Display deprecation warning when writing FFT compressed anim chans

panda/src/chan/animChannelMatrixXfmTable.cxx

@@ -327,10 +327,16 @@ void AnimChannelMatrixXfmTable::
 write_datagram(BamWriter *manager, Datagram &me) {
   AnimChannelMatrix::write_datagram(manager, me);
 
-  if (compress_channels && !FFTCompressor::is_compression_available()) {
-    chan_cat.error()
-      << "Compression is not available; writing uncompressed channels.\n";
-    compress_channels = false;
+  if (compress_channels) {
+    chan_cat.warning()
+      << "FFT compression of animations is deprecated.  For compatibility "
+         "with future versions of Panda3D, set compress-channels to false.\n";
+
+    if (!FFTCompressor::is_compression_available()) {
+      chan_cat.error()
+        << "Compression is not available; writing uncompressed channels.\n";
+      compress_channels = false;
+    }
   }
 
   me.add_bool(compress_channels);

panda/src/chan/animChannelScalarTable.cxx

@@ -146,10 +146,16 @@ void AnimChannelScalarTable::
 write_datagram(BamWriter *manager, Datagram &me) {
   AnimChannelScalar::write_datagram(manager, me);
 
-  if (compress_channels && !FFTCompressor::is_compression_available()) {
-    chan_cat.error()
-      << "Compression is not available; writing uncompressed channels.\n";
-    compress_channels = false;
+  if (compress_channels) {
+    chan_cat.warning()
+      << "FFT compression of animations is deprecated.  For compatibility "
+         "with future versions of Panda3D, set compress-channels to false.\n";
+
+    if (!FFTCompressor::is_compression_available()) {
+      chan_cat.error()
+        << "Compression is not available; writing uncompressed channels.\n";
+      compress_channels = false;
+    }
   }
 
   me.add_bool(compress_channels);