st/oxr: Tidy Swapchain API file

Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2619>

src/xrt/state_trackers/oxr/oxr_api_swapchain.c

@@ -1,4 +1,5 @@
 // Copyright 2019-2020, Collabora, Ltd.
+// Copyright 2024-2025, NVIDIA CORPORATION.
 // SPDX-License-Identifier: BSL-1.0
 /*!
  * @file
@@ -82,6 +83,12 @@ oxr_xrCreateSwapchain(XrSession session, const XrSwapchainCreateInfo *createInfo
 
 	// Short hand.
 	struct oxr_instance *inst = sess->sys->inst;
+	struct xrt_compositor_info *xc_info = &sess->compositor->info;
+
+
+	/*
+	 * Usage flags.
+	 */
 
 	XrSwapchainUsageFlags flags = 0;
 	flags |= XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT;
@@ -102,10 +109,15 @@ oxr_xrCreateSwapchain(XrSession session, const XrSwapchainCreateInfo *createInfo
 		                 "(createInfo->usageFlags == 0x%04" PRIx64 ") contains invalid flags",
 		                 createInfo->usageFlags);
 	}
+
+
+	/*
+	 * Format.
+	 */
+
 	bool format_supported = false;
-	struct xrt_compositor *c = sess->compositor;
-	for (uint32_t i = 0; i < c->info.format_count; i++) {
-		if (c->info.formats[i] == createInfo->format) {
+	for (uint32_t i = 0; i < xc_info->format_count; i++) {
+		if (xc_info->formats[i] == createInfo->format) {
 			format_supported = true;
 			break;
 		}
@@ -116,6 +128,11 @@ oxr_xrCreateSwapchain(XrSession session, const XrSwapchainCreateInfo *createInfo
 		                 "(createInfo->format == 0x%04" PRIx64 ") is not supported", createInfo->format);
 	}
 
+
+	/*
+	 * Format list.
+	 */
+
 #ifdef OXR_HAVE_KHR_vulkan_swapchain_format_list
 	const XrVulkanSwapchainFormatListCreateInfoKHR *format_list = NULL;
 	if (sess->sys->inst->extensions.KHR_vulkan_swapchain_format_list) {
@@ -137,6 +154,11 @@ oxr_xrCreateSwapchain(XrSession session, const XrSwapchainCreateInfo *createInfo
 	}
 #endif
 
+
+	/*
+	 * Validation done.
+	 */
+
 	ret = sess->create_swapchain(&log, sess, createInfo, &sc);
 	if (ret != XR_SUCCESS) {
 		return ret;