Method MeshData

Engine/source/EtRendering/GraphicsTypes/Mesh.cpp:265–397

--------------------------------- MeshData::c-tor Construct Mesh data from vertex data

// Construct Mesh data from vertex data
//
MeshData::MeshData(MeshDataContainer const* const cpuData)
{
	ET_ASSERT(cpuData != nullptr);

	m_Name = cpuData->m_Name;

	m_IndexCount = cpuData->m_Indices.size();
	m_VertexCount = cpuData->m_VertexCount;
	ET_ASSERT(m_VertexCount > 0u, "Expected mesh to have vertices!");

	// Surface container will contain vertex arrays per material
	m_Surfaces = new SurfaceContainer();

	// derive flags from data sizes
	//------------------------------
	if (cpuData->m_Positions.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::POSITION;
	}
	if (cpuData->m_Normals.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::NORMAL;
	}
	if (cpuData->m_BiNormals.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::BINORMAL;
	}
	if (cpuData->m_Tangents.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::TANGENT;
	}
	if (cpuData->m_Colors.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::COLOR;
	}
	if (cpuData->m_TexCoords.size() == m_VertexCount)
	{
		m_SupportedFlags |= E_VertexFlag::TEXCOORD;
	}

	// calculate bounding sphere
	//---------------------------

	// get center
	vec3 center = vec3(0);
	for (size_t i = 0u; i < cpuData->m_Positions.size(); i++)
	{
		center = center + cpuData->m_Positions[i];
	}

	float rcp = 1.f / static_cast<float>(cpuData->m_Positions.size());
	center = center * rcp;

	// greatest distance from center
	float maxRadius = 0.f;
	for (size_t i = 0u; i < cpuData->m_Positions.size(); i++)
	{
		float dist = math::distanceSquared(center, cpuData->m_Positions[i]);