CPU Readback Synchronization Hello everyone, I'm currently trying to get CPU readback to work in Vulkan and I'm having issues getting the snychronization to work properly. I want to use the results of a subpass on the CPU. so what I do right now is copy the render target image to a staging buffer and map that buffer and simply memcpy the contents. My idea was to use a VkEvent to signal when the copy to the staging buffer has finished on the GPU so the CPU knows when to start copying valid data. However, I'm not sure if this the correct way to do it or if a VkFence is the correct choice here and if I need memory barriers or not. In addition, I of course want multiple staging buffers in flight at the same time so the CPU doesn't keep the GPU waiting and I'm not sure how to know which buffers are ready to be written to again. I'm very new to low-level GPU programming and I keep getting my GPU to crash the system, so I would be very grateful if somebody could clear things up for me :) Thanks! https://ift.tt/eA8V8J

Hello everyone, I'm currently trying to get CPU readback to work in Vulkan and I'm having issues getting the snychronization to work properly. I want to use the results of a subpass on the CPU. so what I do right now is copy the render target image to a staging buffer and map that buffer and simply memcpy the contents. My idea was to use a VkEvent to signal when the copy to the staging buffer has finished on the GPU so the CPU knows when to start copying valid data. However, I'm not sure if this the correct way to do it or if a VkFence is the correct choice here and if I need memory barriers or not. In addition, I of course want multiple staging buffers in flight at the same time so the CPU doesn't keep the GPU waiting and I'm not sure how to know which buffers are ready to be written to again. I'm very new to low-level GPU programming and I keep getting my GPU to crash the system, so I would be very grateful if somebody could clear things up for me :) Thanks!

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