData.calculateSizeInBytes()/1024.0/1024.0) << "MB" << std::endl;
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std::cout << "Compression ratio: 1 to " << (1.0/(volData.calculateCompressionRatio())) << std::endl;
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//volData.setBlockCacheSize(64);
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PolyVox::Region reg(Vector3DInt32(-255,0,0), Vector3DInt32(255,255,255));
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std::cout << "Prefetching region: " << reg.getLowerCorner() << " -> " << reg.getUpperCorner() << std::endl;
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volData.prefetch(reg);
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std::cout << "Memory usage: " << (volData.calculateSizeInBytes()/1024.0/1024.0) << "MB" << std::endl;
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std::cout << "Compression ratio: 1 to " << (1.0/(volData.calculateCompressionRatio())) << std::endl;
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PolyVox::Region reg2(Vector3DInt32(0,0,0), Vector3DInt32(255,255,255));
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std::cout << "Flushing region: " << reg2.getLowerCorner() << " -> " << reg2.getUpperCorner() << std::endl;
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volData.flush(reg2);
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std::cout << "Memory usage: " << (volData.calculateSizeInBytes()/1024.0/1024.0) << "MB" << std::endl;
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std::cout << "Compression ratio: 1 to " << (1.0/(volData.calculateCompressionRatio())) << std::endl;
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std::cout << "Flushing entire volume" << std::endl;
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volData.flushAll();
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std::cout << "Memory usage: " << (volData.calculateSizeInBytes()/1024.0/1024.0) << "MB" << std::endl;
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std::cout << "Compression ratio: 1 to " << (1.0/(volData.calculateCompressionRatio())) << std::endl;
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//Extract the surface
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auto mesh = extractCubicMesh(&volData, reg);
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std::cout << "#vertices: " << mesh.getNoOfVertices() << std::endl;
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//Pass the surface to the OpenGL window
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openGLWidget.addMesh(mesh);
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//Run the message pump.
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return app.exec();
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}
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