Function CreateGeometryBatch

trinity/Tr2MeshBase.cpp:372–424

}

Tr2RenderBatch CreateGeometryBatch( TriGeometryResLodData* lod, Tr2MeshArea* area, const Tr2PerObjectData* data )
{
	Tr2RenderBatch batch;

	if( !area->GetDisplay() || !lod->m_allocationsValid )
	{
		return batch;
	}

	auto shadMat = area->GetMaterialInterface();
	if( !shadMat || !shadMat->GetShaderStateInterface() )
	{
		return batch;
	}

	auto primCount = GetPrimitiveCount( *lod, std::max( 0, area->GetIndex() ), std::max( 0, area->GetCount() ) );

	if( !primCount )
	{
		return batch;
	}

	auto& meshArea = lod->m_areas[std::max( 0, area->GetIndex() )];

	if( area->GetReversed() && !lod->m_reversedIndicesValid )
	{
		return batch;
	}

	batch.SetMaterial( shadMat );
	batch.SetGeometry( lod->m_mesh->m_vertexDeclarationHandle, lod->m_vertexAllocation, lod->m_indexAllocation );

	batch.SetPerObjectData( data );

	auto& indices = area->GetReversed() ? lod->m_reversedIndexAllocation : lod->m_indexAllocation;
	uint32_t startIndex;
	if( area->GetReversed() )
	{
		startIndex = indices.GetStartIndex() + lod->m_primitiveCount * 3 - meshArea.m_firstIndex - primCount * 3;
	}
	else
	{
		startIndex = indices.GetStartIndex() + meshArea.m_firstIndex;
	}

	batch.SetDrawIndexedInstanced(
		primCount * 3,
		1,
		startIndex,
		lod->m_vertexAllocation.GetOffset() / lod->m_vertexAllocation.GetStride(),
		0 );
	return batch;
}