SceneGraph: Test for Implementation::Camera<3>::fixAspectRatio().

src/SceneGraph/Camera.h

@@ -137,12 +137,14 @@ template<class MatrixType, class VectorType, class ObjectType, class SceneType,
         Math::Vector2<GLsizei> _viewport;
 };
 
+/** @todo Export implementation symbols only for tests */
+
 #ifndef DOXYGEN_GENERATING_OUTPUT
 /* These templates are instantiated in source file */
 extern template class SCENEGRAPH_EXPORT Camera<Matrix4, Vector3, Object3D, Scene3D, Camera3D>;
 
 namespace Implementation {
-    template<> class Camera<3> {
+    template<> class SCENEGRAPH_EXPORT Camera<3> {
         public:
             static Matrix4 fixAspectRatio(AspectRatioPolicy aspectRatioPolicy, const Math::Vector2<GLsizei>& viewport);
     };

src/SceneGraph/Test/CameraTest.cpp

@@ -22,10 +22,38 @@ CORRADE_TEST_MAIN(Magnum::SceneGraph::Test::CameraTest)
 namespace Magnum { namespace SceneGraph { namespace Test {
 
 CameraTest::CameraTest() {
-    addTests(&CameraTest::orthographic,
+    addTests(&CameraTest::fixAspectRatio,
+             &CameraTest::orthographic,
              &CameraTest::perspective);
 }
 
+void CameraTest::fixAspectRatio() {
+    /* Division by zero */
+    Math::Vector2<GLsizei> sizeZeroY(400, 0);
+    Math::Vector2<GLsizei> sizeZeroX(0, 300);
+    CORRADE_COMPARE(Implementation::Camera<3>::fixAspectRatio(Implementation::AspectRatioPolicy::Clip, sizeZeroY), Matrix4());
+    CORRADE_COMPARE(Implementation::Camera<3>::fixAspectRatio(Implementation::AspectRatioPolicy::Extend, sizeZeroX), Matrix4());
+
+    Math::Vector2<GLsizei> size(400, 300);
+
+    /* Not preserved */
+    CORRADE_COMPARE(Implementation::Camera<3>::fixAspectRatio(Implementation::AspectRatioPolicy::NotPreserved, size), Matrix4());
+
+    /* Clip */
+    Matrix4 expectedClip(1.0f, 0.0f,      0.0f, 0.0f,
+                         0.0f, 4.0f/3.0f, 0.0f, 0.0f,
+                         0.0f, 0.0f,      1.0f, 0.0f,
+                         0.0f, 0.0f,      0.0f, 1.0f);
+    CORRADE_COMPARE(Implementation::Camera<3>::fixAspectRatio(Implementation::AspectRatioPolicy::Clip, size), expectedClip);
+
+    /* Extend */
+    Matrix4 expectedExtend(3.0f/4.0f, 0.0f, 0.0f, 0.0f,
+                           0.0f,      1.0f, 0.0f, 0.0f,
+                           0.0f,      0.0f, 1.0f, 0.0f,
+                           0.0f,      0.0f, 0.0f, 1.0f);
+    CORRADE_COMPARE(Implementation::Camera<3>::fixAspectRatio(Implementation::AspectRatioPolicy::Extend, size), expectedExtend);
+}
+
 void CameraTest::orthographic() {
     Camera3D camera;
     camera.setOrthographic(5, 1, 9);

src/SceneGraph/Test/CameraTest.h

@@ -23,6 +23,7 @@ class CameraTest: public Corrade::TestSuite::Tester<CameraTest> {
     public:
         CameraTest();
 
+        void fixAspectRatio();
         void orthographic();
         void perspective();
 };