Fixed perspective matrix missing *2 term.

See e.g. http://www.songho.ca/opengl/gl_projectionmatrix.html Change-Id: I457fdb5bfd48bbb0e083e76ad090754b128eb421 Tested: on OS X.
google · May 27, 2015 · 4903ef1 · 4903ef1
1 parent 6df8772
commit 4903ef1
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diff --git a/include/mathfu/matrix.h b/include/mathfu/matrix.h
@@ -1273,7 +1273,7 @@ inline Matrix<T, 4, 4> PerspectiveHelper(T fovy, T aspect, T znear, T zfar,
   return Matrix<T, 4, 4>(x, 0, 0, 0,
                          0, y, 0, 0,
                          0, 0, zfar_per_zdist, -1 * handedness,
-                         0, 0, znear * zfar_per_zdist * handedness, 0);
+                         0, 0, 2.0f * znear * zfar_per_zdist * handedness, 0);
 }
 /// @endcond
 

diff --git a/unit_tests/matrix_test/matrix_test.cpp b/unit_tests/matrix_test/matrix_test.cpp
@@ -563,7 +563,7 @@ void Perspective_Test(const T& precision) {
       mathfu::Matrix<T, 4>(1, 0, 0, 0,
                            0, 1, 0, 0,
                            0, 0, -0.5, -1,
-                           0, 0, 1, 0),
+                           0, 0, 2, 0),
     },
   };
   VerifyMatrixExpectations(