--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/semicongine/rendering/swapchain.nim	Mon Jul 08 20:13:11 2024 +0700
@@ -0,0 +1,57 @@
+const N_FRAMEBUFFERS = 3'32
+
+proc svkCreateSwapchainKHR(vSync: bool, oldSwapchain = VkSwapchainKHR(0)): VkSwapchainKHR =
+
+  var capabilities: VkSurfaceCapabilitiesKHR
+  checkVkResult device.vk.vkGetPhysicalDeviceSurfaceCapabilitiesKHR(vulkan.surface, addr(capabilities))
+
+  if capabilities.currentExtent.width == 0 or capabilities.currentExtent.height == 0:
+    return VkSwapchainKHR(0)
+
+  # following is according to vulkan specs
+  var minFramebufferCount = N_FRAMEBUFFERS
+  minFramebufferCount = max(minFramebufferCount, capabilities.minImageCount)
+  if capabilities.maxImageCount != 0:
+    minFramebufferCount = min(minFramebufferCount, capabilities.maxImageCount)
+
+  svkGetPhysicalDeviceSurfaceFormatsKHR()
+
+  let hasTripleBuffering = VK_PRESENT_MODE_MAILBOX_KHR in svkGetPhysicalDeviceSurfacePresentModesKHR()
+  var createInfo = VkSwapchainCreateInfoKHR(
+    sType: VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR,
+    surface: device.physicalDevice.surface,
+    minImageCount: minFramebufferCount,
+    imageFormat: DefaultSurfaceFormat(),
+    imageColorSpace: VK_COLOR_SPACE_SRGB_NONLINEAR_KHR, # only one supported without special extensions
+    imageExtent: capabilities.currentExtent,
+    imageArrayLayers: 1,
+    imageUsage: toBits [VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT],
+    imageSharingMode: VK_SHARING_MODE_EXCLUSIVE,
+    preTransform: capabilities.currentTransform,
+    compositeAlpha: VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR,  # only used for blending with other windows, can be opaque
+    presentMode: if (vSync or not hasTripleBuffering): VK_PRESENT_MODE_FIFO_KHR else: VK_PRESENT_MODE_MAILBOX_KHR,
+    clipped: true,
+    oldSwapchain: oldSwapchain,
+  )
+  if device.vk.vkCreateSwapchainKHR(addr(createInfo), nil, addr(result)) != VK_SUCCESS:
+    return VkSwapchainKHR(0)
+
+  if samples != VK_SAMPLE_COUNT_1_BIT:
+    vulkan.msaaImage = svkCreate2DImage(
+      width = capabilities.currentExtent.width,
+      height = capabilities.currentExtent.height,
+      format = DefaultSurfaceFormat(),
+      usage = [VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT, VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT],
+    )
+    # TODO: memory
+    vk: svkAllocateMemory(size, mType),
+    checkVkResult vkBindImageMemory(
+      vulkan.device,
+      vulkan.msaaImage,
+      selectedBlock.vk,
+      0,
+    )
+
+
+
+    vulkan.msaaImageView = svkCreate2DImageView(vulkan.msaaImageView, DefaultSurfaceFormat())