Warn when loading non-2D shaders before map

Since the necessity of sRGB conversions is not known.

Author: slipher

src/engine/client/cl_main.cpp

@@ -2143,7 +2143,7 @@ bool CL_InitRenderer()
 		FS_FCloseFile( f );
 	}
 
-	cls.whiteShader = re.RegisterShader( "white", RSF_NOMIP );
+	cls.whiteShader = re.RegisterShader( "white", RSF_NOMIP | RSF_2D );
 
 	g_console_field_width = cls.glconfig.vidWidth / SMALLCHAR_WIDTH - 2;
 	g_consoleField.SetWidth(g_console_field_width);

src/engine/client/client.h

@@ -315,7 +315,7 @@ struct clientStatic_t
 	glconfig_t  glconfig;
 	glconfig2_t glconfig2;
 	qhandle_t   charSetShader;
-	qhandle_t   whiteShader;
+	qhandle_t   whiteShader; // used for console drawing
 	bool    useLegacyConsoleFont;
 	bool    useLegacyConsoleFace;
 	fontInfo_t *consoleFont;

src/engine/renderer/tr_shader.cpp

@@ -6092,6 +6092,11 @@ shader_t       *R_FindShader( const char *name, int flags )
 	// going to have to upload an image
 	R_SyncRenderThread();
 
+	if ( !( flags & RSF_2D ) && !tr.worldMapLoaded )
+	{
+		Log::Warn( "non-2D shader '%s' registered before map colorspace is known, assuming naive blending", name );
+	}
+
 	ClearGlobalShader();
 
 	Q_strncpyz( shader.name, strippedName, sizeof( shader.name ) );