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_webgpu.cpp

@@ -7220,6 +7220,13 @@ WGPU_IMPORT
 
 				if (isCompute)
 				{
+					if (viewChanged
+					&&  NULL != computePassEncoder)
+					{
+						WGPU_CHECK(wgpuComputePassEncoderEnd(computePassEncoder) );
+						wgpuRelease(computePassEncoder);
+					}
+
 					if (NULL == computePassEncoder)
 					{
 						BGFX_WGPU_PROFILER_END();
@@ -7232,6 +7239,12 @@ WGPU_IMPORT
 							wgpuRelease(renderPassEncoder);
 						}
 
+						if (viewChanged)
+						{
+							submitUniformCache(ucs, view);
+							submitBlit(bs, view);
+						}
+
 						WGPUCommandEncoder cmdEncoder = m_cmd.alloc();
 						computePassEncoder = WGPU_CHECK(wgpuCommandEncoderBeginComputePass(cmdEncoder, NULL) );
 					}