91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
// Copyright (C) 2017 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Utility module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Utility/TriangleIterator.hpp>
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#include <Nazara/Utility/SubMesh.hpp>
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#include <Nazara/Utility/Debug.hpp>
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namespace Nz
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{
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TriangleIterator::TriangleIterator(PrimitiveMode primitiveMode, const IndexBuffer* indexBuffer) :
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m_primitiveMode(primitiveMode),
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m_indexMapper(indexBuffer, BufferAccess_ReadOnly)
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{
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m_currentIndex = 3;
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m_triangleIndices[0] = m_indexMapper.Get(0);
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m_triangleIndices[1] = m_indexMapper.Get(1);
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m_triangleIndices[2] = m_indexMapper.Get(2);
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m_indexCount = m_indexMapper.GetIndexCount();
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}
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TriangleIterator::TriangleIterator(const SubMesh* subMesh) :
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m_primitiveMode(subMesh->GetPrimitiveMode()),
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m_indexMapper(subMesh, BufferAccess_ReadOnly)
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{
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m_currentIndex = 3;
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m_triangleIndices[0] = m_indexMapper.Get(0);
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m_triangleIndices[1] = m_indexMapper.Get(1);
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m_triangleIndices[2] = m_indexMapper.Get(2);
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m_indexCount = m_indexMapper.GetIndexCount();
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}
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bool TriangleIterator::Advance()
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{
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if (m_currentIndex >= m_indexCount)
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{
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Unmap();
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return false;
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}
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switch (m_primitiveMode)
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{
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case PrimitiveMode_TriangleFan:
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m_triangleIndices[1] = m_indexMapper.Get(m_currentIndex++);
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m_triangleIndices[2] = m_indexMapper.Get(m_currentIndex++);
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break;
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case PrimitiveMode_TriangleList:
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m_triangleIndices[0] = m_indexMapper.Get(m_currentIndex++);
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m_triangleIndices[1] = m_indexMapper.Get(m_currentIndex++);
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m_triangleIndices[2] = m_indexMapper.Get(m_currentIndex++);
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break;
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case PrimitiveMode_TriangleStrip:
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m_triangleIndices[2] = m_indexMapper.Get(m_currentIndex++);
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m_triangleIndices[0] = m_triangleIndices[1];
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m_triangleIndices[1] = m_triangleIndices[2];
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break;
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default:
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return false;
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}
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return true;
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}
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UInt32 TriangleIterator::operator[](unsigned int i) const
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{
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#if NAZARA_UTILITY_SAFE
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if (i >= 3)
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{
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StringStream ss;
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ss << "Index out of range: (" << i << " >= 3)";
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NazaraError(ss);
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throw std::domain_error(ss.ToString());
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}
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#endif
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return m_triangleIndices[i];
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}
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void TriangleIterator::Unmap()
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{
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// Peut très bien être appellé plusieurs fois de suite, seul le premier appel sera pris en compte
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m_indexMapper.Unmap();
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}
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}
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