// Helper function to create a renderpass (and fill a list) from a set of render targets
// The color attachments will always come first, in the order they are specified
private static Vk.RenderPass CreateRenderPass(Vk.Device device, PipelineDescription desc, List <RenderTarget> rts)
{
// Fill the list
rts.Clear();
if (desc.HasColorTargets)
{
rts.AddRange(desc.ColorTargets);
}
if (desc.HasDepthTarget)
{
rts.Add(desc.DepthTarget);
}
// Collect the attachment descriptions and create the references
Vk.AttachmentDescription[] atts = new Vk.AttachmentDescription[desc.TargetCount];
Vk.AttachmentReference[] crefs = new Vk.AttachmentReference[desc.TargetCount - (desc.HasDepthTarget ? 1 : 0)];
if (desc.HasColorTargets)
{
for (int i = 0; i < desc._colorAIs.Length; ++i)
{
atts[i] = desc._colorAIs[i];
crefs[i] = new Vk.AttachmentReference(i, desc.ColorTargets[i].DefaultImageLayout);
}
}
if (desc.HasDepthTarget)
{
atts[atts.Length - 1] = desc._depthAI.Value;
}
// Specify the lone subpass
Vk.SubpassDescription subpass = new Vk.SubpassDescription(
colorAttachments: crefs,
depthStencilAttachment: desc.HasDepthTarget ?
new Vk.AttachmentReference(atts.Length - 1, desc.DepthTarget.DefaultImageLayout) : (Vk.AttachmentReference?)null
);
// Create the renderpass
var rpci = new Vk.RenderPassCreateInfo(
new[] { subpass },
attachments: atts,
dependencies: new[] { // Create a two dependencies so that the color and depth buffers do not overwrite each other
// TODO: Validate the flags used in these
new Vk.SubpassDependency(Vk.Constant.SubpassExternal, 0, Vk.PipelineStages.ColorAttachmentOutput,
Vk.PipelineStages.ColorAttachmentOutput, Vk.Accesses.None, Vk.Accesses.ColorAttachmentRead,
Vk.Dependencies.ByRegion),
new Vk.SubpassDependency(Vk.Constant.SubpassExternal, 0, Vk.PipelineStages.LateFragmentTests,
Vk.PipelineStages.EarlyFragmentTests, Vk.Accesses.None, Vk.Accesses.DepthStencilAttachmentRead,
Vk.Dependencies.ByRegion)
}
);
return(device.CreateRenderPass(rpci));
}
internal RenderPass(Device parent, ref RenderPassCreateInfo createInfo, ref AllocationCallbacks?allocator)
{
Parent = parent;
Allocator = allocator;
fixed(AttachmentDescription *attachmentsPtr = createInfo.Attachments)
fixed(SubpassDependency * dependenciesPtr = createInfo.Dependencies)
{
createInfo.ToNative(out RenderPassCreateInfo.Native nativeCreateInfo, attachmentsPtr, dependenciesPtr);
long handle;
Result result = vkCreateRenderPass(Parent, &nativeCreateInfo, NativeAllocator, &handle);
nativeCreateInfo.Free();
VulkanException.ThrowForInvalidResult(result);
Handle = handle;
}
}
/// <summary>
/// Create a new render pass object.
/// </summary>
/// <param name="createInfo">
/// The structure that describes the parameters of the render pass.
/// </param>
/// <param name="allocator">Controls host memory allocation.</param>
/// <returns>The resulting render pass object.</returns>
/// <exception cref="VulkanException">Vulkan returns an error code.</exception>
public RenderPass CreateRenderPass(RenderPassCreateInfo createInfo, AllocationCallbacks?allocator = null)
{
return(new RenderPass(this, ref createInfo, ref allocator));
}