Implement a simple benchmarking mode which logs FPS to a file

Very useful to compare performance between two builds, check the impact of
a configuration option, etc. FPS log is stored in User/Logs/fps.txt and is
reset each time you launch a game. Only enabled if you check the "Log FPS
to file" option in your graphics settings.

Could be improved a bit: currently logs only every 1s (so you can't really
see small variations), maybe output more infos to the fps.txt like
average/stddev (but Excel/Libreoffice/Google Docs can compute that easily
too).

Source/Core/DolphinWX/Src/VideoConfigDiag.cpp

@@ -98,6 +98,7 @@ wxString wireframe_desc = wxTRANSLATE("Render the scene as a wireframe.\n\nIf un
 wxString disable_fog_desc = wxTRANSLATE("Improves performance but causes glitches in most games which rely on proper fog emulation.\n\nIf unsure, leave this unchecked.");
 wxString disable_alphapass_desc = wxTRANSLATE("Skip the destination alpha pass used in many games for various graphical effects.\n\nIf unsure, leave this unchecked.");
 wxString show_fps_desc = wxTRANSLATE("Show the number of frames rendered per second as a measure of emulation speed.\n\nIf unsure, leave this unchecked.");
+wxString log_fps_to_file_desc = wxTRANSLATE("Log the number of frames rendered per second to User/Logs/fps.txt. Use this feature when you want to measure the performance of Dolphin.\n\nIf unsure, leave this unchecked."); 
 wxString show_input_display_desc = wxTRANSLATE("Display the inputs read by the emulator.\n\nIf unsure, leave this unchecked.");
 wxString show_stats_desc = wxTRANSLATE("Show various statistics.\n\nIf unsure, leave this unchecked.");
 wxString texfmt_desc = wxTRANSLATE("Modify textures to show the format they're encoded in. Needs an emulation reset in most cases.\n\nIf unsure, leave this unchecked.");
@@ -296,6 +297,7 @@ VideoConfigDiag::VideoConfigDiag(wxWindow* parent, const std::string &title, con
 	{
 	SettingCheckBox* render_to_main_cb;
 	szr_other->Add(CreateCheckBox(page_general, _("Show FPS"), wxGetTranslation(show_fps_desc), vconfig.bShowFPS));
+	szr_other->Add(CreateCheckBox(page_general, _("Log FPS to file"), wxGetTranslation(log_fps_to_file_desc), vconfig.bLogFPSToFile));
 	szr_other->Add(CreateCheckBox(page_general, _("Auto adjust Window Size"), wxGetTranslation(auto_window_size_desc), SConfig::GetInstance().m_LocalCoreStartupParameter.bRenderWindowAutoSize));
 	szr_other->Add(CreateCheckBox(page_general, _("Keep window on top"), wxGetTranslation(keep_window_on_top_desc), SConfig::GetInstance().m_LocalCoreStartupParameter.bKeepWindowOnTop));
 	szr_other->Add(CreateCheckBox(page_general, _("Hide Mouse Cursor"), wxGetTranslation(hide_mouse_cursor_desc), SConfig::GetInstance().m_LocalCoreStartupParameter.bHideCursor));

Source/Core/VideoCommon/CMakeLists.txt

@@ -6,6 +6,7 @@ set(SRCS	Src/BPFunctions.cpp
 			Src/DLCache.cpp
 			Src/Debugger.cpp
 			Src/Fifo.cpp
+			Src/FPSCounter.cpp
 			Src/FramebufferManagerBase.cpp
 			Src/HiresTextures.cpp
 			Src/ImageWrite.cpp

Source/Core/VideoCommon/Src/FPSCounter.cpp

@@ -0,0 +1,64 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#include "FPSCounter.h"
+#include "FileUtil.h"
+#include "Timer.h"
+#include "VideoConfig.h"
+
+#define FPS_REFRESH_INTERVAL 1000
+
+static unsigned int s_counter = 0;
+static unsigned int s_fps = 0;
+static unsigned int s_fps_last_counter = 0;
+static unsigned long s_last_update_time = 0;
+static File::IOFile s_bench_file;
+
+void InitFPSCounter()
+{
+	s_counter = s_fps_last_counter = 0;
+	s_fps = 0;
+	s_last_update_time = Common::Timer::GetTimeMs();
+
+	if (s_bench_file.IsOpen())
+		s_bench_file.Close();
+}
+
+static void LogFPSToFile(unsigned long val)
+{
+	if (!s_bench_file.IsOpen())
+		s_bench_file.Open(File::GetUserPath(D_LOGS_IDX) + "fps.txt", "w");
+
+	char buffer[256];
+	snprintf(buffer, 256, "%ld\n", val);
+	s_bench_file.WriteArray(buffer, strlen(buffer));
+}
+
+int UpdateFPSCounter()
+{
+	if (Common::Timer::GetTimeMs() - s_last_update_time >= FPS_REFRESH_INTERVAL)
+	{
+		s_last_update_time = Common::Timer::GetTimeMs();
+		s_fps = s_counter - s_fps_last_counter;
+		s_fps_last_counter = s_counter;
+		if (g_ActiveConfig.bLogFPSToFile)
+			LogFPSToFile(s_fps);
+	}
+
+	s_counter++;
+	return s_fps;
+}

Source/Core/VideoCommon/Src/FPSCounter.h

@@ -0,0 +1,28 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#ifndef _FPS_COUNTER_H_
+#define _FPS_COUNTER_H_
+
+// Initializes the FPS counter.
+void InitFPSCounter();
+
+// Called when a frame is rendered. Returns the value to be displayed on
+// screen as the FPS counter (updated every second).
+int UpdateFPSCounter();
+
+#endif // _FPS_COUNTER_H_

Source/Core/VideoCommon/Src/VideoConfig.cpp

@@ -59,6 +59,7 @@ void VideoConfig::Load(const char *ini_file)
 	iniFile.Get("Settings", "UseRealXFB", &bUseRealXFB, 0);
 	iniFile.Get("Settings", "SafeTextureCacheColorSamples", &iSafeTextureCache_ColorSamples,128);
 	iniFile.Get("Settings", "ShowFPS", &bShowFPS, false); // Settings
+	iniFile.Get("Settings", "LogFPSToFile", &bLogFPSToFile, false);
 	iniFile.Get("Settings", "ShowInputDisplay", &bShowInputDisplay, false);
 	iniFile.Get("Settings", "OverlayStats", &bOverlayStats, false);
 	iniFile.Get("Settings", "OverlayProjStats", &bOverlayProjStats, false);
@@ -186,6 +187,7 @@ void VideoConfig::Save(const char *ini_file)
 	iniFile.Set("Settings", "UseRealXFB", bUseRealXFB);
 	iniFile.Set("Settings", "SafeTextureCacheColorSamples", iSafeTextureCache_ColorSamples);
 	iniFile.Set("Settings", "ShowFPS", bShowFPS);
+	iniFile.Set("Settings", "LogFPSToFile", bLogFPSToFile);
 	iniFile.Set("Settings", "ShowInputDisplay", bShowInputDisplay);
 	iniFile.Set("Settings", "OverlayStats", bOverlayStats);
 	iniFile.Set("Settings", "OverlayProjStats", bOverlayProjStats);

Source/Core/VideoCommon/Src/VideoConfig.h

@@ -97,6 +97,7 @@ struct VideoConfig
 	bool bTexFmtOverlayEnable;
 	bool bTexFmtOverlayCenter;
 	bool bShowEFBCopyRegions;
+	bool bLogFPSToFile;
 	
 	// Render
 	bool bWireFrame;

Source/Core/VideoCommon/VideoCommon.vcxproj

@@ -183,6 +183,7 @@
     <ClCompile Include="Src\DLCache.cpp" />
     <ClCompile Include="Src\EmuWindow.cpp" />
     <ClCompile Include="Src\Fifo.cpp" />
+    <ClCompile Include="Src\FPSCounter.cpp" />
     <ClCompile Include="Src\FramebufferManagerBase.cpp" />
     <ClCompile Include="Src\HiresTextures.cpp" />
     <ClCompile Include="Src\ImageWrite.cpp" />
@@ -228,6 +229,7 @@
     <ClInclude Include="Src\DLCache.h" />
     <ClInclude Include="Src\EmuWindow.h" />
     <ClInclude Include="Src\Fifo.h" />
+    <ClInclude Include="Src\FPSCounter.h" />
     <ClInclude Include="Src\FramebufferManagerBase.h" />
     <ClInclude Include="Src\HiresTextures.h" />
     <ClInclude Include="Src\ImageWrite.h" />

Source/Core/VideoCommon/VideoCommon.vcxproj.filters

@@ -119,6 +119,9 @@
     <ClCompile Include="Src\LightingShaderGen.cpp">
       <Filter>Shader Generators</Filter>
     </ClCompile>
+    <ClCompile Include="Src\FPSCounter.cpp">
+      <Filter>Util</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Src\CommandProcessor.h" />
@@ -246,6 +249,9 @@
     <ClInclude Include="Src\LightingShaderGen.h">
       <Filter>Shader Generators</Filter>
     </ClInclude>
+    <ClInclude Include="Src\FPSCounter.h">
+      <Filter>Util</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="CMakeLists.txt" />

Source/Plugins/Plugin_VideoDX11/Src/Render.cpp

@@ -44,6 +44,7 @@
 #include "Host.h"
 #include "BPFunctions.h"
 #include "AVIDump.h"
+#include "FPSCounter.h"
 
 namespace DX11
 {
@@ -338,6 +339,8 @@ Renderer::Renderer()
 	int x, y, w_temp, h_temp;
 	s_blendMode = 0;
 
+	InitFPSCounter();
+
 	Host_GetRenderWindowSize(x, y, w_temp, h_temp);
 
 	D3D::Create(EmuWindow::GetWnd());
@@ -1143,16 +1146,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 	}
 
 	// update FPS counter
-	static int fpscount = 0;
-	static unsigned long lasttime = 0;
-	if (Common::Timer::GetTimeMs() - lasttime >= 1000)
-	{
-		lasttime = Common::Timer::GetTimeMs();
-		s_fps = fpscount;
-		fpscount = 0;
-	}
 	if (XFBWrited)
-		++fpscount;
+		s_fps = UpdateFPSCounter();
 
 	// Begin new frame
 	// Set default viewport and scissor, for the clear to work correctly

Source/Plugins/Plugin_VideoDX9/Src/Render.cpp

@@ -54,6 +54,7 @@
 #include "Core.h"
 #include "Movie.h"
 #include "BPFunctions.h"
+#include "FPSCounter.h"
 
 namespace DX9
 {
@@ -247,6 +248,8 @@ void TeardownDeviceObjects()
 // Init functions
 Renderer::Renderer()
 {
+	InitFPSCounter();
+
 	st = new char[32768];
 
 	int fullScreenRes, x, y, w_temp, h_temp;
@@ -1107,7 +1110,7 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 
 	OSD::DrawMessages();
 	D3D::EndFrame();
-	frameCount++;
+	++frameCount;
 
 	GFX_DEBUGGER_PAUSE_AT(NEXT_FRAME, true);
 
@@ -1168,20 +1171,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 		D3D::dev->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,0), 1.0f, 0);
 	}
 
-	// Place messages on the picture, then copy it to the screen
-	// ---------------------------------------------------------------------
-	// Count FPS.
-	// -------------
-	static int fpscount = 0;
-	static unsigned long lasttime = 0;
-	if (Common::Timer::GetTimeMs() - lasttime >= 1000)
-	{
-		lasttime = Common::Timer::GetTimeMs();
-		s_fps = fpscount;
-		fpscount = 0;
-	}
 	if (XFBWrited)
-		++fpscount;
+		s_fps = UpdateFPSCounter();
 
 	// Begin new frame
 	// Set default viewport and scissor, for the clear to work correctly

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -61,6 +61,7 @@
 #include "Movie.h"
 #include "Host.h"
 #include "BPFunctions.h"
+#include "FPSCounter.h"
 
 #include "main.h" // Local
 #ifdef _WIN32
@@ -251,6 +252,8 @@ Renderer::Renderer()
 	s_fps=0;
 	s_blendMode = 0;
 
+	InitFPSCounter();
+
 #if defined HAVE_CG && HAVE_CG
 	g_cgcontext = cgCreateContext();
 	cgGetError();
@@ -1330,20 +1333,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 		}
 	}
 
-	// Place messages on the picture, then copy it to the screen
-	// ---------------------------------------------------------------------
-	// Count FPS.
-	// -------------
-	static int fpscount = 0;
-	static unsigned long lasttime = 0;
-	if (Common::Timer::GetTimeMs() - lasttime >= 1000)
-	{
-		lasttime = Common::Timer::GetTimeMs();
-		s_fps = fpscount;
-		fpscount = 0;
-	}
 	if (XFBWrited)
-		++fpscount;
+		s_fps = UpdateFPSCounter();
 	// ---------------------------------------------------------------------
 	GL_REPORT_ERRORD();