sceneconverter: test also behavior with ignored contents.

src/Magnum/SceneTools/Test/CMakeLists.txt

@@ -107,6 +107,7 @@ if(CORRADE_TARGET_UNIX AND NOT CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT)
             SceneConverterTestFiles/images-3d.gltf
             SceneConverterTestFiles/images-3d-1x1x1.bin
             SceneConverterTestFiles/images-3d-1x1x1.gltf
+            SceneConverterTestFiles/ignoring-unsupported.gltf
             SceneConverterTestFiles/info-data.txt
             SceneConverterTestFiles/info-data-ignored-output.txt
             SceneConverterTestFiles/info-converter.txt

src/Magnum/SceneTools/Test/SceneConverterTest.cpp

@@ -664,6 +664,33 @@ const struct {
         "Processing 3D image 1 with StbResizeImageConverter...\n"
         "Trade::AbstractSceneConverter::addImporterContents(): adding texture 0 out of 2\n"
         "Trade::AbstractSceneConverter::addImporterContents(): adding texture 1 out of 2\n"},
+    {"data unsupported by the converter", {InPlaceInit, {
+            "-I", "GltfImporter", "-i", "experimentalKhrTextureKtx",
+            "-C", "StanfordSceneConverter",
+            Utility::Path::join(SCENETOOLS_TEST_DIR, "SceneConverterTestFiles/ignoring-unsupported.gltf"),
+            Utility::Path::join(SCENETOOLS_TEST_OUTPUT_DIR, "SceneConverterTestFiles/quad.ply")
+        }},
+        "GltfImporter", "KtxImporter", "StanfordSceneConverter",
+        {"StbResizeImageConverter", nullptr}, nullptr,
+        "quad.ply", nullptr,
+        "Trade::AbstractSceneConverter::addSupportedImporterContents(): ignoring 1 2D images not supported by the converter\n"
+        "Trade::AbstractSceneConverter::addSupportedImporterContents(): ignoring 1 3D images not supported by the converter\n"
+        "Trade::AbstractSceneConverter::addSupportedImporterContents(): ignoring 2 textures not supported by the converter\n"},
+    {"per-image processed images unsupported by the converter", {InPlaceInit, {
+            "-I", "GltfImporter", "-i", "experimentalKhrTextureKtx",
+            "-P", "StbResizeImageConverter", "-p", "size=\"1 1\"",
+            "-C", "StanfordSceneConverter",
+            Utility::Path::join(SCENETOOLS_TEST_DIR, "SceneConverterTestFiles/ignoring-unsupported.gltf"),
+            Utility::Path::join(SCENETOOLS_TEST_OUTPUT_DIR, "SceneConverterTestFiles/quad.ply")
+        }},
+        "GltfImporter", "KtxImporter", "StanfordSceneConverter",
+        {"StbResizeImageConverter", nullptr}, nullptr,
+        "quad.ply", nullptr,
+        /* Compared to "data unsupported by the converter" these messages are
+           printed by sceneconverter itself, not the converter interface */
+        "Ignoring 1 2D images not supported by the converter\n"
+        "Ignoring 1 3D images not supported by the converter\n"
+        "Trade::AbstractSceneConverter::addSupportedImporterContents(): ignoring 2 textures not supported by the converter\n"},
 };
 
 const struct {

src/Magnum/SceneTools/Test/SceneConverterTestFiles/ignoring-unsupported.gltf

@@ -0,0 +1,77 @@
+{
+  "asset": {
+    "version": "2.0",
+    "note": "Contains one mesh equivalent to quad.ply and images etc that will cause warnings during conversion"
+  },
+  "extensionsUsed": [
+    "KHR_texture_ktx"
+  ],
+  "extensionsRequired": [
+    "KHR_texture_ktx"
+  ],
+  "buffers": [
+    {
+      "uri": "quad.bin",
+      "byteLength": 72
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteOffset": 0,
+      "byteLength": 24
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 24,
+      "byteLength": 48
+    }
+  ],
+  "accessors": [
+    {
+      "bufferView": 0,
+      "componentType": 5125,
+      "count": 6,
+      "type": "SCALAR"
+    },
+    {
+      "bufferView": 1,
+      "componentType": 5126,
+      "count": 4,
+      "type": "VEC3"
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "indices": 0,
+          "attributes": {
+            "POSITION": 1
+          }
+        }
+      ]
+    }
+  ],
+  "images": [
+    {
+      "uri": "red2x2.png"
+    },
+    {
+      "uri": "blue4x4x1.ktx2"
+    }
+  ],
+  "textures": [
+    {
+      "source": 0
+    },
+    {
+      "extensions": {
+        "KHR_texture_ktx": {
+          "source": 1,
+          "layer": 0
+        }
+      }
+    }
+  ]
+}

src/Magnum/SceneTools/sceneconverter.cpp

@@ -1067,6 +1067,8 @@ well, the IDs reference attributes of the first mesh.)")
            takes them from the importer instead */
         if(meshes) {
             if(!(Trade::sceneContentsFor(*converter) & Trade::SceneContent::Meshes)) {
+                /** @todo test this branch once there's a plugin that doesn't
+                    support meshes (URDF exporter, for example? glXF?) */
                 Warning{} << "Ignoring" << meshes.size() << "meshes not supported by the converter";
             } else for(UnsignedInt j = 0; j != meshes.size(); ++j) {
                 Trade::Implementation::Duration d{conversionTime};