Vulkan: Make validation layers optional

They're now disabled by default, and can be enabled with the command line
argument `--vk-layers`.

When enabled, the errors about them being missing are now warnings, as
users were confused and thought this meant Vulkan is broken for them.

Fix crash in `~VulkanContext` when validation layers are disabled (exposed by
this PR since before they could not be disabled without source modification).

Also moved VulkanContext member initializations to header.

Fixes #37102.

1 files changed, 8 insertions, 4 deletions

diff --git a/core/engine.cpp b/core/engine.cpp
index d08cf92ecb..b0037ffb37 100644
--- a/core/engine.cpp
+++ b/core/engine.cpp
@@ -181,6 +181,14 @@ String Engine::get_license_text() const {
 	return String(GODOT_LICENSE_TEXT);
 }
 
+bool Engine::is_abort_on_gpu_errors_enabled() const {
+	return abort_on_gpu_errors;
+}
+
+bool Engine::is_validation_layers_enabled() const {
+	return use_validation_layers;
+}
+
 void Engine::add_singleton(const Singleton &p_singleton) {
 	singletons.push_back(p_singleton);
 	singleton_ptrs[p_singleton.name] = p_singleton.ptr;
@@ -208,10 +216,6 @@ Engine *Engine::get_singleton() {
 	return singleton;
 }
 
-bool Engine::is_abort_on_gpu_errors_enabled() const {
-	return abort_on_gpu_errors;
-}
-
 Engine::Engine() {
 	singleton = this;
 }