bgfx metal flip

gistfile1.txt

		void flip() override
		{
			if (NULL == m_commandBuffer)
			{
				return;
			}

			//for (uint32_t ii = 0, num = m_numWindows; ii < num; ++ii)
			if (m_numWindows > 0)
			{
				FrameBufferMtl& frameBuffer = m_mainFrameBuffer;
				if (NULL != frameBuffer.m_swapChain
				&&  frameBuffer.m_swapChain->m_drawableTexture)
				{
					MTL_RELEASE(frameBuffer.m_swapChain->m_drawableTexture);

					if (NULL != frameBuffer.m_swapChain->m_drawable)
					{
						m_commandBuffer.presentDrawable(frameBuffer.m_swapChain->m_drawable);
						MTL_RELEASE(frameBuffer.m_swapChain->m_drawable);
					}
				}
			}

			m_cmd.kick(true);
			m_commandBuffer = 0;
			
			for (uint32_t ii = 1, num = m_numWindows; ii < num; ++ii)
			{
				FrameBufferMtl& frameBuffer = m_frameBuffers[m_windows[ii].idx];
				if (NULL != frameBuffer.m_swapChain
					&&  frameBuffer.m_swapChain->m_drawableTexture)
				{
					MTL_RELEASE(frameBuffer.m_swapChain->m_drawableTexture);
					
					if (NULL != frameBuffer.m_swapChain->m_drawable)
					{
						CommandBuffer cmdBuffer = m_cmd.m_commandQueue.commandBuffer();
						cmdBuffer.presentDrawable(frameBuffer.m_swapChain->m_drawable);
						MTL_RELEASE(frameBuffer.m_swapChain->m_drawable);
						cmdBuffer.commit();
					}
				}
			}
		}