AnyImage{Importer,Converter}: recognize OpenVDB file extension.

Volumetric data. No plugin directly in Magnum at the moment, right now
mainly to support depending projects.

src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp

@@ -186,6 +186,8 @@ bool AnyImageConverter::doConvertToFile(const ImageView3D& image, const Containe
         plugin = "OpenExrImageConverter"_s;
     else if(normalizedExtension == ".ktx2"_s)
         plugin = "KtxImageConverter"_s;
+    else if(normalizedExtension == ".vdb"_s)
+        plugin = "OpenVdbImageConverter"_s;
     else {
         Error{} << "Trade::AnyImageConverter::convertToFile(): cannot determine the format of" << filename << "for a 3D image";
         return false;

src/MagnumPlugins/AnyImageConverter/AnyImageConverter.h

@@ -76,6 +76,8 @@ tries to convert the file with it. Supported formats for uncompressed data:
 -   Truevision TGA (`*.tga`, `*.vda`, `*.icb`, `*.vst`), converted with
     @ref TgaImageConverter or any other plugin that provides it. Only
     uncompressed 2D images.
+-   OpenVDB (`*.vdb`), converted with any plugin that provides
+    `OpenVdbImageConverter`. Only uncompressed 3D images.
 
 As the converter plugin is picked based on file extension, only saving to files
 is supported.

src/MagnumPlugins/AnyImageConverter/Test/AnyImageConverterTest.cpp

@@ -171,6 +171,7 @@ constexpr struct {
     {"Basis Universal", "file.basis", "BasisImageConverter"},
     {"EXR", "file.exr", "OpenExrImageConverter"},
     {"KTX2", "file.ktx2", "KtxImageConverter"},
+    {"OpenVDB", "volume.vdb", "OpenVdbImageConverter"},
     /* Have at least one test case with uppercase */
     {"EXR uppercase", "FIL~1.EXR", "OpenExrImageConverter"}
 };

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp

@@ -125,6 +125,8 @@ void AnyImageImporter::doOpenFile(const Containers::StringView filename) {
             normalizedExtension == ".icb"_s ||
             normalizedExtension == ".vst"_s)
         plugin = "TgaImporter"_s;
+    else if(normalizedExtension == ".vdb"_s)
+        plugin = "OpenVdbImporter"_s;
     else {
         Error{} << "Trade::AnyImageImporter::openFile(): cannot determine the format of" << filename;
         return;

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.h

@@ -97,6 +97,7 @@ Supported formats:
 -   Truevision TGA (`*.tga`, `*.vda`, `*.icb`, `*.vst` or data with
     corresponding signature), loaded with @ref TgaImporter or any other plugin
     that provides it
+-   OpenVDB (`*.vdb`), loaded with any plugin that provides `OpenVdbImporter`
 
 Detecting file type through @ref openData() is supported only for a subset of
 formats that are marked as such in the list above.

src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp

@@ -122,7 +122,8 @@ constexpr struct {
     {"TIFF", "image.tiff", false, "TiffImporter"},
     {"TIFF data", "image.tiff", true, "TiffImporter"},
     {"Basis", "rgb.basis", false, "BasisImporter"},
-    {"Basis data", "rgb.basis", true, "BasisImporter"}
+    {"Basis data", "rgb.basis", true, "BasisImporter"},
+    {"OpenVDB", "volume.vdb", false, "OpenVdbImporter"}
     /* Not testing everything, just the most important ones */
 };