// 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 : MultipleSets
//                     Use multiple descriptor sets to draw a textured cube.

#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 = "MultipleSets";
static char const* EngineName = "Vulkan.hpp";

const std::string vertexShaderText = R"(
#version 400

#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable

layout (std140, set = 0, binding = 0) uniform buffer
{
  mat4 mvp;
} uniformBuffer;

layout (set = 1, binding = 0) uniform sampler2D surface;

layout (location = 0) in vec4 pos;
layout (location = 1) in vec2 inTexCoord;

layout (location = 0) out vec4 outColor;
layout (location = 1) out vec2 outTexCoord;

void main()
{
  outColor = texture(surface, vec2(0.0f));
  outTexCoord = inTexCoord;
  gl_Position = uniformBuffer.mvp * pos;
}
)";

const char *fragShaderText =
"#version 400\n"
"#extension GL_ARB_separate_shader_objects : enable\n"
"#extension GL_ARB_shading_language_420pack : enable\n"
"layout (location = 0) in vec4 inColor;\n"
"layout (location = 1) in vec2 inTexCoords;\n"
"layout (location = 0) out vec4 outColor;\n"
"void main() {\n"
"    vec4 resColor = inColor;\n"
// Create a border to see the cube more easily
"   if (inTexCoords.x < 0.01 || inTexCoords.x > 0.99)\n"
"       resColor *= vec4(0.1, 0.1, 0.1, 1.0);\n"
"   if (inTexCoords.y < 0.01 || inTexCoords.y > 0.99)\n"
"       resColor *= vec4(0.1, 0.1, 0.1, 1.0);\n"
"   outColor = resColor;\n"
"}\n";

const std::string fragmentShaderText = R"(
#version 400

#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable

layout (location = 0) in vec4 inColor;
layout (location = 1) in vec2 inTexCoord;

layout (location = 0) out vec4 outColor;

void main()
{
  outColor = inColor;

  // create a border to see the cube more easily
  if ((inTexCoord.x < 0.01f) || (0.99f < inTexCoord.x) || (inTexCoord.y < 0.01f) || (0.99f < inTexCoord.y))
  {
    outColor *= vec4(0.1f, 0.1f, 0.1f, 1.0f);
  }
}
)";

class MonochromeTextureGenerator
{
public:
  MonochromeTextureGenerator(std::array<unsigned char, 3> const& rgb_)
    : rgb(rgb_)
  {}

  void operator()(void* data, vk::Extent2D &extent) const
  {
    // fill in with the monochrome color
    unsigned char *pImageMemory = static_cast<unsigned char*>(data);
    for (uint32_t row = 0; row < extent.height; row++)
    {
      for (uint32_t col = 0; col < extent.width; col++)
      {
        pImageMemory[0] = rgb[0];
        pImageMemory[1] = rgb[1];
        pImageMemory[2] = rgb[2];
        pImageMemory[3] = 255;
        pImageMemory += 4;
      }
    }
  }

private:
  std::array<unsigned char, 3> const& rgb;
};

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

    std::vector<vk::PhysicalDevice> physicalDevices = instance->enumeratePhysicalDevices();
    assert(!physicalDevices.empty());

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

    std::pair<uint32_t, uint32_t> graphicsAndPresentQueueFamilyIndex = vk::su::findGraphicsAndPresentQueueFamilyIndex(physicalDevices[0], surfaceData.surface);
    vk::UniqueDevice device = vk::su::createDevice(physicalDevices[0], graphicsAndPresentQueueFamilyIndex.first, vk::su::getDeviceExtensions());

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

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

    vk::su::SwapChainData swapChainData(physicalDevices[0], device, surfaceData.surface, surfaceData.extent, vk::ImageUsageFlagBits::eColorAttachment | vk::ImageUsageFlagBits::eTransferSrc
      , graphicsAndPresentQueueFamilyIndex.first, graphicsAndPresentQueueFamilyIndex.second);

    vk::su::DepthBufferData depthBufferData(physicalDevices[0], device, vk::Format::eD16Unorm, surfaceData.extent);

    vk::su::TextureData textureData(physicalDevices[0], device);

    commandBuffers[0]->begin(vk::CommandBufferBeginInfo());
    textureData.setTexture(device, commandBuffers[0], MonochromeTextureGenerator({ 118, 185, 0 }));

    vk::su::BufferData uniformBufferData(physicalDevices[0], device, sizeof(glm::mat4x4), vk::BufferUsageFlagBits::eUniformBuffer);
    vk::su::copyToDevice(device, uniformBufferData.deviceMemory, vk::su::createModelViewProjectionClipMatrix(surfaceData.extent));

    vk::UniqueRenderPass renderPass = vk::su::createRenderPass(device, vk::su::pickColorFormat(physicalDevices[0].getSurfaceFormatsKHR(surfaceData.surface.get())), depthBufferData.format);

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

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

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

    /* VULKAN_KEY_START */

    // Create first layout to contain uniform buffer data
    vk::DescriptorSetLayoutBinding uniformBinding(0, vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex);
    vk::UniqueDescriptorSetLayout uniformLayout = device->createDescriptorSetLayoutUnique(vk::DescriptorSetLayoutCreateInfo(vk::DescriptorSetLayoutCreateFlags(), 1, &uniformBinding));

    // Create second layout containing combined sampler/image data
    vk::DescriptorSetLayoutBinding sampler2DBinding(0, vk::DescriptorType::eCombinedImageSampler, 1, vk::ShaderStageFlagBits::eVertex);
    vk::UniqueDescriptorSetLayout samplerLayout = device->createDescriptorSetLayoutUnique(vk::DescriptorSetLayoutCreateInfo(vk::DescriptorSetLayoutCreateFlags(), 1, &sampler2DBinding));

    // Create pipeline layout with multiple descriptor sets
    std::array<vk::DescriptorSetLayout, 2> descriptorSetLayouts = { uniformLayout.get(), samplerLayout.get() };
    vk::UniquePipelineLayout pipelineLayout = device->createPipelineLayoutUnique(vk::PipelineLayoutCreateInfo(vk::PipelineLayoutCreateFlags(), 2, descriptorSetLayouts.data()));

    // Create a single pool to contain data for our two descriptor sets
    vk::DescriptorPoolSize poolSizes[2] =
    {
      vk::DescriptorPoolSize(vk::DescriptorType::eUniformBuffer, 1),
      vk::DescriptorPoolSize(vk::DescriptorType::eCombinedImageSampler, 1)
    };
    vk::UniqueDescriptorPool descriptorPool = device->createDescriptorPoolUnique(vk::DescriptorPoolCreateInfo(vk::DescriptorPoolCreateFlagBits::eFreeDescriptorSet, 2, 2, poolSizes));

    // Populate descriptor sets
    std::vector<vk::UniqueDescriptorSet> descriptorSets = device->allocateDescriptorSetsUnique(vk::DescriptorSetAllocateInfo(descriptorPool.get(), 2, descriptorSetLayouts.data()));

    // Populate with info about our uniform buffer
    vk::DescriptorBufferInfo uniformBufferInfo(uniformBufferData.buffer.get(), 0, sizeof(glm::mat4x4));
    vk::DescriptorImageInfo textureImageInfo(textureData.textureSampler.get(), textureData.imageData->imageView.get(), vk::ImageLayout::eShaderReadOnlyOptimal);
    std::array<vk::WriteDescriptorSet, 2> writeDescriptorSets =
    {
      vk::WriteDescriptorSet(descriptorSets[0].get(), 0, 0, 1, vk::DescriptorType::eUniformBuffer, nullptr, &uniformBufferInfo),
      vk::WriteDescriptorSet(descriptorSets[1].get(), 0, 0, 1, vk::DescriptorType::eCombinedImageSampler, &textureImageInfo)
    };
    device->updateDescriptorSets(writeDescriptorSets, nullptr);

    /* VULKAN_KEY_END */

    vk::UniquePipelineCache pipelineCache = device->createPipelineCacheUnique(vk::PipelineCacheCreateInfo());
    vk::UniquePipeline graphicsPipeline = vk::su::createGraphicsPipeline(device, pipelineCache, vertexShaderModule, fragmentShaderModule, sizeof(texturedCubeData[0]), true, pipelineLayout, renderPass);

    // 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::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);
    commandBuffers[0]->beginRenderPass(renderPassBeginInfo, vk::SubpassContents::eInline);
    commandBuffers[0]->bindPipeline(vk::PipelineBindPoint::eGraphics, graphicsPipeline.get());
    commandBuffers[0]->bindDescriptorSets(vk::PipelineBindPoint::eGraphics, pipelineLayout.get(), 0, { descriptorSets[0].get(), descriptorSets[1].get() }, nullptr);

    vk::DeviceSize offset = 0;
    commandBuffers[0]->bindVertexBuffers(0, vertexBufferData.buffer.get(), offset);

    vk::Viewport viewport(0.0f, 0.0f, static_cast<float>(surfaceData.extent.width), static_cast<float>(surfaceData.extent.height), 0.0f, 1.0f);
    commandBuffers[0]->setViewport(0, viewport);

    vk::Rect2D scissor(vk::Offset2D(0, 0), surfaceData.extent);
    commandBuffers[0]->setScissor(0, scissor);

    commandBuffers[0]->draw(12 * 3, 1, 0, 0);
    commandBuffers[0]->endRenderPass();
    commandBuffers[0]->end();

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

    vk::PipelineStageFlags waitDestinationStageMask(vk::PipelineStageFlagBits::eColorAttachmentOutput);
    vk::SubmitInfo submitInfo(1, &imageAcquiredSemaphore.get(), &waitDestinationStageMask, 1, &commandBuffers[0].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);

    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;
}