Temporary workaround for PlatformMetal

Author: bejado

filament/backend/include/backend/Platform.h

@@ -149,6 +149,13 @@ class UTILS_PUBLIC Platform {
          *      - PlatformEGLAndroid
          */
         bool assertNativeWindowIsValid = false;
+
+        /**
+         * The action to take if a Drawable cannot be acquired. If true, the
+         * frame is aborted instead of panic. This is only supported for:
+         *      - PlatformMetal
+         */
+        bool metalDisablePanicOnDrawableFailure = false;
     };
 
     Platform() noexcept;

filament/backend/src/metal/PlatformMetal.mm

@@ -53,6 +53,9 @@
 }
 
 Driver* PlatformMetal::createDriver(void* /*sharedContext*/, const Platform::DriverConfig& driverConfig) noexcept {
+    pImpl->mDrawableFailureBehavior = driverConfig.metalDisablePanicOnDrawableFailure
+            ? DrawableFailureBehavior::ABORT_FRAME
+            : DrawableFailureBehavior::PANIC;
     return MetalDriverFactory::create(this, driverConfig);
 }
 

filament/include/filament/Engine.h

@@ -317,6 +317,15 @@ class UTILS_PUBLIC Engine {
          */
         size_t metalUploadBufferSizeBytes = 512 * 1024;
 
+        /**
+         * The action to take if a Drawable cannot be acquired.
+         *
+         * Each frame rendered requires a CAMetalDrawable texture, which is
+         * presented on-screen at the completion of each frame. These are
+         * limited and provided round-robin style by the system.
+         */
+        bool metalDisablePanicOnDrawableFailure = false;
+
         /**
          * Set to `true` to forcibly disable parallel shader compilation in the backend.
          * Currently only honored by the GL and Metal backends.

filament/src/details/Engine.cpp

@@ -140,6 +140,7 @@ Engine* FEngine::create(Builder const& builder) {
                 .forceGLES2Context = instance->getConfig().forceGLES2Context,
                 .stereoscopicType = instance->getConfig().stereoscopicType,
                 .assertNativeWindowIsValid = instance->features.backend.opengl.assert_native_window_is_valid,
+                .metalDisablePanicOnDrawableFailure = instance->getConfig().metalDisablePanicOnDrawableFailure,
         };
         instance->mDriver = platform->createDriver(sharedContext, driverConfig);
 
@@ -759,6 +760,7 @@ int FEngine::loop() {
             .forceGLES2Context = mConfig.forceGLES2Context,
             .stereoscopicType =  mConfig.stereoscopicType,
             .assertNativeWindowIsValid = features.backend.opengl.assert_native_window_is_valid,
+            .metalDisablePanicOnDrawableFailure = mConfig.metalDisablePanicOnDrawableFailure,
     };
     mDriver = mPlatform->createDriver(mSharedGLContext, driverConfig);