allow vulkan validation layers in release builds if explicity asked for

drivers/vulkan/vulkan_context.cpp

@@ -302,7 +302,7 @@ Error VulkanContext::_create_physical_device() {
 		/*flags*/ 0,
 		/*pApplicationInfo*/ &app,
 		/*enabledLayerCount*/ enabled_layer_count,
-		/*ppEnabledLayerNames*/ (const char *const *)instance_validation_layers,
+		/*ppEnabledLayerNames*/ (const char *const *)enabled_layers,
 		/*enabledExtensionCount*/ enabled_extension_count,
 		/*ppEnabledExtensionNames*/ (const char *const *)extension_names,
 	};

drivers/vulkan/vulkan_context.h

@@ -120,7 +120,6 @@ class VulkanContext {
 	uint32_t enabled_extension_count = 0;
 	const char *extension_names[MAX_EXTENSIONS];
 
-	const char **instance_validation_layers = nullptr;
 	uint32_t enabled_layer_count = 0;
 	const char *enabled_layers[MAX_LAYERS];
 

main/main.cpp

@@ -334,8 +334,8 @@ void Main::print_help(const char *p_binary) {
 	OS::get_singleton()->print("  -d, --debug                      Debug (local stdout debugger).\n");
 	OS::get_singleton()->print("  -b, --breakpoints                Breakpoint list as source::line comma-separated pairs, no spaces (use %%20 instead).\n");
 	OS::get_singleton()->print("  --profiling                      Enable profiling in the script debugger.\n");
-#if DEBUG_ENABLED
 	OS::get_singleton()->print("  --vk-layers                      Enable Vulkan Validation layers for debugging.\n");
+#if DEBUG_ENABLED
 	OS::get_singleton()->print("  --gpu-abort                      Abort on GPU errors (usually validation layer errors), may help see the problem if your system freezes.\n");
 #endif
 	OS::get_singleton()->print("  --remote-debug <uri>             Remote debug (<protocol>://<host/IP>[:<port>], e.g. tcp://127.0.0.1:6007).\n");
@@ -698,9 +698,9 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		} else if (I->get() == "-w" || I->get() == "--windowed") { // force windowed window
 
 			init_windowed = true;
-#ifdef DEBUG_ENABLED
 		} else if (I->get() == "--vk-layers") {
 			Engine::singleton->use_validation_layers = true;
+#ifdef DEBUG_ENABLED
 		} else if (I->get() == "--gpu-abort") {
 			Engine::singleton->abort_on_gpu_errors = true;
 #endif