/* Copyright (c) 2014-2018, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#pragma once

#include "vkalloc.hpp"

#include "nvvkpp/allocator_dedicated_vkpp.hpp"
#include "nvvkpp/appbase_vkpp.hpp"
#include "nvvkpp/debug_util_vkpp.hpp"

// #VKRay
#include "nvvkpp/raytraceKHR_vkpp.hpp"
#include "offscreen.hpp"

#include "obj.hpp"
#include "raytrace.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 nvvkpp::AppBase
{
public:
  void setup(const vk::Device&         device,
             const vk::PhysicalDevice& physicalDevice,
             uint32_t                  queueFamily) override;
  void createDescriptorSetLayout();
  void createGraphicsPipeline();
  void loadModel(const std::string& filename, nvmath::mat4f transform = nvmath::mat4f(1));
  void updateDescriptorSet();
  void createUniformBuffer();
  void createSceneDescriptionBuffer();
  void createTextureImages(const vk::CommandBuffer&        cmdBuf,
                           const std::vector<std::string>& textures);
  void updateUniformBuffer();
  void onResize(int /*w*/, int /*h*/) override;
  void destroyResources();
  void rasterize(const vk::CommandBuffer& cmdBuff);

  Offscreen& offscreen() { return m_offscreen; }
  Raytracer& raytracer() { return m_raytrace; }

  ObjPushConstants m_pushConstants;

  // Array of objects and instances in the scene
  std::vector<ObjModel>    m_objModel;
  std::vector<ObjInstance> m_objInstance;


  // Graphic pipeline
  vk::PipelineLayout                          m_pipelineLayout;
  vk::Pipeline                                m_graphicsPipeline;
  std::vector<vk::DescriptorSetLayoutBinding> m_descSetLayoutBind;
  vk::DescriptorPool                          m_descPool;
  vk::DescriptorSetLayout                     m_descSetLayout;
  vk::DescriptorSet                           m_descSet;

  int  m_maxFrames{10};
  void resetFrame();
  void updateFrame();

  nvvkBuffer               m_cameraMat;  // Device-Host of the camera matrices
  nvvkBuffer               m_sceneDesc;  // Device buffer of the OBJ instances
  std::vector<nvvkTexture> m_textures;   // vector of all textures of the scene

  nvvkpp::DebugUtil m_debug;  // Utility to name objects

  nvvkAllocator    m_alloc;  // Allocator for buffer, images, acceleration structures
  nvvkMemAllocator m_memAllocator;


  // #Post
  Offscreen m_offscreen;
  void      initOffscreen();


  // #VKRay
  Raytracer m_raytrace;

  void initRayTracing();
  void raytrace(const vk::CommandBuffer& cmdBuf, const nvmath::vec4f& clearColor);

  // Implicit
  ImplInst m_implObjects;

  void addImplSphere(nvmath::vec3f center, float radius, int matId);
  void addImplCube(nvmath::vec3f minumum, nvmath::vec3f maximum, int matId);
  void addImplMaterial(const MaterialObj& mat);
  void createImplictBuffers();
};