VK/WGPU: drain a view's blits and uniform cache before its dispatches. VK: block on the swapchain image of window framebuffers on a headless device (#3989)

src/renderer_vk.cpp

@@ -3476,8 +3476,12 @@ VK_IMPORT_DEVICE
 						);
 				}
 
+				const bool block = !isValid(_fbh)
+					|| NULL == m_backBuffer.m_swapChain.m_nwh
+					;
+
 				int64_t start = bx::getHPCounter();
-				newFrameBuffer.acquire(m_commandBuffer, !isValid(_fbh) );
+				newFrameBuffer.acquire(m_commandBuffer, block);
 				m_presentElapsed += bx::getHPCounter() - start;
 			}
 
@@ -10778,6 +10782,12 @@ VK_DESTROY
 						}
 					}
 
+					if (viewChanged)
+					{
+						submitUniformCache(ucs, view);
+						submitBlit(bs, view);
+					}
+
 					// renderpass external subpass dependencies handle graphics -> compute and compute -> graphics
 					// but not compute -> compute (possibly also across views if they contain no draw calls)
 					setMemoryBarrier(