dynamic_blending: fix uninitialized eds_feature_support (KhronosGroup#1485)

Capture REQUEST_OPTIONAL_FEATURE return values into eds_feature_support
so the sample correctly knows which dynamic state features are available.

Author: gary-sweet

samples/extensions/dynamic_blending/dynamic_blending.cpp

@@ -153,11 +153,15 @@ void DynamicBlending::request_gpu_features(vkb::core::PhysicalDeviceC &gpu)
 	                         VkPhysicalDeviceExtendedDynamicState3FeaturesEXT,
 	                         extendedDynamicState3ColorBlendEnable);
 
-	// Only request the features that we support
-	REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorWriteMask);
-	REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendEnable);
-	REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendAdvanced);
-	REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendEquation);
+	// Only request the features that we support, and record which ones are available
+	eds_feature_support.extendedDynamicState3ColorWriteMask =
+	    REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorWriteMask);
+	eds_feature_support.extendedDynamicState3ColorBlendEnable =
+	    REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendEnable);
+	eds_feature_support.extendedDynamicState3ColorBlendAdvanced =
+	    REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendAdvanced);
+	eds_feature_support.extendedDynamicState3ColorBlendEquation =
+	    REQUEST_OPTIONAL_FEATURE(gpu, VkPhysicalDeviceExtendedDynamicState3FeaturesEXT, extendedDynamicState3ColorBlendEquation);
 
 	REQUEST_REQUIRED_FEATURE(gpu, VkPhysicalDeviceBlendOperationAdvancedFeaturesEXT, advancedBlendCoherentOperations);
 }

samples/extensions/dynamic_blending/dynamic_blending.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2023-2025, Mobica
+/* Copyright (c) 2023-2026, Mobica
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -118,7 +118,7 @@ class DynamicBlending : public ApiVulkanSample
 	VkDescriptorSet       descriptor_set;
 	VkPipeline            pipeline;
 
-	VkPhysicalDeviceExtendedDynamicState3FeaturesEXT eds_feature_support;
+	VkPhysicalDeviceExtendedDynamicState3FeaturesEXT eds_feature_support{};
 
 	std::array<float, 4> clear_color = {0.5f, 0.5f, 0.5f, 1.0f};
 	int32_t              current_blend_color_operator_index;