Add support for an aircraft specific splash screen

src/Main/main.cxx

@@ -1237,7 +1237,7 @@ static void fgIdleFunction ( void ) {
     if ( idle_state == 0 ) {
         // Initialize the splash screen right away
         if ( fgGetBool("/sim/startup/splash-screen") ) {
-            fgSplashInit();
+            fgSplashInit(fgGetString("/sim/startup/splash-texture"));
         }
         
         idle_state++;

src/Main/splash.cxx

@@ -52,20 +52,23 @@ static SGTexture splash;
 
 
 // Initialize the splash screen
-void fgSplashInit ( void ) {
+void fgSplashInit ( const char *splash_texture ) {
     SG_LOG( SG_GENERAL, SG_INFO, "Initializing splash screen" );
 
     splash.bind();
 
+    SGPath tpath( globals->get_fg_root() );
+    if (splash_texture == NULL) {
         // load in the texture data
         int num = (int)(sg_random() * 5.0 + 1.0);
         char num_str[256];
         sprintf(num_str, "%d", num);
 
-    SGPath tpath( globals->get_fg_root() );
         tpath.append( "Textures/Splash" );
         tpath.concat( num_str );
         tpath.concat( ".rgb" );
+    } else
+        tpath.append( splash_texture );
 
     splash.read_rgb_texture(tpath.c_str());
     if (!splash.usable())

src/Main/splash.hxx

@@ -32,7 +32,7 @@
 
 
 // Initialize the splash screen
-void fgSplashInit ( void );
+void fgSplashInit ( const char *splash_texture );
 
 // Update the splash screen with progress specified from 0.0 to 1.0
 void fgSplashUpdate ( double progress, float alpha );