/* Copyright (c) 2023-2024, Mobica Limited
 *
 * 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.
 */

#pragma once

#include "api_vulkan_sample.h"

class FragmentShaderBarycentric : public ApiVulkanSample
{
  public:
	struct
	{
		Texture envmap;
		Texture cube;
	} textures;

	struct UBOVS
	{
		glm::mat4 projection;
		glm::mat4 modelview;
	} ubo_vs;

	struct GUI_settings
	{
		int                            selected_effect = 0; /* default interpolation */
		const std::vector<std::string> effect_names    = {"Color interpolation",
		                                                  "Perspective vs non-perspective",
		                                                  "Wireframe",
		                                                  "Interpolate to mass center",
		                                                  "Barycoord texture"};
	} gui_settings;

	std::unique_ptr<vkb::sg::SubMesh> skybox;
	std::unique_ptr<vkb::sg::SubMesh> object;

	std::unique_ptr<vkb::core::BufferC> ubo;

	struct
	{
		VkPipeline object{VK_NULL_HANDLE};
		VkPipeline skybox{VK_NULL_HANDLE};
	} pipelines;

	struct
	{
		VkDescriptorSet skybox{VK_NULL_HANDLE};
		VkDescriptorSet object{VK_NULL_HANDLE};
	} descriptor_sets;

	VkPipelineLayout      pipeline_layout{VK_NULL_HANDLE};
	VkDescriptorSetLayout descriptor_set_layout{VK_NULL_HANDLE};

	FragmentShaderBarycentric();
	~FragmentShaderBarycentric() override;

	bool prepare(const vkb::ApplicationOptions &options) override;

	void render(float delta_time) override;
	void build_command_buffers() override;
	void request_gpu_features(vkb::PhysicalDevice &gpu) override;
	void on_update_ui_overlay(vkb::Drawer &drawer) override;

  private:
	void load_assets();
	void prepare_uniform_buffers();
	void update_uniform_buffers();
	void setup_descriptor_set_layout();
	void create_descriptor_sets();
	void create_descriptor_pool();
	void create_pipeline();
	void draw();
};

std::unique_ptr<vkb::VulkanSampleC> create_fragment_shader_barycentric();