68 lines
3.0 KiB
C++
68 lines
3.0 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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#ifndef __PolyVox_Voxel_H__
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#define __PolyVox_Voxel_H__
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#include "PolyVoxImpl/TypeDef.h"
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#include <cassert>
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#include <limits>
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namespace PolyVox
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{
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// Various properties of the voxel types can be expressed via types traits, similar to the way std::numeric_limits is implemented.
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// This has some advantages compared to storing the properties directly in the voxel class. For example, by using traits it is possible
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// to also apply these properties to primative types which might be desirable (the Volume classes do accept primative types as template
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// parameters). Also, properties such as minDensity() and maxDensity() would be difficult to represent though class members because they
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// depend ont the type (float has a very different range from int8_t for example).
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//
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// The properties are currently exposed as constants because we need access to them at compile time. Ideally we would like to make them
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// functions flagged with 'constexpr' as we could then make use of the max() and min() functions in std::numeric_limits, but this is not
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// widely supported by compilers yet. We may change this in the future.
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//
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// Syntax for templatised traits classes: http://stackoverflow.com/q/8606302/849083
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template <typename Type>
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class VoxelTypeTraits
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{
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public:
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typedef uint8_t DensityType;
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typedef uint8_t MaterialType;
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// These default implementations return an int32_t rather than void so that the result can be
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// assigned to a variable for all voxel types (even those without density components). Calls
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// to these functions should be protected by calls to hasDensity(), but the compiler still
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// needs to ensure the assignment is compilable even if hasDensity() returns false.
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static int32_t minDensity() { assert(false); return 0; }
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static int32_t maxDensity() { assert(false); return 0; }
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};
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template<typename VoxelType>
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typename VoxelTypeTraits<VoxelType>::DensityType convertToDensity(VoxelType voxel)
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{
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return voxel;
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}
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}
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#endif //__PolyVox_Voxel_H__
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