GL: construct simple Mesh and MeshView members in-class.

Better for maintenance, worse for header pollution.

src/Magnum/GL/Mesh.cpp

@@ -204,26 +204,11 @@ std::size_t Mesh::indexSize(Magnum::MeshIndexType type) {
 }
 #endif
 
-Mesh::Mesh(const MeshPrimitive primitive): _primitive{primitive}, _flags{ObjectFlag::DeleteOnDestruction}, _count{0}, _baseVertex{0}, _instanceCount{1},
-    #ifndef MAGNUM_TARGET_GLES
-    _baseInstance{0},
-    #endif
-    #ifndef MAGNUM_TARGET_GLES2
-    _indexStart(0), _indexEnd(0),
-    #endif
-    _indexOffset(0), _indexType(MeshIndexType::UnsignedInt), _indexBuffer(nullptr)
-{
+Mesh::Mesh(const MeshPrimitive primitive): _primitive{primitive}, _flags{ObjectFlag::DeleteOnDestruction} {
     (this->*Context::current().state().mesh->createImplementation)();
 }
 
-Mesh::Mesh(NoCreateT) noexcept: _id{0}, _primitive{MeshPrimitive::Triangles}, _flags{ObjectFlag::DeleteOnDestruction}, _count{0}, _baseVertex{0}, _instanceCount{1},
-    #ifndef MAGNUM_TARGET_GLES
-    _baseInstance{0},
-    #endif
-    #ifndef MAGNUM_TARGET_GLES2
-    _indexStart(0), _indexEnd(0),
-    #endif
-    _indexOffset(0), _indexType(MeshIndexType::UnsignedInt), _indexBuffer(nullptr) {}
+Mesh::Mesh(NoCreateT) noexcept: _id{0}, _primitive{MeshPrimitive::Triangles}, _flags{ObjectFlag::DeleteOnDestruction} {}
 
 Mesh::~Mesh() {
     /* Moved out or not deleting on destruction, nothing to do */

src/Magnum/GL/Mesh.h

@@ -1031,19 +1031,20 @@ class MAGNUM_GL_EXPORT Mesh: public AbstractObject {
         #endif
         #endif
 
+        /* _id, _primitive, _flags set from constructors */
         GLuint _id;
         MeshPrimitive _primitive;
         ObjectFlags _flags;
-        Int _count, _baseVertex, _instanceCount;
+        Int _count{}, _baseVertex{}, _instanceCount{1};
         #ifndef MAGNUM_TARGET_GLES
-        UnsignedInt _baseInstance;
+        UnsignedInt _baseInstance{};
         #endif
         #ifndef MAGNUM_TARGET_GLES2
-        UnsignedInt _indexStart, _indexEnd;
+        UnsignedInt _indexStart{}, _indexEnd{};
         #endif
-        GLintptr _indexOffset;
-        MeshIndexType _indexType;
-        Buffer* _indexBuffer;
+        GLintptr _indexOffset{};
+        MeshIndexType _indexType{};
+        Buffer* _indexBuffer{};
 
         /* Storage for std::vector with attribute layout / attribute buffer
            instances. 4 pointers should be one pointer more than enough. */

src/Magnum/GL/MeshView.h

@@ -286,25 +286,17 @@ class MAGNUM_GL_EXPORT MeshView {
 
         std::reference_wrapper<Mesh> _original;
 
-        Int _count, _baseVertex, _instanceCount;
+        Int _count{}, _baseVertex{}, _instanceCount{1};
         #ifndef MAGNUM_TARGET_GLES
-        UnsignedInt _baseInstance;
+        UnsignedInt _baseInstance{};
         #endif
-        GLintptr _indexOffset;
+        GLintptr _indexOffset{};
         #ifndef MAGNUM_TARGET_GLES2
-        UnsignedInt _indexStart, _indexEnd;
+        UnsignedInt _indexStart{}, _indexEnd{};
         #endif
 };
 
-inline MeshView::MeshView(Mesh& original): _original(original), _count(0), _baseVertex(0), _instanceCount{1},
-    #ifndef MAGNUM_TARGET_GLES
-    _baseInstance{0},
-    #endif
-    _indexOffset(0)
-    #ifndef MAGNUM_TARGET_GLES2
-    , _indexStart(0), _indexEnd(0)
-    #endif
-    {}
+inline MeshView::MeshView(Mesh& original): _original{original} {}
 
 inline MeshView& MeshView::setIndexRange(Int first, UnsignedInt start, UnsignedInt end) {
     setIndexRange(first);