Method GetData

trinity/Tr2DirectInstanceData.cpp:168–204

-------------------------------------------------------------------------------------- Description: Allocates memory for instance data (if passed instance count is different from previous one) and returns it. Arguments: count - Number of instances Return value: Instance data buffer --------------------------------------------------------------------------------------

//   Instance data buffer
// --------------------------------------------------------------------------------------
void* Tr2DirectInstanceData::GetData( unsigned count )
{
	if( count != m_count )
	{
		m_count = count;
	}

	if( !m_stride || !m_count )
	{
		return nullptr;
	}

	USE_MAIN_THREAD_RENDER_CONTEXT();

	if( !m_vertexBuffer.IsValid() || m_vertexBuffer.GetDesc().count < m_count )
	{
		m_vertexBuffer = Tr2BufferAL();
		auto hr = m_vertexBuffer.Create(
			m_stride,
			m_count,
			Tr2GpuUsage::VERTEX_BUFFER,
			Tr2CpuUsage::WRITE_OFTEN,
			nullptr,
			renderContext );
		if( FAILED( hr ) )
		{
			return nullptr;
		}
	}
	uint8_t* data = nullptr;
	if( FAILED( m_vertexBuffer.MapForWriting( data, renderContext ) ) )
	{
		return nullptr;
	}

	return data;
}

// --------------------------------------------------------------------------------------
// Description: