// Copyright(c) 2019, 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.
//
// VulkanHpp Samples : SecondaryCommandBuffer
//                     Draw several cubes using primary and secondary command buffers

#include "../utils/geometries.hpp"
#include "../utils/math.hpp"
#include "../utils/shaders.hpp"
#include "../utils/utils.hpp"
#include "vulkan/vulkan.hpp"
#include "SPIRV/GlslangToSpv.h"
#include <iostream>

static char const* AppName = "SecondaryCommandBuffer";
static char const* EngineName = "Vulkan.hpp";

int main(int /*argc*/, char ** /*argv*/)
{
  try
  {
    vk::UniqueInstance instance = vk::su::createInstance(AppName, EngineName, {}, vk::su::getInstanceExtensions());
#if !defined(NDEBUG)
    vk::UniqueDebugUtilsMessengerEXT debugUtilsMessenger = vk::su::createDebugUtilsMessenger(instance);
#endif

    vk::PhysicalDevice physicalDevice = instance->enumeratePhysicalDevices().front();

    vk::su::SurfaceData surfaceData(instance, AppName, AppName, vk::Extent2D(500, 500));

    std::pair<uint32_t, uint32_t> graphicsAndPresentQueueFamilyIndex = vk::su::findGraphicsAndPresentQueueFamilyIndex(physicalDevice, *surfaceData.surface);
    vk::UniqueDevice device = vk::su::createDevice(physicalDevice, graphicsAndPresentQueueFamilyIndex.first, vk::su::getDeviceExtensions());

    vk::UniqueCommandPool commandPool = vk::su::createCommandPool(device, graphicsAndPresentQueueFamilyIndex.first);
    vk::UniqueCommandBuffer commandBuffer = std::move(device->allocateCommandBuffersUnique(vk::CommandBufferAllocateInfo(commandPool.get(), vk::CommandBufferLevel::ePrimary, 1)).front());

    vk::Queue graphicsQueue = device->getQueue(graphicsAndPresentQueueFamilyIndex.first, 0);
    vk::Queue presentQueue = device->getQueue(graphicsAndPresentQueueFamilyIndex.second, 0);

    vk::su::SwapChainData swapChainData(physicalDevice, device, *surfaceData.surface, surfaceData.extent, vk::ImageUsageFlagBits::eColorAttachment | vk::ImageUsageFlagBits::eTransferSrc,
                                        vk::UniqueSwapchainKHR(), graphicsAndPresentQueueFamilyIndex.first, graphicsAndPresentQueueFamilyIndex.second);

    vk::su::DepthBufferData depthBufferData(physicalDevice, device, vk::Format::eD16Unorm, surfaceData.extent);

    vk::su::BufferData uniformBufferData(physicalDevice, device, sizeof(glm::mat4x4), vk::BufferUsageFlagBits::eUniformBuffer);
    vk::su::copyToDevice(device, uniformBufferData.deviceMemory, vk::su::createModelViewProjectionClipMatrix(surfaceData.extent));

    vk::UniqueDescriptorSetLayout descriptorSetLayout = vk::su::createDescriptorSetLayout(device,
      { {vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex}, {vk::DescriptorType::eCombinedImageSampler, 1, vk::ShaderStageFlagBits::eFragment} });
    vk::UniquePipelineLayout pipelineLayout = device->createPipelineLayoutUnique(vk::PipelineLayoutCreateInfo(vk::PipelineLayoutCreateFlags(), 1, &descriptorSetLayout.get()));

    vk::UniqueRenderPass renderPass = vk::su::createRenderPass(device, vk::su::pickSurfaceFormat(physicalDevice.getSurfaceFormatsKHR(surfaceData.surface.get())).format, depthBufferData.format,
      vk::AttachmentLoadOp::eClear, vk::ImageLayout::eColorAttachmentOptimal);

    glslang::InitializeProcess();
    vk::UniqueShaderModule vertexShaderModule = vk::su::createShaderModule(device, vk::ShaderStageFlagBits::eVertex, vertexShaderText_PT_T);
    vk::UniqueShaderModule fragmentShaderModule = vk::su::createShaderModule(device, vk::ShaderStageFlagBits::eFragment, fragmentShaderText_T_C);
    glslang::FinalizeProcess();

    std::vector<vk::UniqueFramebuffer> framebuffers = vk::su::createFramebuffers(device, renderPass, swapChainData.imageViews, depthBufferData.imageView, surfaceData.extent);

    vk::su::BufferData vertexBufferData(physicalDevice, device, sizeof(texturedCubeData), vk::BufferUsageFlagBits::eVertexBuffer);
    vk::su::copyToDevice(device, vertexBufferData.deviceMemory, texturedCubeData, sizeof(texturedCubeData) / sizeof(texturedCubeData[0]));

    vk::UniquePipelineCache pipelineCache = device->createPipelineCacheUnique(vk::PipelineCacheCreateInfo());

    vk::UniquePipeline graphicsPipeline = vk::su::createGraphicsPipeline(device, pipelineCache, std::make_pair(*vertexShaderModule, nullptr), std::make_pair(*fragmentShaderModule, nullptr),
                                                                         sizeof(texturedCubeData[0]), { { vk::Format::eR32G32B32A32Sfloat, 0 }, { vk::Format::eR32G32Sfloat, 16 } },
                                                                         vk::FrontFace::eClockwise, true, pipelineLayout, renderPass);

    commandBuffer->begin(vk::CommandBufferBeginInfo());

    vk::su::TextureData greenTextureData(physicalDevice, device);
    greenTextureData.setImage(device, commandBuffer, vk::su::MonochromeImageGenerator({ 118, 185, 0 }));

    vk::su::TextureData checkeredTextureData(physicalDevice, device);
    checkeredTextureData.setImage(device, commandBuffer, vk::su::CheckerboardImageGenerator());

    // create two identical descriptor sets, each with a different texture but identical UBOs
    vk::UniqueDescriptorPool descriptorPool = vk::su::createDescriptorPool(device, { {vk::DescriptorType::eUniformBuffer, 2}, {vk::DescriptorType::eCombinedImageSampler, 2} });

    vk::DescriptorSetLayout layouts[] = { descriptorSetLayout.get(), descriptorSetLayout.get() };
    std::vector<vk::UniqueDescriptorSet> descriptorSets = device->allocateDescriptorSetsUnique(vk::DescriptorSetAllocateInfo(descriptorPool.get(), 2, layouts));
    assert(descriptorSets.size() == 2);

    vk::su::updateDescriptorSets(device, descriptorSets[0], {{vk::DescriptorType::eUniformBuffer, uniformBufferData.buffer, vk::UniqueBufferView()}}, greenTextureData);
    vk::su::updateDescriptorSets(device, descriptorSets[1], {{vk::DescriptorType::eUniformBuffer, uniformBufferData.buffer, vk::UniqueBufferView()}}, checkeredTextureData);

    /* VULKAN_KEY_START */

    // create four secondary command buffers, for each quadrant of the screen
    std::vector<vk::UniqueCommandBuffer> secondaryCommandBuffers = device->allocateCommandBuffersUnique(vk::CommandBufferAllocateInfo(commandPool.get(), vk::CommandBufferLevel::eSecondary, 4));

    // Get the index of the next available swapchain image:
    vk::UniqueSemaphore imageAcquiredSemaphore = device->createSemaphoreUnique(vk::SemaphoreCreateInfo());
    vk::ResultValue<uint32_t> currentBuffer = device->acquireNextImageKHR(swapChainData.swapChain.get(), vk::su::FenceTimeout, imageAcquiredSemaphore.get(), nullptr);
    assert(currentBuffer.result == vk::Result::eSuccess);
    assert(currentBuffer.value < framebuffers.size());

    vk::su::setImageLayout(commandBuffer, swapChainData.images[currentBuffer.value], swapChainData.colorFormat, vk::ImageLayout::eUndefined, vk::ImageLayout::eColorAttachmentOptimal);

    const vk::DeviceSize offset = 0;
    vk::Viewport viewport(0.0f, 0.0f, 200.0f, 200.0f, 0.0f, 1.0f);
    vk::Rect2D scissor(vk::Offset2D(0, 0), vk::Extent2D(surfaceData.extent));

    // now we record four separate command buffers, one for each quadrant of the screen
    vk::CommandBufferInheritanceInfo commandBufferInheritanceInfo(renderPass.get(), 0, framebuffers[currentBuffer.value].get());
    vk::CommandBufferBeginInfo secondaryBeginInfo(vk::CommandBufferUsageFlagBits::eOneTimeSubmit | vk::CommandBufferUsageFlagBits::eRenderPassContinue, &commandBufferInheritanceInfo);

    for (int i = 0; i < 4; i++)
    {
      viewport.x = 25.0f + 250.0f * (i % 2);
      viewport.y = 25.0f + 250.0f * (i / 2);

      secondaryCommandBuffers[i]->begin(secondaryBeginInfo);
      secondaryCommandBuffers[i]->bindPipeline(vk::PipelineBindPoint::eGraphics, graphicsPipeline.get());
      secondaryCommandBuffers[i]->bindDescriptorSets(vk::PipelineBindPoint::eGraphics, pipelineLayout.get(), 0, descriptorSets[i == 0 || i == 3].get(), nullptr);
      secondaryCommandBuffers[i]->bindVertexBuffers(0, vertexBufferData.buffer.get(), offset);
      secondaryCommandBuffers[i]->setViewport(0, viewport);
      secondaryCommandBuffers[i]->setScissor(0, scissor);
      secondaryCommandBuffers[i]->draw(12 * 3, 1, 0, 0);
      secondaryCommandBuffers[i]->end();
    }


    vk::ClearValue clearValues[2];
    clearValues[0].color = vk::ClearColorValue(std::array<float, 4>({ 0.2f, 0.2f, 0.2f, 0.2f }));
    clearValues[1].depthStencil = vk::ClearDepthStencilValue(1.0f, 0);

    vk::RenderPassBeginInfo renderPassBeginInfo(renderPass.get(), framebuffers[currentBuffer.value].get(), vk::Rect2D(vk::Offset2D(0, 0), surfaceData.extent), 2, clearValues);
    // specifying VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS means this render pass may ONLY call vkCmdExecuteCommands
    commandBuffer->beginRenderPass(renderPassBeginInfo, vk::SubpassContents::eSecondaryCommandBuffers);
    commandBuffer->executeCommands(vk::uniqueToRaw(secondaryCommandBuffers));
    commandBuffer->endRenderPass();

    vk::ImageMemoryBarrier prePresentBarrier(vk::AccessFlagBits::eColorAttachmentWrite, vk::AccessFlagBits::eMemoryRead, vk::ImageLayout::eColorAttachmentOptimal, vk::ImageLayout::ePresentSrcKHR,
      VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED, swapChainData.images[currentBuffer.value], vk::ImageSubresourceRange(vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1));
    commandBuffer->pipelineBarrier(vk::PipelineStageFlagBits::eColorAttachmentOutput, vk::PipelineStageFlagBits::eBottomOfPipe, vk::DependencyFlags(), nullptr, nullptr, prePresentBarrier);
    commandBuffer->end();

    vk::UniqueFence drawFence = device->createFenceUnique(vk::FenceCreateInfo());

    vk::PipelineStageFlags waitDestinationStageMask(vk::PipelineStageFlagBits::eColorAttachmentOutput);
    vk::SubmitInfo submitInfo(1, &imageAcquiredSemaphore.get(), &waitDestinationStageMask, 1, &commandBuffer.get());
    graphicsQueue.submit(submitInfo, drawFence.get());

    while (vk::Result::eTimeout == device->waitForFences(drawFence.get(), VK_TRUE, vk::su::FenceTimeout))
      ;

    presentQueue.presentKHR(vk::PresentInfoKHR(0, nullptr, 1, &swapChainData.swapChain.get(), &currentBuffer.value));
    Sleep(1000);

    /* VULKAN_KEY_END */

    device->waitIdle();
#if defined(VK_USE_PLATFORM_WIN32_KHR)
    DestroyWindow(surfaceData.window);
#else
#pragma error "unhandled platform"
#endif
  }
  catch (vk::SystemError err)
  {
    std::cout << "vk::SystemError: " << err.what() << std::endl;
    exit(-1);
  }
  catch (std::runtime_error err)
  {
    std::cout << "std::runtime_error: " << err.what() << std::endl;
    exit(-1);
  }
  catch (...)
  {
    std::cout << "unknown error\n";
    exit(-1);
  }
  return 0;
}