Primitives: adding one extra vertex in solid circle primitive.

src/Magnum/Primitives/Circle.cpp

@@ -42,9 +42,10 @@ Trade::MeshData2D Circle::solid(UnsignedInt segments) {
     /* Central point */
     positions.emplace_back();
 
-    /* Points on circle */
+    /* Points on circle. The first/last point is here twice to close the circle
+       properly. */
     const Rad angleIncrement(Constants::tau()/segments);
-    for(UnsignedInt i = 0; i != segments; ++i) {
+    for(UnsignedInt i = 0; i != segments + 1; ++i) {
         const Rad angle(Float(i)*angleIncrement);
         positions.emplace_back(Math::cos(angle), Math::sin(angle));
     }

src/Magnum/Primitives/Test/CircleTest.cpp

@@ -51,7 +51,8 @@ void CircleTest::solid() {
         { 1.0f,  0.0f}, { Constants::sqrt2()/2.0f,  Constants::sqrt2()/2.0f},
         { 0.0f,  1.0f}, {-Constants::sqrt2()/2.0f,  Constants::sqrt2()/2.0f},
         {-1.0f,  0.0f}, {-Constants::sqrt2()/2.0f, -Constants::sqrt2()/2.0f},
-        { 0.0f, -1.0f}, { Constants::sqrt2()/2.0f, -Constants::sqrt2()/2.0f}
+        { 0.0f, -1.0f}, { Constants::sqrt2()/2.0f, -Constants::sqrt2()/2.0f},
+        { 1.0f,  0.0f}
     }));
 }