Fixed compile on systems involving XF86 video mode extension. ( propr…

…ietary driver )

Added extra debugging information pertaining to GLX extensions.
Added more documentation to OpenGL ES.
Fixed EGL initialization. Now the rendering api will properly initialize to OpenGL using EGL context.

neo/SConstruct

@@ -15,7 +15,7 @@ conf_filename='site.conf'
 serialized=['CC', 'CXX', 'JOBS', 'BUILD', 'IDNET_HOST', 'DEDICATED',
 	'DEBUG_MEMORY', 'LIBC_MALLOC', 'ID_NOLANADDRESS', 'ID_MCHECK', 'ALSA',
 	'TARGET_CORE', 'TARGET_GAME', 'TARGET_D3XP', 'TARGET_MONO', 'TARGET_DEMO', 'NOCURL',
-	'BUILD_ROOT', 'BUILD_GAMEPAK', 'BASEFLAGS', 'SILENT', 'TARGET_OPENGL',
+	'BUILD_ROOT', 'BUILD_GAMEPAK', 'BASEFLAGS', 'SILENT', 'TARGET_OPENGL', 'TARGET_OPENGL_EGL',
 	'TARGET_ANDROID', 'NDK' ]
 
 # global build mode ------------------------------
@@ -95,7 +95,13 @@ TARGET_DEMO (default 0)
 TARGET_OPENGL (default 0)
 	Build an OpenGL renderer instead of OpenGL ES2.0.
 	GLSL shaders are compatible.
+	NOTE: This default Contexts to Enable OpenGL. For Linux, This is GLX.
 
+TARGET_OPENGL_EGL (default 0)
+	Build an OpenGL renderer instead of OpenGL ES2.0.
+	GLSL shaders are compatible.
+	NOTE: This use EGL contexts to activate OpenGL.
+	
 TARGET_ANDROID (default 0)
 	Build the Android version.
 
@@ -176,6 +182,7 @@ TARGET_D3XP = '1'
 TARGET_MONO = '0'
 TARGET_DEMO = '0'
 TARGET_OPENGL = '0'
+TARGET_OPENGL_EGL = '0'
 TARGET_ANDROID = '0'
 NDK = ''
 IDNET_HOST = ''

neo/sys/linux/glimp.cpp

@@ -335,10 +335,21 @@ int GLX_Init(glimpParms_t a)
 	int i;
 	const char *glstring;
 
+	common->Printf("Initializing GLX\n");
+
 	if (!GLimp_OpenDisplay()) {
 		return false;
 	}
 
+	glstring = glXQueryExtensionsString( dpy, GLX_VENDOR);
+	common->Printf("GLX_VENDOR: %s\n", (glstring)?glstring:"NULL");
+
+	glstring = glXQueryExtensionsString( dpy, GLX_VERSION);
+	common->Printf("GLX_VERSION: %s\n", (glstring)?glstring:"NULL");
+
+	glstring = glXQueryExtensionsString( dpy, GLX_EXTENSIONS);
+	common->Printf("GLX_EXTENSIONS: %s\n", (glstring)?glstring:"NULL");
+
 	common->Printf("Initializing OpenGL display\n");
 
 	root = RootWindow(dpy, scrnum);

neo/sys/scons/SConscript.core

@@ -264,7 +264,7 @@ if ( local_dedicated == 0 ):
 		sys_string += ' android/input.cpp'
 	else:
 		sys_string += ' linux/input.cpp'
-	if ( local_opengl == 0 ):
+	if ( local_opengl == 0 or local_opengl_egl == 1):
 		if g_os == 'Android':
 			sys_string += ' android/gles2.cpp'
 		else:
@@ -361,6 +361,8 @@ if ( local_dedicated == 0 ):
 		local_env.Append( LIBS = [ 'GL' ] )
 		if ( local_opengl_egl == 1 ):
 			local_env.Append( LIBS = [ 'EGL' ] )
+		else:
+			local_env.Append( LIBS = [ 'Xxf86vm' ] )
 
 source_list = core_list
 source_list += idlib_objects