From 0b18caf4ffeec091d75efcb83362c8d81c5f6a9e Mon Sep 17 00:00:00 2001
From: Nick Fisher <nick.fisher@avinium.com>
Date: Tue, 1 Jul 2025 10:07:10 +0800
Subject: [PATCH] expose Engine->getSupportedFeatureLevel()

---
 .../lib/src/filament/src/interface/engine.dart   | 12 +++++++++++-
 .../native/include/c_api/APIBoundaryTypes.h      |  8 ++++++++
 thermion_dart/native/include/c_api/TEngine.h     |  2 ++
 thermion_dart/native/src/c_api/TEngine.cpp       | 16 ++++++++++++++++
 4 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/thermion_dart/lib/src/filament/src/interface/engine.dart b/thermion_dart/lib/src/filament/src/interface/engine.dart
index 396cd016..563655c2 100644
--- a/thermion_dart/lib/src/filament/src/interface/engine.dart
+++ b/thermion_dart/lib/src/filament/src/interface/engine.dart
@@ -25,4 +25,14 @@ enum Backend {
         4 => NOOP,
         _ => throw ArgumentError("Unknown value for TBackend: $value"),
       };
-}
\ No newline at end of file
+}
+
+enum FeatureLevel {
+  FeatureLevel0(0),
+  FeatureLevel1(1),
+  FeatureLevel2(2),
+  FeatureLevel3(3);
+
+  final int value;
+  const FeatureLevel(this.value);
+}
diff --git a/thermion_dart/native/include/c_api/APIBoundaryTypes.h b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
index f3cd9909..70e91863 100644
--- a/thermion_dart/native/include/c_api/APIBoundaryTypes.h
+++ b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
@@ -100,6 +100,14 @@ extern "C"
 	};
 	typedef enum TGizmoType TGizmoType;
 
+	enum TFeatureLevel {
+		FEATURE_LEVEL_0 = 0,
+		FEATURE_LEVEL_1 = 1,
+		FEATURE_LEVEL_2 = 2,
+		FEATURE_LEVEL_3 = 3
+	};
+	typedef enum TFeatureLevel TFeatureLevel;
+
 	enum TPrimitiveType {
 		// don't change the enums values (made to match GL)
 		PRIMITIVETYPE_POINTS         = 0,    //!< points
diff --git a/thermion_dart/native/include/c_api/TEngine.h b/thermion_dart/native/include/c_api/TEngine.h
index 00b3d827..a9f82765 100644
--- a/thermion_dart/native/include/c_api/TEngine.h
+++ b/thermion_dart/native/include/c_api/TEngine.h
@@ -28,6 +28,8 @@ EMSCRIPTEN_KEEPALIVE TEngine *Engine_create(
     bool disableHandleUseAfterFreeCheck
 );
 
+EMSCRIPTEN_KEEPALIVE TFeatureLevel Engine_getSupportedFeatureLevel(TEngine *tEngine);
+
 EMSCRIPTEN_KEEPALIVE void Engine_destroy(TEngine *tEngine);
 EMSCRIPTEN_KEEPALIVE TRenderer *Engine_createRenderer(TEngine *tEngine);
 EMSCRIPTEN_KEEPALIVE TSwapChain *Engine_createSwapChain(TEngine *tEngine, void *window, uint64_t flags);
diff --git a/thermion_dart/native/src/c_api/TEngine.cpp b/thermion_dart/native/src/c_api/TEngine.cpp
index e54e4898..42314cb9 100644
--- a/thermion_dart/native/src/c_api/TEngine.cpp
+++ b/thermion_dart/native/src/c_api/TEngine.cpp
@@ -7,6 +7,7 @@
 #include "c_api/TEngine.h"
 
 #include <filament/Camera.h>
+#include <filament/backend/DriverEnums.h>
 #include <filament/Engine.h>
 #include <filament/Fence.h>
 #include <filament/IndirectLight.h>
@@ -74,6 +75,21 @@ namespace thermion
             return reinterpret_cast<TEngine *>(engine);
         }
 
+        EMSCRIPTEN_KEEPALIVE TFeatureLevel Engine_getSupportedFeatureLevel(TEngine *tEngine) {
+            auto *engine = reinterpret_cast<Engine *>(tEngine);
+            auto featureLevel = engine->getSupportedFeatureLevel();
+            switch(featureLevel) {
+                case filament::backend::FeatureLevel::FEATURE_LEVEL_0:
+                    return FEATURE_LEVEL_0;
+                case filament::backend::FeatureLevel::FEATURE_LEVEL_1:
+                    return FEATURE_LEVEL_1;
+                case filament::backend::FeatureLevel::FEATURE_LEVEL_2:
+                    return FEATURE_LEVEL_2;
+                case filament::backend::FeatureLevel::FEATURE_LEVEL_3:
+                    return FEATURE_LEVEL_3;
+            }
+        }
+
         EMSCRIPTEN_KEEPALIVE void Engine_destroy(TEngine *tEngine) {
             auto *engine = reinterpret_cast<Engine *>(tEngine);
             Engine::destroy(engine);