Method Transition

vgpu/image.go:941–993

Transition transitions image to new layout

(cmd vk.CommandBuffer, format vk.Format, oldLayout, NewLayout vk.ImageLayout, srcStage, dstStage vk.PipelineStageFlagBits)

// Transition transitions image to new layout
func (im *Image) Transition(cmd vk.CommandBuffer, format vk.Format, oldLayout, NewLayout vk.ImageLayout, srcStage, dstStage vk.PipelineStageFlagBits) {

	imgMemBar := vk.ImageMemoryBarrier{
		SType:               vk.StructureTypeImageMemoryBarrier,
		SrcQueueFamilyIndex: vk.QueueFamilyIgnored,
		DstQueueFamilyIndex: vk.QueueFamilyIgnored,
		OldLayout:           oldLayout,
		NewLayout:           NewLayout,
		Image:               im.Image,
		SubresourceRange: vk.ImageSubresourceRange{
			AspectMask: vk.ImageAspectFlags(vk.ImageAspectColorBit),
			LayerCount: uint32(im.Format.Layers),
			LevelCount: 1,
		},
	}

	switch NewLayout {
	case vk.ImageLayoutTransferDstOptimal:
		// make sure anything that was copying from this image has completed
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessTransferWriteBit)

	case vk.ImageLayoutColorAttachmentOptimal:
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessColorAttachmentWriteBit)

	case vk.ImageLayoutDepthStencilAttachmentOptimal:
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessDepthStencilAttachmentWriteBit)

	case vk.ImageLayoutShaderReadOnlyOptimal:
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessShaderReadBit)
		//  | vk.AccessFlags(vk.AccessInputAttachmentReadBit)
		if oldLayout == vk.ImageLayoutTransferDstOptimal {
			imgMemBar.SrcAccessMask = vk.AccessFlags(vk.AccessTransferWriteBit)
		}

	case vk.ImageLayoutTransferSrcOptimal:
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessTransferReadBit)

	case vk.ImageLayoutPresentSrc:
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessMemoryReadBit)

	case vk.ImageLayoutGeneral:
		if oldLayout == vk.ImageLayoutTransferDstOptimal {
			imgMemBar.SrcAccessMask = vk.AccessFlags(vk.AccessTransferWriteBit)
		}
		imgMemBar.DstAccessMask = vk.AccessFlags(vk.AccessMemoryReadBit)

	default:
		imgMemBar.DstAccessMask = 0
	}

	vk.CmdPipelineBarrier(cmd, vk.PipelineStageFlags(srcStage), vk.PipelineStageFlags(dstStage),
		0, 0, nil, 0, nil, 1, []vk.ImageMemoryBarrier{imgMemBar})
}

/////////////////////////////////////////////////////////////////////
// HostImage