/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2018 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#include "xenia/gpu/d3d12/d3d12_command_processor.h"

#include <algorithm>
#include <cstring>

#include "xenia/base/assert.h"
#include "xenia/base/logging.h"
#include "xenia/base/math.h"
#include "xenia/base/profiling.h"
#include "xenia/gpu/d3d12/d3d12_shader.h"
#include "xenia/gpu/xenos.h"

namespace xe {
namespace gpu {
namespace d3d12 {

D3D12CommandProcessor::D3D12CommandProcessor(
    D3D12GraphicsSystem* graphics_system, kernel::KernelState* kernel_state)
    : CommandProcessor(graphics_system, kernel_state) {}
D3D12CommandProcessor::~D3D12CommandProcessor() = default;

void D3D12CommandProcessor::ClearCaches() {
  CommandProcessor::ClearCaches();
  cache_clear_requested_ = true;
}

ID3D12RootSignature* D3D12CommandProcessor::GetRootSignature(
    const D3D12Shader* vertex_shader, const D3D12Shader* pixel_shader) {
  assert_true(vertex_shader->is_translated());
  assert_true(pixel_shader == nullptr || pixel_shader->is_translated());

  uint32_t pixel_textures =
      pixel_shader != nullptr ? pixel_shader->GetTextureSRVCount() : 0;
  uint32_t pixel_samplers =
      pixel_shader != nullptr ? pixel_shader->GetSamplerCount() : 0;
  uint32_t vertex_textures = vertex_shader->GetTextureSRVCount();
  uint32_t vertex_samplers = vertex_shader->GetSamplerCount();
  // Max 96 textures (if all kinds of tfetch instructions are used for all fetch
  // registers) and 32 samplers (one sampler per used fetch), but different
  // shader stages have different texture sets.
  uint32_t index = pixel_textures | (pixel_samplers << 7) |
                   (vertex_textures << 12) | (vertex_samplers << 19);

  // Try an existing root signature.
  auto it = root_signatures_.find(index);
  if (it != root_signatures_.end()) {
    return it->second;
  }

  // Create a new one.
  D3D12_ROOT_SIGNATURE_DESC desc;
  D3D12_ROOT_PARAMETER parameters[kRootParameter_Count_TwoStageTextures];
  D3D12_DESCRIPTOR_RANGE ranges[kRootParameter_Count_TwoStageTextures];
  desc.NumParameters = kRootParameter_Count_NoTextures;
  desc.pParameters = parameters;
  desc.NumStaticSamplers = 0;
  desc.pStaticSamplers = nullptr;
  desc.Flags = D3D12_ROOT_SIGNATURE_FLAG_NONE;

  // Fetch constants.
  {
    auto& parameter = parameters[kRootParameter_FetchConstants];
    auto& range = ranges[kRootParameter_FetchConstants];
    parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
    parameter.DescriptorTable.NumDescriptorRanges = 1;
    parameter.DescriptorTable.pDescriptorRanges = &range;
    parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
    range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_CBV;
    range.NumDescriptors = 1;
    range.BaseShaderRegister = 10;
    range.RegisterSpace = 0;
    range.OffsetInDescriptorsFromTableStart = 0;
  }

  // Vertex float constants.
  {
    auto& parameter = parameters[kRootParameter_VertexFloatConstants];
    auto& range = ranges[kRootParameter_VertexFloatConstants];
    parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
    parameter.DescriptorTable.NumDescriptorRanges = 1;
    parameter.DescriptorTable.pDescriptorRanges = &range;
    parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
    range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_CBV;
    range.NumDescriptors = 8;
    range.BaseShaderRegister = 2;
    range.RegisterSpace = 0;
    range.OffsetInDescriptorsFromTableStart = 0;
  }

  // Pixel float constants.
  {
    auto& parameter = parameters[kRootParameter_PixelFloatConstants];
    auto& range = ranges[kRootParameter_PixelFloatConstants];
    parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
    parameter.DescriptorTable.NumDescriptorRanges = 1;
    parameter.DescriptorTable.pDescriptorRanges = &range;
    parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
    range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_CBV;
    range.NumDescriptors = 8;
    range.BaseShaderRegister = 2;
    range.RegisterSpace = 0;
    range.OffsetInDescriptorsFromTableStart = 0;
  }

  // Common constants - system and loop/bool.
  {
    auto& parameter = parameters[kRootParameter_CommonConstants];
    auto& range = ranges[kRootParameter_CommonConstants];
    parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
    parameter.DescriptorTable.NumDescriptorRanges = 1;
    parameter.DescriptorTable.pDescriptorRanges = &range;
    parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
    range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_CBV;
    range.NumDescriptors = 2;
    range.BaseShaderRegister = 0;
    range.RegisterSpace = 0;
    range.OffsetInDescriptorsFromTableStart = 0;
  }

  // Shared memory.
  {
    auto& parameter = parameters[kRootParameter_SharedMemory];
    auto& range = ranges[kRootParameter_SharedMemory];
    parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
    parameter.DescriptorTable.NumDescriptorRanges = 1;
    parameter.DescriptorTable.pDescriptorRanges = &range;
    parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
    range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SRV;
    range.NumDescriptors = 1;
    range.BaseShaderRegister = 0;
    range.RegisterSpace = 1;
    range.OffsetInDescriptorsFromTableStart = 0;
  }

  if (pixel_textures > 0 || vertex_textures > 0) {
    desc.NumParameters = kRootParameter_Count_OneStageTextures;

    // Pixel or vertex textures.
    {
      auto& parameter = parameters[kRootParameter_PixelOrVertexTextures];
      auto& range = ranges[kRootParameter_PixelOrVertexTextures];
      parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
      parameter.DescriptorTable.NumDescriptorRanges = 1;
      parameter.DescriptorTable.pDescriptorRanges = &range;
      range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SRV;
      range.BaseShaderRegister = 0;
      range.RegisterSpace = 0;
      range.OffsetInDescriptorsFromTableStart = 0;
      if (pixel_textures > 0) {
        assert_true(pixel_samplers > 0);
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
        range.NumDescriptors = pixel_textures;
      } else {
        assert_true(vertex_samplers > 0);
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
        range.NumDescriptors = vertex_textures;
      }
    }

    // Pixel or vertex samplers.
    {
      auto& parameter = parameters[kRootParameter_PixelOrVertexSamplers];
      auto& range = ranges[kRootParameter_PixelOrVertexSamplers];
      parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
      parameter.DescriptorTable.NumDescriptorRanges = 1;
      parameter.DescriptorTable.pDescriptorRanges = &range;
      range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SAMPLER;
      range.BaseShaderRegister = 0;
      range.RegisterSpace = 0;
      range.OffsetInDescriptorsFromTableStart = 0;
      if (pixel_samplers > 0) {
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
        range.NumDescriptors = pixel_samplers;
      } else {
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
        range.NumDescriptors = vertex_samplers;
      }
    }

    if (pixel_textures > 0 && vertex_textures > 0) {
      assert_true(vertex_samplers > 0);

      desc.NumParameters = kRootParameter_Count_TwoStageTextures;

      // Vertex textures.
      {
        auto& parameter = parameters[kRootParameter_VertexTextures];
        auto& range = ranges[kRootParameter_VertexTextures];
        parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
        parameter.DescriptorTable.NumDescriptorRanges = 1;
        parameter.DescriptorTable.pDescriptorRanges = &range;
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
        range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SRV;
        range.NumDescriptors = vertex_textures;
        range.BaseShaderRegister = 0;
        range.RegisterSpace = 0;
        range.OffsetInDescriptorsFromTableStart = 0;
      }

      // Vertex samplers.
      {
        auto& parameter = parameters[kRootParameter_VertexSamplers];
        auto& range = ranges[kRootParameter_VertexSamplers];
        parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
        parameter.DescriptorTable.NumDescriptorRanges = 1;
        parameter.DescriptorTable.pDescriptorRanges = &range;
        parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX;
        range.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SAMPLER;
        range.NumDescriptors = vertex_samplers;
        range.BaseShaderRegister = 0;
        range.RegisterSpace = 0;
        range.OffsetInDescriptorsFromTableStart = 0;
      }
    }
  }

  ID3DBlob* blob;
  ID3DBlob* error_blob = nullptr;
  if (FAILED(D3D12SerializeRootSignature(&desc, D3D_ROOT_SIGNATURE_VERSION_1,
                                         &blob, &error_blob))) {
    XELOGE(
        "Failed to serialize a root signature with %u pixel textures, %u "
        "pixel samplers, %u vertex textures and %u vertex samplers",
        pixel_textures, pixel_samplers, vertex_textures, vertex_samplers);
    if (error_blob != nullptr) {
      XELOGE("%s",
             reinterpret_cast<const char*>(error_blob->GetBufferPointer()));
      error_blob->Release();
    }
    return nullptr;
  }
  if (error_blob != nullptr) {
    error_blob->Release();
  }

  auto device = GetD3D12Context()->GetD3D12Provider()->GetDevice();
  ID3D12RootSignature* root_signature;
  if (FAILED(device->CreateRootSignature(0, blob->GetBufferPointer(),
                                         blob->GetBufferSize(),
                                         IID_PPV_ARGS(&root_signature)))) {
    XELOGE(
        "Failed to create a root signature with %u pixel textures, %u pixel "
        "samplers, %u vertex textures and %u vertex samplers",
        pixel_textures, pixel_samplers, vertex_textures, vertex_samplers);
    blob->Release();
    return nullptr;
  }
  blob->Release();

  root_signatures_.insert({index, root_signature});
  return root_signature;
}

uint64_t D3D12CommandProcessor::RequestViewDescriptors(
    uint64_t previous_full_update, uint32_t count_for_partial_update,
    uint32_t count_for_full_update, D3D12_CPU_DESCRIPTOR_HANDLE& cpu_handle_out,
    D3D12_GPU_DESCRIPTOR_HANDLE& gpu_handle_out) {
  uint32_t descriptor_index;
  uint64_t current_full_update =
      view_heap_pool_->Request(previous_full_update, count_for_partial_update,
                               count_for_full_update, descriptor_index);
  if (current_full_update == 0) {
    // There was an error.
    return 0;
  }
  ID3D12DescriptorHeap* heap = view_heap_pool_->GetLastRequestHeap();
  if (current_view_heap_ != heap) {
    // Bind the new descriptor heaps if needed.
    current_view_heap_ = heap;
    ID3D12DescriptorHeap* heaps[2];
    uint32_t heap_count = 0;
    heaps[heap_count++] = heap;
    if (current_sampler_heap_ != nullptr) {
      heaps[heap_count++] = current_sampler_heap_;
    }
    command_lists_[current_queue_frame_]->GetCommandList()->SetDescriptorHeaps(
        heap_count, heaps);
  }
  uint32_t descriptor_offset =
      descriptor_index *
      GetD3D12Context()->GetD3D12Provider()->GetDescriptorSizeView();
  cpu_handle_out.ptr =
      view_heap_pool_->GetLastRequestHeapCPUStart().ptr + descriptor_offset;
  gpu_handle_out.ptr =
      view_heap_pool_->GetLastRequestHeapGPUStart().ptr + descriptor_offset;
  return current_full_update;
}

uint64_t D3D12CommandProcessor::RequestSamplerDescriptors(
    uint64_t previous_full_update, uint32_t count_for_partial_update,
    uint32_t count_for_full_update, D3D12_CPU_DESCRIPTOR_HANDLE& cpu_handle_out,
    D3D12_GPU_DESCRIPTOR_HANDLE& gpu_handle_out) {
  uint32_t descriptor_index;
  uint64_t current_full_update = sampler_heap_pool_->Request(
      previous_full_update, count_for_partial_update, count_for_full_update,
      descriptor_index);
  if (current_full_update == 0) {
    // There was an error.
    return 0;
  }
  ID3D12DescriptorHeap* heap = sampler_heap_pool_->GetLastRequestHeap();
  if (current_sampler_heap_ != heap) {
    // Bind the new descriptor heaps if needed.
    current_sampler_heap_ = heap;
    ID3D12DescriptorHeap* heaps[2];
    uint32_t heap_count = 0;
    heaps[heap_count++] = heap;
    if (current_view_heap_ != nullptr) {
      heaps[heap_count++] = current_view_heap_;
    }
    command_lists_[current_queue_frame_]->GetCommandList()->SetDescriptorHeaps(
        heap_count, heaps);
  }
  uint32_t descriptor_offset =
      descriptor_index *
      GetD3D12Context()->GetD3D12Provider()->GetDescriptorSizeSampler();
  cpu_handle_out.ptr =
      view_heap_pool_->GetLastRequestHeapCPUStart().ptr + descriptor_offset;
  gpu_handle_out.ptr =
      view_heap_pool_->GetLastRequestHeapGPUStart().ptr + descriptor_offset;
  return current_full_update;
}

bool D3D12CommandProcessor::SetupContext() {
  if (!CommandProcessor::SetupContext()) {
    XELOGE("Failed to initialize base command processor context");
    return false;
  }

  auto context = GetD3D12Context();
  auto provider = context->GetD3D12Provider();
  auto device = provider->GetDevice();
  auto direct_queue = provider->GetDirectQueue();

  for (uint32_t i = 0; i < ui::d3d12::D3D12Context::kQueuedFrames; ++i) {
    command_lists_setup_[i] = ui::d3d12::CommandList::Create(
        device, direct_queue, D3D12_COMMAND_LIST_TYPE_DIRECT);
    command_lists_[i] = ui::d3d12::CommandList::Create(
        device, direct_queue, D3D12_COMMAND_LIST_TYPE_DIRECT);
    if (command_lists_setup_[i] == nullptr || command_lists_[i] == nullptr) {
      XELOGE("Failed to create the command lists");
      return false;
    }
  }

  constant_buffer_pool_ =
      std::make_unique<ui::d3d12::UploadBufferPool>(context, 1024 * 1024);
  view_heap_pool_ = std::make_unique<ui::d3d12::DescriptorHeapPool>(
      context, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV, 32768);
  // Can't create a shader-visible heap with more than 2048 samplers.
  sampler_heap_pool_ = std::make_unique<ui::d3d12::DescriptorHeapPool>(
      context, D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER, 2048);

  shared_memory_ = std::make_unique<SharedMemory>(memory_, context);
  if (!shared_memory_->Initialize()) {
    XELOGE("Failed to initialize shared memory");
    return false;
  }

  pipeline_cache_ =
      std::make_unique<PipelineCache>(this, register_file_, context);

  return true;
}

void D3D12CommandProcessor::ShutdownContext() {
  auto context = GetD3D12Context();
  context->AwaitAllFramesCompletion();

  sampler_heap_pool_.reset();
  view_heap_pool_.reset();
  constant_buffer_pool_.reset();

  pipeline_cache_.reset();

  // Root signatured are used by pipelines, thus freed after the pipelines.
  for (auto it : root_signatures_) {
    it.second->Release();
  }
  root_signatures_.clear();

  shared_memory_.reset();

  for (uint32_t i = 0; i < ui::d3d12::D3D12Context::kQueuedFrames; ++i) {
    command_lists_[i].reset();
    command_lists_setup_[i].reset();
  }

  CommandProcessor::ShutdownContext();
}

void D3D12CommandProcessor::WriteRegister(uint32_t index, uint32_t value) {
  CommandProcessor::WriteRegister(index, value);

  if (index >= XE_GPU_REG_SHADER_CONSTANT_000_X &&
      index <= XE_GPU_REG_SHADER_CONSTANT_511_W) {
    uint32_t component_index = index - XE_GPU_REG_SHADER_CONSTANT_000_X;
    cbuffer_bindings_float_[component_index >> 7].up_to_date = false;
  } else if (index >= XE_GPU_REG_SHADER_CONSTANT_BOOL_000_031 &&
             index <= XE_GPU_REG_SHADER_CONSTANT_LOOP_31) {
    cbuffer_bindings_bool_loop_.up_to_date = false;
  } else if (index >= XE_GPU_REG_SHADER_CONSTANT_FETCH_00_0 &&
             index <= XE_GPU_REG_SHADER_CONSTANT_FETCH_31_5) {
    cbuffer_bindings_fetch_.up_to_date = false;
  }
}

void D3D12CommandProcessor::PerformSwap(uint32_t frontbuffer_ptr,
                                        uint32_t frontbuffer_width,
                                        uint32_t frontbuffer_height) {
  SCOPE_profile_cpu_f("gpu");

  EndFrame();

  if (cache_clear_requested_) {
    cache_clear_requested_ = false;
    GetD3D12Context()->AwaitAllFramesCompletion();

    sampler_heap_pool_->ClearCache();
    view_heap_pool_->ClearCache();
    constant_buffer_pool_->ClearCache();

    pipeline_cache_->ClearCache();

    for (auto it : root_signatures_) {
      it.second->Release();
    }
    root_signatures_.clear();

    // TODO(Triang3l): Shared memory cache clear.
    // shared_memory_->ClearCache();
  }
}

Shader* D3D12CommandProcessor::LoadShader(ShaderType shader_type,
                                          uint32_t guest_address,
                                          const uint32_t* host_address,
                                          uint32_t dword_count) {
  return pipeline_cache_->LoadShader(shader_type, guest_address, host_address,
                                     dword_count);
}

bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
                                      uint32_t index_count,
                                      IndexBufferInfo* index_buffer_info) {
  auto device = GetD3D12Context()->GetD3D12Provider()->GetDevice();
  auto& regs = *register_file_;

#if FINE_GRAINED_DRAW_SCOPES
  SCOPE_profile_cpu_f("gpu");
#endif  // FINE_GRAINED_DRAW_SCOPES

  auto enable_mode = static_cast<xenos::ModeControl>(
      regs[XE_GPU_REG_RB_MODECONTROL].u32 & 0x7);
  if (enable_mode == xenos::ModeControl::kIgnore) {
    // Ignored.
    return true;
  } else if (enable_mode == xenos::ModeControl::kCopy) {
    // Special copy handling.
    return IssueCopy();
  }

  if ((regs[XE_GPU_REG_RB_SURFACE_INFO].u32 & 0x3FFF) == 0) {
    // Doesn't actually draw.
    return true;
  }
  if ((regs[XE_GPU_REG_PA_SU_SC_MODE_CNTL].u32 & 0x3) == 0x3 &&
      primitive_type != PrimitiveType::kPointList &&
      primitive_type != PrimitiveType::kRectangleList) {
    // Both sides are culled - can't reproduce this with rasterizer state.
    return true;
  }

  bool indexed = index_buffer_info != nullptr && index_buffer_info->guest_base;
  if (indexed && regs[XE_GPU_REG_PA_SU_SC_MODE_CNTL].u32 & (1 << 21)) {
    uint32_t reset_index = regs[XE_GPU_REG_VGT_MULTI_PRIM_IB_RESET_INDX].u32;
    uint32_t reset_index_expected;
    if (index_buffer_info->format == IndexFormat::kInt32) {
      reset_index_expected = 0xFFFFFFFFu;
    } else {
      reset_index_expected = 0xFFFFu;
    }
    if (reset_index != reset_index_expected) {
      // Only 0xFFFF and 0xFFFFFFFF primitive restart indices are supported by
      // Direct3D 12 (endianness doesn't matter for them). However, Direct3D 9
      // uses 0xFFFF as the reset index. With shared memory, it's impossible to
      // replace the cut index in the buffer without affecting the game memory.
      XELOGE(
          "The game uses the primitive restart index 0x%X that isn't 0xFFFF or "
          "0xFFFFFFFF. Report the game to Xenia developers so geometry shaders "
          "will be added to handle this!",
          reset_index);
      assert_always();
      return false;
    }
  }

  // Shaders will have already been defined by previous loads.
  // We need them to do just about anything so validate here.
  auto vertex_shader = static_cast<D3D12Shader*>(active_vertex_shader());
  auto pixel_shader = static_cast<D3D12Shader*>(active_pixel_shader());
  if (!vertex_shader) {
    // Always need a vertex shader.
    return false;
  }
  // Depth-only mode doesn't need a pixel shader.
  if (enable_mode == xenos::ModeControl::kDepth) {
    pixel_shader = nullptr;
  } else if (!pixel_shader) {
    // Need a pixel shader in normal color mode.
    return true;
  }

  bool new_frame = BeginFrame();
  ID3D12GraphicsCommandList* command_list =
      command_lists_[current_queue_frame_]->GetCommandList();

  // Set the primitive topology.
  D3D_PRIMITIVE_TOPOLOGY primitive_topology;
  switch (primitive_type) {
    case PrimitiveType::kLineList:
      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_LINELIST;
      break;
    case PrimitiveType::kLineStrip:
      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_LINESTRIP;
      break;
    case PrimitiveType::kTriangleList:
      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST;
      break;
    case PrimitiveType::kTriangleStrip:
      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP;
      break;
    default:
      return false;
  }
  if (primitive_topology_ != primitive_topology) {
    primitive_topology_ = primitive_topology;
    command_list->IASetPrimitiveTopology(primitive_topology);
  }

  // Get the pipeline and translate the shaders so used textures are known.
  ID3D12PipelineState* pipeline;
  ID3D12RootSignature* root_signature;
  auto pipeline_status = pipeline_cache_->ConfigurePipeline(
      vertex_shader, pixel_shader, primitive_type,
      indexed ? index_buffer_info->format : IndexFormat::kInt16, &pipeline,
      &root_signature);
  if (pipeline_status == PipelineCache::UpdateStatus::kError) {
    return false;
  }

  // Update viewport, scissor, blend factor and stencil reference.
  UpdateFixedFunctionState(command_list);

  // Bind the pipeline.
  if (current_pipeline_ != pipeline) {
    current_pipeline_ = pipeline;
    command_list->SetPipelineState(pipeline);
  }

  // Update system constants before uploading them.
  UpdateSystemConstantValues(indexed ? index_buffer_info->endianness
                                     : Endian::kUnspecified);

  // Update constant buffers, descriptors and root parameters.
  if (!UpdateBindings(command_list, vertex_shader, pixel_shader,
                      root_signature)) {
    return false;
  }

  // Ensure vertex and index buffers are resident and draw.
  // TODO(Triang3l): Cache residency for ranges in a way similar to how texture
  // validity will be tracked.
  shared_memory_->UseForReading(command_list);
  uint64_t vertex_buffers_resident[2] = {};
  for (const auto& vertex_binding : vertex_shader->vertex_bindings()) {
    uint32_t vfetch_index = vertex_binding.fetch_constant;
    if (vertex_buffers_resident[vfetch_index >> 6] &
        (1ull << (vfetch_index & 63))) {
      continue;
    }
    uint32_t vfetch_constant_index =
        XE_GPU_REG_SHADER_CONSTANT_FETCH_00_0 + vfetch_index * 2;
    if ((regs[vfetch_constant_index].u32 & 0x3) != 3) {
      XELOGE("Vertex fetch type is not 3!");
      assert_always();
      return false;
    }
    shared_memory_->UseRange(regs[vfetch_constant_index].u32 & 0x1FFFFFFC,
                             regs[vfetch_constant_index + 1].u32 & 0x3FFFFFC);
    vertex_buffers_resident[vfetch_index >> 6] |= 1ull << (vfetch_index & 63);
  }
  if (indexed) {
    uint32_t index_base = index_buffer_info->guest_base & 0x1FFFFFFF;
    uint32_t index_size = index_buffer_info->format == IndexFormat::kInt32
                              ? sizeof(uint32_t)
                              : sizeof(uint16_t);
    index_base &= ~(index_size - 1);
    uint32_t index_buffer_size = index_buffer_info->count * index_size;
    shared_memory_->UseRange(index_base, index_buffer_size);
    D3D12_INDEX_BUFFER_VIEW index_buffer_view;
    index_buffer_view.BufferLocation =
        shared_memory_->GetGPUAddress() + index_base;
    index_buffer_view.SizeInBytes = index_buffer_size;
    index_buffer_view.Format = index_buffer_info->format == IndexFormat::kInt32
                                   ? DXGI_FORMAT_R32_UINT
                                   : DXGI_FORMAT_R16_UINT;
    command_list->IASetIndexBuffer(&index_buffer_view);
    command_list->DrawIndexedInstanced(index_count, 1, 0, 0, 0);
  } else {
    command_list->DrawInstanced(index_count, 1, 0, 0);
  }

  return true;
}

bool D3D12CommandProcessor::IssueCopy() { return true; }

bool D3D12CommandProcessor::BeginFrame() {
  if (current_queue_frame_ != UINT32_MAX) {
    return false;
  }

  auto context = GetD3D12Context();
  context->BeginSwap();
  current_queue_frame_ = context->GetCurrentQueueFrame();

  // Reset fixed-function state.
  ff_viewport_update_needed_ = true;
  ff_scissor_update_needed_ = true;
  ff_blend_factor_update_needed_ = true;
  ff_stencil_ref_update_needed_ = true;

  // Reset bindings, particularly because the buffers backing them are recycled.
  current_pipeline_ = nullptr;
  current_graphics_root_signature_ = nullptr;
  current_graphics_root_up_to_date_ = 0;
  current_view_heap_ = nullptr;
  current_sampler_heap_ = nullptr;
  cbuffer_bindings_system_.up_to_date = false;
  for (uint32_t i = 0; i < xe::countof(cbuffer_bindings_float_); ++i) {
    cbuffer_bindings_float_[i].up_to_date = false;
  }
  cbuffer_bindings_bool_loop_.up_to_date = false;
  cbuffer_bindings_fetch_.up_to_date = false;
  draw_view_full_update_ = 0;
  draw_sampler_full_update_ = 0;
  primitive_topology_ = D3D_PRIMITIVE_TOPOLOGY_UNDEFINED;

  command_lists_setup_[current_queue_frame_]->BeginRecording();
  command_lists_[current_queue_frame_]->BeginRecording();

  constant_buffer_pool_->BeginFrame();
  view_heap_pool_->BeginFrame();
  sampler_heap_pool_->BeginFrame();

  shared_memory_->BeginFrame();

  return true;
}

bool D3D12CommandProcessor::EndFrame() {
  if (current_queue_frame_ == UINT32_MAX) {
    return false;
  }

  auto command_list_setup = command_lists_setup_[current_queue_frame_].get();
  auto command_list = command_lists_[current_queue_frame_].get();

  bool setup_written = shared_memory_->EndFrame(
      command_list_setup->GetCommandList(), command_list->GetCommandList());

  if (setup_written) {
    command_list_setup->Execute();
  } else {
    command_list_setup->AbortRecording();
  }
  command_list->Execute();

  sampler_heap_pool_->EndFrame();
  view_heap_pool_->EndFrame();
  constant_buffer_pool_->EndFrame();

  auto context = GetD3D12Context();
  context->EndSwap();
  current_queue_frame_ = UINT32_MAX;

  return true;
}

void D3D12CommandProcessor::UpdateFixedFunctionState(
    ID3D12GraphicsCommandList* command_list) {
  auto& regs = *register_file_;

  // Window parameters.
  // http://ftp.tku.edu.tw/NetBSD/NetBSD-current/xsrc/external/mit/xf86-video-ati/dist/src/r600_reg_auto_r6xx.h
  // See r200UpdateWindow:
  // https://github.com/freedreno/mesa/blob/master/src/mesa/drivers/dri/r200/r200_state.c
  uint32_t pa_sc_window_offset = regs[XE_GPU_REG_PA_SC_WINDOW_OFFSET].u32;
  int16_t window_offset_x = pa_sc_window_offset & 0x7FFF;
  int16_t window_offset_y = (pa_sc_window_offset >> 16) & 0x7FFF;
  if (window_offset_x & 0x4000) {
    window_offset_x |= 0x8000;
  }
  if (window_offset_y & 0x4000) {
    window_offset_y |= 0x8000;
  }

  // Supersampling replacing multisampling due to difficulties of emulating
  // EDRAM with multisampling.
  MsaaSamples msaa_samples =
      MsaaSamples((regs[XE_GPU_REG_RB_SURFACE_INFO].u32 >> 16) & 0x3);
  uint32_t ssaa_scale_x = msaa_samples >= MsaaSamples::k4X ? 2 : 1;
  uint32_t ssaa_scale_y = msaa_samples >= MsaaSamples::k2X ? 2 : 1;

  // Viewport.
  // PA_CL_VTE_CNTL contains whether offsets and scales are enabled.
  // http://www.x.org/docs/AMD/old/evergreen_3D_registers_v2.pdf
  // In games, either all are enabled (for regular drawing) or none are (for
  // rectangle lists usually).
  //
  // If scale/offset is enabled, the Xenos shader is writing (neglecting W
  // division) position in the NDC (-1, -1, dx_clip_space_def - 1) -> (1, 1, 1)
  // box. If it's not, the position is in screen space. Since we can only use
  // the NDC in PC APIs, we use a viewport of the largest possible size, and
  // divide the position by it in translated shaders.
  uint32_t pa_cl_vte_cntl = regs[XE_GPU_REG_PA_CL_VTE_CNTL].u32;
  float viewport_scale_x = (pa_cl_vte_cntl & (1 << 0))
                               ? regs[XE_GPU_REG_PA_CL_VPORT_XSCALE].f32
                               : 1280.0f;
  float viewport_scale_y = (pa_cl_vte_cntl & (1 << 2))
                               ? -regs[XE_GPU_REG_PA_CL_VPORT_YSCALE].f32
                               : -1280.0f;
  // TODO(Triang3l): Investigate how unnormalized coordinates should work when
  // using a D24FS8 depth buffer. A 20e4 buffer can store values up to
  // 511.99985, however, in the depth buffer, something like 1/z is stored, and
  // if the shader writes 1/511.99985, it probably won't become 1 in the depth
  // buffer. Unnormalized coordinates are mostly used when clearing both depth
  // and color to 0 though.
  float viewport_scale_z = (pa_cl_vte_cntl & (1 << 4))
                               ? regs[XE_GPU_REG_PA_CL_VPORT_ZSCALE].f32
                               : 1.0f;
  float viewport_offset_x = (pa_cl_vte_cntl & (1 << 1))
                                ? regs[XE_GPU_REG_PA_CL_VPORT_XOFFSET].f32
                                : viewport_scale_x;
  float viewport_offset_y = (pa_cl_vte_cntl & (1 << 3))
                                ? regs[XE_GPU_REG_PA_CL_VPORT_YOFFSET].f32
                                : viewport_scale_y;
  float viewport_offset_z = (pa_cl_vte_cntl & (1 << 5))
                                ? regs[XE_GPU_REG_PA_CL_VPORT_ZOFFSET].f32
                                : 0.0f;
  if (regs[XE_GPU_REG_PA_SU_SC_MODE_CNTL].u32 & (1 << 16)) {
    viewport_offset_x += float(window_offset_x);
    viewport_offset_y += float(window_offset_y);
  }
  D3D12_VIEWPORT viewport;
  viewport.TopLeftX =
      (viewport_offset_x - viewport_scale_x) * float(ssaa_scale_x);
  viewport.TopLeftY =
      (viewport_offset_y - viewport_scale_y) * float(ssaa_scale_y);
  viewport.Width = viewport_scale_x * 2.0f * float(ssaa_scale_x);
  viewport.Height = viewport_scale_y * 2.0f * float(ssaa_scale_y);
  viewport.MinDepth = viewport_offset_z;
  viewport.MaxDepth = viewport_offset_z + viewport_scale_z;
  ff_viewport_update_needed_ |= ff_viewport_.TopLeftX != viewport.TopLeftX;
  ff_viewport_update_needed_ |= ff_viewport_.TopLeftY != viewport.TopLeftY;
  ff_viewport_update_needed_ |= ff_viewport_.Width != viewport.Width;
  ff_viewport_update_needed_ |= ff_viewport_.Height != viewport.Height;
  ff_viewport_update_needed_ |= ff_viewport_.MinDepth != viewport.MinDepth;
  ff_viewport_update_needed_ |= ff_viewport_.MaxDepth != viewport.MaxDepth;
  if (ff_viewport_update_needed_) {
    ff_viewport_ = viewport;
    command_list->RSSetViewports(1, &viewport);
    ff_viewport_update_needed_ = false;
  }

  // Scissor.
  uint32_t pa_sc_window_scissor_tl =
      regs[XE_GPU_REG_PA_SC_WINDOW_SCISSOR_TL].u32;
  uint32_t pa_sc_window_scissor_br =
      regs[XE_GPU_REG_PA_SC_WINDOW_SCISSOR_BR].u32;
  D3D12_RECT scissor;
  scissor.left = pa_sc_window_scissor_tl & 0x7FFF;
  scissor.top = (pa_sc_window_scissor_tl >> 16) & 0x7FFF;
  scissor.right = pa_sc_window_scissor_br & 0x7FFF;
  scissor.bottom = (pa_sc_window_scissor_br >> 16) & 0x7FFF;
  if (!(pa_sc_window_scissor_tl & (1u << 31))) {
    // !WINDOW_OFFSET_DISABLE.
    scissor.left = std::max(scissor.left + window_offset_x, LONG(0));
    scissor.top = std::max(scissor.top + window_offset_y, LONG(0));
    scissor.right = std::max(scissor.right + window_offset_x, LONG(0));
    scissor.bottom = std::max(scissor.bottom + window_offset_y, LONG(0));
  }
  scissor.left *= ssaa_scale_x;
  scissor.top *= ssaa_scale_y;
  scissor.right *= ssaa_scale_x;
  scissor.bottom *= ssaa_scale_y;
  ff_scissor_update_needed_ |= ff_scissor_.left != scissor.left;
  ff_scissor_update_needed_ |= ff_scissor_.top != scissor.top;
  ff_scissor_update_needed_ |= ff_scissor_.right != scissor.right;
  ff_scissor_update_needed_ |= ff_scissor_.bottom != scissor.bottom;
  if (ff_scissor_update_needed_) {
    ff_scissor_ = scissor;
    command_list->RSSetScissorRects(1, &scissor);
    ff_scissor_update_needed_ = false;
  }

  // Blend factor.
  ff_blend_factor_update_needed_ |=
      ff_blend_factor_[0] != regs[XE_GPU_REG_RB_BLEND_RED].f32;
  ff_blend_factor_update_needed_ |=
      ff_blend_factor_[1] != regs[XE_GPU_REG_RB_BLEND_GREEN].f32;
  ff_blend_factor_update_needed_ |=
      ff_blend_factor_[2] != regs[XE_GPU_REG_RB_BLEND_BLUE].f32;
  ff_blend_factor_update_needed_ |=
      ff_blend_factor_[3] != regs[XE_GPU_REG_RB_BLEND_ALPHA].f32;
  if (ff_blend_factor_update_needed_) {
    ff_blend_factor_[0] = regs[XE_GPU_REG_RB_BLEND_RED].f32;
    ff_blend_factor_[1] = regs[XE_GPU_REG_RB_BLEND_GREEN].f32;
    ff_blend_factor_[2] = regs[XE_GPU_REG_RB_BLEND_BLUE].f32;
    ff_blend_factor_[3] = regs[XE_GPU_REG_RB_BLEND_ALPHA].f32;
    command_list->OMSetBlendFactor(ff_blend_factor_);
    ff_blend_factor_update_needed_ = false;
  }

  // Stencil reference value.
  uint32_t stencil_ref = regs[XE_GPU_REG_RB_STENCILREFMASK].u32 & 0xFF;
  ff_stencil_ref_update_needed_ |= ff_stencil_ref_ != stencil_ref;
  if (ff_stencil_ref_update_needed_) {
    ff_stencil_ref_ = stencil_ref;
    command_list->OMSetStencilRef(stencil_ref);
    ff_stencil_ref_update_needed_ = false;
  }
}

void D3D12CommandProcessor::UpdateSystemConstantValues(Endian index_endian) {
  auto& regs = *register_file_;
  uint32_t vgt_indx_offset = regs[XE_GPU_REG_VGT_INDX_OFFSET].u32;
  uint32_t pa_cl_vte_cntl = regs[XE_GPU_REG_PA_CL_VTE_CNTL].u32;
  uint32_t pa_cl_clip_cntl = regs[XE_GPU_REG_PA_CL_CLIP_CNTL].u32;
  uint32_t pa_su_vtx_cntl = regs[XE_GPU_REG_PA_SU_VTX_CNTL].u32;
  uint32_t sq_program_cntl = regs[XE_GPU_REG_SQ_PROGRAM_CNTL].u32;
  uint32_t sq_context_misc = regs[XE_GPU_REG_SQ_CONTEXT_MISC].u32;
  uint32_t rb_surface_info = regs[XE_GPU_REG_RB_SURFACE_INFO].u32;

  bool dirty = false;

  // Vertex index offset.
  dirty |= system_constants_.vertex_base_index != vgt_indx_offset;
  system_constants_.vertex_base_index = vgt_indx_offset;

  // Index buffer endianness.
  dirty |= system_constants_.vertex_index_endian != uint32_t(index_endian);
  system_constants_.vertex_index_endian = uint32_t(index_endian);

  // W0 division control.
  // http://www.x.org/docs/AMD/old/evergreen_3D_registers_v2.pdf
  // VTX_XY_FMT = true: the incoming XY have already been multiplied by 1/W0.
  //            = false: multiply the X, Y coordinates by 1/W0.
  // VTX_Z_FMT = true: the incoming Z has already been multiplied by 1/W0.
  //           = false: multiply the Z coordinate by 1/W0.
  // VTX_W0_FMT = true: the incoming W0 is not 1/W0. Perform the reciprocal to
  //                    get 1/W0.
  float vtx_xy_fmt = (pa_cl_vte_cntl & (1 << 8)) ? 1.0f : 0.0f;
  float vtx_z_fmt = (pa_cl_vte_cntl & (1 << 9)) ? 1.0f : 0.0f;
  float vtx_w0_fmt = (pa_cl_vte_cntl & (1 << 10)) ? 1.0f : 0.0f;
  dirty |= system_constants_.mul_rcp_w[0] != vtx_xy_fmt;
  dirty |= system_constants_.mul_rcp_w[1] != vtx_z_fmt;
  dirty |= system_constants_.mul_rcp_w[2] != vtx_w0_fmt;
  system_constants_.mul_rcp_w[0] = vtx_xy_fmt;
  system_constants_.mul_rcp_w[1] = vtx_z_fmt;
  system_constants_.mul_rcp_w[2] = vtx_w0_fmt;

  // Conversion to Direct3D 12 normalized device coordinates.
  // See viewport configuration in UpdateFixedFunctionState for explanations.
  // X and Y scale/offset is to convert unnormalized coordinates generated by
  // shaders (for rectangle list drawing, for instance) to the 2560x2560
  // viewport that is used to emulate unnormalized coordinates.
  // Z scale/offset is to convert from OpenGL NDC to Direct3D NDC if needed.
  // Also apply half-pixel offset to reproduce Direct3D 9 rasterization rules.
  // TODO(Triang3l): Check if pixel coordinates need to offset depending on a
  // different register (and if there's such register at all).
  bool gl_clip_space_def =
      !(pa_cl_clip_cntl & (1 << 19)) && (pa_cl_vte_cntl & (1 << 4));
  float ndc_scale_x = (pa_cl_vte_cntl & (1 << 0)) ? 1.0f : 1.0f / 1280.0f;
  float ndc_scale_y = (pa_cl_vte_cntl & (1 << 2)) ? 1.0f : 1.0f / 1280.0f;
  float ndc_scale_z = gl_clip_space_def ? 0.5f : 1.0f;
  float ndc_offset_x = (pa_cl_vte_cntl & (1 << 1)) ? 0.0f : -1.0f;
  float ndc_offset_y = (pa_cl_vte_cntl & (1 << 3)) ? 0.0f : -1.0f;
  float ndc_offset_z = gl_clip_space_def ? 0.5f : 0.0f;
  float pixel_half_pixel_offset = 0.0f;
  if (!(pa_su_vtx_cntl & (1 << 0))) {
    if (pa_cl_vte_cntl & (1 << 0)) {
      float viewport_scale_x = regs[XE_GPU_REG_PA_CL_VPORT_XSCALE].f32;
      if (viewport_scale_x != 0.0f) {
        ndc_offset_x -= 0.5f / viewport_scale_x;
      }
    } else {
      ndc_offset_x -= 1.0f / 2560.0f;
    }
    if (pa_cl_vte_cntl & (1 << 2)) {
      float viewport_scale_y = regs[XE_GPU_REG_PA_CL_VPORT_YSCALE].f32;
      if (viewport_scale_y != 0.0f) {
        ndc_offset_y -= 0.5f / viewport_scale_y;
      }
    } else {
      ndc_offset_y -= 1.0f / 2560.0f;
    }
    pixel_half_pixel_offset = -0.5f;
  }
  dirty |= system_constants_.ndc_scale[0] != ndc_scale_x;
  dirty |= system_constants_.ndc_scale[1] != ndc_scale_y;
  dirty |= system_constants_.ndc_scale[2] != ndc_scale_z;
  dirty |= system_constants_.ndc_offset[0] != ndc_offset_x;
  dirty |= system_constants_.ndc_offset[1] != ndc_offset_y;
  dirty |= system_constants_.ndc_offset[2] != ndc_offset_z;
  dirty |= system_constants_.pixel_half_pixel_offset != pixel_half_pixel_offset;
  system_constants_.ndc_scale[0] = ndc_scale_x;
  system_constants_.ndc_scale[1] = ndc_scale_y;
  system_constants_.ndc_scale[2] = ndc_scale_z;
  system_constants_.ndc_offset[0] = ndc_offset_x;
  system_constants_.ndc_offset[1] = ndc_offset_y;
  system_constants_.ndc_offset[2] = ndc_offset_z;
  system_constants_.pixel_half_pixel_offset = pixel_half_pixel_offset;

  // Pixel position register.
  uint32_t pixel_pos_reg =
      (sq_program_cntl & (1 << 18)) ? (sq_context_misc >> 8) & 0xFF : UINT_MAX;
  dirty |= system_constants_.pixel_pos_reg != pixel_pos_reg;
  system_constants_.pixel_pos_reg = pixel_pos_reg;

  // Supersampling anti-aliasing pixel scale inverse for pixel positions.
  MsaaSamples msaa_samples = MsaaSamples((rb_surface_info >> 16) & 0x3);
  float ssaa_inv_scale_x = msaa_samples >= MsaaSamples::k4X ? 0.5f : 1.0f;
  float ssaa_inv_scale_y = msaa_samples >= MsaaSamples::k2X ? 0.5f : 1.0f;
  dirty |= system_constants_.ssaa_inv_scale[0] != ssaa_inv_scale_x;
  dirty |= system_constants_.ssaa_inv_scale[1] != ssaa_inv_scale_y;
  system_constants_.ssaa_inv_scale[0] = ssaa_inv_scale_x;
  system_constants_.ssaa_inv_scale[1] = ssaa_inv_scale_y;

  // TODO(Triang3l): Whether textures are 3D or stacked.

  cbuffer_bindings_system_.up_to_date &= dirty;
}

bool D3D12CommandProcessor::UpdateBindings(
    ID3D12GraphicsCommandList* command_list, const D3D12Shader* vertex_shader,
    const D3D12Shader* pixel_shader, ID3D12RootSignature* root_signature) {
  auto provider = GetD3D12Context()->GetD3D12Provider();
  auto device = provider->GetDevice();
  auto& regs = *register_file_;

  // Bind the new root signature.
  if (current_graphics_root_signature_ != root_signature) {
    current_graphics_root_signature_ = root_signature;
    // We don't know which root parameters are up to date anymore.
    current_graphics_root_up_to_date_ = 0;
    command_list->SetGraphicsRootSignature(root_signature);
  }

  // Begin updating descriptors.
  bool write_common_constant_views = false;
  bool write_vertex_float_constant_views = false;
  bool write_pixel_float_constant_views = false;
  bool write_fetch_constant_view = false;

  // Update constant buffers.
  // TODO(Triang3l): Update the system constant buffer - will crash without it.
  if (!cbuffer_bindings_system_.up_to_date) {
    uint8_t* system_constants = constant_buffer_pool_->RequestFull(
        xe::align(uint32_t(sizeof(system_constants_)), 256u), nullptr, nullptr,
        &cbuffer_bindings_system_.buffer_address);
    if (system_constants == nullptr) {
      return false;
    }
    std::memcpy(system_constants, &system_constants_,
                sizeof(system_constants_));
    cbuffer_bindings_system_.up_to_date = true;
    write_common_constant_views = true;
  }
  if (!cbuffer_bindings_bool_loop_.up_to_date) {
    uint32_t* bool_loop_constants =
        reinterpret_cast<uint32_t*>(constant_buffer_pool_->RequestFull(
            768, nullptr, nullptr,
            &cbuffer_bindings_bool_loop_.buffer_address));
    if (bool_loop_constants == nullptr) {
      return false;
    }
    // Bool and loop constants are quadrupled to allow dynamic indexing.
    for (uint32_t i = 0; i < 40; ++i) {
      uint32_t bool_loop_constant =
          regs[XE_GPU_REG_SHADER_CONSTANT_BOOL_000_031 + i].u32;
      uint32_t* bool_loop_constant_vector = bool_loop_constants + (i << 2);
      bool_loop_constant_vector[0] = bool_loop_constant;
      bool_loop_constant_vector[1] = bool_loop_constant;
      bool_loop_constant_vector[2] = bool_loop_constant;
      bool_loop_constant_vector[3] = bool_loop_constant;
    }
    cbuffer_bindings_bool_loop_.up_to_date = true;
    write_common_constant_views = true;
  }
  for (uint32_t i = 0; i < 16; ++i) {
    ConstantBufferBinding& float_binding = cbuffer_bindings_float_[i];
    if (float_binding.up_to_date) {
      continue;
    }
    uint8_t* float_constants = constant_buffer_pool_->RequestFull(
        512, nullptr, nullptr, &float_binding.buffer_address);
    if (float_constants == nullptr) {
      return false;
    }
    std::memcpy(float_constants,
                &regs[XE_GPU_REG_SHADER_CONSTANT_000_X + (i << 7)].f32,
                32 * 4 * sizeof(uint32_t));
    float_binding.up_to_date = true;
    if (i < 8) {
      write_vertex_float_constant_views = true;
    } else {
      write_pixel_float_constant_views = true;
    }
  }
  if (!cbuffer_bindings_fetch_.up_to_date) {
    uint8_t* fetch_constants = constant_buffer_pool_->RequestFull(
        768, nullptr, nullptr, &cbuffer_bindings_fetch_.buffer_address);
    if (fetch_constants == nullptr) {
      return false;
    }
    std::memcpy(fetch_constants,
                &regs[XE_GPU_REG_SHADER_CONSTANT_FETCH_00_0].u32,
                32 * 6 * sizeof(uint32_t));
    cbuffer_bindings_fetch_.up_to_date = true;
    write_fetch_constant_view = true;
  }

  // Update the descriptors.
  uint32_t view_count_partial_update = 0;
  if (write_common_constant_views) {
    // System and bool/loop constants.
    view_count_partial_update += 2;
  }
  if (write_vertex_float_constant_views) {
    // Vertex float constants.
    view_count_partial_update += 8;
  }
  if (write_pixel_float_constant_views) {
    // Pixel float constants.
    view_count_partial_update += 8;
  }
  if (write_fetch_constant_view) {
    // Fetch constants.
    ++view_count_partial_update;
  }
  // All the constants + shared memory.
  uint32_t view_count_full_update = 20;
  D3D12_CPU_DESCRIPTOR_HANDLE view_cpu_handle;
  D3D12_GPU_DESCRIPTOR_HANDLE view_gpu_handle;
  uint32_t view_handle_size = provider->GetDescriptorSizeView();
  uint64_t view_full_update_index = RequestViewDescriptors(
      draw_view_full_update_, view_count_partial_update, view_count_full_update,
      view_cpu_handle, view_gpu_handle);
  if (view_full_update_index == 0) {
    XELOGE("View full update index is 0!");
    return false;
  }
  if (draw_view_full_update_ != view_full_update_index) {
    // Need to update all descriptors.
    draw_view_full_update_ = view_full_update_index;
    write_common_constant_views = true;
    write_vertex_float_constant_views = true;
    write_pixel_float_constant_views = true;
    write_fetch_constant_view = true;
    // If updating fully, write the shared memory descriptor (t0, space1).
    shared_memory_->CreateSRV(view_cpu_handle);
    gpu_handle_shared_memory_ = view_gpu_handle;
    view_cpu_handle.ptr += view_handle_size;
    view_gpu_handle.ptr += view_handle_size;
    current_graphics_root_up_to_date_ &= ~(1u << kRootParameter_SharedMemory);
  }
  D3D12_CONSTANT_BUFFER_VIEW_DESC constant_buffer_desc;
  if (write_common_constant_views) {
    gpu_handle_common_constants_ = view_gpu_handle;
    // System constants (b0).
    constant_buffer_desc.BufferLocation =
        cbuffer_bindings_system_.buffer_address;
    constant_buffer_desc.SizeInBytes =
        xe::align(uint32_t(sizeof(system_constants_)), 256u);
    device->CreateConstantBufferView(&constant_buffer_desc, view_cpu_handle);
    view_cpu_handle.ptr += view_handle_size;
    view_gpu_handle.ptr += view_handle_size;
    // Bool/loop constants (b1).
    constant_buffer_desc.BufferLocation =
        cbuffer_bindings_bool_loop_.buffer_address;
    constant_buffer_desc.SizeInBytes = 768;
    device->CreateConstantBufferView(&constant_buffer_desc, view_cpu_handle);
    view_cpu_handle.ptr += view_handle_size;
    view_gpu_handle.ptr += view_handle_size;
    current_graphics_root_up_to_date_ &=
        ~(1u << kRootParameter_CommonConstants);
  }
  if (write_vertex_float_constant_views) {
    gpu_handle_vertex_float_constants_ = view_gpu_handle;
    // Vertex float constants (b2-b9).
    for (uint32_t i = 0; i < 8; ++i) {
      constant_buffer_desc.BufferLocation =
          cbuffer_bindings_float_[i].buffer_address;
      constant_buffer_desc.SizeInBytes = 512;
      device->CreateConstantBufferView(&constant_buffer_desc, view_cpu_handle);
      view_cpu_handle.ptr += view_handle_size;
      view_gpu_handle.ptr += view_handle_size;
    }
    current_graphics_root_up_to_date_ &=
        ~(1u << kRootParameter_VertexFloatConstants);
  }
  if (write_pixel_float_constant_views) {
    gpu_handle_pixel_float_constants_ = view_gpu_handle;
    // Pixel float constants (b2-b9).
    for (uint32_t i = 0; i < 8; ++i) {
      constant_buffer_desc.BufferLocation =
          cbuffer_bindings_float_[8 + i].buffer_address;
      constant_buffer_desc.SizeInBytes = 512;
      device->CreateConstantBufferView(&constant_buffer_desc, view_cpu_handle);
      view_cpu_handle.ptr += view_handle_size;
      view_gpu_handle.ptr += view_handle_size;
    }
    current_graphics_root_up_to_date_ &=
        ~(1u << kRootParameter_PixelFloatConstants);
  }
  if (write_fetch_constant_view) {
    gpu_handle_fetch_constants_ = view_gpu_handle;
    // Fetch constants (b10).
    constant_buffer_desc.BufferLocation =
        cbuffer_bindings_fetch_.buffer_address;
    constant_buffer_desc.SizeInBytes = 768;
    device->CreateConstantBufferView(&constant_buffer_desc, view_cpu_handle);
    view_cpu_handle.ptr += view_handle_size;
    view_gpu_handle.ptr += view_handle_size;
    current_graphics_root_up_to_date_ &= ~(1u << kRootParameter_FetchConstants);
  }

  // Update the root parameters.
  if (!(current_graphics_root_up_to_date_ &
        (1u << kRootParameter_FetchConstants))) {
    command_list->SetGraphicsRootDescriptorTable(kRootParameter_FetchConstants,
                                                 gpu_handle_fetch_constants_);
    current_graphics_root_up_to_date_ |= 1u << kRootParameter_FetchConstants;
  }
  if (!(current_graphics_root_up_to_date_ &
        (1u << kRootParameter_VertexFloatConstants))) {
    command_list->SetGraphicsRootDescriptorTable(
        kRootParameter_VertexFloatConstants,
        gpu_handle_vertex_float_constants_);
    current_graphics_root_up_to_date_ |= 1u
                                         << kRootParameter_VertexFloatConstants;
  }
  if (!(current_graphics_root_up_to_date_ &
        (1u << kRootParameter_PixelFloatConstants))) {
    command_list->SetGraphicsRootDescriptorTable(
        kRootParameter_PixelFloatConstants, gpu_handle_pixel_float_constants_);
    current_graphics_root_up_to_date_ |= 1u
                                         << kRootParameter_PixelFloatConstants;
  }
  if (!(current_graphics_root_up_to_date_ &
        (1u << kRootParameter_CommonConstants))) {
    command_list->SetGraphicsRootDescriptorTable(kRootParameter_CommonConstants,
                                                 gpu_handle_common_constants_);
    current_graphics_root_up_to_date_ |= 1u << kRootParameter_CommonConstants;
  }
  if (!(current_graphics_root_up_to_date_ &
        (1u << kRootParameter_SharedMemory))) {
    command_list->SetGraphicsRootDescriptorTable(kRootParameter_SharedMemory,
                                                 gpu_handle_shared_memory_);
    current_graphics_root_up_to_date_ |= 1u << kRootParameter_SharedMemory;
  }

  return true;
}

}  // namespace d3d12
}  // namespace gpu
}  // namespace xe