93 lines
4.7 KiB
C++
93 lines
4.7 KiB
C++
/****************************************************************************
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#ifndef __CONE_BUILDER_H__
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#define __CONE_BUILDER_H__
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#include "meshbuilder/meshbuilder.h"
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#include "math/float3.h"
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namespace MeshBuilder
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{
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#define CONE_VERTEX_COUNT(tessellation) tessellation + 2
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#define CONE_INDEX_COUNT(tessellation) tessellation * 6//tessellation * 2 * 3;
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// 第一个顶点为底面圆心，第二个顶点为锥顶，后面的顶点为地面边缘顶点（如果中心点设在了坐标原点，则第一个顶点在x轴上，其余顺时针排列）。
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// 所谓tessellation，意思就是圆锥的底面的边缘的顶点个数
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class ConeBuilder
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{
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public:
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//tessellation下的顶点总数
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static SizeT VertexCount(SizeT tessellation);
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//tessellation下索引总数
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static SizeT IndexCount(SizeT tessellation);
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// set indices
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static void SetIndices(ushort* buffer, SizeT tessellation);
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// buffer: vertex buffer, vertexSize: a vertex element's size, posBias: the starting location(in bytes) of position data in a vertex element
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// tessellation: tessellation, r: the radius of bottom, topHeight: the cone's height, center: the centre of bottom
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template<typename T>
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static void SetPositions(T* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center);
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// buffer: vertex buffer, vertexSize: a vertex element's size, normalBias: the starting location(in bytes) of normal data in a vertex element
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// tessellation: tessellation
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// posBuffer: vertex buffer, posBufferVertexSize: a vertex element's size of posBuffer, posBias: the starting location(in bytes) of position data in a vertex element of posBuffer
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template<typename T1, typename T2>
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static void SetNormals(T1* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const T2* posBuffer, SizeT posBufferVertexSize, SizeT posBias);
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private:
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static void setPositions(ubyte* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center);
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static void setNormals(ubyte* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const ubyte* posBuffer, SizeT posBufferVertexSize, SizeT posBias);
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static void setCircleVector(float angle, Math::float3& dir);
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static void calBottomNormal(elem_iterator_const<Math::float3> begin, SizeT tessellation, Math::float3& bottomNormal);
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static void calBottomSidePosNormal(const Math::float3& curPos, const Math::float3& nextPos, const Math::float3& prePos, const Math::float3& topPos, const Math::float3& bottomNormal, Math::float3& normal);
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static void calNormal(const Math::float3& point0, const Math::float3& point1, const Math::float3& point2, Math::float3& normal);
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ConeBuilder();
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};
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template<typename T>
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inline void ConeBuilder::SetPositions(T* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center)
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{
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setPositions(reinterpret_cast<ubyte*>(buffer), vertexSize, posBias, tessellation, r, topHeight, center);
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}
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template<typename T1, typename T2>
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inline void ConeBuilder::SetNormals(T1* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const T2* posBuffer, SizeT posBufferVertexSize, SizeT posBias)
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{
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setNormals(reinterpret_cast<ubyte*>(buffer),vertexSize,normalBias,tessellation,
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reinterpret_cast<const ubyte*>(posBuffer), posBufferVertexSize, posBias);
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}
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inline SizeT ConeBuilder::VertexCount(SizeT tessellation)
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{
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n_assert(tessellation > 2);
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return CONE_VERTEX_COUNT(tessellation);
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}
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inline SizeT ConeBuilder::IndexCount(SizeT tessellation)
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{
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n_assert(tessellation > 2);
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return CONE_INDEX_COUNT(tessellation);
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}
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}
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#endif //__CONE_BUILDER_H__
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