Add DXVK-native (D3D9 on Vulkan) as an alternative to ToGL on Linux

.gitignore

@@ -37,3 +37,4 @@ waf3*/
 .vscode/
 .depproj/
 source-engine.sln
+dxvk-*/

.gitmodules

@@ -7,3 +7,8 @@
 [submodule "lib"]
 	path = lib
 	url = https://github.com/nillerusr/source-engine-libs.git
+[submodule "dxvk"]
+	path = dxvk
+	url = https://github.com/doitsujin/dxvk.git
+	update = none
+	ignore = untracked

appframework/sdlmgr.cpp

@@ -709,13 +709,15 @@ void CSDLMgr::Shutdown()
 {
 	SDLAPP_FUNC;
 
+#if defined( DX_TO_GL_ABSTRACTION )
 	if (gGL && m_readFBO)
 #ifdef TOGLES
 		gGL->glDeleteFramebuffers(1, &m_readFBO);
 #else
 		gGL->glDeleteFramebuffersEXT(1, &m_readFBO);
 #endif
 	m_readFBO = 0;
+#endif
 
 	if ( m_Window )
 	{
@@ -819,6 +821,9 @@ bool CSDLMgr::CreateHiddenGameWindow( const char *pTitle, int width, int height
 	int flags = SDL_WINDOW_HIDDEN;
 #if defined( DX_TO_GL_ABSTRACTION )
 	flags |= SDL_WINDOW_OPENGL;
+#elif defined( DXVK )
+	// DXVK-native creates its Vulkan surface on this window (SDL2 WSI); D3D9 presents to it
+	flags |= SDL_WINDOW_VULKAN;
 #endif
 	m_Window = SDL_CreateWindow( pTitle, x, y, width, height, flags );
 

bitmap/imageformat.cpp

@@ -7,6 +7,8 @@
 #if defined( _WIN32 ) && !defined( _X360 ) && !defined( DX_TO_GL_ABSTRACTION )
 #include <windows.h>
 #include "../dx9sdk/include/d3d9types.h"
+#elif defined( DXVK )
+#include "togl/dxvk_d3d9.h"
 #endif
 #include "bitmap/imageformat.h"
 #include "basetypes.h"

engine/sys_getmodes.cpp

@@ -17,6 +17,9 @@ typedef void *HDC;
 #endif
 
 #include "appframework/ilaunchermgr.h"
+#ifdef DXVK
+#include "togl/dxvk_d3d9.h" // Windows types (RECT, GUID, LONG, ...) from DXVK
+#endif
 
 #include "basetypes.h"
 #include "sysexternal.h"
@@ -1119,11 +1122,13 @@ void CVideoMode_Common::DrawNullBackground( void *hHDC, int w, int h )
 
 #ifndef _WIN32
 
+#ifndef DXVK // DXVK's windows_base.h has these
 typedef unsigned char BYTE;
 typedef signed long LONG;
 typedef unsigned long ULONG;
 
 typedef char * LPSTR;
+#endif
 
 typedef struct tagBITMAPINFOHEADER{
     DWORD      biSize;
@@ -1170,7 +1175,9 @@ typedef struct _GUID
 } GUID;
 
 #endif
+#ifndef DXVK
 typedef GUID UUID;
+#endif
 
 #endif //WIN32
 //-----------------------------------------------------------------------------

engine/sys_mainwind.cpp

@@ -1548,7 +1548,7 @@ void *CGame::GetMainWindow( void )
 
 void *CGame::GetMainDeviceWindow( void )
 {
-#if defined( DX_TO_GL_ABSTRACTION ) && defined( USE_SDL )
+#if ( defined( DX_TO_GL_ABSTRACTION ) || defined( DXVK ) ) && defined( USE_SDL )
 	return (void*)m_pSDLWindow;
 #else
 	return (void*)m_hWindow;