nullvideo: initial release of null video backend

Source/Core/Core/CMakeLists.txt

@@ -258,6 +258,7 @@ set(LIBS
 	vcdcom
 	vcddec
 	vcdenc
+	videonull
 	videoogl
 	videosoftware
 	z

Source/Core/VideoBackends/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_subdirectory(OGL)
+add_subdirectory(Null)
 add_subdirectory(Software)
 add_subdirectory(Vulkan)
 

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/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;
+}