st/oxr: Verify width and height on swapchain create

src/xrt/state_trackers/oxr/oxr_api_swapchain.c

@@ -59,10 +59,9 @@ oxr_xrCreateSwapchain(XrSession session,
 	OXR_VERIFY_ARG_NOT_NULL(&log, out_swapchain);
 
 	// Save people from shooting themselves in the foot.
-	if (createInfo->arraySize <= 0) {
-		return oxr_error(&log, XR_ERROR_VALIDATION_FAILURE,
-		                 "(createInfo->arraySize) must be non-zero");
-	}
+	OXR_VERIFY_ARG_NOT_ZERO(&log, createInfo->arraySize);
+	OXR_VERIFY_ARG_NOT_ZERO(&log, createInfo->width);
+	OXR_VERIFY_ARG_NOT_ZERO(&log, createInfo->height);
 
 	ret = sess->create_swapchain(&log, sess, createInfo, &sc);
 	if (ret != XR_SUCCESS) {

src/xrt/state_trackers/oxr/oxr_api_verify.h

@@ -91,6 +91,14 @@ extern "C" {
 		}                                                              \
 	} while (false)
 
+#define OXR_VERIFY_ARG_NOT_ZERO(log, arg)                                      \
+	do {                                                                   \
+		if (arg == 0) {                                                \
+			return oxr_error(log, XR_ERROR_VALIDATION_FAILURE,     \
+			                 "(" #arg " == 0) must be non-zero");  \
+		}                                                              \
+	} while (false)
+
 #define OXR_VERIFY_ARG_TYPE_AND_NULL(log, arg, type_enum)                      \
 	do {                                                                   \
 		if (arg == NULL) {                                             \