Support additional VK_KHR_format_feature_flags2 format feature flags.

- VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT
- VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT
- VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_DEPTH_COMPARISON_BIT

MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm

@@ -2048,7 +2048,9 @@
 										   VK_FORMAT_FEATURE_2_TRANSFER_DST_BIT |
 										   VK_FORMAT_FEATURE_2_BLIT_SRC_BIT),
 	kMVKVkFormatFeatureFlagsTexFilter   = (VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_FILTER_LINEAR_BIT),
-	kMVKVkFormatFeatureFlagsTexWrite    = (VK_FORMAT_FEATURE_2_STORAGE_IMAGE_BIT),
+	kMVKVkFormatFeatureFlagsTexWrite    = (VK_FORMAT_FEATURE_2_STORAGE_IMAGE_BIT |
+										   VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT |
+										   VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT),
 	kMVKVkFormatFeatureFlagsTexAtomic   = (VK_FORMAT_FEATURE_2_STORAGE_IMAGE_ATOMIC_BIT),
 	kMVKVkFormatFeatureFlagsTexColorAtt = (VK_FORMAT_FEATURE_2_COLOR_ATTACHMENT_BIT |
 										   VK_FORMAT_FEATURE_2_BLIT_DST_BIT),
@@ -2106,6 +2108,10 @@
 	enableFormatFeatures(DSAtt, Tex, mtlPixFmtCaps, vkProps.optimalTilingFeatures);
 	enableFormatFeatures(Blend, Tex, mtlPixFmtCaps, vkProps.optimalTilingFeatures);
 
+	if (isDepthFormat(vkDesc.mtlPixelFormat) && mvkIsAnyFlagEnabled(vkProps.optimalTilingFeatures, VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_BIT)) {
+		vkProps.optimalTilingFeatures |= VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_DEPTH_COMPARISON_BIT;
+	}
+
 	// We would really want to use the device's Metal features instead of duplicating
 	// the logic from MVKPhysicalDevice, but those may not have been initialized yet.
 	id<MTLDevice> mtlDev = _physicalDevice ? _physicalDevice->getMTLDevice() : nil;