Manually transition swap chain image layouts

Deadly 提交于 2020-12-15 02:00:38

问题


Say I have a render pass with a single color attachment corresponding to the images of a swap chain. Usually, I would set the initialLayout and finalLayout fields of the VkAttachmentDescription to VK_IMAGE_LAYOUT_UNDEFINED and VK_IMAGE_LAYOUT_PRESENT_SRC_KHR, respectively.

Now I would like to set the initialLayout to VK_IMAGE_LAYOUT_PRESENT_SRC_KHR instead and perform the transition of a swap chain image to this state manually before the render pass begins.

I want to do this using memory barriers. So, given a generic function

void transition_image_layout(VkCommandBuffer command_buffer,
    VkImage image, VkImageLayout old_layout, VkImageLayout new_layout)
{
    VkAccessFlags src_access_mask,
        dst_access_mask;
    VkPipelineStageFlags src_stage_mask,
        dst_stage_mask;
        
    // set src_access_mask/dst_access_mask and
    // src_stage_mask/dst_stage_mask properly
    // according to old_layout/new_layout

    VkImageMemoryBarrier image_memory_barrier{};
    image_memory_barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
    image_memory_barrier.srcAccessMask;
    image_memory_barrier.dstAccessMask;
    image_memory_barrier.oldLayout = old_layout;
    image_memory_barrier.newLayout = new_layout;
    image_memory_barrier.srcQueueFamilyIndex = src_queue_family_index;
    image_memory_barrier.dstQueueFamilyIndex = dst_queue_family_index;
    image_memory_barrier.image = image;
    image_memory_barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
    image_memory_barrier.subresourceRange.levelCount = 1; 
    image_memory_barrier.subresourceRange.layerCount = 1;

    vkCmdPipelineBarrier(command_buffer, src_stage_mask, dst_stage_mask, 0, 0, nullptr, 0, nullptr, 1, &image_memory_barrier);
}

at which point before, between and after vkCmdBeginRenderPass and vkCmdEndRenderPass would I need to perform the transition and which are the appropriate values for src_access_mask/dst_access_mask and src_stage_mask/dst_stage_mask?

来源:https://stackoverflow.com/questions/65266956/manually-transition-swap-chain-image-layouts

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