Primitives: remove template crap around Icosphere.

Now it has API similar to all other primitives. This thing was long
overdue.

src/Primitives/Icosphere.cpp

@@ -25,10 +25,14 @@
 #include "Icosphere.h"
 
 #include "Math/Vector3.h"
+#include "Trade/MeshData3D.h"
+#include "MeshTools/Subdivide.h"
+#include "MeshTools/RemoveDuplicates.h"
 
 namespace Magnum { namespace Primitives {
 
-Icosphere<0>::Icosphere(): MeshData3D(Mesh::Primitive::Triangles, {
+Trade::MeshData3D Icosphere::solid(const UnsignedInt subdivisions) {
+    std::vector<UnsignedInt> indices{
         1, 2, 6,
         1, 7, 2,
         3, 4, 5,
@@ -49,7 +53,9 @@ Icosphere<0>::Icosphere(): MeshData3D(Mesh::Primitive::Triangles, {
         7, 1, 0,
         3, 9, 8,
         4, 8, 0
-}, {}, {{
+    };
+
+    std::vector<Vector3> vertices{
         {0.0f, -0.525731f, 0.850651f},
         {0.850651f, 0.0f, 0.525731f},
         {0.850651f, 0.0f, -0.525731f},
@@ -62,8 +68,15 @@ Icosphere<0>::Icosphere(): MeshData3D(Mesh::Primitive::Triangles, {
         {0.0f, -0.525731f, -0.850651f},
         {0.0f, 0.525731f, -0.850651f},
         {0.0f, 0.525731f, 0.850651f}
-}}, {}) {
-    positions(0).assign(normals(0).begin(), normals(0).end());
+    };
+
+    for(std::size_t i = 0; i != subdivisions; ++i)
+        MeshTools::subdivide(indices, vertices, [](const Vector3& a, const Vector3& b) {
+            return (a+b).normalized();
+        });
+
+    MeshTools::removeDuplicates(indices, vertices);
+    return Trade::MeshData3D(Mesh::Primitive::Triangles, std::move(indices), {vertices}, {std::move(vertices)}, {});
 }
 
 }}

src/Primitives/Icosphere.h

@@ -28,53 +28,26 @@
  * @brief Class Magnum::Primitives::Icosphere
  */
 
-#include "Math/Vector3.h"
-#include "MeshTools/RemoveDuplicates.h"
-#include "MeshTools/Subdivide.h"
-#include "Trade/MeshData3D.h"
+#include "Trade/Trade.h"
 
 #include "Primitives/magnumPrimitivesVisibility.h"
 
 namespace Magnum { namespace Primitives {
 
-/** @todoc Remove `ifndef` when Doxygen is sane again */
-#ifndef DOXYGEN_GENERATING_OUTPUT
-template<std::size_t subdivisions> class MAGNUM_PRIMITIVES_EXPORT Icosphere;
-#endif
-
 /**
-@brief 3D icosphere primitive with zero subdivisions
+@brief 3D icosphere primitive
 
-Indexed @ref Mesh::Primitive "Triangles" with normals.
+Sphere with radius `1`.
 */
-template<> class Icosphere<0>: public Trade::MeshData3D {
+class MAGNUM_PRIMITIVES_EXPORT Icosphere {
     public:
-        /** @brief Constructor */
-        explicit Icosphere();
-};
-
         /**
-@brief 3D icosphere primitive
-@tparam subdivisions     Number of subdivisions
-
-Indexed @ref Mesh::Primitive "Triangles" with normals.
+         * @brief Solid icosphere
+         * @param subdivisions      Number of subdivisions
+         *
+         * Indexed @ref Mesh::Primitive "Triangles" with normals.
          */
-#ifndef DOXYGEN_GENERATING_OUTPUT
-template<std::size_t subdivisions> class Icosphere: public Icosphere<0> {
-#else
-template<std::size_t subdivisions> class Icosphere {
-#endif
-    public:
-        /** @brief Constructor */
-        explicit Icosphere() {
-            for(std::size_t i = 0; i != subdivisions; ++i)
-                MeshTools::subdivide(indices(), normals(0), [](const Vector3& a, const Vector3& b) {
-                    return (a+b).normalized();
-                });
-
-            MeshTools::removeDuplicates(indices(), normals(0));
-            positions(0)->assign(normals(0)->begin(), normals(0)->end());
-        }
+        static Trade::MeshData3D solid(UnsignedInt subdivisions);
 };
 
 }}