public void Set(params VkAttachmentDescription[] value)
{
IntPtr ptr = (IntPtr)this.pointer;
value.Set(ref ptr, ref this.count);
this.pointer = (VkAttachmentDescription *)ptr;
}
public VkAttachmentDescriptionGroup(params VkAttachmentDescription[] value)
{
this.count = 0;
this.pointer = null;
if (value != null)
{
IntPtr ptr = IntPtr.Zero;
value.Set(ref ptr, ref this.count);
this.pointer = (VkAttachmentDescription *)ptr;
}
}
internal void CreateRenderPass()
{
VkFormat color_format = SwapChain.color_format;
VkFormat depth_format = SwapChain.DepthStencil.Format;
// Descriptors for the attachments used by this renderpass
VkAttachmentDescription *attachments = stackalloc VkAttachmentDescription[2]
{
// Color attachment
new VkAttachmentDescription
{
format = color_format, // Use the color format selected by the swapchain
samples = VkSampleCountFlags.Count1, // We don't use multi sampling in this example
loadOp = VkAttachmentLoadOp.Clear, // Clear this attachment at the start of the render pass
storeOp = VkAttachmentStoreOp.Store, // Keep it's contents after the render pass is finished (for displaying it)
stencilLoadOp = VkAttachmentLoadOp.DontCare, // We don't use stencil, so don't care for load
stencilStoreOp = VkAttachmentStoreOp.DontCare, // Same for store
initialLayout = VkImageLayout.Undefined, // Layout at render pass start. Initial doesn't matter, so we use undefined
finalLayout = VkImageLayout.PresentSrcKHR // Layout to which the attachment is transitioned when the render pass is finished
},
// Use the color format selected by the swapchain
// As we want to present the color buffer to the swapchain, we transition to PRESENT_KHR
// Depth attachment
// A proper depth format is selected in the example base
new VkAttachmentDescription
{
format = depth_format, // A proper depth format is selected in the example base
samples = VkSampleCountFlags.Count1,
loadOp = VkAttachmentLoadOp.Clear, // Clear depth at start of first subpass
storeOp = VkAttachmentStoreOp.DontCare, // We don't need depth after render pass has finished (DONT_CARE may result in better performance)
stencilLoadOp = VkAttachmentLoadOp.DontCare, // No stencil
stencilStoreOp = VkAttachmentStoreOp.DontCare, // No Stencil
initialLayout = VkImageLayout.Undefined, // Layout at render pass start. Initial doesn't matter, so we use undefined
finalLayout = VkImageLayout.ColorAttachmentOptimal // Transition to depth/stencil attachment
},
};
// Setup attachment references
VkAttachmentReference *colorReferences = stackalloc VkAttachmentReference[1]
{
new VkAttachmentReference // Attachment layout used as color during the subpass
{
attachment = 0, // Attachment 0 is color
layout = VkImageLayout.ColorAttachmentOptimal
}
};
VkAttachmentReference depthReference = new VkAttachmentReference
{
attachment = 1, // Attachment 1 is color
layout = VkImageLayout.DepthStencilAttachmentOptimal // Attachment used as depth/stemcil used during the subpass
};
// Setup a single subpass reference
VkSubpassDescription *subpass_description = stackalloc VkSubpassDescription[1]
{
new VkSubpassDescription
{
pipelineBindPoint = VkPipelineBindPoint.Graphics,
colorAttachmentCount = 1, // Subpass uses one color attachment
pColorAttachments = colorReferences, // Reference to the color attachment in slot 0
pDepthStencilAttachment = &depthReference, // Reference to the depth attachment in slot 1
inputAttachmentCount = 0, // Input attachments can be used to sample from contents of a previous subpass
pInputAttachments = null, // (Input attachments not used by this example)
preserveAttachmentCount = 0, // Preserved attachments can be used to loop (and preserve) attachments through subpasses
pPreserveAttachments = null, // (Preserve attachments not used by this example)
pResolveAttachments = null // Resolve attachments are resolved at the end of a sub pass and can be used for e.g. multi sampling
},
};
// Setup subpass dependencies
// These will add the implicit ttachment layout transitionss specified by the attachment descriptions
// The actual usage layout is preserved through the layout specified in the attachment reference
// Each subpass dependency will introduce a memory and execution dependency between the source and dest subpass described by
// srcStageMask, dstStageMask, srcAccessMask, dstAccessMask (and dependencyFlags is set)
// Note: VK_SUBPASS_EXTERNAL is a special constant that refers to all commands executed outside of the actual renderpass)
VkSubpassDependency *dependencies = stackalloc VkSubpassDependency[2]
{
// First dependency at the start of the renderpass
// Does the transition from final to initial layout
new VkSubpassDependency
{
srcSubpass = SubpassExternal, // Producer of the dependency
dstSubpass = 0, // Consumer is our single subpass that will wait for the execution depdendency
srcStageMask = VkPipelineStageFlags.BottomOfPipe,
dstStageMask = VkPipelineStageFlags.ColorAttachmentOutput,
srcAccessMask = VkAccessFlags.MemoryRead,
dstAccessMask = VkAccessFlags.ColorAttachmentRead | VkAccessFlags.ColorAttachmentWrite,
dependencyFlags = VkDependencyFlags.ByRegion
},
// Second dependency at the end the renderpass
// Does the transition from the initial to the final layout
new VkSubpassDependency
{
srcSubpass = 0, // Producer of the dependency is our single subpass
dstSubpass = SubpassExternal, // Consumer are all commands outside of the renderpass
srcStageMask = VkPipelineStageFlags.ColorAttachmentOutput,
dstStageMask = VkPipelineStageFlags.BottomOfPipe,
srcAccessMask = VkAccessFlags.ColorAttachmentRead | VkAccessFlags.ColorAttachmentWrite,
dstAccessMask = VkAccessFlags.MemoryRead,
dependencyFlags = VkDependencyFlags.ByRegion
}
};
// Create the actual renderpass
VkRenderPassCreateInfo render_pass_info = new VkRenderPassCreateInfo()
{
sType = VkStructureType.RenderPassCreateInfo,
attachmentCount = 2, // Number of attachments used by this render pass
pAttachments = attachments, // Descriptions of the attachments used by the render pass
subpassCount = 1, // We only use one subpass in this example
pSubpasses = subpass_description, // Description of that subpass
dependencyCount = 2, // Number of subpass dependencies
pDependencies = dependencies,
};
vkCreateRenderPass(NativeDevice.handle, &render_pass_info, null, out renderPass).CheckResult();
}
private VkRenderPass CreateRenderPass()
{
VkAttachmentDescription *attachments = stackalloc VkAttachmentDescription[2]
{
// Color attachment.
new VkAttachmentDescription
{
format = SwapchainFormat,
samples = VkSampleCountFlags.Count1,
loadOp = VkAttachmentLoadOp.Clear,
storeOp = VkAttachmentStoreOp.Store,
stencilLoadOp = VkAttachmentLoadOp.DontCare,
stencilStoreOp = VkAttachmentStoreOp.DontCare,
initialLayout = VkImageLayout.Undefined,
finalLayout = VkImageLayout.PresentSrcKHR
},
// Depth attachment.
new VkAttachmentDescription
{
format = _depthStencilBuffer.Format,
samples = VkSampleCountFlags.Count1,
loadOp = VkAttachmentLoadOp.Clear,
storeOp = VkAttachmentStoreOp.DontCare,
stencilLoadOp = VkAttachmentLoadOp.DontCare,
stencilStoreOp = VkAttachmentStoreOp.DontCare,
initialLayout = VkImageLayout.Undefined,
finalLayout = VkImageLayout.DepthStencilAttachmentOptimal
}
};
VkAttachmentReference colorAttachment = new VkAttachmentReference
{
attachment = 0,
layout = VkImageLayout.ColorAttachmentOptimal
};
VkAttachmentReference depthStencilAttachment = new VkAttachmentReference
{
attachment = 1,
layout = VkImageLayout.DepthStencilAttachmentOptimal
};
var subpass = new VkSubpassDescription
{
colorAttachmentCount = 1,
pColorAttachments = &colorAttachment,
pDepthStencilAttachment = &depthStencilAttachment
};
VkSubpassDependency *dependencies = stackalloc VkSubpassDependency[2]
{
new VkSubpassDependency
{
srcSubpass = uint.MaxValue, // SubpassExternal ?
dstSubpass = 0,
srcStageMask = VkPipelineStageFlags.BottomOfPipe,
dstStageMask = VkPipelineStageFlags.ColorAttachmentOutput,
srcAccessMask = VkAccessFlags.MemoryRead,
dstAccessMask = VkAccessFlags.ColorAttachmentRead | VkAccessFlags.ColorAttachmentWrite,
dependencyFlags = VkDependencyFlags.ByRegion
},
new VkSubpassDependency
{
srcSubpass = 0,
dstSubpass = uint.MaxValue, // SubpassExternal ?
srcStageMask = VkPipelineStageFlags.ColorAttachmentOutput,
dstStageMask = VkPipelineStageFlags.BottomOfPipe,
srcAccessMask = VkAccessFlags.ColorAttachmentRead | VkAccessFlags.ColorAttachmentWrite,
dstAccessMask = VkAccessFlags.MemoryRead,
dependencyFlags = VkDependencyFlags.ByRegion
}
};
var createInfo = new VkRenderPassCreateInfo
{
sType = VkStructureType.RenderPassCreateInfo,
pNext = null,
subpassCount = 1,
pSubpasses = &subpass,
attachmentCount = 2,
pAttachments = attachments,
dependencyCount = 2,
pDependencies = dependencies
};
VkRenderPass renderPass;
vkCreateRenderPass(Context.Device, &createInfo, null, out renderPass).CheckResult();
return(renderPass);
}
