Fix incorrect depth buffer option in OpenXR

modules/openxr/extensions/openxr_vulkan_extension.cpp

@@ -233,9 +233,9 @@ void OpenXRVulkanExtension::get_usable_swapchain_formats(Vector<int64_t> &p_usab
 }
 
 void OpenXRVulkanExtension::get_usable_depth_formats(Vector<int64_t> &p_usable_swap_chains) {
-	p_usable_swap_chains.push_back(VK_FORMAT_R32_SFLOAT);
 	p_usable_swap_chains.push_back(VK_FORMAT_D24_UNORM_S8_UINT);
 	p_usable_swap_chains.push_back(VK_FORMAT_D32_SFLOAT_S8_UINT);
+	p_usable_swap_chains.push_back(VK_FORMAT_D32_SFLOAT);
 }
 
 bool OpenXRVulkanExtension::get_swapchain_image_data(XrSwapchain p_swapchain, int64_t p_swapchain_format, uint32_t p_width, uint32_t p_height, uint32_t p_sample_count, uint32_t p_array_size, void **r_swapchain_graphics_data) {
@@ -308,8 +308,8 @@ bool OpenXRVulkanExtension::get_swapchain_image_data(XrSwapchain p_swapchain, in
 			format = RenderingDevice::DATA_FORMAT_B8G8R8A8_UINT;
 			usage_flags |= RenderingDevice::TEXTURE_USAGE_COLOR_ATTACHMENT_BIT;
 			break;
-		case VK_FORMAT_R32_SFLOAT:
-			format = RenderingDevice::DATA_FORMAT_R32_SFLOAT;
+		case VK_FORMAT_D32_SFLOAT:
+			format = RenderingDevice::DATA_FORMAT_D32_SFLOAT;
 			usage_flags |= RenderingDevice::TEXTURE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
 			break;
 		case VK_FORMAT_D24_UNORM_S8_UINT:

modules/openxr/openxr_api.cpp

@@ -855,18 +855,19 @@ bool OpenXRAPI::create_swapchains() {
 		}
 
 		if (swapchain_format_to_use == 0) {
-			swapchain_format_to_use = usable_swapchain_formats[0]; // just use the first one and hope for the best...
-			print_line("Couldn't find usable depth swap chain format, using", get_swapchain_format_name(swapchain_format_to_use), "instead.");
+			print_line("Couldn't find usable depth swap chain format, depth buffer will not be submitted.");
 		} else {
 			print_verbose(String("Using depth swap chain format:") + get_swapchain_format_name(swapchain_format_to_use));
-		}
 
-		if (!create_swapchain(XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT, swapchain_format_to_use, recommended_size.width, recommended_size.height, view_configuration_views[0].recommendedSwapchainSampleCount, view_count, swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain, &swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain_graphics_data)) {
-			return false;
-		}
+			// Note, if VK_FORMAT_D32_SFLOAT is used here but we're using the forward+ renderer, we should probably output a warning.
 
-		depth_views = (XrCompositionLayerDepthInfoKHR *)memalloc(sizeof(XrCompositionLayerDepthInfoKHR) * view_count);
-		ERR_FAIL_NULL_V_MSG(depth_views, false, "OpenXR Couldn't allocate memory for depth views");
+			if (!create_swapchain(XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT, swapchain_format_to_use, recommended_size.width, recommended_size.height, view_configuration_views[0].recommendedSwapchainSampleCount, view_count, swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain, &swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain_graphics_data)) {
+				return false;
+			}
+
+			depth_views = (XrCompositionLayerDepthInfoKHR *)memalloc(sizeof(XrCompositionLayerDepthInfoKHR) * view_count);
+			ERR_FAIL_NULL_V_MSG(depth_views, false, "OpenXR Couldn't allocate memory for depth views");
+		}
 	}
 
 	// We create our velocity swapchain if:
@@ -1837,6 +1838,7 @@ RID OpenXRAPI::get_color_texture() {
 }
 
 RID OpenXRAPI::get_depth_texture() {
+	// Note, image will not be acquired if we didn't have a suitable swap chain format.
 	if (submit_depth_buffer && swapchains[OPENXR_SWAPCHAIN_DEPTH].image_acquired) {
 		return graphics_extension->get_texture(swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain_graphics_data, swapchains[OPENXR_SWAPCHAIN_DEPTH].image_index);
 	} else {