Make cube primitive indexed.

Saves 300 bytes if using uncompressed vertex and normal data.

src/Primitives/Cube.cpp

@@ -19,91 +19,73 @@
 
 namespace Magnum { namespace Primitives {
 
-Cube::Cube(): MeshData3D("", Mesh::Primitive::Triangles, nullptr, {new std::vector<Point3D>{
+Cube::Cube(): MeshData3D("", Mesh::Primitive::Triangles, new std::vector<std::uint32_t>{
+     0,  1,  2,  0,  2,  3, /* +Z */
+     4,  5,  6,  4,  6,  7, /* +X */
+     8,  9, 10,  8, 10, 11, /* +Y */
+    12, 13, 14, 12, 14, 15, /* -Z */
+    16, 17, 18, 16, 18, 19, /* -Y */
+    20, 21, 22, 20, 22, 23  /* -X */
+}, {new std::vector<Point3D>{
     {-1.0f, -1.0f,  1.0f},
     { 1.0f, -1.0f,  1.0f},
     { 1.0f,  1.0f,  1.0f}, /* +Z */
-    {-1.0f, -1.0f,  1.0f},
-    { 1.0f,  1.0f,  1.0f},
     {-1.0f,  1.0f,  1.0f},
 
     { 1.0f, -1.0f,  1.0f},
     { 1.0f, -1.0f, -1.0f},
     { 1.0f,  1.0f, -1.0f}, /* +X */
-    { 1.0f, -1.0f,  1.0f},
-    { 1.0f,  1.0f, -1.0f},
     { 1.0f,  1.0f,  1.0f},
 
     {-1.0f,  1.0f,  1.0f},
     { 1.0f,  1.0f,  1.0f},
     { 1.0f,  1.0f, -1.0f}, /* +Y */
-    {-1.0f,  1.0f,  1.0f},
-    { 1.0f,  1.0f, -1.0f},
     {-1.0f,  1.0f, -1.0f},
 
     { 1.0f, -1.0f, -1.0f},
     {-1.0f, -1.0f, -1.0f},
     {-1.0f,  1.0f, -1.0f}, /* -Z */
-    { 1.0f, -1.0f, -1.0f},
-    {-1.0f,  1.0f, -1.0f},
     { 1.0f,  1.0f, -1.0f},
 
     {-1.0f, -1.0f, -1.0f},
     { 1.0f, -1.0f, -1.0f},
     { 1.0f, -1.0f,  1.0f}, /* -Y */
-    {-1.0f, -1.0f, -1.0f},
-    { 1.0f, -1.0f,  1.0f},
     {-1.0f, -1.0f,  1.0f},
 
     {-1.0f, -1.0f, -1.0f},
     {-1.0f, -1.0f,  1.0f},
     {-1.0f,  1.0f,  1.0f}, /* -X */
-    {-1.0f, -1.0f, -1.0f},
-    {-1.0f,  1.0f,  1.0f},
     {-1.0f,  1.0f, -1.0f}
 }}, {new std::vector<Vector3>{
     { 0.0f,  0.0f,  1.0f},
     { 0.0f,  0.0f,  1.0f},
     { 0.0f,  0.0f,  1.0f}, /* +Z */
     { 0.0f,  0.0f,  1.0f},
-    { 0.0f,  0.0f,  1.0f},
-    { 0.0f,  0.0f,  1.0f},
 
     { 1.0f,  0.0f,  0.0f},
     { 1.0f,  0.0f,  0.0f},
     { 1.0f,  0.0f,  0.0f}, /* +X */
     { 1.0f,  0.0f,  0.0f},
-    { 1.0f,  0.0f,  0.0f},
-    { 1.0f,  0.0f,  0.0f},
 
     { 0.0f,  1.0f,  0.0f},
     { 0.0f,  1.0f,  0.0f},
     { 0.0f,  1.0f,  0.0f}, /* +Y */
     { 0.0f,  1.0f,  0.0f},
-    { 0.0f,  1.0f,  0.0f},
-    { 0.0f,  1.0f,  0.0f},
 
     { 0.0f,  0.0f, -1.0f},
     { 0.0f,  0.0f, -1.0f},
     { 0.0f,  0.0f, -1.0f}, /* -Z */
     { 0.0f,  0.0f, -1.0f},
-    { 0.0f,  0.0f, -1.0f},
-    { 0.0f,  0.0f, -1.0f},
 
     { 0.0f, -1.0f,  0.0f},
     { 0.0f, -1.0f,  0.0f},
     { 0.0f, -1.0f,  0.0f}, /* -Y */
     { 0.0f, -1.0f,  0.0f},
-    { 0.0f, -1.0f,  0.0f},
-    { 0.0f, -1.0f,  0.0f},
 
     {-1.0f,  0.0f,  0.0f},
     {-1.0f,  0.0f,  0.0f},
     {-1.0f,  0.0f,  0.0f}, /* -X */
-    {-1.0f,  0.0f,  0.0f},
-    {-1.0f,  0.0f,  0.0f},
     {-1.0f,  0.0f,  0.0f}
-}}, {}) {
-}
+}}, {}) {}
 
 }}

src/Primitives/Cube.h

@@ -26,7 +26,7 @@ namespace Magnum { namespace Primitives {
 /**
 @brief 3D cube primitive
 
-2x2x2 cube. Non-indexed triangle mesh with flat normals.
+2x2x2 cube. Indexed triangle mesh with flat normals.
 */
 class Cube: public Trade::MeshData3D {
     public: