82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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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, IndexBuffer& indexBuffer) :
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m_primitiveMode(primitiveMode),
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m_indexMapper(indexBuffer)
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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(SubMesh& subMesh) :
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m_primitiveMode(subMesh.GetPrimitiveMode()),
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m_indexMapper(subMesh)
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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[](std::size_t i) const
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{
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NazaraAssert(i < 3, "Index out of range");
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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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