Trade: direct access to MeshAttributeData array in MeshData.

Again useful for MeshTools algos.

src/Magnum/Trade/MeshData.h

@@ -611,6 +611,18 @@ class MAGNUM_TRADE_EXPORT MeshData {
         /** @brief Taking a view to a r-value instance is not allowed */
         Containers::ArrayView<char> mutableIndexData() && = delete;
 
+        /**
+         * @brief Raw attribute metadata
+         *
+         * Useful mainly for passing particular attributes to @ref MeshTools
+         * algorithms, everything is otherwise exposed directly through various
+         * `attribute*()` getters. Returns @cpp nullptr @ce if the mesh has no
+         * attributes.
+         * @see @ref attributeCount(), @ref attributeName(),
+         *      @ref attributeFormat(), @ref attribute()
+         */
+        Containers::ArrayView<const MeshAttributeData> attributeData() const { return _attributes; }
+
         /**
          * @brief Raw vertex data
          *

src/Magnum/Trade/Test/MeshDataTest.cpp

@@ -489,6 +489,7 @@ void MeshDataTest::construct() {
     CORRADE_COMPARE(data.indexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.vertexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.primitive(), MeshPrimitive::Triangles);
+    CORRADE_VERIFY(!data.attributeData().empty());
     CORRADE_COMPARE(static_cast<const void*>(data.indexData()), indexView.data());
     CORRADE_COMPARE(static_cast<const void*>(data.vertexData()), vertexView.data());
     CORRADE_COMPARE(static_cast<void*>(data.mutableIndexData()), indexView.data());
@@ -684,6 +685,7 @@ void MeshDataTest::constructAttributeless() {
     CORRADE_COMPARE(data.indexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.vertexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.primitive(), MeshPrimitive::TriangleStrip);
+    CORRADE_VERIFY(!data.attributeData());
     CORRADE_COMPARE(data.vertexData(), nullptr);
     CORRADE_COMPARE(data.importerState(), &importerState);
 
@@ -879,6 +881,7 @@ void MeshDataTest::constructAttributelessNotOwned() {
     CORRADE_COMPARE(data.indexDataFlags(), instanceData.dataFlags);
     CORRADE_COMPARE(data.vertexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.primitive(), MeshPrimitive::TriangleStrip);
+    CORRADE_VERIFY(!data.attributeData());
     CORRADE_COMPARE(data.vertexData(), nullptr);
     if(instanceData.dataFlags & DataFlag::Mutable)
         CORRADE_COMPARE(data.mutableVertexData(), nullptr);
@@ -908,6 +911,7 @@ void MeshDataTest::constructIndexlessAttributeless() {
     CORRADE_COMPARE(data.indexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.vertexDataFlags(), DataFlag::Owned|DataFlag::Mutable);
     CORRADE_COMPARE(data.primitive(), MeshPrimitive::TriangleStrip);
+    CORRADE_VERIFY(!data.attributeData());
     CORRADE_COMPARE(data.indexData(), nullptr);
     CORRADE_COMPARE(data.vertexData(), nullptr);
     CORRADE_COMPARE(data.importerState(), &importerState);
@@ -921,6 +925,7 @@ void MeshDataTest::constructIndexlessAttributelessZeroVertices() {
     int importerState;
     MeshData data{MeshPrimitive::TriangleStrip, 0, &importerState};
     CORRADE_COMPARE(data.primitive(), MeshPrimitive::TriangleStrip);
+    CORRADE_VERIFY(!data.attributeData());
     CORRADE_COMPARE(data.indexData(), nullptr);
     CORRADE_COMPARE(data.vertexData(), nullptr);
     CORRADE_COMPARE(data.importerState(), &importerState);