Added borderless window functionality

This might become handy for users with multiple monitors,
	might resolve other issues aswell

src/engine/client/backend_sdl.cpp

@@ -427,6 +427,13 @@ int CGraphicsBackend_SDL_OpenGL::Init(const char *pName, int *Width, int *Height
 	if(pInfo->blit_hw) // ignore_convention
 		SdlFlags |= SDL_HWACCEL;
 
+	dbg_assert(!(Flags&IGraphicsBackend::INITFLAG_BORDERLESS)
+		|| !(Flags&IGraphicsBackend::INITFLAG_FULLSCREEN),
+		"only one of borderless and fullscreen may be activated at the same time");
+
+	if(Flags&IGraphicsBackend::INITFLAG_BORDERLESS)
+		SdlFlags |= SDL_NOFRAME;
+
 	if(Flags&IGraphicsBackend::INITFLAG_FULLSCREEN)
 		SdlFlags |= SDL_FULLSCREEN;
 

src/engine/client/graphics.cpp

@@ -801,7 +801,15 @@ int CGraphics_SDL::TryInit()
 	if(pInfo->blit_hw) // ignore_convention
 		Flags |= SDL_HWACCEL;
 
-	if(g_Config.m_GfxFullscreen)
+	if(g_Config.m_GfxBorderless && g_Config.m_GfxFullscreen)
+	{
+		dbg_msg("gfx", "both borderless and fullscreen activated, disabling borderless");
+		g_Config.m_GfxBorderless = 0;
+	}
+
+	if(g_Config.m_GfxBorderless)
+		Flags |= SDL_NOFRAME;
+	else if(g_Config.m_GfxFullscreen)
 		Flags |= SDL_FULLSCREEN;
 
 	// set gl attributes

src/engine/client/graphics_threaded.cpp

@@ -712,7 +712,14 @@ void CGraphics_Threaded::QuadsText(float x, float y, float Size, float r, float
 int CGraphics_Threaded::IssueInit()
 {
 	int Flags = 0;
-	if(g_Config.m_GfxFullscreen) Flags |= IGraphicsBackend::INITFLAG_FULLSCREEN;
+	if(g_Config.m_GfxBorderless && g_Config.m_GfxFullscreen)
+	{
+		dbg_msg("gfx", "both borderless and fullscreen activated, disabling borderless");
+		g_Config.m_GfxBorderless = 0;
+	}
+
+	if(g_Config.m_GfxBorderless) Flags |= IGraphicsBackend::INITFLAG_BORDERLESS;
+	else if(g_Config.m_GfxFullscreen) Flags |= IGraphicsBackend::INITFLAG_FULLSCREEN;
 	if(g_Config.m_GfxVsync) Flags |= IGraphicsBackend::INITFLAG_VSYNC;
 	if(g_Config.m_DbgResizable) Flags |= IGraphicsBackend::INITFLAG_RESIZABLE;
 

src/engine/client/graphics_threaded.h

@@ -300,6 +300,7 @@ public:
 		INITFLAG_FULLSCREEN = 1,
 		INITFLAG_VSYNC = 2,
 		INITFLAG_RESIZABLE = 4,
+		INITFLAG_BORDERLESS = 8,
 	};
 
 	virtual int Init(const char *pName, int *Width, int *Height, int FsaaSamples, int Flags) = 0;

src/engine/shared/config_variables.h

@@ -59,6 +59,7 @@ MACRO_CONFIG_INT(SndNonactiveMute, snd_nonactive_mute, 0, 0, 1, CFGFLAG_SAVE|CFG
 
 MACRO_CONFIG_INT(GfxScreenWidth, gfx_screen_width, 0, 0, 0, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Screen resolution width")
 MACRO_CONFIG_INT(GfxScreenHeight, gfx_screen_height, 0, 0, 0, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Screen resolution height")
+MACRO_CONFIG_INT(GfxBorderless, gfx_borderless, 0, 0, 1, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Borderless window (not to be used with fullscreen)")
 MACRO_CONFIG_INT(GfxFullscreen, gfx_fullscreen, 1, 0, 1, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Fullscreen")
 MACRO_CONFIG_INT(GfxAlphabits, gfx_alphabits, 0, 0, 0, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Alpha bits for framebuffer (fullscreen only)")
 MACRO_CONFIG_INT(GfxColorDepth, gfx_color_depth, 24, 16, 24, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Colors bits for framebuffer (fullscreen only)")

src/game/client/components/menus_settings.cpp

@@ -613,6 +613,7 @@ void CMenus::RenderSettingsGraphics(CUIRect MainView)
 	static int s_GfxScreenWidth = g_Config.m_GfxScreenWidth;
 	static int s_GfxScreenHeight = g_Config.m_GfxScreenHeight;
 	static int s_GfxColorDepth = g_Config.m_GfxColorDepth;
+	static int s_GfxBorderless = g_Config.m_GfxBorderless;
 	static int s_GfxFullscreen = g_Config.m_GfxFullscreen;
 	static int s_GfxVsync = g_Config.m_GfxVsync;
 	static int s_GfxFsaaSamples = g_Config.m_GfxFsaaSamples;
@@ -667,10 +668,21 @@ void CMenus::RenderSettingsGraphics(CUIRect MainView)
 	}
 
 	// switches
+	MainView.HSplitTop(20.0f, &Button, &MainView);
+	if(DoButton_CheckBox(&g_Config.m_GfxBorderless, Localize("Borderless window"), g_Config.m_GfxBorderless, &Button))
+	{
+		g_Config.m_GfxBorderless ^= 1;
+		if(g_Config.m_GfxBorderless && g_Config.m_GfxFullscreen)
+			g_Config.m_GfxFullscreen = 0;
+		CheckSettings = true;
+	}
+
 	MainView.HSplitTop(20.0f, &Button, &MainView);
 	if(DoButton_CheckBox(&g_Config.m_GfxFullscreen, Localize("Fullscreen"), g_Config.m_GfxFullscreen, &Button))
 	{
 		g_Config.m_GfxFullscreen ^= 1;
+		if(g_Config.m_GfxFullscreen && g_Config.m_GfxBorderless)
+			g_Config.m_GfxBorderless = 0;
 		CheckSettings = true;
 	}
 
@@ -713,6 +725,7 @@ void CMenus::RenderSettingsGraphics(CUIRect MainView)
 		if(s_GfxScreenWidth == g_Config.m_GfxScreenWidth &&
 			s_GfxScreenHeight == g_Config.m_GfxScreenHeight &&
 			s_GfxColorDepth == g_Config.m_GfxColorDepth &&
+			s_GfxBorderless == g_Config.m_GfxBorderless &&
 			s_GfxFullscreen == g_Config.m_GfxFullscreen &&
 			s_GfxVsync == g_Config.m_GfxVsync &&
 			s_GfxFsaaSamples == g_Config.m_GfxFsaaSamples &&