Implemented loading screen code from prey

neo/renderer/Image_load.cpp

@@ -1267,7 +1267,6 @@ If fullLoad is false, only the small mip levels of the image will be loaded
 ================
 */
 bool idImage::CheckPrecompressedImage( bool fullLoad ) {
-	return false;
 
 #if 1 // ( _D3XP had disabled ) - Allow grabbing of DDS's from original Doom pak files
 	// if we are doing a copyFiles, make sure the original images are referenced
@@ -1285,6 +1284,10 @@ bool idImage::CheckPrecompressedImage( bool fullLoad ) {
 		return false;
 	}
 
+	if (!renderSystem->IsOpenGLRunning()) {
+		return false;
+	}
+
 	char filename[MAX_IMAGE_NAME];
 	ImageProgramStringToCompressedFileName( imgName, filename );