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+/* Copyright (c) 2019-2024, Sascha Willems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Push descriptors
+ *
+ * Note: Requires a device that supports the VK_KHR_push_descriptor extension
+ *
+ * Push descriptors apply the push constants concept to descriptor sets. So instead of creating
+ * per-model descriptor sets (along with a pool for each descriptor type) for rendering multiple objects,
+ * this example uses push descriptors to pass descriptor sets for per-model textures and matrices
+ * at command buffer creation time.
+ */
+
+#pragma once
+
+#include "api_vulkan_sample.h"
+
+class PushDescriptors : public ApiVulkanSample
+{
+  public:
+	bool animate = true;
+
+	PFN_vkCmdPushDescriptorSetKHR               vkCmdPushDescriptorSetKHR;
+	VkPhysicalDevicePushDescriptorPropertiesKHR push_descriptor_properties{};
+
+	struct Cube
+	{
+		Texture                             texture;
+		std::unique_ptr<vkb::core::BufferC> uniform_buffer;
+		glm::vec3                           rotation;
+		glm::mat4                           model_mat;
+	};
+	std::array<Cube, 2> cubes;
+
+	struct Models
+	{
+		std::unique_ptr<vkb::sg::SubMesh> cube;
+	} models;
+
+	struct UniformBuffers
+	{
+		std::unique_ptr<vkb::core::BufferC> scene;
+	} uniform_buffers;
+
+	struct UboScene
+	{
+		glm::mat4 projection;
+		glm::mat4 view;
+	} ubo_scene;
+
+	VkPipeline            pipeline;
+	VkPipelineLayout      pipeline_layout;
+	VkDescriptorSetLayout descriptor_set_layout;
+
+	PushDescriptors();
+	~PushDescriptors();
+	virtual void request_gpu_features(vkb::PhysicalDevice &gpu) override;
+	void         build_command_buffers() override;
+	void         load_assets();
+	void         setup_descriptor_set_layout();
+	void         prepare_pipelines();
+	void         prepare_uniform_buffers();
+	void         update_uniform_buffers();
+	void         update_cube_uniform_buffers(float delta_time);
+	void         draw();
+	bool         prepare(const vkb::ApplicationOptions &options) override;
+	virtual void render(float delta_time) override;
+	virtual void on_update_ui_overlay(vkb::Drawer &drawer) override;
+};
+
+std::unique_ptr<vkb::VulkanSampleC> create_push_descriptors();