tr_image: do not rely on previously set data for cinematic, numberize and rename as $name

Author: illwieckz

src/engine/renderer/tr_image.cpp

@@ -2787,9 +2787,14 @@ void R_CreateBuiltinImages()
 	imageParams.bits = IF_NOPICMIP;
 	imageParams.wrapType = wrapTypeEnum_t::WT_CLAMP;
 
+	// Don't reuse previously set data, we test the values for selecting the upload format.
+	memset( data, 255, sizeof( data ) );
+
+	size_t numCinematicImages = 0;
 	for ( image_t * &image : tr.cinematicImage )
 	{
-		image = R_CreateImage( "_cinematic", ( const byte ** ) &dataPtr, 1, 1, 1, imageParams );
+		std::string name = Str::Format( "$cinematic%d", numCinematicImages++ );
+		image = R_CreateImage( name.c_str(), ( const byte ** ) &dataPtr, 1, 1, 1, imageParams );
 	}
 
 	R_CreateFogImage();