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42 lines
1.5 KiB
42 lines
1.5 KiB
// David Eberly, Geometric Tools, Redmond WA 98052
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// Copyright (c) 1998-2021
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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// https://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
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// Version: 4.0.2019.08.13
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#pragma once
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#include <string>
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namespace gte
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{
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struct VertexAttribute
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{
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VertexAttribute(std::string inSemantic = "", void* inSource = nullptr, size_t inStride = 0)
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:
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semantic(inSemantic),
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source(inSource),
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stride(inStride)
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{
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}
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// The 'semantic' string allows you to query for a specific vertex
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// attribute and use the 'source' and 'stride' to access the data
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// of the attribute. For example, you might use the semantics
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// "position" (px,py,pz), "normal" (nx,ny,nz), "tcoord" (texture
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// coordinates (u,v)), "dpdu" (derivative of position with respect
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// to u), or "dpdv" (derivative of position with respect to v) for
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// mesh vertices.
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//
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// The source pointer must be 4-byte aligned. The stride must be
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// positive and a multiple of 4. The pointer alignment constraint is
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// guaranteed on 32-bit and 64-bit architectures. The stride constraint
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// is reasonable given that (usually) geometric attributes are usually
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// arrays of 'float' or 'double'.
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std::string semantic;
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void* source;
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size_t stride;
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};
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}
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