- make OpenAL and the decoder libraries delay loaded so that ZDoom can still start without them being present.

This required the addition of a few exception handlers so to avoid #ifdef overuse I also added some #defines for non-Windows systems that allow using __try and __except directly in the code without #ifdef'ing them out.

src/CMakeLists.txt

@@ -1200,9 +1200,9 @@ endif( NOT ZDOOM_OUTPUT_OLDSTYLE OR NO_GENERATOR_EXPRESSIONS )
 if( MSVC )
 	option( ZDOOM_GENERATE_MAPFILE "Generate .map file for debugging." OFF )
 	if( ZDOOM_GENERATE_MAPFILE )
-		set_target_properties(zdoom PROPERTIES LINK_FLAGS "/MANIFEST:NO /DELAYLOAD:\"fmodex${X64}.dll\" /MAP")
+		set_target_properties(zdoom PROPERTIES LINK_FLAGS "/MANIFEST:NO /DELAYLOAD:\"fmodex${X64}.dll\" /DELAYLOAD:\"openal32.dll\" /DELAYLOAD:\"libmpg123-0.dll\" /DELAYLOAD:\"libsndfile-1.dll\" /MAP")
 	else( ZDOOM_GENERATE_MAPFILE )
-		set_target_properties(zdoom PROPERTIES LINK_FLAGS "/MANIFEST:NO /DELAYLOAD:\"fmodex${X64}.dll\"")
+		set_target_properties(zdoom PROPERTIES LINK_FLAGS "/MANIFEST:NO /DELAYLOAD:\"fmodex${X64}.dll\" /DELAYLOAD:\"openal32.dll\" /DELAYLOAD:\"libmpg123-0.dll\" /DELAYLOAD:\"libsndfile-1.dll\"")
 	endif( ZDOOM_GENERATE_MAPFILE )
 
 	add_custom_command(TARGET zdoom POST_BUILD

src/sound/except.h

@@ -0,0 +1,34 @@
+#ifndef __EXCEPT_H
+#define __EXCEPT_H
+
+#ifdef _MSC_VER
+//==========================================================================
+//
+// CheckException
+//
+//==========================================================================
+
+#ifndef FACILITY_VISUALCPP
+#define FACILITY_VISUALCPP  ((LONG)0x6d)
+#endif
+#define VcppException(sev,err)  ((sev) | (FACILITY_VISUALCPP<<16) | err)
+
+inline int CheckException(DWORD code)
+{
+	if (code == VcppException(ERROR_SEVERITY_ERROR,ERROR_MOD_NOT_FOUND) ||
+		code == VcppException(ERROR_SEVERITY_ERROR,ERROR_PROC_NOT_FOUND))
+	{
+		return EXCEPTION_EXECUTE_HANDLER;
+	}
+	return EXCEPTION_CONTINUE_SEARCH;
+}
+
+
+#else
+
+#define __try
+#define __except(a) if (0)
+
+#endif
+
+#endif

src/sound/fmodsound.cpp

@@ -52,6 +52,7 @@ extern HWND Window;
 #include <malloc.h>
 #endif
 
+#include "except.h"
 #include "templates.h"
 #include "fmodsound.h"
 #include "c_cvars.h"
@@ -629,30 +630,6 @@ bool FMODSoundRenderer::IsValid()
 	return InitSuccess;
 }
 
-#ifdef _MSC_VER
-//==========================================================================
-//
-// CheckException
-//
-//==========================================================================
-
-#ifndef FACILITY_VISUALCPP
-#define FACILITY_VISUALCPP  ((LONG)0x6d)
-#endif
-#define VcppException(sev,err)  ((sev) | (FACILITY_VISUALCPP<<16) | err)
-
-static int CheckException(DWORD code)
-{
-	if (code == VcppException(ERROR_SEVERITY_ERROR,ERROR_MOD_NOT_FOUND) ||
-		code == VcppException(ERROR_SEVERITY_ERROR,ERROR_PROC_NOT_FOUND))
-	{
-		return EXCEPTION_EXECUTE_HANDLER;
-	}
-	return EXCEPTION_CONTINUE_SEARCH;
-}
-
-#endif
-
 //==========================================================================
 //
 // FMODSoundRenderer :: Init
@@ -690,12 +667,12 @@ bool FMODSoundRenderer::Init()
 
 	Printf("I_InitSound: Initializing FMOD\n");
 
+	HMODULE a = GetModuleHandle("fmodex.dll");
+
 	// Create a System object and initialize.
-#ifdef _MSC_VER
-	__try {
-#endif
+	__try 
+	{
 		result = FMOD::System_Create(&Sys);
-#ifdef _MSC_VER
 	}
 	__except(CheckException(GetExceptionCode()))
 	{
@@ -707,7 +684,6 @@ bool FMODSoundRenderer::Init()
 			".dll\n");
 		return false;
 	}
-#endif
 	if (result != FMOD_OK)
 	{
 		Sys = NULL;

src/sound/i_sound.cpp

@@ -53,6 +53,7 @@ extern HINSTANCE g_hInst;
 #include "doomtype.h"
 #include <math.h>
 
+#include "except.h"
 #include "fmodsound.h"
 #include "oalsound.h"
 

src/sound/mpg123_decoder.cpp

@@ -1,3 +1,10 @@
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#define USE_WINDOWS_DWORD
+#endif
+#include "except.h"
+
 #include "mpg123_decoder.h"
 #include "files.h"
 
@@ -48,11 +55,19 @@ MPG123Decoder::~MPG123Decoder()
 bool MPG123Decoder::open(FileReader *reader)
 {
     if(!inited)
+    {
+		__try
 		{
 			if(mpg123_init() != MPG123_OK)
 				return false;
 			inited = true;
 		}
+		__except (CheckException(GetExceptionCode()))
+		{
+			// this means that the delay loaded decoder DLL was not found.
+			return false;
+		}
+    }
 
     Reader = reader;
     StartOffset = 0;

src/sound/oalsound.cpp

@@ -38,6 +38,7 @@
 #define USE_WINDOWS_DWORD
 #endif
 
+#include "except.h"
 #include "doomstat.h"
 #include "templates.h"
 #include "oalsound.h"
@@ -65,6 +66,8 @@ void I_BuildALDeviceList(FOptionValues *opt)
     opt->mValues[0].Text = "Default";
 
 #ifndef NO_OPENAL
+	__try
+	{
 		const ALCchar *names = (alcIsExtensionPresent(NULL, "ALC_ENUMERATE_ALL_EXT") ?
 			alcGetString(NULL, ALC_ALL_DEVICES_SPECIFIER) :
 			alcGetString(NULL, ALC_DEVICE_SPECIFIER));
@@ -78,6 +81,10 @@ void I_BuildALDeviceList(FOptionValues *opt)
 
 			names += strlen(names) + 1;
 		}
+	}
+	__except (CheckException(GetExceptionCode()))
+	{
+	}
 #endif
 }
 
@@ -588,6 +595,34 @@ static float GetRolloff(const FRolloffInfo *rolloff, float distance)
     return (powf(10.f, volume) - 1.f) / 9.f;
 }
 
+ALCdevice *OpenALSoundRenderer::InitDevice()
+{
+	ALCdevice *device = NULL;
+	__try
+	{
+		if(strcmp(snd_aldevice, "Default") != 0)
+		{
+			device = alcOpenDevice(*snd_aldevice);
+			if(!device)
+				Printf(TEXTCOLOR_BLUE" Failed to open device "TEXTCOLOR_BOLD"%s"TEXTCOLOR_BLUE". Trying default.\n", *snd_aldevice);
+		}
+
+		if(!device)
+		{
+			device = alcOpenDevice(NULL);
+			if(!device)
+			{
+				Printf(TEXTCOLOR_RED" Could not open audio device\n");
+			}
+		}
+	}
+	__except(CheckException(GetExceptionCode()))
+	{
+		Printf(TEXTCOLOR_ORANGE"Failed to load openal32.dll\n");
+	}
+	return device;
+}
+
 
 template<typename T>
 static void LoadALFunc(const char *name, T *x)
@@ -601,22 +636,8 @@ OpenALSoundRenderer::OpenALSoundRenderer()
 
     Printf("I_InitSound: Initializing OpenAL\n");
 
-    if(strcmp(snd_aldevice, "Default") != 0)
-    {
-        Device = alcOpenDevice(*snd_aldevice);
-        if(!Device)
-            Printf(TEXTCOLOR_BLUE" Failed to open device "TEXTCOLOR_BOLD"%s"TEXTCOLOR_BLUE". Trying default.\n", *snd_aldevice);
-    }
-
-    if(!Device)
-    {
-        Device = alcOpenDevice(NULL);
-        if(!Device)
-        {
-            Printf(TEXTCOLOR_RED" Could not open audio device\n");
-            return;
-        }
-    }
+	Device = InitDevice();
+	if (Device == NULL) return;
 
     const ALCchar *current = NULL;
     if(alcIsExtensionPresent(Device, "ALC_ENUMERATE_ALL_EXT"))

src/sound/oalsound.h

@@ -206,6 +206,8 @@ private:
 
     TArray<OpenALSoundStream*> Streams;
     friend class OpenALSoundStream;
+
+	ALCdevice *InitDevice();
 };
 
 #endif // NO_OPENAL

src/sound/sndfile_decoder.cpp

@@ -1,3 +1,10 @@
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#define USE_WINDOWS_DWORD
+#endif
+#include "except.h"
+
 #include "sndfile_decoder.h"
 #include "files.h"
 
@@ -46,6 +53,8 @@ SndFileDecoder::~SndFileDecoder()
 }
 
 bool SndFileDecoder::open(FileReader *reader)
+{
+	__try
 	{
 		SF_VIRTUAL_IO sfio = { file_get_filelen, file_seek, file_read, file_write, file_tell };
 
@@ -59,7 +68,11 @@ bool SndFileDecoder::open(FileReader *reader)
 			sf_close(SndFile);
 			SndFile = 0;
 		}
-
+	}
+	__except (CheckException(GetExceptionCode()))
+	{
+		// this means that the delay loaded decoder DLL was not found.
+	}
     return false;
 }