/*
 * Copyright (c) 2014-2021, NVIDIA CORPORATION.  All rights reserved.
 *
 * 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.
 *
 * SPDX-FileCopyrightText: Copyright (c) 2014-2021 NVIDIA CORPORATION
 * SPDX-License-Identifier: Apache-2.0
 */

#pragma once

#include "shaders/host_device.h"

#include "nvvkhl/appbase_vk.hpp"
#include "nvvk/debug_util_vk.hpp"
#include "nvvk/descriptorsets_vk.hpp"
#include "nvvk/memallocator_dma_vk.hpp"
#include "nvvk/resourceallocator_vk.hpp"

// #VKRay
#include "nvh/gltfscene.hpp"
#include "nvvk/raytraceKHR_vk.hpp"
#include "nvvk/sbtwrapper_vk.hpp"

//--------------------------------------------------------------------------------------------------
// Simple rasterizer of OBJ objects
// - Each OBJ loaded are stored in an `ObjModel` and referenced by a `ObjInstance`
// - It is possible to have many `ObjInstance` referencing the same `ObjModel`
// - Rendering is done in an offscreen framebuffer
// - The image of the framebuffer is displayed in post-process in a full-screen quad
//
class HelloVulkan : public nvvkhl::AppBaseVk
{
public:
  void setup(const VkInstance& instance, const VkDevice& device, const VkPhysicalDevice& physicalDevice, uint32_t queueFamily) override;
  void createDescriptorSetLayout();
  void createGraphicsPipeline();
  void loadScene(const std::string& filename, const std::string &pointset_path);
  void updateDescriptorSet();
  void createUniformBuffer();
  void createTextureImages(const VkCommandBuffer& cmdBuf, tinygltf::Model& gltfModel);
  void createPointsetImage(const VkCommandBuffer& cmdBuf, const std::string &pointset_image);
  void updateUniformBuffer(const VkCommandBuffer& cmdBuf);
  void onResize(int /*w*/, int /*h*/) override;
  void destroyResources();
  void rasterize(const VkCommandBuffer& cmdBuff);


  nvh::GltfScene m_gltfScene;
  nvvk::Buffer   m_vertexBuffer;
  nvvk::Buffer   m_normalBuffer;
  nvvk::Buffer   m_uvBuffer;
  nvvk::Buffer   m_indexBuffer;
  nvvk::Buffer   m_materialBuffer;
  nvvk::Buffer   m_primInfo;
  nvvk::Buffer   m_sceneDesc;
  nvvk::Buffer   m_pointsetBuffer;

  // Information pushed at each draw call
  PushConstantRaster m_pcRaster{
      {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1},  // Identity matrix
      {0.f, 1.f, 0.f},                                 // light position
      0,                                                 // instance Id
      1.f,                                            // light intensity
      1,                                                 // light type
      0                                                  // material id
  };

  // Graphic pipeline
  VkPipelineLayout            m_pipelineLayout;
  VkPipeline                  m_graphicsPipeline;
  nvvk::DescriptorSetBindings m_descSetLayoutBind;
  VkDescriptorPool            m_descPool;
  VkDescriptorSetLayout       m_descSetLayout;
  VkDescriptorSet             m_descSet;

  nvvk::Buffer               m_bGlobals;  // Device-Host of the camera matrices
  std::vector<nvvk::Texture> m_textures;  // vector of all textures of the scene

  nvvk::ResourceAllocatorDma m_alloc;  // Allocator for buffer, images, acceleration structures
  nvvk::DebugUtil            m_debug;  // Utility to name objects


  // #Post - Draw the rendered image on a quad using a tonemapper
  void createOffscreenRender();
  void createPostPipeline();
  void createPostDescriptor();
  void updatePostDescriptorSet();
  void drawPost(VkCommandBuffer cmdBuf);

  nvvk::DescriptorSetBindings m_postDescSetLayoutBind;
  VkDescriptorPool            m_postDescPool{VK_NULL_HANDLE};
  VkDescriptorSetLayout       m_postDescSetLayout{VK_NULL_HANDLE};
  VkDescriptorSet             m_postDescSet{VK_NULL_HANDLE};
  VkPipeline                  m_postPipeline{VK_NULL_HANDLE};
  VkPipelineLayout            m_postPipelineLayout{VK_NULL_HANDLE};
  VkRenderPass                m_offscreenRenderPass{VK_NULL_HANDLE};
  VkFramebuffer               m_offscreenFramebuffer{VK_NULL_HANDLE};
  nvvk::Texture               m_offscreenColor;
  nvvk::Texture               m_offscreenDepth;
  VkFormat                    m_offscreenColorFormat{VK_FORMAT_R32G32B32A32_SFLOAT};
  VkFormat                    m_offscreenDepthFormat{VK_FORMAT_X8_D24_UNORM_PACK32};

  // #VKRay
  void initRayTracing();
  auto primitiveToVkGeometry(const nvh::GltfPrimMesh& prim);
  void createBottomLevelAS();
  void createTopLevelAS();
  void createRtDescriptorSet();
  void updateRtDescriptorSet();
  void createRtPipeline();
  void raytrace(const VkCommandBuffer& cmdBuf, const glm::vec4& clearColor);
  void updateFrame();
  void resetFrame();

  VkPhysicalDeviceRayTracingPipelinePropertiesKHR m_rtProperties{VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PIPELINE_PROPERTIES_KHR};
  nvvk::RaytracingBuilderKHR                        m_rtBuilder;
  nvvk::DescriptorSetBindings                       m_rtDescSetLayoutBind;
  VkDescriptorPool                                  m_rtDescPool;
  VkDescriptorSetLayout                             m_rtDescSetLayout;
  VkDescriptorSet                                   m_rtDescSet;
  std::vector<VkRayTracingShaderGroupCreateInfoKHR> m_rtShaderGroups;
  VkPipelineLayout                                  m_rtPipelineLayout;
  VkPipeline                                        m_rtPipeline;
  nvvk::SBTWrapper                                  m_sbtWrapper;

  PushConstantRay m_pcRay{};
};