[D3D12] Immediate drawer

src/xenia/ui/d3d12/d3d12_context.cc

@@ -256,6 +256,10 @@ void D3D12Context::BeginSwap() {
     barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
     barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
     graphics_command_list->ResourceBarrier(1, &barrier);
+
+    D3D12_CPU_DESCRIPTOR_HANDLE back_buffer_rtv = GetSwapChainBackBufferRTV();
+    graphics_command_list->OMSetRenderTargets(1, &back_buffer_rtv, TRUE,
+                                              nullptr);
   }
 }
 

src/xenia/ui/d3d12/d3d12_immediate_drawer.cc

@@ -9,7 +9,11 @@
 
 #include "xenia/ui/d3d12/d3d12_immediate_drawer.h"
 
+#include <cstring>
+
+#include "xenia/base/assert.h"
 #include "xenia/base/logging.h"
+#include "xenia/base/math.h"
 
 namespace xe {
 namespace ui {
@@ -21,10 +25,87 @@ namespace d3d12 {
 
 class D3D12ImmediateTexture : public ImmediateTexture {
  public:
-  D3D12ImmediateTexture(uint32_t width, uint32_t height)
+  static constexpr DXGI_FORMAT kFormat = DXGI_FORMAT_R8G8B8A8_UNORM;
-      : ImmediateTexture(width, height) {}
+
+  D3D12ImmediateTexture(uint32_t width, uint32_t height,
+                        ImmediateTextureFilter filter, bool repeat);
+
+  bool Initialize(ID3D12Device* device);
+  void Shutdown();
+
+  ID3D12Resource* GetResource() const { return resource_; }
+  void Transition(D3D12_RESOURCE_STATES new_state,
+                  ID3D12GraphicsCommandList* command_list);
+
+  ImmediateTextureFilter GetFilter() const { return filter_; }
+  bool IsRepeated() const { return repeat_; }
+
+ private:
+  ID3D12Resource* resource_ = nullptr;
+  D3D12_RESOURCE_STATES state_;
+  ImmediateTextureFilter filter_;
+  bool repeat_;
 };
 
+D3D12ImmediateTexture::D3D12ImmediateTexture(uint32_t width, uint32_t height,
+                                             ImmediateTextureFilter filter,
+                                             bool repeat)
+    : ImmediateTexture(width, height), filter_(filter), repeat_(repeat) {
+  handle = reinterpret_cast<uintptr_t>(this);
+}
+
+bool D3D12ImmediateTexture::Initialize(ID3D12Device* device) {
+  // The first operation will likely be copying the contents.
+  state_ = D3D12_RESOURCE_STATE_COPY_DEST;
+
+  D3D12_HEAP_PROPERTIES heap_properties = {};
+  heap_properties.Type = D3D12_HEAP_TYPE_DEFAULT;
+  D3D12_RESOURCE_DESC resource_desc;
+  resource_desc.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D;
+  resource_desc.Alignment = 0;
+  resource_desc.Width = width;
+  resource_desc.Height = height;
+  resource_desc.DepthOrArraySize = 1;
+  resource_desc.MipLevels = 1;
+  resource_desc.Format = kFormat;
+  resource_desc.SampleDesc.Count = 1;
+  resource_desc.SampleDesc.Quality = 0;
+  resource_desc.Layout = D3D12_TEXTURE_LAYOUT_UNKNOWN;
+  resource_desc.Flags = D3D12_RESOURCE_FLAG_NONE;
+  if (FAILED(device->CreateCommittedResource(
+          &heap_properties, D3D12_HEAP_FLAG_NONE, &resource_desc, state_,
+          nullptr, IID_PPV_ARGS(&resource_)))) {
+    XELOGE("Failed to create a %ux%u texture for immediate drawing", width,
+           height);
+    return false;
+  }
+
+  return true;
+}
+
+void D3D12ImmediateTexture::Shutdown() {
+  if (resource_ != nullptr) {
+    resource_->Release();
+    resource_ = nullptr;
+  }
+}
+
+void D3D12ImmediateTexture::Transition(
+    D3D12_RESOURCE_STATES new_state, ID3D12GraphicsCommandList* command_list) {
+  if (resource_ == nullptr || state_ == new_state) {
+    return;
+  }
+  D3D12_RESOURCE_BARRIER barrier;
+  barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
+  barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
+  barrier.Transition.pResource = resource_;
+  barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
+  barrier.Transition.StateBefore = state_;
+  barrier.Transition.StateAfter = new_state;
+  command_list->ResourceBarrier(1, &barrier);
+  state_ = new_state;
+}
+
 D3D12ImmediateDrawer::D3D12ImmediateDrawer(D3D12Context* graphics_context)
     : ImmediateDrawer(graphics_context), context_(graphics_context) {}
 
@@ -37,6 +118,15 @@ bool D3D12ImmediateDrawer::Initialize() {
   // Create the root signature.
   D3D12_ROOT_PARAMETER root_parameters[size_t(RootParameter::kCount)];
   D3D12_DESCRIPTOR_RANGE descriptor_range_texture, descriptor_range_sampler;
+  {
+    auto& root_parameter =
+        root_parameters[size_t(RootParameter::kRestrictTextureSamples)];
+    root_parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_32BIT_CONSTANTS;
+    root_parameter.Constants.ShaderRegister = 0;
+    root_parameter.Constants.RegisterSpace = 0;
+    root_parameter.Constants.Num32BitValues = 1;
+    root_parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
+  }
   {
     auto& root_parameter = root_parameters[size_t(RootParameter::kTexture)];
     root_parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
@@ -63,15 +153,6 @@ bool D3D12ImmediateDrawer::Initialize() {
     descriptor_range_sampler.OffsetInDescriptorsFromTableStart = 0;
     root_parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
   }
-  {
-    auto& root_parameter =
-        root_parameters[size_t(RootParameter::kRestrictTextureSamples)];
-    root_parameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_32BIT_CONSTANTS;
-    root_parameter.Constants.ShaderRegister = 0;
-    root_parameter.Constants.RegisterSpace = 0;
-    root_parameter.Constants.Num32BitValues = 1;
-    root_parameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL;
-  }
   {
     auto& root_parameter =
         root_parameters[size_t(RootParameter::kViewportInvSize)];
@@ -89,13 +170,22 @@ bool D3D12ImmediateDrawer::Initialize() {
   root_signature_desc.Flags =
       D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT;
   ID3DBlob* root_signature_blob;
-  if (FAILED(D3D12SerializeRootSignature(&root_signature_desc,
+  ID3DBlob* root_signature_error_blob = nullptr;
-                                         D3D_ROOT_SIGNATURE_VERSION_1,
+  if (FAILED(D3D12SerializeRootSignature(
-                                         &root_signature_blob, nullptr))) {
+          &root_signature_desc, D3D_ROOT_SIGNATURE_VERSION_1,
+          &root_signature_blob, &root_signature_error_blob))) {
     XELOGE("Failed to serialize immediate drawer root signature");
+    if (root_signature_error_blob != nullptr) {
+      XELOGE("%s", reinterpret_cast<const char*>(
+                       root_signature_error_blob->GetBufferPointer()));
+      root_signature_error_blob->Release();
+    }
     Shutdown();
     return false;
   }
+  if (root_signature_error_blob != nullptr) {
+    root_signature_error_blob->Release();
+  }
   if (FAILED(device->CreateRootSignature(
           0, root_signature_blob->GetBufferPointer(),
           root_signature_blob->GetBufferSize(),
@@ -107,6 +197,58 @@ bool D3D12ImmediateDrawer::Initialize() {
   }
   root_signature_blob->Release();
 
+  // Create the pipelines.
+  D3D12_GRAPHICS_PIPELINE_STATE_DESC pipeline_desc = {};
+  pipeline_desc.pRootSignature = root_signature_;
+  pipeline_desc.VS.pShaderBytecode = immediate_vs;
+  pipeline_desc.VS.BytecodeLength = sizeof(immediate_vs);
+  pipeline_desc.PS.pShaderBytecode = immediate_ps;
+  pipeline_desc.PS.BytecodeLength = sizeof(immediate_ps);
+  D3D12_RENDER_TARGET_BLEND_DESC& pipeline_blend_desc =
+      pipeline_desc.BlendState.RenderTarget[0];
+  pipeline_blend_desc.BlendEnable = TRUE;
+  pipeline_blend_desc.SrcBlend = D3D12_BLEND_SRC_ALPHA;
+  pipeline_blend_desc.DestBlend = D3D12_BLEND_INV_SRC_ALPHA;
+  pipeline_blend_desc.BlendOp = D3D12_BLEND_OP_ADD;
+  pipeline_blend_desc.SrcBlendAlpha = D3D12_BLEND_SRC_ALPHA;
+  pipeline_blend_desc.DestBlendAlpha = D3D12_BLEND_INV_SRC_ALPHA;
+  pipeline_blend_desc.BlendOpAlpha = D3D12_BLEND_OP_ADD;
+  pipeline_blend_desc.RenderTargetWriteMask = D3D12_COLOR_WRITE_ENABLE_ALL;
+  pipeline_desc.SampleMask = UINT_MAX;
+  pipeline_desc.RasterizerState.FillMode = D3D12_FILL_MODE_SOLID;
+  pipeline_desc.RasterizerState.CullMode = D3D12_CULL_MODE_BACK;
+  pipeline_desc.RasterizerState.DepthClipEnable = TRUE;
+  D3D12_INPUT_ELEMENT_DESC pipeline_input_elements[3] = {};
+  pipeline_input_elements[0].SemanticName = "POSITION";
+  pipeline_input_elements[0].Format = DXGI_FORMAT_R32G32_FLOAT;
+  pipeline_input_elements[0].AlignedByteOffset = 0;
+  pipeline_input_elements[1].SemanticName = "TEXCOORD";
+  pipeline_input_elements[1].Format = DXGI_FORMAT_R32G32_FLOAT;
+  pipeline_input_elements[1].AlignedByteOffset = 8;
+  pipeline_input_elements[2].SemanticName = "COLOR";
+  pipeline_input_elements[2].Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+  pipeline_input_elements[2].AlignedByteOffset = 16;
+  pipeline_desc.InputLayout.pInputElementDescs = pipeline_input_elements;
+  pipeline_desc.InputLayout.NumElements =
+      UINT(xe::countof(pipeline_input_elements));
+  pipeline_desc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE;
+  pipeline_desc.NumRenderTargets = 1;
+  pipeline_desc.RTVFormats[0] = D3D12Context::kSwapChainFormat;
+  pipeline_desc.SampleDesc.Count = 1;
+  if (FAILED(device->CreateGraphicsPipelineState(
+          &pipeline_desc, IID_PPV_ARGS(&pipeline_triangle_)))) {
+    XELOGE("Failed to create immediate drawer triangle pipeline state");
+    Shutdown();
+    return false;
+  }
+  pipeline_desc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_LINE;
+  if (FAILED(device->CreateGraphicsPipelineState(
+          &pipeline_desc, IID_PPV_ARGS(&pipeline_line_)))) {
+    XELOGE("Failed to create immediate drawer line pipeline state");
+    Shutdown();
+    return false;
+  }
+
   // Create the samplers.
   D3D12_DESCRIPTOR_HEAP_DESC sampler_heap_desc;
   sampler_heap_desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER;
@@ -160,6 +302,12 @@ bool D3D12ImmediateDrawer::Initialize() {
                        uint32_t(SamplerIndex::kLinearRepeat) * sampler_size;
   device->CreateSampler(&sampler_desc, sampler_handle);
 
+  // Create pools for draws.
+  vertex_buffer_pool_ =
+      std::make_unique<UploadBufferPool>(context_, 2 * 1024 * 1024);
+  texture_descriptor_pool_ = std::make_unique<DescriptorHeapPool>(
+      context_, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV, 2048);
+
   // Reset the current state.
   current_command_list_ = nullptr;
 
@@ -168,15 +316,32 @@ bool D3D12ImmediateDrawer::Initialize() {
 
 void D3D12ImmediateDrawer::Shutdown() {
   for (auto& texture_upload : texture_uploads_submitted_) {
-    texture_upload.data_resource->Release();
+    texture_upload.buffer->Release();
   }
   texture_uploads_submitted_.clear();
 
+  for (auto& texture_upload : texture_uploads_pending_) {
+    texture_upload.buffer->Release();
+  }
+  texture_uploads_pending_.clear();
+
+  texture_descriptor_pool_.reset();
+  vertex_buffer_pool_.reset();
+
   if (sampler_heap_ != nullptr) {
     sampler_heap_->Release();
     sampler_heap_ = nullptr;
   }
 
+  if (pipeline_line_ != nullptr) {
+    pipeline_line_->Release();
+    pipeline_line_ = nullptr;
+  }
+  if (pipeline_triangle_ != nullptr) {
+    pipeline_triangle_->Release();
+    pipeline_triangle_ = nullptr;
+  }
+
   if (root_signature_ != nullptr) {
     root_signature_->Release();
     root_signature_ = nullptr;
@@ -186,22 +351,112 @@ void D3D12ImmediateDrawer::Shutdown() {
 std::unique_ptr<ImmediateTexture> D3D12ImmediateDrawer::CreateTexture(
     uint32_t width, uint32_t height, ImmediateTextureFilter filter, bool repeat,
     const uint8_t* data) {
-  // TODO(Triang3l): Implement CreateTexture.
+  auto texture =
-  auto texture = std::make_unique<D3D12ImmediateTexture>(width, height);
+      std::make_unique<D3D12ImmediateTexture>(width, height, filter, repeat);
+  texture->Initialize(context_->GetD3D12Provider()->GetDevice());
+  if (data != nullptr) {
+    UpdateTexture(texture.get(), data);
+  }
   return std::unique_ptr<ImmediateTexture>(texture.release());
 }
 
 void D3D12ImmediateDrawer::UpdateTexture(ImmediateTexture* texture,
                                          const uint8_t* data) {
-  // TODO(Triang3l): Implement UpdateTexture.
+  D3D12ImmediateTexture* d3d_texture =
+      static_cast<D3D12ImmediateTexture*>(texture);
+  ID3D12Resource* texture_resource = d3d_texture->GetResource();
+  if (texture_resource == nullptr) {
+    return;
+  }
+  uint32_t width = d3d_texture->width, height = d3d_texture->height;
+
+  auto device = context_->GetD3D12Provider()->GetDevice();
+
+  // Create and fill the upload buffer.
+  D3D12_RESOURCE_DESC texture_desc = texture_resource->GetDesc();
+  D3D12_PLACED_SUBRESOURCE_FOOTPRINT upload_footprint;
+  UINT64 upload_size;
+  device->GetCopyableFootprints(&texture_desc, 0, 1, 0, &upload_footprint,
+                                nullptr, nullptr, &upload_size);
+  D3D12_HEAP_PROPERTIES heap_properties = {};
+  heap_properties.Type = D3D12_HEAP_TYPE_UPLOAD;
+  D3D12_RESOURCE_DESC buffer_desc;
+  buffer_desc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER;
+  buffer_desc.Alignment = 0;
+  buffer_desc.Width = upload_size;
+  buffer_desc.Height = 1;
+  buffer_desc.DepthOrArraySize = 1;
+  buffer_desc.MipLevels = 1;
+  buffer_desc.Format = DXGI_FORMAT_UNKNOWN;
+  buffer_desc.SampleDesc.Count = 1;
+  buffer_desc.SampleDesc.Quality = 0;
+  buffer_desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
+  buffer_desc.Flags = D3D12_RESOURCE_FLAG_NONE;
+  ID3D12Resource* buffer;
+  if (FAILED(device->CreateCommittedResource(
+          &heap_properties, D3D12_HEAP_FLAG_NONE, &buffer_desc,
+          D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&buffer)))) {
+    XELOGE(
+        "Failed to create an upload buffer for a %ux%u texture for "
+        "immediate drawing",
+        width, height);
+    return;
+  }
+  D3D12_RANGE buffer_read_range;
+  buffer_read_range.Begin = 0;
+  buffer_read_range.End = 0;
+  void* buffer_mapping;
+  if (FAILED(buffer->Map(0, &buffer_read_range, &buffer_mapping))) {
+    XELOGE(
+        "Failed to map an upload buffer for a %ux%u texture for immediate "
+        "drawing",
+        width, height);
+    buffer->Release();
+    return;
+  }
+  uint8_t* buffer_row =
+      reinterpret_cast<uint8_t*>(buffer_mapping) + upload_footprint.Offset;
+  for (uint32_t i = 0; i < height; ++i) {
+    std::memcpy(buffer_row, data, width * 4);
+    data += width * 4;
+    buffer_row += upload_footprint.Footprint.RowPitch;
+  }
+  buffer->Unmap(0, nullptr);
+
+  if (current_command_list_ != nullptr) {
+    // Upload the texture right now if we can.
+    d3d_texture->Transition(D3D12_RESOURCE_STATE_COPY_DEST,
+                            current_command_list_);
+    D3D12_TEXTURE_COPY_LOCATION location_source, location_dest;
+    location_source.pResource = buffer;
+    location_source.Type = D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT;
+    location_source.PlacedFootprint = upload_footprint;
+    location_dest.pResource = texture_resource;
+    location_dest.Type = D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX;
+    location_dest.SubresourceIndex = 0;
+    current_command_list_->CopyTextureRegion(&location_dest, 0, 0, 0,
+                                             &location_source, nullptr);
+    SubmittedTextureUpload submitted_upload;
+    submitted_upload.buffer = buffer;
+    submitted_upload.frame = context_->GetCurrentFrame();
+    texture_uploads_submitted_.push_back(submitted_upload);
+  } else {
+    // Defer uploading to the next frame when there's a command list.
+    PendingTextureUpload pending_upload;
+    pending_upload.texture = texture;
+    pending_upload.buffer = buffer;
+    texture_uploads_pending_.push_back(pending_upload);
+  }
 }
 
 void D3D12ImmediateDrawer::Begin(int render_target_width,
                                  int render_target_height) {
+  auto device = context_->GetD3D12Provider()->GetDevice();
+
   // Use the compositing command list.
   current_command_list_ = context_->GetSwapCommandList();
 
-  uint32_t queue_frame = context_->GetCurrentQueueFrame();
+  uint64_t current_frame = context_->GetCurrentFrame();
   uint64_t last_completed_frame = context_->GetLastCompletedFrame();
 
   // Remove temporary buffers for completed texture uploads.
@@ -212,26 +467,261 @@ void D3D12ImmediateDrawer::Begin(int render_target_width,
       ++erase_uploads_end;
       break;
     }
-    erase_uploads_end->data_resource->Release();
+    erase_uploads_end->buffer->Release();
     ++erase_uploads_end;
   }
   texture_uploads_submitted_.erase(texture_uploads_submitted_.begin(),
                                    erase_uploads_end);
+
+  // Submit texture updates that happened between frames.
+  while (!texture_uploads_pending_.empty()) {
+    const PendingTextureUpload& pending_upload =
+        texture_uploads_pending_.back();
+    D3D12ImmediateTexture* texture =
+        static_cast<D3D12ImmediateTexture*>(pending_upload.texture);
+    texture->Transition(D3D12_RESOURCE_STATE_COPY_DEST, current_command_list_);
+    ID3D12Resource* texture_resource = texture->GetResource();
+    D3D12_RESOURCE_DESC texture_desc = texture_resource->GetDesc();
+    D3D12_TEXTURE_COPY_LOCATION location_source, location_dest;
+    location_source.pResource = pending_upload.buffer;
+    location_source.Type = D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT;
+    device->GetCopyableFootprints(&texture_desc, 0, 1, 0,
+                                  &location_source.PlacedFootprint, nullptr,
+                                  nullptr, nullptr);
+    location_dest.pResource = texture_resource;
+    location_dest.Type = D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX;
+    location_dest.SubresourceIndex = 0;
+    current_command_list_->CopyTextureRegion(&location_dest, 0, 0, 0,
+                                             &location_source, nullptr);
+    SubmittedTextureUpload submitted_upload;
+    submitted_upload.buffer = pending_upload.buffer;
+    submitted_upload.frame = current_frame;
+    texture_uploads_submitted_.push_back(submitted_upload);
+    texture_uploads_pending_.pop_back();
+  }
+
+  vertex_buffer_pool_->BeginFrame();
+  texture_descriptor_pool_->BeginFrame();
+  texture_descriptor_pool_full_update_ = 0;
+
+  current_render_target_width_ = render_target_width;
+  current_render_target_height_ = render_target_height;
+  D3D12_VIEWPORT viewport;
+  viewport.TopLeftX = 0.0f;
+  viewport.TopLeftY = 0.0f;
+  viewport.Width = float(render_target_width);
+  viewport.Height = float(render_target_height);
+  viewport.MinDepth = 0.0f;
+  viewport.MaxDepth = 1.0f;
+  current_command_list_->RSSetViewports(1, &viewport);
+
+  current_command_list_->SetGraphicsRootSignature(root_signature_);
+  float viewport_inv_scale[2];
+  viewport_inv_scale[0] = 1.0f / viewport.Width;
+  viewport_inv_scale[1] = 1.0f / viewport.Height;
+  current_command_list_->SetGraphicsRoot32BitConstants(
+      UINT(RootParameter::kViewportInvSize), 2, viewport_inv_scale, 0);
 }
 
 void D3D12ImmediateDrawer::BeginDrawBatch(const ImmediateDrawBatch& batch) {
-  // TODO(Triang3l): Implement BeginDrawBatch.
+  assert_not_null(current_command_list_);
+  if (current_command_list_ == nullptr) {
+    return;
+  }
+
+  batch_open_ = false;
+
+  // Bind the vertices.
+  D3D12_VERTEX_BUFFER_VIEW vertex_buffer_view;
+  vertex_buffer_view.StrideInBytes = UINT(sizeof(ImmediateVertex));
+  vertex_buffer_view.SizeInBytes =
+      batch.vertex_count * uint32_t(sizeof(ImmediateVertex));
+  void* vertex_buffer_mapping = vertex_buffer_pool_->RequestFull(
+      vertex_buffer_view.SizeInBytes, nullptr, nullptr,
+      &vertex_buffer_view.BufferLocation);
+  if (vertex_buffer_mapping == nullptr) {
+    XELOGE("Failed to get a buffer for %u vertices in the immediate drawer",
+           batch.vertex_count);
+    return;
+  }
+  std::memcpy(vertex_buffer_mapping, batch.vertices,
+              vertex_buffer_view.SizeInBytes);
+  current_command_list_->IASetVertexBuffers(0, 1, &vertex_buffer_view);
+
+  // Bind the indices.
+  batch_has_index_buffer_ = batch.indices != nullptr;
+  if (batch_has_index_buffer_) {
+    D3D12_INDEX_BUFFER_VIEW index_buffer_view;
+    index_buffer_view.SizeInBytes = batch.index_count * sizeof(uint16_t);
+    index_buffer_view.Format = DXGI_FORMAT_R16_UINT;
+    void* index_buffer_mapping = vertex_buffer_pool_->RequestFull(
+        index_buffer_view.SizeInBytes, nullptr, nullptr,
+        &index_buffer_view.BufferLocation);
+    if (index_buffer_mapping == nullptr) {
+      XELOGE("Failed to get a buffer for %u indices in the immediate drawer",
+             batch.index_count);
+      return;
+    }
+    std::memcpy(index_buffer_mapping, batch.indices,
+                index_buffer_view.SizeInBytes);
+    current_command_list_->IASetIndexBuffer(&index_buffer_view);
+  }
+
+  batch_open_ = true;
+  current_primitive_topology_ = D3D_PRIMITIVE_TOPOLOGY_UNDEFINED;
+  current_texture_ = nullptr;
+  current_sampler_index_ = SamplerIndex::kInvalid;
 }
 
 void D3D12ImmediateDrawer::Draw(const ImmediateDraw& draw) {
-  // TODO(Triang3l): Implement Draw.
+  assert_not_null(current_command_list_);
+  if (current_command_list_ == nullptr) {
+    return;
+  }
+
+  if (!batch_open_) {
+    // Could be an error while obtaining the vertex and index buffers.
+    return;
+  }
+
+  auto provider = context_->GetD3D12Provider();
+  auto device = provider->GetDevice();
+
+  // Bind the texture.
+  auto texture = reinterpret_cast<D3D12ImmediateTexture*>(draw.texture_handle);
+  ID3D12Resource* texture_resource;
+  if (texture != nullptr) {
+    texture->Transition(D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE,
+                        current_command_list_);
+    texture_resource = texture->GetResource();
+  } else {
+    texture_resource = nullptr;
+  }
+  bool bind_texture = current_texture_ != texture;
+  uint32_t texture_descriptor_index;
+  uint64_t texture_full_update = texture_descriptor_pool_->Request(
+      texture_descriptor_pool_full_update_, bind_texture ? 1 : 0, 1,
+      texture_descriptor_index);
+  if (texture_full_update == 0) {
+    return;
+  }
+  if (texture_descriptor_pool_full_update_ != texture_full_update) {
+    bind_texture = true;
+    texture_descriptor_pool_full_update_ = texture_full_update;
+    ID3D12DescriptorHeap* descriptor_heaps[] = {
+        texture_descriptor_pool_->GetLastRequestHeap(), sampler_heap_};
+    current_command_list_->SetDescriptorHeaps(2, descriptor_heaps);
+  }
+  if (bind_texture) {
+    auto descriptor_size_view = provider->GetDescriptorSizeView();
+    D3D12_SHADER_RESOURCE_VIEW_DESC texture_view_desc;
+    texture_view_desc.Format = D3D12ImmediateTexture::kFormat;
+    texture_view_desc.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+    texture_view_desc.Shader4ComponentMapping =
+        D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+    texture_view_desc.Texture2D.MostDetailedMip = 0;
+    texture_view_desc.Texture2D.MipLevels = 1;
+    texture_view_desc.Texture2D.PlaneSlice = 0;
+    texture_view_desc.Texture2D.ResourceMinLODClamp = 0.0f;
+    D3D12_CPU_DESCRIPTOR_HANDLE texture_view_cpu_handle;
+    texture_view_cpu_handle.ptr =
+        texture_descriptor_pool_->GetLastRequestHeapCPUStart().ptr +
+        texture_descriptor_index * descriptor_size_view;
+    device->CreateShaderResourceView(texture_resource, &texture_view_desc,
+                                     texture_view_cpu_handle);
+    D3D12_GPU_DESCRIPTOR_HANDLE texture_view_gpu_handle;
+    texture_view_gpu_handle.ptr =
+        texture_descriptor_pool_->GetLastRequestHeapGPUStart().ptr +
+        texture_descriptor_index * descriptor_size_view;
+    current_command_list_->SetGraphicsRootDescriptorTable(
+        UINT(RootParameter::kTexture), texture_view_gpu_handle);
+    current_texture_ = texture;
+  }
+
+  // Bind the sampler.
+  SamplerIndex sampler_index;
+  if (texture != nullptr) {
+    if (texture->GetFilter() == ImmediateTextureFilter::kLinear) {
+      sampler_index = texture->IsRepeated() ? SamplerIndex::kLinearRepeat
+                                            : SamplerIndex::kLinearClamp;
+    } else {
+      sampler_index = texture->IsRepeated() ? SamplerIndex::kNearestRepeat
+                                            : SamplerIndex::kNearestClamp;
+    }
+  } else {
+    sampler_index = SamplerIndex::kNearestClamp;
+  }
+  if (current_sampler_index_ != sampler_index) {
+    D3D12_GPU_DESCRIPTOR_HANDLE sampler_gpu_handle;
+    sampler_gpu_handle.ptr =
+        sampler_heap_gpu_start_.ptr +
+        UINT(sampler_index) * provider->GetDescriptorSizeSampler();
+    current_command_list_->SetGraphicsRootDescriptorTable(
+        UINT(RootParameter::kSampler), sampler_gpu_handle);
+    current_sampler_index_ = sampler_index;
+  }
+
+  // Set whether texture coordinates need to be restricted.
+  uint32_t restrict_texture_samples = draw.restrict_texture_samples ? 1 : 0;
+  current_command_list_->SetGraphicsRoot32BitConstants(
+      UINT(RootParameter::kRestrictTextureSamples), 1,
+      &restrict_texture_samples, 0);
+
+  // Set the primitive type and the pipeline for it.
+  D3D_PRIMITIVE_TOPOLOGY primitive_topology;
+  ID3D12PipelineState* pipeline;
+  switch (draw.primitive_type) {
+    case ImmediatePrimitiveType::kLines:
+      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_LINELIST;
+      pipeline = pipeline_line_;
+      break;
+    case ImmediatePrimitiveType::kTriangles:
+      primitive_topology = D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST;
+      pipeline = pipeline_triangle_;
+      break;
+    default:
+      assert_unhandled_case(draw.primitive_type);
+      return;
+  }
+  if (current_primitive_topology_ != primitive_topology) {
+    current_command_list_->IASetPrimitiveTopology(primitive_topology);
+    current_command_list_->SetPipelineState(pipeline);
+    current_primitive_topology_ = primitive_topology;
+  }
+
+  // Set the scissor rectangle if enabled.
+  D3D12_RECT scissor;
+  if (draw.scissor) {
+    scissor.left = draw.scissor_rect[0];
+    scissor.top = current_render_target_height_ -
+                  (draw.scissor_rect[1] + draw.scissor_rect[3]);
+    scissor.right = scissor.left + draw.scissor_rect[2];
+    scissor.bottom = scissor.top + draw.scissor_rect[3];
+  } else {
+    scissor.left = 0;
+    scissor.top = 0;
+    scissor.right = current_render_target_width_;
+    scissor.bottom = current_render_target_height_;
+  }
+  current_command_list_->RSSetScissorRects(1, &scissor);
+
+  // Draw.
+  if (batch_has_index_buffer_) {
+    current_command_list_->DrawIndexedInstanced(
+        draw.count, 1, draw.index_offset, draw.base_vertex, 0);
+  } else {
+    current_command_list_->DrawInstanced(draw.count, 1, draw.base_vertex, 0);
+  }
 }
 
-void D3D12ImmediateDrawer::EndDrawBatch() {
+void D3D12ImmediateDrawer::EndDrawBatch() { batch_open_ = false; }
-  // TODO(Triang3l): Implement EndDrawBatch.
-}
 
-void D3D12ImmediateDrawer::End() { current_command_list_ = nullptr; }
+void D3D12ImmediateDrawer::End() {
+  texture_descriptor_pool_->EndFrame();
+  vertex_buffer_pool_->EndFrame();
+
+  current_command_list_ = nullptr;
+}
 
 }  // namespace d3d12
 }  // namespace ui

src/xenia/ui/d3d12/d3d12_immediate_drawer.h

@@ -12,10 +12,12 @@
 
 #include <deque>
 #include <memory>
+#include <vector>
 
 #include "xenia/ui/d3d12/command_list.h"
 #include "xenia/ui/d3d12/d3d12_api.h"
 #include "xenia/ui/d3d12/d3d12_context.h"
+#include "xenia/ui/d3d12/pools.h"
 #include "xenia/ui/immediate_drawer.h"
 
 namespace xe {
@@ -48,33 +50,53 @@ class D3D12ImmediateDrawer : public ImmediateDrawer {
 
   ID3D12RootSignature* root_signature_ = nullptr;
   enum class RootParameter {
+    kRestrictTextureSamples,
     kTexture,
     kSampler,
-    kRestrictTextureSamples,
     kViewportInvSize,
 
     kCount
   };
 
+  ID3D12PipelineState* pipeline_triangle_ = nullptr;
+  ID3D12PipelineState* pipeline_line_ = nullptr;
+
   enum class SamplerIndex {
     kNearestClamp,
     kLinearClamp,
     kNearestRepeat,
     kLinearRepeat,
 
-    kCount
+    kCount,
+    kInvalid = kCount
   };
   ID3D12DescriptorHeap* sampler_heap_ = nullptr;
   D3D12_CPU_DESCRIPTOR_HANDLE sampler_heap_cpu_start_;
   D3D12_GPU_DESCRIPTOR_HANDLE sampler_heap_gpu_start_;
 
-  ID3D12GraphicsCommandList* current_command_list_ = nullptr;
+  std::unique_ptr<UploadBufferPool> vertex_buffer_pool_ = nullptr;
+  std::unique_ptr<DescriptorHeapPool> texture_descriptor_pool_ = nullptr;
+
+  struct PendingTextureUpload {
+    ImmediateTexture* texture;
+    ID3D12Resource* buffer;
+  };
+  std::vector<PendingTextureUpload> texture_uploads_pending_;
 
   struct SubmittedTextureUpload {
-    ID3D12Resource* data_resource;
+    ID3D12Resource* buffer;
     uint64_t frame;
   };
   std::deque<SubmittedTextureUpload> texture_uploads_submitted_;
+
+  ID3D12GraphicsCommandList* current_command_list_ = nullptr;
+  int current_render_target_width_, current_render_target_height_;
+  bool batch_open_ = false;
+  bool batch_has_index_buffer_;
+  uint64_t texture_descriptor_pool_full_update_;
+  D3D_PRIMITIVE_TOPOLOGY current_primitive_topology_;
+  ImmediateTexture* current_texture_;
+  SamplerIndex current_sampler_index_;
 };
 
 }  // namespace d3d12

src/xenia/ui/d3d12/shaders/immediate.ps.hlsl

@@ -1,16 +1,16 @@
-Texture2D<float4> immediate_texture : register(t0);
+Texture2D<float4> xe_immediate_texture : register(t0);
-SamplerState immediate_sampler : register(s0);
+SamplerState xe_immediate_sampler : register(s0);
-bool restrict_texture_samples : register(b0);
+bool xe_restrict_texture_samples : register(b0);
 
-struct ps_input {
+struct XePixelShaderInput {
-  float2 uv : TEXCOORD0;
+  float2 texcoord : TEXCOORD0;
   float4 color : TEXCOORD1;
 };
 
-float4 main(ps_input input) : SV_Target {
+float4 main(XePixelShaderInput input) : SV_Target {
   float4 output = input.color;
-  if (!restrict_texture_samples || input.uv.x <= 1.0) {
+  if (!xe_restrict_texture_samples || input.texcoord.x <= 1.0) {
-    output *= immediate_texture.Sample(immediate_sampler, input.uv);
+    output *= xe_immediate_texture.Sample(xe_immediate_sampler, input.texcoord);
   }
   return output;
 }

src/xenia/ui/d3d12/shaders/immediate.vs.hlsl

@@ -1,21 +1,23 @@
-float2 viewport_inv_size : register(b0);
+float2 xe_viewport_inv_size : register(b0);
 
-struct vs_input {
+struct XeVertexShaderInput {
-  float2 pos : POSITION;
+  float2 position : POSITION;
-  float2 uv : TEXCOORD;
+  float2 texcoord : TEXCOORD;
   float4 color : COLOR;
 };
 
-struct vs_output {
+struct XeVertexShaderOutput {
-  float4 pos : SV_Position;
+  float2 texcoord : TEXCOORD0;
-  float2 uv : TEXCOORD0;
   float4 color : TEXCOORD1;
+  float4 position : SV_Position;
 };
 
-vs_output main(vs_input input) {
+XeVertexShaderOutput main(XeVertexShaderInput input) {
-  vs_output output;
+  XeVertexShaderOutput output;
-  output.pos = float4(viewport_inv_size * input.pos, 0.0, 1.0);
+  output.position = float4(
-  output.uv = input.uv;
+      input.position * xe_viewport_inv_size * float2(2.0, -2.0) +
+      float2(-1.0, 1.0), 0.0, 1.0);
+  output.texcoord = input.texcoord;
   output.color = input.color;
   return output;
 }