Merge pull request #3813 from degasus/null_video

Null: Initial release of null video backend

Source/Core/Core/CMakeLists.txt

@@ -233,6 +233,7 @@ set(LIBS
 	${LZO}
 	sfml-network
 	sfml-system
+	videonull
 	videoogl
 	videosoftware
 	z

Source/Core/DolphinWX/DolphinWX.vcxproj

@@ -230,6 +230,9 @@
     <ProjectReference Include="$(CoreDir)VideoBackends\Software\Software.vcxproj">
       <Project>{a4c423aa-f57c-46c7-a172-d1a777017d29}</Project>
     </ProjectReference>
+    <ProjectReference Include="$(CoreDir)VideoBackends\Null\Null.vcxproj">
+      <Project>{53A5391B-737E-49A8-BC8F-312ADA00736F}</Project>
+    </ProjectReference>
     <ProjectReference Include="$(CoreDir)VideoCommon\VideoCommon.vcxproj">
       <Project>{3de9ee35-3e91-4f27-a014-2866ad8c3fe3}</Project>
     </ProjectReference>

Source/Core/DolphinWX/Main.cpp

@@ -558,15 +558,14 @@ void Host_ConnectWiimote(int wm_idx, bool connect)
 void Host_ShowVideoConfig(void* parent, const std::string& backend_name,
                           const std::string& config_name)
 {
-  if (backend_name == "Direct3D 11" || backend_name == "Direct3D 12 (experimental)" ||
+  if (backend_name == "Software Renderer")
-      backend_name == "OpenGL")
-  {
-    VideoConfigDiag diag((wxWindow*)parent, backend_name, config_name);
-    diag.ShowModal();
-  }
-  else if (backend_name == "Software Renderer")
   {
     SoftwareVideoConfigDialog diag((wxWindow*)parent, backend_name, config_name);
     diag.ShowModal();
   }
+  else
+  {
+    VideoConfigDiag diag((wxWindow*)parent, backend_name, config_name);
+    diag.ShowModal();
+  }
 }

Source/Core/VideoBackends/CMakeLists.txt

@@ -1,3 +1,4 @@
 add_subdirectory(OGL)
+add_subdirectory(Null)
 add_subdirectory(Software)
 # TODO: Add other backends here!

Source/Core/VideoBackends/Null/CMakeLists.txt

@@ -0,0 +1,14 @@
+set(SRCS
+	NullBackend.cpp
+	Render.cpp
+	VertexManager.cpp
+	ShaderCache.cpp
+)
+
+set(LIBS
+	videocommon
+	common
+)
+
+add_dolphin_library(videonull "${SRCS}" "${LIBS}")
+

Source/Core/VideoBackends/Null/FramebufferManager.h

@@ -0,0 +1,29 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "VideoCommon/FramebufferManagerBase.h"
+
+class XFBSource : public XFBSourceBase
+{
+public:
+  void DecodeToTexture(u32 xfb_addr, u32 fb_width, u32 fb_height) override {}
+  void CopyEFB(float gamma) override {}
+};
+
+class FramebufferManager : public FramebufferManagerBase
+{
+public:
+  std::unique_ptr<XFBSourceBase> CreateXFBSource(unsigned int target_width,
+                                                 unsigned int target_height,
+                                                 unsigned int layers) override
+  {
+    return std::make_unique<XFBSource>();
+  }
+
+  void GetTargetSize(unsigned int* width, unsigned int* height) override {}
+  void CopyToRealXFB(u32 xfb_addr, u32 fb_stride, u32 fb_height, const EFBRectangle& source_rc,
+                     float gamma = 1.0f) override
+  {
+  }
+};

Source/Core/VideoBackends/Null/Null.vcxproj

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{53A5391B-737E-49A8-BC8F-312ADA00736F}</ProjectGuid>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
+    <UseDebugLibraries>true</UseDebugLibraries>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
+    <UseDebugLibraries>false</UseDebugLibraries>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\..\..\VSProps\Base.props" />
+    <Import Project="..\..\..\VSProps\PCHUse.props" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <ItemGroup>
+    <ClCompile Include="NullBackend.cpp" />
+    <ClCompile Include="Render.cpp" />
+    <ClCompile Include="ShaderCache.cpp" />
+    <ClCompile Include="VertexManager.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="FramebufferManager.h" />
+    <ClInclude Include="PerfQuery.h" />
+    <ClInclude Include="Render.h" />
+    <ClInclude Include="ShaderCache.h" />
+    <ClInclude Include="TextureCache.h" />
+    <ClInclude Include="VertexManager.h" />
+    <ClInclude Include="VideoBackend.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <Text Include="CMakeLists.txt" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="$(CoreDir)VideoCommon\VideoCommon.vcxproj">
+      <Project>{3de9ee35-3e91-4f27-a014-2866ad8c3fe3}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

Source/Core/VideoBackends/Null/NullBackend.cpp

@@ -0,0 +1,127 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+// Null Backend Documentation
+
+// This backend tries not to do anything in the backend,
+// but everything in VideoCommon.
+
+#include "Core/Host.h"
+
+#include "VideoBackends/Null/FramebufferManager.h"
+#include "VideoBackends/Null/PerfQuery.h"
+#include "VideoBackends/Null/Render.h"
+#include "VideoBackends/Null/ShaderCache.h"
+#include "VideoBackends/Null/TextureCache.h"
+#include "VideoBackends/Null/VertexManager.h"
+#include "VideoBackends/Null/VideoBackend.h"
+
+#include "VideoCommon/BPStructs.h"
+#include "VideoCommon/CommandProcessor.h"
+#include "VideoCommon/Fifo.h"
+#include "VideoCommon/IndexGenerator.h"
+#include "VideoCommon/OnScreenDisplay.h"
+#include "VideoCommon/OpcodeDecoding.h"
+#include "VideoCommon/PixelEngine.h"
+#include "VideoCommon/PixelShaderManager.h"
+#include "VideoCommon/VertexLoaderManager.h"
+#include "VideoCommon/VertexShaderManager.h"
+#include "VideoCommon/VideoBackendBase.h"
+#include "VideoCommon/VideoConfig.h"
+
+namespace Null
+{
+static void InitBackendInfo()
+{
+  g_Config.backend_info.APIType = API_NONE;
+  g_Config.backend_info.bSupportsExclusiveFullscreen = true;
+  g_Config.backend_info.bSupportsDualSourceBlend = true;
+  g_Config.backend_info.bSupportsEarlyZ = true;
+  g_Config.backend_info.bSupportsPrimitiveRestart = true;
+  g_Config.backend_info.bSupportsOversizedViewports = true;
+  g_Config.backend_info.bSupportsGeometryShaders = true;
+  g_Config.backend_info.bSupports3DVision = false;
+  g_Config.backend_info.bSupportsPostProcessing = false;
+  g_Config.backend_info.bSupportsPaletteConversion = true;
+  g_Config.backend_info.bSupportsClipControl = true;
+
+  // aamodes: We only support 1 sample, so no MSAA
+  g_Config.backend_info.AAModes = {1};
+}
+
+void VideoBackend::ShowConfig(void* parent)
+{
+  InitBackendInfo();
+  Host_ShowVideoConfig(parent, GetDisplayName(), "gfx_null");
+}
+
+bool VideoBackend::Initialize(void* window_handle)
+{
+  InitializeShared();
+  InitBackendInfo();
+
+  // Load Configs
+  g_Config.Load(File::GetUserPath(D_CONFIG_IDX) + "GFX.ini");
+  g_Config.GameIniLoad();
+  g_Config.UpdateProjectionHack();
+  g_Config.VerifyValidity();
+  UpdateActiveConfig();
+
+  // Do our OSD callbacks
+  OSD::DoCallbacks(OSD::CallbackType::Initialization);
+
+  // Initialize VideoCommon
+  CommandProcessor::Init();
+  PixelEngine::Init();
+  BPInit();
+  Fifo::Init();
+  OpcodeDecoder::Init();
+  IndexGenerator::Init();
+  VertexShaderManager::Init();
+  PixelShaderManager::Init();
+  VertexLoaderManager::Init();
+  Host_Message(WM_USER_CREATE);
+
+  return true;
+}
+
+// This is called after Initialize() from the Core
+// Run from the graphics thread
+void VideoBackend::Video_Prepare()
+{
+  g_renderer = std::make_unique<Renderer>();
+  g_vertex_manager = std::make_unique<VertexManager>();
+  g_perf_query = std::make_unique<PerfQuery>();
+  g_framebuffer_manager = std::make_unique<FramebufferManager>();
+  g_texture_cache = std::make_unique<TextureCache>();
+  VertexShaderCache::s_instance = std::make_unique<VertexShaderCache>();
+  GeometryShaderCache::s_instance = std::make_unique<GeometryShaderCache>();
+  PixelShaderCache::s_instance = std::make_unique<PixelShaderCache>();
+}
+
+void VideoBackend::Shutdown()
+{
+  // Shutdown VideoCommon
+  Fifo::Shutdown();
+  VertexLoaderManager::Shutdown();
+  VertexShaderManager::Shutdown();
+  PixelShaderManager::Shutdown();
+  OpcodeDecoder::Shutdown();
+
+  // Do our OSD callbacks
+  OSD::DoCallbacks(OSD::CallbackType::Shutdown);
+}
+
+void VideoBackend::Video_Cleanup()
+{
+  PixelShaderCache::s_instance.reset();
+  VertexShaderCache::s_instance.reset();
+  GeometryShaderCache::s_instance.reset();
+  g_texture_cache.reset();
+  g_perf_query.reset();
+  g_vertex_manager.reset();
+  g_framebuffer_manager.reset();
+  g_renderer.reset();
+}
+}

Source/Core/VideoBackends/Null/PerfQuery.h

@@ -0,0 +1,24 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/PerfQueryBase.h"
+
+namespace Null
+{
+class PerfQuery : public PerfQueryBase
+{
+public:
+  PerfQuery() {}
+  ~PerfQuery() override {}
+  void EnableQuery(PerfQueryGroup type) override {}
+  void DisableQuery(PerfQueryGroup type) override {}
+  void ResetQuery() override {}
+  u32 GetQueryResult(PerfQueryType type) override { return 0; }
+  void FlushResults() override {}
+  bool IsFlushed() const { return true; }
+};
+
+}  // namespace

Source/Core/VideoBackends/Null/Render.cpp

@@ -0,0 +1,46 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "Common/Logging/Log.h"
+
+#include "VideoBackends/Null/Render.h"
+
+#include "VideoCommon/VideoConfig.h"
+
+namespace Null
+{
+// Init functions
+Renderer::Renderer()
+{
+  g_Config.bRunning = true;
+  UpdateActiveConfig();
+}
+
+Renderer::~Renderer()
+{
+  g_Config.bRunning = false;
+  UpdateActiveConfig();
+}
+
+void Renderer::RenderText(const std::string& text, int left, int top, u32 color)
+{
+  NOTICE_LOG(VIDEO, "RenderText: %s\n", text.c_str());
+}
+
+TargetRectangle Renderer::ConvertEFBRectangle(const EFBRectangle& rc)
+{
+  TargetRectangle result;
+  result.left = rc.left;
+  result.top = rc.top;
+  result.right = rc.right;
+  result.bottom = rc.bottom;
+  return result;
+}
+
+void Renderer::SwapImpl(u32, u32, u32, u32, const EFBRectangle&, float)
+{
+  UpdateActiveConfig();
+}
+
+}  // namespace Null

Source/Core/VideoBackends/Null/Render.h

@@ -0,0 +1,39 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/RenderBase.h"
+
+namespace Null
+{
+class Renderer : public ::Renderer
+{
+public:
+  Renderer();
+  ~Renderer();
+
+  void RenderText(const std::string& pstr, int left, int top, u32 color) override;
+  u32 AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data) override { return 0; }
+  void PokeEFB(EFBAccessType type, const EfbPokeData* points, size_t num_points) override {}
+  u16 BBoxRead(int index) override { return 0; }
+  void BBoxWrite(int index, u16 value) override {}
+  int GetMaxTextureSize() override { return 16 * 1024; }
+  TargetRectangle ConvertEFBRectangle(const EFBRectangle& rc) override;
+
+  void SwapImpl(u32 xfb_addr, u32 fb_width, u32 fb_stride, u32 fb_height, const EFBRectangle& rc,
+                float gamma) override;
+
+  void ClearScreen(const EFBRectangle& rc, bool colorEnable, bool alphaEnable, bool zEnable,
+                   u32 color, u32 z) override
+  {
+  }
+
+  void ReinterpretPixelData(unsigned int convtype) override {}
+  bool SaveScreenshot(const std::string& filename, const TargetRectangle& rc) override
+  {
+    return false;
+  }
+};
+}

Source/Core/VideoBackends/Null/ShaderCache.cpp

@@ -0,0 +1,76 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "VideoBackends/Null/ShaderCache.h"
+
+#include "VideoCommon/Debugger.h"
+#include "VideoCommon/Statistics.h"
+
+namespace Null
+{
+template <typename Uid>
+ShaderCache<Uid>::ShaderCache()
+{
+  Clear();
+
+  SETSTAT(stats.numPixelShadersCreated, 0);
+  SETSTAT(stats.numPixelShadersAlive, 0);
+}
+
+template <typename Uid>
+ShaderCache<Uid>::~ShaderCache()
+{
+  Clear();
+}
+
+template <typename Uid>
+void ShaderCache<Uid>::Clear()
+{
+  m_shaders.clear();
+  m_last_entry = nullptr;
+}
+
+template <typename Uid>
+bool ShaderCache<Uid>::SetShader(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type)
+{
+  Uid uid = GetUid(dst_alpha_mode, primitive_type, API_OPENGL);
+
+  // Check if the shader is already set
+  if (m_last_entry)
+  {
+    if (uid == m_last_uid)
+    {
+      return true;
+    }
+  }
+
+  m_last_uid = uid;
+
+  // Check if the shader is already in the cache
+  auto iter = m_shaders.find(uid);
+  if (iter != m_shaders.end())
+  {
+    const std::string& entry = iter->second;
+    m_last_entry = &entry;
+
+    GFX_DEBUGGER_PAUSE_AT(NEXT_PIXEL_SHADER_CHANGE, true);
+    return true;
+  }
+
+  // Need to compile a new shader
+  ShaderCode code = GenerateCode(dst_alpha_mode, primitive_type, API_OPENGL);
+  m_shaders.emplace(uid, code.GetBuffer());
+
+  GFX_DEBUGGER_PAUSE_AT(NEXT_PIXEL_SHADER_CHANGE, true);
+  return true;
+}
+
+template class ShaderCache<VertexShaderUid>;
+template class ShaderCache<GeometryShaderUid>;
+template class ShaderCache<PixelShaderUid>;
+
+std::unique_ptr<VertexShaderCache> VertexShaderCache::s_instance;
+std::unique_ptr<GeometryShaderCache> GeometryShaderCache::s_instance;
+std::unique_ptr<PixelShaderCache> PixelShaderCache::s_instance;
+}

Source/Core/VideoBackends/Null/ShaderCache.h

@@ -0,0 +1,93 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <memory>
+
+#include "VideoCommon/GeometryShaderGen.h"
+#include "VideoCommon/PixelShaderGen.h"
+#include "VideoCommon/VertexShaderGen.h"
+#include "VideoCommon/VideoCommon.h"
+
+namespace Null
+{
+template <typename Uid>
+class ShaderCache
+{
+public:
+  ShaderCache();
+  virtual ~ShaderCache();
+
+  void Clear();
+  bool SetShader(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type);
+
+protected:
+  virtual Uid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type, API_TYPE api_type) = 0;
+  virtual ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                                  API_TYPE api_type) = 0;
+
+private:
+  std::map<Uid, std::string> m_shaders;
+  const std::string* m_last_entry = nullptr;
+  Uid m_last_uid;
+  UidChecker<Uid, ShaderCode> m_uid_checker;
+};
+
+class VertexShaderCache : public ShaderCache<VertexShaderUid>
+{
+public:
+  static std::unique_ptr<VertexShaderCache> s_instance;
+
+protected:
+  VertexShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                         API_TYPE api_type) override
+  {
+    return GetVertexShaderUid(api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GenerateVertexShaderCode(api_type);
+  }
+};
+
+class GeometryShaderCache : public ShaderCache<GeometryShaderUid>
+{
+public:
+  static std::unique_ptr<GeometryShaderCache> s_instance;
+
+protected:
+  GeometryShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                           API_TYPE api_type) override
+  {
+    return GetGeometryShaderUid(primitive_type, api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GenerateGeometryShaderCode(primitive_type, api_type);
+  }
+};
+
+class PixelShaderCache : public ShaderCache<PixelShaderUid>
+{
+public:
+  static std::unique_ptr<PixelShaderCache> s_instance;
+
+protected:
+  PixelShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                        API_TYPE api_type) override
+  {
+    return GetPixelShaderUid(dst_alpha_mode, api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GeneratePixelShaderCode(dst_alpha_mode, api_type);
+  }
+};
+
+}  // namespace NULL

Source/Core/VideoBackends/Null/TextureCache.h

@@ -0,0 +1,60 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/TextureCacheBase.h"
+
+namespace Null
+{
+class TextureCache : public TextureCacheBase
+{
+public:
+  TextureCache() {}
+  ~TextureCache() {}
+  void CompileShaders() override {}
+  void DeleteShaders() override {}
+  void ConvertTexture(TCacheEntryBase* entry, TCacheEntryBase* unconverted, void* palette,
+                      TlutFormat format) override
+  {
+  }
+
+  void CopyEFB(u8* dst, u32 format, u32 native_width, u32 bytes_per_row, u32 num_blocks_y,
+               u32 memory_stride, PEControl::PixelFormat src_format, const EFBRectangle& src_rect,
+               bool is_intensity, bool scale_by_half) override
+  {
+  }
+
+private:
+  struct TCacheEntry : TCacheEntryBase
+  {
+    TCacheEntry(const TCacheEntryConfig& _config) : TCacheEntryBase(_config) {}
+    ~TCacheEntry() {}
+    void Load(unsigned int width, unsigned int height, unsigned int expanded_width,
+              unsigned int level) override
+    {
+    }
+
+    void FromRenderTarget(u8* dst, PEControl::PixelFormat src_format, const EFBRectangle& src_rect,
+                          bool scale_by_half, unsigned int cbufid, const float* colmat) override
+    {
+    }
+
+    void CopyRectangleFromTexture(const TCacheEntryBase* source,
+                                  const MathUtil::Rectangle<int>& srcrect,
+                                  const MathUtil::Rectangle<int>& dstrect) override
+    {
+    }
+
+    void Bind(unsigned int stage) override {}
+    bool Save(const std::string& filename, unsigned int level) override { return false; }
+  };
+
+  TCacheEntryBase* CreateTexture(const TCacheEntryConfig& config) override
+  {
+    return new TCacheEntry(config);
+  }
+};
+
+}  // Null name space

Source/Core/VideoBackends/Null/VertexManager.cpp

@@ -0,0 +1,53 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "VideoBackends/Null/VertexManager.h"
+#include "VideoBackends/Null/ShaderCache.h"
+
+#include "VideoCommon/IndexGenerator.h"
+#include "VideoCommon/Statistics.h"
+#include "VideoCommon/VertexLoaderManager.h"
+#include "VideoCommon/VideoConfig.h"
+
+namespace Null
+{
+class NullNativeVertexFormat : public NativeVertexFormat
+{
+public:
+  NullNativeVertexFormat() {}
+  void SetupVertexPointers() override {}
+};
+
+NativeVertexFormat*
+VertexManager::CreateNativeVertexFormat(const PortableVertexDeclaration& vtx_decl)
+{
+  return new NullNativeVertexFormat;
+}
+
+VertexManager::VertexManager() : m_local_v_buffer(MAXVBUFFERSIZE), m_local_i_buffer(MAXIBUFFERSIZE)
+{
+}
+
+VertexManager::~VertexManager()
+{
+}
+
+void VertexManager::ResetBuffer(u32 stride)
+{
+  s_pCurBufferPointer = s_pBaseBufferPointer = m_local_v_buffer.data();
+  s_pEndBufferPointer = s_pCurBufferPointer + m_local_v_buffer.size();
+  IndexGenerator::Start(&m_local_i_buffer[0]);
+}
+
+void VertexManager::vFlush(bool use_dst_alpha)
+{
+  VertexShaderCache::s_instance->SetShader(
+      use_dst_alpha ? DSTALPHA_DUAL_SOURCE_BLEND : DSTALPHA_NONE, current_primitive_type);
+  GeometryShaderCache::s_instance->SetShader(
+      use_dst_alpha ? DSTALPHA_DUAL_SOURCE_BLEND : DSTALPHA_NONE, current_primitive_type);
+  PixelShaderCache::s_instance->SetShader(
+      use_dst_alpha ? DSTALPHA_DUAL_SOURCE_BLEND : DSTALPHA_NONE, current_primitive_type);
+}
+
+}  // namespace

Source/Core/VideoBackends/Null/VertexManager.h

@@ -0,0 +1,28 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "VideoCommon/VertexManagerBase.h"
+
+namespace Null
+{
+class VertexManager : public VertexManagerBase
+{
+public:
+  VertexManager();
+  ~VertexManager();
+  NativeVertexFormat* CreateNativeVertexFormat(const PortableVertexDeclaration& vtx_decl) override;
+
+protected:
+  void ResetBuffer(u32 stride) override;
+
+private:
+  void vFlush(bool use_dst_alpha) override;
+  std::vector<u8> m_local_v_buffer;
+  std::vector<u16> m_local_i_buffer;
+};
+}

Source/Core/VideoBackends/Null/VideoBackend.h

@@ -0,0 +1,25 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/VideoBackendBase.h"
+
+namespace Null
+{
+class VideoBackend : public VideoBackendBase
+{
+  bool Initialize(void* window_handle) override;
+  void Shutdown() override;
+
+  std::string GetName() const override { return "Null"; }
+  std::string GetDisplayName() const override { return "Null"; }
+  void Video_Prepare() override;
+  void Video_Cleanup() override;
+
+  void ShowConfig(void* parent) override;
+
+  unsigned int PeekMessages() override { return 0; }
+};
+}

Source/Core/VideoCommon/VideoBackendBase.cpp

@@ -12,6 +12,7 @@
 #include "VideoBackends/D3D/VideoBackend.h"
 #include "VideoBackends/D3D12/VideoBackend.h"
 #endif
+#include "VideoBackends/Null/VideoBackend.h"
 #include "VideoBackends/OGL/VideoBackend.h"
 #include "VideoBackends/Software/VideoBackend.h"
 
@@ -34,7 +35,7 @@ __declspec(dllexport) DWORD NvOptimusEnablement = 1;
 
 void VideoBackendBase::PopulateList()
 {
-  // OGL > D3D11 > D3D12 > SW
+  // OGL > D3D11 > D3D12 > SW > Null
   g_available_video_backends.push_back(std::make_unique<OGL::VideoBackend>());
 #ifdef _WIN32
   g_available_video_backends.push_back(std::make_unique<DX11::VideoBackend>());
@@ -48,6 +49,7 @@ void VideoBackendBase::PopulateList()
   }
 #endif
   g_available_video_backends.push_back(std::make_unique<SW::VideoSoftware>());
+  g_available_video_backends.push_back(std::make_unique<Null::VideoBackend>());
 
   const auto iter =
       std::find_if(g_available_video_backends.begin(), g_available_video_backends.end(),

Source/UnitTests/UnitTests.vcxproj

@@ -78,6 +78,9 @@
     <ProjectReference Include="$(CoreDir)VideoBackends\Software\Software.vcxproj">
       <Project>{a4c423aa-f57c-46c7-a172-d1a777017d29}</Project>
     </ProjectReference>
+    <ProjectReference Include="$(CoreDir)VideoBackends\Null\Null.vcxproj">
+      <Project>{53A5391B-737E-49A8-BC8F-312ADA00736F}</Project>
+    </ProjectReference>
     <ProjectReference Include="$(CoreDir)VideoBackends\D3D12\D3D12.vcxproj">
       <Project>{570215b7-e32f-4438-95ae-c8d955f9fca3}</Project>
     </ProjectReference>
@@ -108,4 +111,4 @@
     <!--This is only executed via msbuild, VS test runner automatically does this-->
     <Exec Command="$(TargetPath)" />
   </Target>
-</Project>
+</Project>

Source/dolphin-emu.sln

@@ -60,6 +60,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "OGL", "Core\VideoBackends\O
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Software", "Core\VideoBackends\Software\Software.vcxproj", "{A4C423AA-F57C-46C7-A172-D1A777017D29}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Null", "Core\VideoBackends\Null\Null.vcxproj", "{53A5391B-737E-49A8-BC8F-312ADA00736F}"
+EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Video Backends", "Video Backends", "{AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pch", "PCH\pch.vcxproj", "{76563A7F-1011-4EAD-B667-7BB18D09568E}"
@@ -187,6 +189,10 @@ Global
 		{A4C423AA-F57C-46C7-A172-D1A777017D29}.Debug|x64.Build.0 = Debug|x64
 		{A4C423AA-F57C-46C7-A172-D1A777017D29}.Release|x64.ActiveCfg = Release|x64
 		{A4C423AA-F57C-46C7-A172-D1A777017D29}.Release|x64.Build.0 = Release|x64
+                {53A5391B-737E-49A8-BC8F-312ADA00736F}.Debug|x64.ActiveCfg = Debug|x64
+                {53A5391B-737E-49A8-BC8F-312ADA00736F}.Debug|x64.Build.0 = Debug|x64
+                {53A5391B-737E-49A8-BC8F-312ADA00736F}.Release|x64.ActiveCfg = Release|x64
+                {53A5391B-737E-49A8-BC8F-312ADA00736F}.Release|x64.Build.0 = Release|x64
 		{76563A7F-1011-4EAD-B667-7BB18D09568E}.Debug|x64.ActiveCfg = Debug|x64
 		{76563A7F-1011-4EAD-B667-7BB18D09568E}.Debug|x64.Build.0 = Debug|x64
 		{76563A7F-1011-4EAD-B667-7BB18D09568E}.Release|x64.ActiveCfg = Release|x64
@@ -239,6 +245,7 @@ Global
 		{96020103-4BA5-4FD2-B4AA-5B6D24492D4E} = {AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4}
 		{EC1A314C-5588-4506-9C1E-2E58E5817F75} = {AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4}
 		{A4C423AA-F57C-46C7-A172-D1A777017D29} = {AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4}
+                {53A5391B-737E-49A8-BC8F-312ADA00736F} = {AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4}
 		{AAD1BCD6-9804-44A5-A5FC-4782EA00E9D4} = {15670B2E-CED6-4ED5-94CE-A00B1B2B5BA6}
 		{76563A7F-1011-4EAD-B667-7BB18D09568E} = {15670B2E-CED6-4ED5-94CE-A00B1B2B5BA6}
 		{CBC76802-C128-4B17-BF6C-23B08C313E5E} = {87ADDFF9-5768-4DA2-A33B-2477593D6677}